feat(server): add lazy simulation layer replacements

app.tsx now has a single simulation touchpoint inside the renderer
acquire: in simulation mode it delegates to Simulation.createSimulation,
which picks the fake or visible renderer and starts the control server.
The server is tied to renderer destroy, so no extra finalizer is needed
in app code.

.opencode/plugins/orchestrator.ts

@@ -0,0 +1,36 @@
+export default {
+  id: "Orchestrator",
+  setup: async (ctx) => {
+    await ctx.agent.transform((agents) => {
+      agents.update("orchestrator", (agent) => {
+        agent.description = "Coordinates work by delegating implementation tasks to the minion subagent."
+        agent.mode = "primary"
+        agent.system = [
+          "You are Orchestrator, the primary coordinating agent for this repository. You do meta work only: you coordinate, brief, and synthesize — you do not perform the work itself.",
+          "Delegate ALL actual work to the minion subagent — implementation, exploration, discovery, searching the codebase, reading files to understand a problem, and even trivial one-line edits. Task size is never a reason to do it yourself, and there is no 'final integration' exception.",
+          "You are not hard-banned from tools, but direct tool use is reserved for coordination overhead: a quick peek to phrase a better brief, a fast read-only check to verify a minion's reported result, or answering a question about coordination state. If a tool call is producing the answer or the artifact the user asked for, that call belongs to a minion, not you.",
+          "Exploration is work. If the user asks how something works or where something lives, delegate the investigation to a minion rather than exploring yourself.",
+          "Always start minion subagents in the background. Even if you have nothing else to coordinate right now, the user may assign you new work while a Minion runs, and you must stay free to receive it. Never poll; you will be notified when they finish.",
+          "Give each minion a clear, self-contained brief: the goal, constraints, expected output, and any files or context already known from the user or previous minion reports.",
+          "Synthesize minion results, decide next steps, and report back concisely.",
+        ].join("\n")
+      })
+
+      agents.update("minion", (agent) => {
+        agent.description = "Subagent that executes focused tasks delegated by Orchestrator."
+        agent.mode = "subagent"
+        agent.model = { providerID: "opencode", id: "glm-5.2" }
+        agent.system = [
+          "You are minion, a focused execution subagent for this repository.",
+          "Complete the specific task delegated to you by Orchestrator using the available tools.",
+          "Inspect the codebase before making assumptions, make targeted changes when requested, and verify your work when feasible.",
+          "Follow the repository's AGENTS.md conventions: respect the style guide, run `bun typecheck` from the affected package directory after code changes, never run tests from the repo root, and do not modify packages/opencode unless the task explicitly says V1 work.",
+          "If the task is ambiguous or you hit a blocker, stop and report your findings instead of guessing.",
+          "Keep your final response concise: summarize what you did, list important files changed or findings, and call out blockers or verification gaps.",
+          "Do not delegate to other subagents; execute the assigned work yourself.",
+        ].join("\n")
+        agent.permissions.push({ action: "subagent", resource: "*", effect: "deny" })
+      })
+    })
+  },
+}

.opencode/plugins/sample-agent.ts

@@ -1,16 +0,0 @@
-export default {
-  id: "sample-agent-plugin",
-  setup: async (ctx) => {
-    await ctx.agent.transform((agents) => {
-      agents.update("sample-plugin-agent", (agent) => {
-        agent.description = "Example primary agent registered by .opencode/plugins/sample-agent.ts"
-        agent.mode = "primary"
-        agent.system = [
-          "You are the sample plugin agent for this repository.",
-          "Use this agent to verify that local plugin auto-discovery can add agents.",
-          "Keep responses concise and explain which plugin registered you when asked.",
-        ].join("\n")
-      })
-    })
-  },
-}

AGENTS.md

@@ -159,4 +159,5 @@ const table = sqliteTable("session", {
 - Keep local Session drains process-local until clustering is implemented. `SessionRunCoordinator` joins explicit same-Session resumes, coalesces prompt wakeups, and allows different Sessions to run concurrently. Advisory wakes drain eligible durable inbox rows only; post-crash continuation recovery requires a separate explicit design before it may retry provider work. A drain has no durable identity or transcript boundary.
 - Keep delivery vocabulary explicit. Prompts steer by default and promote at the next safe provider-turn boundary while the current drain requires continuation. An explicit `queue` input remains pending until the Session would otherwise become idle; promote one queued input at that boundary, then reevaluate continuation before promoting another. Promoting any new user input resets the selected agent's provider-turn allowance; a batch of steers resets it once.
 - Keep EventV2 replay owner claims separate from clustered Session execution ownership.
-- Keep the System Context algebra, registry, and built-ins in `src/system-context`; keep Context Source producers with their observed domains, and keep Session History selection plus Context Epoch persistence Session-owned.
+- Keep the System Context algebra and built-ins in `src/system-context`; keep Context Source producers with their observed domains, and keep Session History selection plus Context Checkpoint persistence Session-owned. The runner composes all context producers explicitly in `loadSystemContext`; there is no context registry.
+- The durable Applied record is what the model was last told, per source. Reconcile narrates drift as chronological System updates and never rewrites the baseline; only completed compaction rebaselines, and move or committed revert resets the checkpoint. Unavailable sources keep the model's prior belief, blocking only a session's first baseline.

packages/client/src/generated-effect/client.ts

@@ -164,23 +164,36 @@ const Endpoint4_9 = (raw: RawClient["server.session"]) => (input: Endpoint4_9Inp
     payload: { id: input["id"], skill: input["skill"], resume: input["resume"] },
   }).pipe(Effect.mapError(mapClientError))
 
-type Endpoint4_10Request = Parameters<RawClient["server.session"]["session.compact"]>[0]
-type Endpoint4_10Input = { readonly sessionID: Endpoint4_10Request["params"]["sessionID"] }
+type Endpoint4_10Request = Parameters<RawClient["server.session"]["session.synthetic"]>[0]
+type Endpoint4_10Input = {
+  readonly sessionID: Endpoint4_10Request["params"]["sessionID"]
+  readonly text: Endpoint4_10Request["payload"]["text"]
+  readonly description?: Endpoint4_10Request["payload"]["description"]
+  readonly metadata?: Endpoint4_10Request["payload"]["metadata"]
+}
 const Endpoint4_10 = (raw: RawClient["server.session"]) => (input: Endpoint4_10Input) =>
-  raw["session.compact"]({ params: { sessionID: input["sessionID"] } }).pipe(Effect.mapError(mapClientError))
+  raw["session.synthetic"]({
+    params: { sessionID: input["sessionID"] },
+    payload: { text: input["text"], description: input["description"], metadata: input["metadata"] },
+  }).pipe(Effect.mapError(mapClientError))
 
-type Endpoint4_11Request = Parameters<RawClient["server.session"]["session.wait"]>[0]
+type Endpoint4_11Request = Parameters<RawClient["server.session"]["session.compact"]>[0]
 type Endpoint4_11Input = { readonly sessionID: Endpoint4_11Request["params"]["sessionID"] }
 const Endpoint4_11 = (raw: RawClient["server.session"]) => (input: Endpoint4_11Input) =>
+  raw["session.compact"]({ params: { sessionID: input["sessionID"] } }).pipe(Effect.mapError(mapClientError))
+
+type Endpoint4_12Request = Parameters<RawClient["server.session"]["session.wait"]>[0]
+type Endpoint4_12Input = { readonly sessionID: Endpoint4_12Request["params"]["sessionID"] }
+const Endpoint4_12 = (raw: RawClient["server.session"]) => (input: Endpoint4_12Input) =>
   raw["session.wait"]({ params: { sessionID: input["sessionID"] } }).pipe(Effect.mapError(mapClientError))
 
-type Endpoint4_12Request = Parameters<RawClient["server.session"]["session.revert.stage"]>[0]
-type Endpoint4_12Input = {
-  readonly sessionID: Endpoint4_12Request["params"]["sessionID"]
-  readonly messageID: Endpoint4_12Request["payload"]["messageID"]
-  readonly files?: Endpoint4_12Request["payload"]["files"]
+type Endpoint4_13Request = Parameters<RawClient["server.session"]["session.revert.stage"]>[0]
+type Endpoint4_13Input = {
+  readonly sessionID: Endpoint4_13Request["params"]["sessionID"]
+  readonly messageID: Endpoint4_13Request["payload"]["messageID"]
+  readonly files?: Endpoint4_13Request["payload"]["files"]
 }
-const Endpoint4_12 = (raw: RawClient["server.session"]) => (input: Endpoint4_12Input) =>
+const Endpoint4_13 = (raw: RawClient["server.session"]) => (input: Endpoint4_13Input) =>
   raw["session.revert.stage"]({
     params: { sessionID: input["sessionID"] },
     payload: { messageID: input["messageID"], files: input["files"] },
@@ -189,42 +202,72 @@ const Endpoint4_12 = (raw: RawClient["server.session"]) => (input: Endpoint4_12I
     Effect.map((value) => value.data),
   )
 
-type Endpoint4_13Request = Parameters<RawClient["server.session"]["session.revert.clear"]>[0]
-type Endpoint4_13Input = { readonly sessionID: Endpoint4_13Request["params"]["sessionID"] }
-const Endpoint4_13 = (raw: RawClient["server.session"]) => (input: Endpoint4_13Input) =>
-  raw["session.revert.clear"]({ params: { sessionID: input["sessionID"] } }).pipe(Effect.mapError(mapClientError))
-
-type Endpoint4_14Request = Parameters<RawClient["server.session"]["session.revert.commit"]>[0]
+type Endpoint4_14Request = Parameters<RawClient["server.session"]["session.revert.clear"]>[0]
 type Endpoint4_14Input = { readonly sessionID: Endpoint4_14Request["params"]["sessionID"] }
 const Endpoint4_14 = (raw: RawClient["server.session"]) => (input: Endpoint4_14Input) =>
-  raw["session.revert.commit"]({ params: { sessionID: input["sessionID"] } }).pipe(Effect.mapError(mapClientError))
+  raw["session.revert.clear"]({ params: { sessionID: input["sessionID"] } }).pipe(Effect.mapError(mapClientError))
 
-type Endpoint4_15Request = Parameters<RawClient["server.session"]["session.context"]>[0]
+type Endpoint4_15Request = Parameters<RawClient["server.session"]["session.revert.commit"]>[0]
 type Endpoint4_15Input = { readonly sessionID: Endpoint4_15Request["params"]["sessionID"] }
 const Endpoint4_15 = (raw: RawClient["server.session"]) => (input: Endpoint4_15Input) =>
+  raw["session.revert.commit"]({ params: { sessionID: input["sessionID"] } }).pipe(Effect.mapError(mapClientError))
+
+type Endpoint4_16Request = Parameters<RawClient["server.session"]["session.context"]>[0]
+type Endpoint4_16Input = { readonly sessionID: Endpoint4_16Request["params"]["sessionID"] }
+const Endpoint4_16 = (raw: RawClient["server.session"]) => (input: Endpoint4_16Input) =>
   raw["session.context"]({ params: { sessionID: input["sessionID"] } }).pipe(
     Effect.mapError(mapClientError),
     Effect.map((value) => value.data),
   )
 
-type Endpoint4_16Request = Parameters<RawClient["server.session"]["session.history"]>[0]
-type Endpoint4_16Input = {
-  readonly sessionID: Endpoint4_16Request["params"]["sessionID"]
-  readonly limit?: Endpoint4_16Request["query"]["limit"]
-  readonly after?: Endpoint4_16Request["query"]["after"]
+type Endpoint4_17Request = Parameters<RawClient["server.session"]["session.context.entry.list"]>[0]
+type Endpoint4_17Input = { readonly sessionID: Endpoint4_17Request["params"]["sessionID"] }
+const Endpoint4_17 = (raw: RawClient["server.session"]) => (input: Endpoint4_17Input) =>
+  raw["session.context.entry.list"]({ params: { sessionID: input["sessionID"] } }).pipe(
+    Effect.mapError(mapClientError),
+    Effect.map((value) => value.data),
+  )
+
+type Endpoint4_18Request = Parameters<RawClient["server.session"]["session.context.entry.put"]>[0]
+type Endpoint4_18Input = {
+  readonly sessionID: Endpoint4_18Request["params"]["sessionID"]
+  readonly key: Endpoint4_18Request["params"]["key"]
+  readonly value: Endpoint4_18Request["payload"]["value"]
 }
-const Endpoint4_16 = (raw: RawClient["server.session"]) => (input: Endpoint4_16Input) =>
+const Endpoint4_18 = (raw: RawClient["server.session"]) => (input: Endpoint4_18Input) =>
+  raw["session.context.entry.put"]({
+    params: { sessionID: input["sessionID"], key: input["key"] },
+    payload: { value: input["value"] },
+  }).pipe(Effect.mapError(mapClientError))
+
+type Endpoint4_19Request = Parameters<RawClient["server.session"]["session.context.entry.remove"]>[0]
+type Endpoint4_19Input = {
+  readonly sessionID: Endpoint4_19Request["params"]["sessionID"]
+  readonly key: Endpoint4_19Request["params"]["key"]
+}
+const Endpoint4_19 = (raw: RawClient["server.session"]) => (input: Endpoint4_19Input) =>
+  raw["session.context.entry.remove"]({ params: { sessionID: input["sessionID"], key: input["key"] } }).pipe(
+    Effect.mapError(mapClientError),
+  )
+
+type Endpoint4_20Request = Parameters<RawClient["server.session"]["session.history"]>[0]
+type Endpoint4_20Input = {
+  readonly sessionID: Endpoint4_20Request["params"]["sessionID"]
+  readonly limit?: Endpoint4_20Request["query"]["limit"]
+  readonly after?: Endpoint4_20Request["query"]["after"]
+}
+const Endpoint4_20 = (raw: RawClient["server.session"]) => (input: Endpoint4_20Input) =>
   raw["session.history"]({
     params: { sessionID: input["sessionID"] },
     query: { limit: input["limit"], after: input["after"] },
   }).pipe(Effect.mapError(mapClientError))
 
-type Endpoint4_17Request = Parameters<RawClient["server.session"]["session.events"]>[0]
-type Endpoint4_17Input = {
-  readonly sessionID: Endpoint4_17Request["params"]["sessionID"]
-  readonly after?: Endpoint4_17Request["query"]["after"]
+type Endpoint4_21Request = Parameters<RawClient["server.session"]["session.events"]>[0]
+type Endpoint4_21Input = {
+  readonly sessionID: Endpoint4_21Request["params"]["sessionID"]
+  readonly after?: Endpoint4_21Request["query"]["after"]
 }
-const Endpoint4_17 = (raw: RawClient["server.session"]) => (input: Endpoint4_17Input) =>
+const Endpoint4_21 = (raw: RawClient["server.session"]) => (input: Endpoint4_21Input) =>
   Stream.unwrap(
     raw["session.events"]({ params: { sessionID: input["sessionID"] }, query: { after: input["after"] } }).pipe(
       Effect.mapError(mapClientError),
@@ -232,22 +275,22 @@ const Endpoint4_17 = (raw: RawClient["server.session"]) => (input: Endpoint4_17I
     ),
   )
 
-type Endpoint4_18Request = Parameters<RawClient["server.session"]["session.interrupt"]>[0]
-type Endpoint4_18Input = { readonly sessionID: Endpoint4_18Request["params"]["sessionID"] }
-const Endpoint4_18 = (raw: RawClient["server.session"]) => (input: Endpoint4_18Input) =>
+type Endpoint4_22Request = Parameters<RawClient["server.session"]["session.interrupt"]>[0]
+type Endpoint4_22Input = { readonly sessionID: Endpoint4_22Request["params"]["sessionID"] }
+const Endpoint4_22 = (raw: RawClient["server.session"]) => (input: Endpoint4_22Input) =>
   raw["session.interrupt"]({ params: { sessionID: input["sessionID"] } }).pipe(Effect.mapError(mapClientError))
 
-type Endpoint4_19Request = Parameters<RawClient["server.session"]["session.background"]>[0]
-type Endpoint4_19Input = { readonly sessionID: Endpoint4_19Request["params"]["sessionID"] }
-const Endpoint4_19 = (raw: RawClient["server.session"]) => (input: Endpoint4_19Input) =>
+type Endpoint4_23Request = Parameters<RawClient["server.session"]["session.background"]>[0]
+type Endpoint4_23Input = { readonly sessionID: Endpoint4_23Request["params"]["sessionID"] }
+const Endpoint4_23 = (raw: RawClient["server.session"]) => (input: Endpoint4_23Input) =>
   raw["session.background"]({ params: { sessionID: input["sessionID"] } }).pipe(Effect.mapError(mapClientError))
 
-type Endpoint4_20Request = Parameters<RawClient["server.session"]["session.message"]>[0]
-type Endpoint4_20Input = {
-  readonly sessionID: Endpoint4_20Request["params"]["sessionID"]
-  readonly messageID: Endpoint4_20Request["params"]["messageID"]
+type Endpoint4_24Request = Parameters<RawClient["server.session"]["session.message"]>[0]
+type Endpoint4_24Input = {
+  readonly sessionID: Endpoint4_24Request["params"]["sessionID"]
+  readonly messageID: Endpoint4_24Request["params"]["messageID"]
 }
-const Endpoint4_20 = (raw: RawClient["server.session"]) => (input: Endpoint4_20Input) =>
+const Endpoint4_24 = (raw: RawClient["server.session"]) => (input: Endpoint4_24Input) =>
   raw["session.message"]({ params: { sessionID: input["sessionID"], messageID: input["messageID"] } }).pipe(
     Effect.mapError(mapClientError),
     Effect.map((value) => value.data),
@@ -264,17 +307,21 @@ const adaptGroup4 = (raw: RawClient["server.session"]) => ({
   rename: Endpoint4_7(raw),
   prompt: Endpoint4_8(raw),
   skill: Endpoint4_9(raw),
-  compact: Endpoint4_10(raw),
-  wait: Endpoint4_11(raw),
-  revertStage: Endpoint4_12(raw),
-  revertClear: Endpoint4_13(raw),
-  revertCommit: Endpoint4_14(raw),
-  context: Endpoint4_15(raw),
-  history: Endpoint4_16(raw),
-  events: Endpoint4_17(raw),
-  interrupt: Endpoint4_18(raw),
-  background: Endpoint4_19(raw),
-  message: Endpoint4_20(raw),
+  synthetic: Endpoint4_10(raw),
+  compact: Endpoint4_11(raw),
+  wait: Endpoint4_12(raw),
+  revertStage: Endpoint4_13(raw),
+  revertClear: Endpoint4_14(raw),
+  revertCommit: Endpoint4_15(raw),
+  context: Endpoint4_16(raw),
+  listContextEntries: Endpoint4_17(raw),
+  putContextEntry: Endpoint4_18(raw),
+  removeContextEntry: Endpoint4_19(raw),
+  history: Endpoint4_20(raw),
+  events: Endpoint4_21(raw),
+  interrupt: Endpoint4_22(raw),
+  background: Endpoint4_23(raw),
+  message: Endpoint4_24(raw),
 })
 
 type Endpoint5_0Request = Parameters<RawClient["server.message"]["session.messages"]>[0]
@@ -297,7 +344,12 @@ type Endpoint6_0Input = { readonly location?: Endpoint6_0Request["query"]["locat
 const Endpoint6_0 = (raw: RawClient["server.model"]) => (input?: Endpoint6_0Input) =>
   raw["model.list"]({ query: { location: input?.["location"] } }).pipe(Effect.mapError(mapClientError))
 
-const adaptGroup6 = (raw: RawClient["server.model"]) => ({ list: Endpoint6_0(raw) })
+type Endpoint6_1Request = Parameters<RawClient["server.model"]["model.default"]>[0]
+type Endpoint6_1Input = { readonly location?: Endpoint6_1Request["query"]["location"] }
+const Endpoint6_1 = (raw: RawClient["server.model"]) => (input?: Endpoint6_1Input) =>
+  raw["model.default"]({ query: { location: input?.["location"] } }).pipe(Effect.mapError(mapClientError))
+
+const adaptGroup6 = (raw: RawClient["server.model"]) => ({ list: Endpoint6_0(raw), default: Endpoint6_1(raw) })
 
 type Endpoint7_0Request = Parameters<RawClient["server.generate"]["generate.text"]>[0]
 type Endpoint7_0Input = {

packages/client/src/generated/client.ts

@@ -25,6 +25,8 @@ import type {
   SessionPromptOutput,
   SessionSkillInput,
   SessionSkillOutput,
+  SessionSyntheticInput,
+  SessionSyntheticOutput,
   SessionCompactInput,
   SessionCompactOutput,
   SessionWaitInput,
@@ -37,6 +39,12 @@ import type {
   SessionRevertCommitOutput,
   SessionContextInput,
   SessionContextOutput,
+  SessionListContextEntriesInput,
+  SessionListContextEntriesOutput,
+  SessionPutContextEntryInput,
+  SessionPutContextEntryOutput,
+  SessionRemoveContextEntryInput,
+  SessionRemoveContextEntryOutput,
   SessionHistoryInput,
   SessionHistoryOutput,
   SessionEventsInput,
@@ -51,6 +59,8 @@ import type {
   MessageListOutput,
   ModelListInput,
   ModelListOutput,
+  ModelDefaultInput,
+  ModelDefaultOutput,
   GenerateTextInput,
   GenerateTextOutput,
   ProviderListInput,
@@ -461,6 +471,18 @@ export function make(options: ClientOptions) {
           },
           requestOptions,
         ),
+      synthetic: (input: SessionSyntheticInput, requestOptions?: RequestOptions) =>
+        request<SessionSyntheticOutput>(
+          {
+            method: "POST",
+            path: `/api/session/${encodeURIComponent(input.sessionID)}/synthetic`,
+            body: { text: input["text"], description: input["description"], metadata: input["metadata"] },
+            successStatus: 204,
+            declaredStatuses: [404, 400, 401],
+            empty: true,
+          },
+          requestOptions,
+        ),
       compact: (input: SessionCompactInput, requestOptions?: RequestOptions) =>
         request<SessionCompactOutput>(
           {
@@ -528,6 +550,40 @@ export function make(options: ClientOptions) {
           },
           requestOptions,
         ).then((value) => value.data),
+      listContextEntries: (input: SessionListContextEntriesInput, requestOptions?: RequestOptions) =>
+        request<{ readonly data: SessionListContextEntriesOutput }>(
+          {
+            method: "GET",
+            path: `/api/session/${encodeURIComponent(input.sessionID)}/context-entry`,
+            successStatus: 200,
+            declaredStatuses: [404, 400, 401],
+            empty: false,
+          },
+          requestOptions,
+        ).then((value) => value.data),
+      putContextEntry: (input: SessionPutContextEntryInput, requestOptions?: RequestOptions) =>
+        request<SessionPutContextEntryOutput>(
+          {
+            method: "PUT",
+            path: `/api/session/${encodeURIComponent(input.sessionID)}/context-entry/${encodeURIComponent(input.key)}`,
+            body: { value: input["value"] },
+            successStatus: 204,
+            declaredStatuses: [404, 400, 401],
+            empty: true,
+          },
+          requestOptions,
+        ),
+      removeContextEntry: (input: SessionRemoveContextEntryInput, requestOptions?: RequestOptions) =>
+        request<SessionRemoveContextEntryOutput>(
+          {
+            method: "DELETE",
+            path: `/api/session/${encodeURIComponent(input.sessionID)}/context-entry/${encodeURIComponent(input.key)}`,
+            successStatus: 204,
+            declaredStatuses: [404, 400, 401],
+            empty: true,
+          },
+          requestOptions,
+        ),
       history: (input: SessionHistoryInput, requestOptions?: RequestOptions) =>
         request<SessionHistoryOutput>(
           {
@@ -613,6 +669,18 @@ export function make(options: ClientOptions) {
           },
           requestOptions,
         ),
+      default: (input?: ModelDefaultInput, requestOptions?: RequestOptions) =>
+        request<ModelDefaultOutput>(
+          {
+            method: "GET",
+            path: `/api/model/default`,
+            query: { location: input?.["location"] },
+            successStatus: 200,
+            declaredStatuses: [503, 401, 400],
+            empty: false,
+          },
+          requestOptions,
+        ),
     },
     generate: {
       text: (input: GenerateTextInput, requestOptions?: RequestOptions) =>

packages/client/src/generated/types.ts

@@ -151,6 +151,7 @@ export type AgentListOutput = {
     readonly id: string
     readonly model?: { readonly id: string; readonly providerID: string; readonly variant?: string }
     readonly request: {
+      readonly settings: { readonly [x: string]: JsonValue }
       readonly headers: { readonly [x: string]: string }
       readonly body: { readonly [x: string]: JsonValue }
     }
@@ -584,6 +585,27 @@ export type SessionSkillInput = {
 
 export type SessionSkillOutput = void
 
+export type SessionSyntheticInput = {
+  readonly sessionID: { readonly sessionID: string }["sessionID"]
+  readonly text: {
+    readonly text: string
+    readonly description?: string | null
+    readonly metadata?: { readonly [x: string]: JsonValue }
+  }["text"]
+  readonly description?: {
+    readonly text: string
+    readonly description?: string | null
+    readonly metadata?: { readonly [x: string]: JsonValue }
+  }["description"]
+  readonly metadata?: {
+    readonly text: string
+    readonly description?: string | null
+    readonly metadata?: { readonly [x: string]: JsonValue }
+  }["metadata"]
+}
+
+export type SessionSyntheticOutput = void
+
 export type SessionCompactInput = { readonly sessionID: { readonly sessionID: string }["sessionID"] }
 
 export type SessionCompactOutput = void
@@ -787,6 +809,27 @@ export type SessionContextOutput = {
   >
 }["data"]
 
+export type SessionListContextEntriesInput = { readonly sessionID: { readonly sessionID: string }["sessionID"] }
+
+export type SessionListContextEntriesOutput = {
+  readonly data: ReadonlyArray<{ readonly key: string; readonly value: JsonValue }>
+}["data"]
+
+export type SessionPutContextEntryInput = {
+  readonly sessionID: { readonly sessionID: string; readonly key: string }["sessionID"]
+  readonly key: { readonly sessionID: string; readonly key: string }["key"]
+  readonly value: { readonly value: JsonValue }["value"]
+}
+
+export type SessionPutContextEntryOutput = void
+
+export type SessionRemoveContextEntryInput = {
+  readonly sessionID: { readonly sessionID: string; readonly key: string }["sessionID"]
+  readonly key: { readonly sessionID: string; readonly key: string }["key"]
+}
+
+export type SessionRemoveContextEntryOutput = void
+
 export type SessionHistoryInput = {
   readonly sessionID: { readonly sessionID: string }["sessionID"]
   readonly limit?: { readonly limit?: number | undefined; readonly after?: number | undefined }["limit"]
@@ -934,6 +977,7 @@ export type SessionHistoryOutput = {
           readonly messageID: string
           readonly text: string
           readonly description?: string
+          readonly metadata?: { readonly [x: string]: JsonValue }
         }
       }
     | {
@@ -1428,6 +1472,7 @@ export type SessionEventsOutput =
         readonly messageID: string
         readonly text: string
         readonly description?: string
+        readonly metadata?: { readonly [x: string]: unknown }
       }
     }
   | {
@@ -2169,12 +2214,14 @@ export type ModelListOutput = {
       readonly output: ReadonlyArray<string>
     }
     readonly request: {
+      readonly settings: { readonly [x: string]: JsonValue }
       readonly headers: { readonly [x: string]: string }
       readonly body: { readonly [x: string]: JsonValue }
       readonly variant?: string
     }
     readonly variants: ReadonlyArray<{
       readonly id: string
+      readonly settings: { readonly [x: string]: JsonValue }
       readonly headers: { readonly [x: string]: string }
       readonly body: { readonly [x: string]: JsonValue }
     }>
@@ -2191,6 +2238,67 @@ export type ModelListOutput = {
   }>
 }
 
+export type ModelDefaultInput = {
+  readonly location?: {
+    readonly location?: { readonly directory?: string | undefined; readonly workspace?: string | undefined } | undefined
+  }["location"]
+}
+
+export type ModelDefaultOutput = {
+  readonly location: {
+    readonly directory: string
+    readonly workspaceID?: string
+    readonly project: { readonly id: string; readonly directory: string }
+  }
+  readonly data: {
+    readonly id: string
+    readonly providerID: string
+    readonly family?: string
+    readonly name: string
+    readonly api:
+      | {
+          readonly id: string
+          readonly type: "aisdk"
+          readonly package: string
+          readonly url?: string
+          readonly settings?: { readonly [x: string]: JsonValue }
+        }
+      | {
+          readonly id: string
+          readonly type: "native"
+          readonly url?: string
+          readonly settings: { readonly [x: string]: JsonValue }
+        }
+    readonly capabilities: {
+      readonly tools: boolean
+      readonly input: ReadonlyArray<string>
+      readonly output: ReadonlyArray<string>
+    }
+    readonly request: {
+      readonly settings: { readonly [x: string]: JsonValue }
+      readonly headers: { readonly [x: string]: string }
+      readonly body: { readonly [x: string]: JsonValue }
+      readonly variant?: string
+    }
+    readonly variants: ReadonlyArray<{
+      readonly id: string
+      readonly settings: { readonly [x: string]: JsonValue }
+      readonly headers: { readonly [x: string]: string }
+      readonly body: { readonly [x: string]: JsonValue }
+    }>
+    readonly time: { readonly released: number }
+    readonly cost: ReadonlyArray<{
+      readonly tier?: { readonly type: "context"; readonly size: number }
+      readonly input: number
+      readonly output: number
+      readonly cache: { readonly read: number; readonly write: number }
+    }>
+    readonly status: "alpha" | "beta" | "deprecated" | "active"
+    readonly enabled: boolean
+    readonly limit: { readonly context: number; readonly input?: number; readonly output: number }
+  } | null
+}
+
 export type GenerateTextInput = {
   readonly location?: {
     readonly location?: { readonly directory?: string | undefined; readonly workspace?: string | undefined } | undefined
@@ -2233,6 +2341,7 @@ export type ProviderListOutput = {
         }
       | { readonly type: "native"; readonly url?: string; readonly settings: { readonly [x: string]: JsonValue } }
     readonly request: {
+      readonly settings: { readonly [x: string]: JsonValue }
       readonly headers: { readonly [x: string]: string }
       readonly body: { readonly [x: string]: JsonValue }
     }
@@ -2266,6 +2375,7 @@ export type ProviderGetOutput = {
         }
       | { readonly type: "native"; readonly url?: string; readonly settings: { readonly [x: string]: JsonValue } }
     readonly request: {
+      readonly settings: { readonly [x: string]: JsonValue }
       readonly headers: { readonly [x: string]: string }
       readonly body: { readonly [x: string]: JsonValue }
     }
@@ -3505,6 +3615,19 @@ export type EventSubscribeOutput =
         readonly delivery: "steer" | "queue"
       }
     }
+  | {
+      readonly id: string
+      readonly metadata?: { readonly [x: string]: unknown }
+      readonly type: "session.next.execution.settled"
+      readonly durable?: { readonly aggregateID: string; readonly seq: number; readonly version: number }
+      readonly location?: { readonly directory: string; readonly workspaceID?: string }
+      readonly data: {
+        readonly timestamp: number
+        readonly sessionID: string
+        readonly outcome: "success" | "failure" | "interrupted"
+        readonly error?: { readonly type: "unknown"; readonly message: string }
+      }
+    }
   | {
       readonly id: string
       readonly metadata?: { readonly [x: string]: unknown }
@@ -3530,6 +3653,7 @@ export type EventSubscribeOutput =
         readonly messageID: string
         readonly text: string
         readonly description?: string
+        readonly metadata?: { readonly [x: string]: unknown }
       }
     }
   | {

packages/core/schema.json

@@ -1,8 +1,10 @@
 {
   "version": "7",
   "dialect": "sqlite",
-  "id": "f14a9b18-8207-487e-a3d3-227e629ba9ad",
-  "prevIds": ["169a0f0f-d58f-479f-b024-fa1c7b9a09db"],
+  "id": "22e57fed-b9b8-4e94-a3b4-f94bece680a8",
+  "prevIds": [
+    "f14a9b18-8207-487e-a3d3-227e629ba9ad"
+  ],
   "ddl": [
     {
       "name": "workspace",
@@ -60,6 +62,10 @@
       "name": "session_context_epoch",
       "entityType": "tables"
     },
+    {
+      "name": "session_context_entry",
+      "entityType": "tables"
+    },
     {
       "name": "session_input",
       "entityType": "tables"
@@ -920,6 +926,56 @@
       "entityType": "columns",
       "table": "session_context_epoch"
     },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "session_id",
+      "entityType": "columns",
+      "table": "session_context_entry"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "key",
+      "entityType": "columns",
+      "table": "session_context_entry"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "value",
+      "entityType": "columns",
+      "table": "session_context_entry"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_created",
+      "entityType": "columns",
+      "table": "session_context_entry"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_updated",
+      "entityType": "columns",
+      "table": "session_context_entry"
+    },
     {
       "type": "text",
       "notNull": false,
@@ -1481,9 +1537,13 @@
       "table": "session_share"
     },
     {
-      "columns": ["project_id"],
+      "columns": [
+        "project_id"
+      ],
       "tableTo": "project",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1492,9 +1552,13 @@
       "table": "workspace"
     },
     {
-      "columns": ["active_account_id"],
+      "columns": [
+        "active_account_id"
+      ],
       "tableTo": "account",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "SET NULL",
       "nameExplicit": false,
@@ -1503,9 +1567,13 @@
       "table": "account_state"
     },
     {
-      "columns": ["aggregate_id"],
+      "columns": [
+        "aggregate_id"
+      ],
       "tableTo": "event_sequence",
-      "columnsTo": ["aggregate_id"],
+      "columnsTo": [
+        "aggregate_id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1514,9 +1582,13 @@
       "table": "event"
     },
     {
-      "columns": ["project_id"],
+      "columns": [
+        "project_id"
+      ],
       "tableTo": "project",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1525,9 +1597,13 @@
       "table": "permission"
     },
     {
-      "columns": ["project_id"],
+      "columns": [
+        "project_id"
+      ],
       "tableTo": "project",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1536,9 +1612,13 @@
       "table": "project_directory"
     },
     {
-      "columns": ["session_id"],
+      "columns": [
+        "session_id"
+      ],
       "tableTo": "session",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1547,9 +1627,13 @@
       "table": "message"
     },
     {
-      "columns": ["message_id"],
+      "columns": [
+        "message_id"
+      ],
       "tableTo": "message",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1558,9 +1642,13 @@
       "table": "part"
     },
     {
-      "columns": ["session_id"],
+      "columns": [
+        "session_id"
+      ],
       "tableTo": "session",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1569,9 +1657,28 @@
       "table": "session_context_epoch"
     },
     {
-      "columns": ["session_id"],
+      "columns": [
+        "session_id"
+      ],
       "tableTo": "session",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "nameExplicit": false,
+      "name": "fk_session_context_entry_session_id_session_id_fk",
+      "entityType": "fks",
+      "table": "session_context_entry"
+    },
+    {
+      "columns": [
+        "session_id"
+      ],
+      "tableTo": "session",
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1580,9 +1687,13 @@
       "table": "session_input"
     },
     {
-      "columns": ["session_id"],
+      "columns": [
+        "session_id"
+      ],
       "tableTo": "session",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1591,9 +1702,13 @@
       "table": "session_message"
     },
     {
-      "columns": ["project_id"],
+      "columns": [
+        "project_id"
+      ],
       "tableTo": "project",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1602,9 +1717,13 @@
       "table": "session"
     },
     {
-      "columns": ["session_id"],
+      "columns": [
+        "session_id"
+      ],
       "tableTo": "session",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1613,9 +1732,13 @@
       "table": "todo"
     },
     {
-      "columns": ["session_id"],
+      "columns": [
+        "session_id"
+      ],
       "tableTo": "session",
-      "columnsTo": ["id"],
+      "columnsTo": [
+        "id"
+      ],
       "onUpdate": "NO ACTION",
       "onDelete": "CASCADE",
       "nameExplicit": false,
@@ -1624,133 +1747,184 @@
       "table": "session_share"
     },
     {
-      "columns": ["email", "url"],
+      "columns": [
+        "email",
+        "url"
+      ],
       "nameExplicit": false,
       "name": "control_account_pk",
       "entityType": "pks",
       "table": "control_account"
     },
     {
-      "columns": ["project_id", "directory"],
+      "columns": [
+        "project_id",
+        "directory"
+      ],
       "nameExplicit": false,
       "name": "project_directory_pk",
       "entityType": "pks",
       "table": "project_directory"
     },
     {
-      "columns": ["session_id", "position"],
+      "columns": [
+        "session_id",
+        "key"
+      ],
+      "nameExplicit": false,
+      "name": "session_context_entry_pk",
+      "entityType": "pks",
+      "table": "session_context_entry"
+    },
+    {
+      "columns": [
+        "session_id",
+        "position"
+      ],
       "nameExplicit": false,
       "name": "todo_pk",
       "entityType": "pks",
       "table": "todo"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "workspace_pk",
       "table": "workspace",
       "entityType": "pks"
     },
     {
-      "columns": ["name"],
+      "columns": [
+        "name"
+      ],
       "nameExplicit": false,
       "name": "data_migration_pk",
       "table": "data_migration",
       "entityType": "pks"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "account_state_pk",
       "table": "account_state",
       "entityType": "pks"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "account_pk",
       "table": "account",
       "entityType": "pks"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "credential_pk",
       "table": "credential",
       "entityType": "pks"
     },
     {
-      "columns": ["aggregate_id"],
+      "columns": [
+        "aggregate_id"
+      ],
       "nameExplicit": false,
       "name": "event_sequence_pk",
       "table": "event_sequence",
       "entityType": "pks"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "event_pk",
       "table": "event",
       "entityType": "pks"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "permission_pk",
       "table": "permission",
       "entityType": "pks"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "project_pk",
       "table": "project",
       "entityType": "pks"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "message_pk",
       "table": "message",
       "entityType": "pks"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "part_pk",
       "table": "part",
       "entityType": "pks"
     },
     {
-      "columns": ["session_id"],
+      "columns": [
+        "session_id"
+      ],
       "nameExplicit": false,
       "name": "session_context_epoch_pk",
       "table": "session_context_epoch",
       "entityType": "pks"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "session_input_pk",
       "table": "session_input",
       "entityType": "pks"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "session_message_pk",
       "table": "session_message",
       "entityType": "pks"
     },
     {
-      "columns": ["id"],
+      "columns": [
+        "id"
+      ],
       "nameExplicit": false,
       "name": "session_pk",
       "table": "session",
       "entityType": "pks"
     },
     {
-      "columns": ["session_id"],
+      "columns": [
+        "session_id"
+      ],
       "nameExplicit": false,
       "name": "session_share_pk",
       "table": "session_share",
@@ -2068,4 +2242,4 @@
     }
   ],
   "renames": []
-}
+}

packages/core/src/catalog.ts

@@ -85,6 +85,7 @@ const layer = Layer.effect(
               ? { ...model.api, settings: { ...provider.api.settings, ...model.api.settings } }
               : model.api
       const request = {
+        settings: { ...provider.request.settings, ...model.request.settings },
         headers: { ...provider.request.headers, ...model.request.headers },
         body: { ...provider.request.body, ...model.request.body },
         variant: model.request.variant,

packages/core/src/config/plugin/provider.ts

@@ -4,7 +4,6 @@ import { define } from "../../plugin/internal"
 import { Effect } from "effect"
 import { Config } from "../../config"
 import { ModelV2 } from "../../model"
-import { ProviderV2 } from "../../provider"
 
 export const Plugin = define({
   id: "config-provider",
@@ -54,6 +53,7 @@ export const Plugin = define({
               if (item.name !== undefined) provider.name = item.name
               if (item.api !== undefined) provider.api = { ...item.api }
               if (item.request !== undefined) {
+                Object.assign(provider.request.settings, item.request.settings)
                 Object.assign(provider.request.headers, item.request.headers)
                 Object.assign(provider.request.body, item.request.body)
               }
@@ -71,6 +71,7 @@ export const Plugin = define({
                   }
                 }
                 if (config.request !== undefined) {
+                  Object.assign(model.request.settings, config.request.settings)
                   Object.assign(model.request.headers, config.request.headers)
                   Object.assign(model.request.body, config.request.body)
                   if (config.request.variant !== undefined) model.request.variant = config.request.variant
@@ -81,11 +82,13 @@ export const Plugin = define({
                     if (!existing) {
                       existing = {
                         id: variant.id,
+                        settings: {},
                         headers: {},
                         body: {},
                       }
                       model.variants.push(existing)
                     }
+                    Object.assign(existing.settings, variant.settings)
                     Object.assign(existing.headers, variant.headers)
                     Object.assign(existing.body, variant.body)
                   }

packages/core/src/config/provider.ts

@@ -5,6 +5,7 @@ import { ProviderV2 } from "../provider"
 import { ModelV2 } from "../model"
 
 export class Request extends Schema.Class<Request>("ConfigV2.Provider.Request")({
+  settings: ProviderV2.Settings.pipe(Schema.optional),
   headers: Schema.Record(Schema.String, Schema.String).pipe(Schema.optional),
   body: Schema.Record(Schema.String, Schema.Unknown).pipe(Schema.optional),
 }) {}

packages/core/src/database/migration.gen.ts

@@ -40,5 +40,6 @@ export const migrations = (
     import("./migration/20260622142730_simplify_session_context_epoch"),
     import("./migration/20260622170816_reset_v2_session_state"),
     import("./migration/20260622202450_simplify_session_input"),
+    import("./migration/20260702134641_add_session_context_entry"),
   ])
 ).map((module) => module.default) satisfies DatabaseMigration.Migration[]

packages/core/src/database/migration/20260702134641_add_session_context_entry.ts

@@ -0,0 +1,21 @@
+import { Effect } from "effect"
+import type { DatabaseMigration } from "../migration"
+
+export default {
+  id: "20260702134641_add_session_context_entry",
+  up(tx) {
+    return Effect.gen(function* () {
+      yield* tx.run(`
+        CREATE TABLE \`session_context_entry\` (
+          \`session_id\` text NOT NULL,
+          \`key\` text NOT NULL,
+          \`value\` text NOT NULL,
+          \`time_created\` integer NOT NULL,
+          \`time_updated\` integer NOT NULL,
+          CONSTRAINT \`session_context_entry_pk\` PRIMARY KEY(\`session_id\`, \`key\`),
+          CONSTRAINT \`fk_session_context_entry_session_id_session_id_fk\` FOREIGN KEY (\`session_id\`) REFERENCES \`session\`(\`id\`) ON DELETE CASCADE
+        );
+      `)
+    })
+  },
+} satisfies DatabaseMigration.Migration

packages/core/src/database/schema.gen.ts

@@ -154,6 +154,17 @@ export default {
           CONSTRAINT \`fk_session_context_epoch_session_id_session_id_fk\` FOREIGN KEY (\`session_id\`) REFERENCES \`session\`(\`id\`) ON DELETE CASCADE
         );
       `)
+      yield* tx.run(`
+        CREATE TABLE \`session_context_entry\` (
+          \`session_id\` text NOT NULL,
+          \`key\` text NOT NULL,
+          \`value\` text NOT NULL,
+          \`time_created\` integer NOT NULL,
+          \`time_updated\` integer NOT NULL,
+          CONSTRAINT \`session_context_entry_pk\` PRIMARY KEY(\`session_id\`, \`key\`),
+          CONSTRAINT \`fk_session_context_entry_session_id_session_id_fk\` FOREIGN KEY (\`session_id\`) REFERENCES \`session\`(\`id\`) ON DELETE CASCADE
+        );
+      `)
       yield* tx.run(`
         CREATE TABLE \`session_input\` (
           \`id\` text PRIMARY KEY,

packages/core/src/effect/dfdf

@@ -1 +0,0 @@
-File to save in: ~/.local/share/opencode/worktree/012780/location-layer-tiers/packages/core/src/effect/

packages/core/src/instruction-context.ts

@@ -1,6 +1,6 @@
 export * as InstructionContext from "./instruction-context"
 
-import { Array, Effect, Layer, Schema } from "effect"
+import { Array, Context, Effect, Layer, Schema } from "effect"
 import { isAbsolute, join, relative, sep } from "path"
 import { FSUtil } from "./fs-util"
 import { Flag } from "./flag/flag"
@@ -8,7 +8,6 @@ import { Global } from "./global"
 import { Location } from "./location"
 import { AbsolutePath } from "./schema"
 import { SystemContext } from "./system-context/index"
-import { SystemContextRegistry } from "./system-context/registry"
 import { makeLocationNode } from "./effect/app-node"
 
 class File extends Schema.Class<File>("InstructionContext.File")({
@@ -19,12 +18,18 @@ class File extends Schema.Class<File>("InstructionContext.File")({
 const Files = Schema.Array(File)
 const key = SystemContext.Key.make("core/instructions")
 
-const layer = Layer.effectDiscard(
+export interface Interface {
+  readonly load: () => Effect.Effect<SystemContext.SystemContext>
+}
+
+export class Service extends Context.Service<Service, Interface>()("@opencode/v2/InstructionContext") {}
+
+const layer = Layer.effect(
+  Service,
   Effect.gen(function* () {
     const fs = yield* FSUtil.Service
     const global = yield* Global.Service
     const location = yield* Location.Service
-    const registry = yield* SystemContextRegistry.Service
 
     const source = (value: ReadonlyArray<File> | SystemContext.Unavailable) =>
       SystemContext.make({
@@ -71,28 +76,24 @@ const layer = Layer.effectDiscard(
       return files.filter((file): file is File => file !== undefined)
     })
 
-    yield* registry.register({
-      key,
-      load: observe().pipe(
-        Effect.map((files) =>
-          files === SystemContext.unavailable
-            ? source(files)
-            : files.length === 0
-              ? SystemContext.empty
-              : source(files),
+    return Service.of({
+      load: () =>
+        observe().pipe(
+          Effect.map((files) =>
+            files === SystemContext.unavailable
+              ? source(files)
+              : files.length === 0
+                ? SystemContext.empty
+                : source(files),
+          ),
+          Effect.catch(() => Effect.succeed(source(SystemContext.unavailable))),
+          Effect.catchDefect(() => Effect.succeed(source(SystemContext.unavailable))),
         ),
-        Effect.catch(() => Effect.succeed(source(SystemContext.unavailable))),
-        Effect.catchDefect(() => Effect.succeed(source(SystemContext.unavailable))),
-      ),
     })
   }),
 )
 
-export const node = makeLocationNode({
-  name: "instruction-context",
-  layer,
-  deps: [FSUtil.node, Global.node, Location.node, SystemContextRegistry.node],
-})
+export const node = makeLocationNode({ service: Service, layer, deps: [FSUtil.node, Global.node, Location.node] })
 
 function render(files: ReadonlyArray<File>) {
   return files.map((file) => `Instructions from: ${file.path}\n${file.content}`).join("\n\n")

packages/core/src/location-services.ts

@@ -36,8 +36,10 @@ import { SessionTodo } from "./session/todo"
 import { SkillV2 } from "./skill"
 import { SkillGuidance } from "./skill/guidance"
 import { Snapshot } from "./snapshot"
+import { InstructionContext } from "./instruction-context"
 import { SystemContextBuiltIns } from "./system-context/builtins"
-import { SystemContextRegistry } from "./system-context/registry"
+import { SessionContextEntry } from "./session/context-entry"
+import { SessionInstructions } from "./session/instructions"
 import { BuiltInTools } from "./tool/builtins"
 import { McpTool } from "./tool/mcp"
 import { ReadToolFileSystem } from "./tool/read-filesystem"
@@ -67,8 +69,8 @@ export const locationServices = LayerNode.group([
   Pty.node,
   Shell.node,
   SkillV2.node,
-  SystemContextRegistry.node,
   SystemContextBuiltIns.node,
+  InstructionContext.node,
   LocationMutation.node,
   FileMutation.node,
   MCP.node,
@@ -80,11 +82,13 @@ export const locationServices = LayerNode.group([
   SkillGuidance.node,
   ReferenceGuidance.node,
   SessionTodo.node,
+  SessionContextEntry.node,
   QuestionV2.node,
   Generate.node,
   ReadToolFileSystem.node,
   BuiltInTools.node,
   McpTool.node,
+  SessionInstructions.node,
   SessionRunnerModel.node,
   SessionCompaction.node,
   SessionTitle.node,

packages/core/src/mcp/guidance.ts

@@ -14,16 +14,40 @@ const Summary = Schema.Struct({
 })
 type Summary = typeof Summary.Type
 
+const entries = (servers: ReadonlyArray<Summary>) =>
+  servers.flatMap((server) => [
+    `  <server name="${server.server}">`,
+    ...server.instructions.split("\n").map((line) => `    ${line}`),
+    "  </server>",
+  ])
+
 const render = (servers: ReadonlyArray<Summary>) =>
-  [
-    "<mcp_instructions>",
-    ...servers.flatMap((server) => [
-      `  <server name="${server.server}">`,
-      ...server.instructions.split("\n").map((line) => `    ${line}`),
-      "  </server>",
-    ]),
-    "</mcp_instructions>",
+  ["<mcp_instructions>", ...entries(servers), "</mcp_instructions>"].join("\n")
+
+const update = (previous: ReadonlyArray<Summary>, current: ReadonlyArray<Summary>) => {
+  const diff = SystemContext.diffByKey(
+    previous,
+    current,
+    (server) => server.server,
+    (before, after) => before.instructions !== after.instructions,
+  )
+  // Additions and removals render as small deltas; anything else restates the full list.
+  if (diff.changed.length > 0 || (diff.added.length === 0 && diff.removed.length === 0))
+    return [
+      "The available MCP server instructions have changed. This list supersedes the previous one.",
+      render(current),
+    ].join("\n")
+  return [
+    ...(diff.added.length === 0
+      ? []
+      : ["New MCP server instructions are available in addition to those previously listed:", ...entries(diff.added)]),
+    ...(diff.removed.length === 0
+      ? []
+      : [
+          `Instructions for the following MCP servers are no longer available: ${diff.removed.map((server) => server.server).join(", ")}.`,
+        ]),
   ].join("\n")
+}
 
 export interface Interface {
   readonly load: (agent: AgentV2.Selection) => Effect.Effect<SystemContext.SystemContext>
@@ -50,7 +74,8 @@ export const layer = Layer.effect(
             return (
               owned.length === 0 ||
               owned.some(
-                (tool) => PermissionV2.evaluate(McpTool.name(tool.server, tool.name), "*", agent.permissions).effect !== "deny",
+                (tool) =>
+                  PermissionV2.evaluate(McpTool.name(tool.server, tool.name), "*", agent.permissions).effect !== "deny",
               )
             )
           })
@@ -61,11 +86,7 @@ export const layer = Layer.effect(
           codec: Schema.toCodecJson(Schema.Array(Summary)),
           load: Effect.succeed(visible),
           baseline: render,
-          update: (_previous, current) =>
-            [
-              "The available MCP server instructions have changed. This list supersedes the previous one.",
-              render(current),
-            ].join("\n"),
+          update,
           removed: () => "MCP server instructions are no longer available.",
         })
       }),

packages/core/src/model.ts

@@ -26,8 +26,13 @@ export type Api = Model.Api
 export const Info = Model.Info
 export type Info = Model.Info
 
-export type MutableInfo = Omit<Types.DeepMutable<Info>, "api"> & {
+export type MutableRequest = ProviderV2.MutableRequest & { variant?: string }
+export type MutableVariant = ProviderV2.MutableRequest & { id: VariantID }
+
+export type MutableInfo = Omit<Types.DeepMutable<Info>, "api" | "request" | "variants"> & {
   api: ProviderV2.MutableApi<Api>
+  request: MutableRequest
+  variants: MutableVariant[]
 }
 
 export function parse(input: string): { providerID: ProviderV2.ID; modelID: ID } {

packages/core/src/plugin.ts

@@ -18,6 +18,7 @@ import { Reference } from "./reference"
 import { SkillV2 } from "./skill"
 import { State } from "./state"
 import { ToolRegistry } from "./tool/registry"
+import { ToolHooks } from "./tool/hooks"
 
 export const ID = Plugin.ID
 export type ID = typeof ID.Type
@@ -165,6 +166,7 @@ export const node = makeLocationNode({
     Reference.node,
     SkillV2.node,
     ToolRegistry.toolsNode,
+    ToolHooks.node,
     PluginRuntime.node,
   ],
 })

packages/core/src/plugin/host.ts

@@ -17,6 +17,7 @@ import { Reference } from "../reference"
 import { AbsolutePath, type DeepMutable } from "../schema"
 import { SkillV2 } from "../skill"
 import { Tools } from "../tool/tools"
+import { ToolHooks } from "../tool/hooks"
 import { WorkspaceV2 } from "../workspace"
 
 const mutable = <T>(value: T) => value as DeepMutable<T>
@@ -31,6 +32,7 @@ export const make = Effect.fn("PluginHost.make")(function* (plugin: PluginV2.Int
   const reference = yield* Reference.Service
   const skill = yield* SkillV2.Service
   const tools = yield* Tools.Service
+  const toolHooks = yield* ToolHooks.Service
   const runtime = yield* PluginRuntime.Service
   const locationInfo = () =>
     new Location.Info({
@@ -247,6 +249,47 @@ export const make = Effect.fn("PluginHost.make")(function* (plugin: PluginV2.Int
     },
     tool: {
       register: (input) => tools.register(input),
+      execute: {
+        before: (callback) =>
+          toolHooks.hook.before((event) => {
+            const output = {
+              tool: event.tool,
+              sessionID: event.sessionID,
+              agent: event.agent,
+              assistantMessageID: event.assistantMessageID,
+              toolCallID: event.toolCallID,
+              input: event.input,
+            }
+            const result = callback(output)
+            return Effect.suspend(() => (Effect.isEffect(result) ? result : Effect.void)).pipe(
+              Effect.tap(() => Effect.sync(() => (event.input = output.input))),
+            )
+          }),
+        after: (callback) =>
+          toolHooks.hook.after((event) => {
+            const output = {
+              tool: event.tool,
+              sessionID: event.sessionID,
+              agent: event.agent,
+              assistantMessageID: event.assistantMessageID,
+              toolCallID: event.toolCallID,
+              input: event.input,
+              result: event.result,
+              output: event.output,
+              outputPaths: event.outputPaths,
+            }
+            const result = callback(output)
+            return Effect.suspend(() => (Effect.isEffect(result) ? result : Effect.void)).pipe(
+              Effect.tap(() =>
+                Effect.sync(() => {
+                  event.result = output.result
+                  event.output = output.output
+                  event.outputPaths = output.outputPaths
+                }),
+              ),
+            )
+          }),
+      },
     },
     session: {
       create: (input) =>

packages/core/src/plugin/internal.ts

@@ -3,7 +3,7 @@ export * as PluginInternal from "./internal"
 import { makeLocationNode } from "../effect/app-node"
 import { httpClient } from "../effect/app-node-platform"
 import type { PluginContext } from "@opencode-ai/plugin/v2/effect"
-import { Effect, Layer, Scope } from "effect"
+import { Context, Effect, Layer, Scope } from "effect"
 import { AgentV2 } from "../agent"
 import { Catalog } from "../catalog"
 import { CommandV2 } from "../command"
@@ -27,6 +27,7 @@ import { PluginV2 } from "../plugin"
 import { PluginRuntime } from "../plugin/runtime"
 import { PermissionV2 } from "../permission"
 import { Reference } from "../reference"
+import { Ripgrep } from "../ripgrep"
 import { Shell } from "../shell"
 import { SkillV2 } from "../skill"
 import { State } from "../state"
@@ -40,6 +41,7 @@ import { ProviderPlugins } from "./provider"
 import { SdkPlugins } from "./sdk"
 import { SkillPlugin } from "./skill"
 import { VariantPlugin } from "./variant"
+import { GlobTool } from "../tool/glob"
 import { ShellTool } from "../tool/shell"
 import { SubagentTool } from "../tool/subagent"
 
@@ -61,6 +63,7 @@ export type Requirements =
   | PermissionV2.Service
   | PluginRuntime.Service
   | Reference.Service
+  | Ripgrep.Service
   | Shell.Service
   | SkillV2.Service
   | Tools.Service
@@ -76,59 +79,35 @@ export function define<R>(plugin: Plugin<R>) {
 
 const layer = Layer.effectDiscard(
   Effect.gen(function* () {
-    const catalog = yield* Catalog.Service
-    const commands = yield* CommandV2.Service
     const plugin = yield* PluginV2.Service
     const sdkPlugins = yield* SdkPlugins.Service
-    const integration = yield* Integration.Service
-    const agents = yield* AgentV2.Service
-    const config = yield* Config.Service
-    const location = yield* Location.Service
-    const modelsDev = yield* ModelsDev.Service
-    const npm = yield* Npm.Service
-    const events = yield* EventV2.Service
-    const fs = yield* FSUtil.Service
-    const filesystem = yield* FileSystem.Service
-    const global = yield* Global.Service
-    const http = yield* HttpClient.HttpClient
-    const mutation = yield* LocationMutation.Service
-    const permission = yield* PermissionV2.Service
-    const skill = yield* SkillV2.Service
-    const reference = yield* Reference.Service
-    const shell = yield* Shell.Service
-    const tools = yield* Tools.Service
-    const runtime = yield* PluginRuntime.Service
-    const add = <R>(input: Plugin<R>) => {
-      const loaded = {
-        id: input.id,
-        effect: (context: PluginContext) =>
-          input
-            .effect(context)
-            .pipe(
-              Effect.provideService(Catalog.Service, catalog),
-              Effect.provideService(CommandV2.Service, commands),
-              Effect.provideService(Integration.Service, integration),
-              Effect.provideService(AgentV2.Service, agents),
-              Effect.provideService(Config.Service, config),
-              Effect.provideService(Location.Service, location),
-              Effect.provideService(ModelsDev.Service, modelsDev),
-              Effect.provideService(Npm.Service, npm),
-              Effect.provideService(EventV2.Service, events),
-              Effect.provideService(FSUtil.Service, fs),
-              Effect.provideService(FileSystem.Service, filesystem),
-              Effect.provideService(Global.Service, global),
-              Effect.provideService(HttpClient.HttpClient, http),
-              Effect.provideService(LocationMutation.Service, mutation),
-              Effect.provideService(PermissionV2.Service, permission),
-              Effect.provideService(SkillV2.Service, skill),
-              Effect.provideService(Reference.Service, reference),
-              Effect.provideService(Shell.Service, shell),
-              Effect.provideService(Tools.Service, tools),
-              Effect.provideService(PluginRuntime.Service, runtime),
-            ),
-      }
-      return plugin.add(PluginV2.ID.make(loaded.id), loaded.effect)
-    }
+    const services = Context.mergeAll(
+      Context.make(Catalog.Service, yield* Catalog.Service),
+      Context.make(CommandV2.Service, yield* CommandV2.Service),
+      Context.make(Integration.Service, yield* Integration.Service),
+      Context.make(AgentV2.Service, yield* AgentV2.Service),
+      Context.make(Config.Service, yield* Config.Service),
+      Context.make(Location.Service, yield* Location.Service),
+      Context.make(ModelsDev.Service, yield* ModelsDev.Service),
+      Context.make(Npm.Service, yield* Npm.Service),
+      Context.make(EventV2.Service, yield* EventV2.Service),
+      Context.make(FSUtil.Service, yield* FSUtil.Service),
+      Context.make(FileSystem.Service, yield* FileSystem.Service),
+      Context.make(Global.Service, yield* Global.Service),
+      Context.make(HttpClient.HttpClient, yield* HttpClient.HttpClient),
+      Context.make(LocationMutation.Service, yield* LocationMutation.Service),
+      Context.make(PermissionV2.Service, yield* PermissionV2.Service),
+      Context.make(SkillV2.Service, yield* SkillV2.Service),
+      Context.make(Reference.Service, yield* Reference.Service),
+      Context.make(Ripgrep.Service, yield* Ripgrep.Service),
+      Context.make(Shell.Service, yield* Shell.Service),
+      Context.make(Tools.Service, yield* Tools.Service),
+      Context.make(PluginRuntime.Service, yield* PluginRuntime.Service),
+    )
+    const add = (input: Plugin<Requirements | Scope.Scope>) =>
+      plugin.add(PluginV2.ID.make(input.id), (context: PluginContext) =>
+        input.effect(context).pipe(Effect.provide(services)),
+      )
 
     yield* State.batch(
       Effect.gen(function* () {
@@ -138,6 +117,7 @@ const layer = Layer.effectDiscard(
         yield* add(SkillPlugin.Plugin)
         yield* add(ModelsDevPlugin)
         yield* add(ConfigExternalPlugin.Plugin)
+        yield* add(GlobTool.Plugin)
         yield* add(ShellTool.Plugin)
         yield* add(SubagentTool.Plugin)
         yield* add(ConfigAgentPlugin.Plugin)
@@ -175,6 +155,7 @@ export const node = makeLocationNode({
     PermissionV2.node,
     SkillV2.node,
     Reference.node,
+    Ripgrep.node,
     Shell.node,
     ToolRegistry.toolsNode,
     PluginRuntime.node,

packages/core/src/plugin/models-dev.ts

@@ -70,25 +70,73 @@ function mergeCost(base: ModelV2Info["cost"], override: ModelsDev.Model["cost"]
   return [merge(baseDefault ?? { input: 0, output: 0, cache: { read: 0, write: 0 } }, nextDefault), ...tiers.values()]
 }
 
-function reasoningVariants(model: ModelsDev.Model, packageName: string | undefined): ModelV2Info["variants"] {
-  const result = new Map<ModelV2.VariantID, ModelV2Info["variants"][number]>()
-  if (packageName === "@ai-sdk/openai" || packageName === "@ai-sdk/openai-compatible") {
-    const option = model.reasoning_options?.find((option) => option.type === "effort")
-    for (const value of option?.values ?? []) {
-      const id = value === null ? "none" : value
-      if (typeof id !== "string") continue
-      const variantID = ModelV2.VariantID.make(id)
-      result.set(variantID, {
-        id: variantID,
-        headers: {},
-        body:
-          packageName === "@ai-sdk/openai"
-            ? { include: ["reasoning.encrypted_content"], reasoning: { effort: id, summary: "auto" } }
-            : { reasoning_effort: id },
-      })
+const OPENAI_INCLUDE_ENCRYPTED_REASONING = ["reasoning.encrypted_content"]
+
+function reasoningVariants(provider: ModelsDev.Provider, model: ModelsDev.Model): ModelV2Info["variants"] {
+  const npm = model.provider?.npm ?? provider.npm
+  const options = model.reasoning_options ?? []
+  const effort = options.find((option) => option.type === "effort")
+  if (effort?.type === "effort") {
+    return effort.values.flatMap((value) => {
+      const raw: unknown = value
+      const id = raw === null ? "none" : typeof raw === "string" ? raw : undefined
+      if (id === undefined) return []
+      const settings = settingsForEffort(npm, id)
+      return settings ? [{ id, settings, headers: {}, body: {} }] : []
+    })
+  }
+
+  const budget = options.find((option) => option.type === "budget_tokens")
+  if (budget?.type === "budget_tokens") return budgetVariants(npm, budget)
+
+  // Toggle-only reasoning is intentionally left for a follow-up because V1 has
+  // provider/model-specific behavior like MiniMax M3 adaptive thinking and
+  // Qwen/GLM enable_thinking request shapes in packages/opencode.
+  return []
+}
+
+function settingsForEffort(npm: string | undefined, effort: string): ProviderV2.Settings | undefined {
+  if (npm === "@openrouter/ai-sdk-provider") return { reasoning: { effort } }
+  if (npm === "@ai-sdk/anthropic" || npm === "@ai-sdk/google-vertex/anthropic") {
+    return { thinking: { type: "adaptive", display: "summarized" }, effort }
+  }
+  if (npm === "@ai-sdk/google" || npm === "@ai-sdk/google-vertex") {
+    return { thinkingConfig: { includeThoughts: true, thinkingLevel: effort } }
+  }
+  if (npm === "@ai-sdk/azure") return { reasoningEffort: effort }
+  if (npm === "@ai-sdk/openai") {
+    return {
+      reasoningEffort: effort,
+      reasoningSummary: "auto",
+      include: OPENAI_INCLUDE_ENCRYPTED_REASONING,
     }
   }
-  return [...result.values()]
+  if (npm === "@ai-sdk/openai-compatible") return { reasoningEffort: effort }
+}
+
+function budgetVariants(
+  npm: string | undefined,
+  option: Extract<NonNullable<ModelsDev.Model["reasoning_options"]>[number], { type: "budget_tokens" }>,
+): ModelV2Info["variants"] {
+  const max = option.max
+  const high = option.max === undefined ? Math.max(option.min ?? 0, 16_000) : Math.min(Math.max(option.min ?? 0, 16_000), option.max)
+  return [
+    { id: "high", budget: high },
+    ...(max === undefined || max === high ? [] : [{ id: "max", budget: max }]),
+  ].flatMap((item) => {
+    const settings = settingsForBudget(npm, item.budget)
+    return settings ? [{ id: item.id, settings, headers: {}, body: {} }] : []
+  })
+}
+
+function settingsForBudget(npm: string | undefined, budget: number): ProviderV2.Settings | undefined {
+  if (npm === "@openrouter/ai-sdk-provider") return { reasoning: { max_tokens: budget } }
+  if (npm === "@ai-sdk/anthropic" || npm === "@ai-sdk/google-vertex/anthropic") {
+    return { thinking: { type: "enabled", budgetTokens: budget } }
+  }
+  if (npm === "@ai-sdk/google" || npm === "@ai-sdk/google-vertex") {
+    return { thinkingConfig: { includeThoughts: true, thinkingBudget: budget } }
+  }
 }
 
 function modeName(model: ModelsDev.Model, mode: string) {
@@ -193,7 +241,7 @@ export const ModelsDevPlugin = define({
 
           for (const model of Object.values(item.models)) {
             const baseCost = cost(model.cost)
-            const variants = reasoningVariants(model, model.provider?.npm ?? item.npm)
+            const variants = reasoningVariants(item, model)
             catalog.model.update(providerID, model.id, (draft) => applyModel(draft, model, { cost: baseCost, variants }))
             for (const [mode, options] of Object.entries(model.experimental?.modes ?? {})) {
               catalog.model.update(providerID, `${model.id}-${mode}`, (draft) =>

packages/core/src/plugin/provider/openai-codex.ts

@@ -0,0 +1,42 @@
+export * as OpenAICodex from "./openai-codex"
+
+// TEMPORARY SEAM (#34765): plugins have no hook into LLM route construction, so
+// codex routing lives in SessionRunnerModel.fromCatalogModel and catalog filtering
+// in OpenAIPlugin, sharing this module. Once the native provider packages land
+// (#33689/#33925/#34462) this should collapse into the native OpenAI provider.
+// The eligibility rules mirror V1's CodexAuthPlugin allowlist; models.dev has no
+// plan-eligibility data for OpenAI today, but models other vendors' subscriptions
+// as dedicated providers (e.g. zai-coding-plan) - a future openai-chatgpt-plan
+// provider entry could replace the hardcoded rules with catalog data.
+
+/** ChatGPT-plan requests must target the codex backend instead of the public API. */
+export const baseURL = "https://chatgpt.com/backend-api/codex"
+
+const methodIDs: readonly string[] = ["chatgpt-browser", "chatgpt-headless"]
+
+/** Structural credential shape so both core and plugin-facing credential types fit. */
+type CredentialLike = {
+  readonly type: string
+  readonly methodID?: string
+  readonly metadata?: Record<string, unknown> | undefined
+}
+
+export const isChatGPT = (credential: CredentialLike | undefined) =>
+  credential?.type === "oauth" && credential.methodID !== undefined && methodIDs.includes(credential.methodID)
+
+export const accountID = (credential: CredentialLike | undefined) => {
+  if (!isChatGPT(credential)) return undefined
+  const value = credential?.metadata?.accountID
+  return typeof value === "string" ? value : undefined
+}
+
+const allowed = new Set(["gpt-5.5", "gpt-5.3-codex-spark", "gpt-5.4", "gpt-5.4-mini"])
+const disallowed = new Set(["gpt-5.5-pro"])
+
+/** Which API model ids a ChatGPT subscription may call through the codex backend. */
+export const eligible = (apiID: string) => {
+  if (allowed.has(apiID)) return true
+  if (disallowed.has(apiID)) return false
+  const match = apiID.match(/^gpt-(\d+\.\d+)/)
+  return match ? Number.parseFloat(match[1]) > 5.4 : false
+}

packages/core/src/plugin/provider/openai.ts

@@ -1,15 +1,17 @@
 import { createServer } from "node:http"
 import type { IntegrationOAuthMethodRegistration } from "@opencode-ai/plugin/v2/effect/integration"
 import { define } from "@opencode-ai/plugin/v2/effect/plugin"
-import { Deferred, Effect } from "effect"
+import { Deferred, Effect, Semaphore, Stream } from "effect"
 import type { Scope } from "effect"
 import { Credential } from "../../credential"
+import { EventV2 } from "../../event"
 import { InstallationVersion } from "../../installation/version"
 import { Integration } from "../../integration"
 import { ModelV2 } from "../../model"
 import { OauthCallbackPage } from "../../oauth/page"
 import { ProviderV2 } from "../../provider"
 import type { PluginInternal } from "../internal"
+import { OpenAICodex } from "./openai-codex"
 
 const clientID = "app_EMoamEEZ73f0CkXaXp7hrann"
 const issuer = "https://auth.openai.com"
@@ -154,6 +156,18 @@ const headless = {
 export const OpenAIPlugin = define({
   id: "openai",
   effect: Effect.fn(function* (ctx) {
+    const events = yield* EventV2.Service
+    const loading = Semaphore.makeUnsafe(1)
+    let chatgpt = false
+
+    const load = Effect.fn("OpenAIPlugin.load")(function* () {
+      const connection = yield* ctx.integration.connection.active("openai")
+      const credential = connection
+        ? yield* ctx.integration.connection.resolve(connection).pipe(Effect.catch(() => Effect.succeed(undefined)))
+        : undefined
+      chatgpt = OpenAICodex.isChatGPT(credential)
+    })
+
     yield* ctx.integration.transform((draft) => {
       draft.method.update(browser)
       draft.method.update(headless)
@@ -170,8 +184,30 @@ export const OpenAIPlugin = define({
             model.enabled = false
           })
         }
+        if (!chatgpt) return
+        const item = evt.provider.get(ProviderV2.ID.openai)
+        if (!item) return
+        for (const model of item.models.values()) {
+          // ChatGPT-plan tokens only authorize codex-eligible models, and the
+          // subscription covers usage, so hide the rest and zero the cost.
+          evt.model.update(item.provider.id, model.id, (draft) => {
+            if (!OpenAICodex.eligible(draft.api.id)) {
+              draft.enabled = false
+              return
+            }
+            draft.cost = []
+          })
+        }
       }),
     )
+
+    const refresh = () => loading.withPermit(load().pipe(Effect.andThen(ctx.catalog.reload())))
+    yield* events.subscribe(Integration.Event.ConnectionUpdated).pipe(
+      Stream.filter((event) => event.data.integrationID === Integration.ID.make("openai")),
+      Stream.runForEach(refresh),
+      Effect.forkScoped({ startImmediately: true }),
+    )
+    yield* refresh().pipe(Effect.forkScoped)
     yield* ctx.aisdk.sdk(
       Effect.fn(function* (evt) {
         if (evt.package !== "@ai-sdk/openai") return

packages/core/src/plugin/provider/opencode.ts

@@ -146,7 +146,7 @@ export const OpencodePlugin = define<HttpClient.HttpClient | EventV2.Service | S
                 const variantID = ModelV2.VariantID.make(id)
                 let existing = model.variants.find((item) => item.id === variantID)
                 if (!existing) {
-                  existing = { id: variantID, headers: {}, body: {} }
+                  existing = { id: variantID, settings: {}, headers: {}, body: {} }
                   model.variants.push(existing)
                 }
                 Object.assign(existing.headers, options.headers)

packages/core/src/plugin/runtime.ts

@@ -110,8 +110,13 @@ export const providerLayer = providerLayerWithCell(defaultCell)
 
 export const node = makeGlobalNode({ service: Service, layer, deps: [] })
 
-export const providerNode = makeGlobalNode({
-  name: "plugin-runtime-provider",
-  layer: providerLayer,
-  deps: [node, SessionV2.node, Job.node, LocationServiceMap.node],
-})
+// Raw layer replacements are compiled without dependencies, so cell-scoped
+// provider replacements must go through this node to keep their deps wired.
+export const providerNodeWithCell = (cell: Cell) =>
+  makeGlobalNode({
+    name: "plugin-runtime-provider",
+    layer: providerLayerWithCell(cell),
+    deps: [node, SessionV2.node, Job.node, LocationServiceMap.node],
+  })
+
+export const providerNode = providerNodeWithCell(defaultCell)

packages/core/src/plugin/variant.ts

@@ -33,7 +33,8 @@ export function generate(model: ModelV2Info): ModelV2Info["variants"] {
   if (!["glm-5.2", "glm-5-2", "glm-5p2"].some((name) => ids.includes(name))) return []
   return ["high", "max"].map((id) => ({
     id,
+    settings: { reasoningEffort: id },
     headers: {},
-    body: { reasoning_effort: id },
+    body: {},
   }))
 }

packages/core/src/provider.ts

@@ -19,7 +19,15 @@ export type MutableApi<T extends Api = Api> = T extends Api
 export const Request = Provider.Request
 export type Request = Provider.Request
 
+export const Settings = Provider.Settings
+export type Settings = Provider.Settings
+
 export const Info = Provider.Info
 export type Info = Provider.Info
 
-export type MutableInfo = Omit<Types.DeepMutable<Info>, "api"> & { api: MutableApi }
+export type MutableRequest = Types.DeepMutable<Request>
+
+export type MutableInfo = Omit<Types.DeepMutable<Info>, "api" | "request"> & {
+  api: MutableApi
+  request: MutableRequest
+}

packages/core/src/reference/guidance.ts

@@ -11,20 +11,48 @@ const Summary = Schema.Struct({
   description: Schema.String.pipe(Schema.optional),
 })
 
+const entries = (references: ReadonlyArray<typeof Summary.Type>) =>
+  references.flatMap((reference) => [
+    "  <reference>",
+    `    <name>${reference.name}</name>`,
+    `    <path>${reference.path}</path>`,
+    ...(reference.description === undefined ? [] : [`    <description>${reference.description}</description>`]),
+    "  </reference>",
+  ])
+
 const render = (references: ReadonlyArray<typeof Summary.Type>) =>
   [
     "Project references provide additional directories that can be accessed when relevant.",
     "<available_references>",
-    ...references.flatMap((reference) => [
-      "  <reference>",
-      `    <name>${reference.name}</name>`,
-      `    <path>${reference.path}</path>`,
-      ...(reference.description === undefined ? [] : [`    <description>${reference.description}</description>`]),
-      "  </reference>",
-    ]),
+    ...entries(references),
     "</available_references>",
   ].join("\n")
 
+const update = (previous: ReadonlyArray<typeof Summary.Type>, current: ReadonlyArray<typeof Summary.Type>) => {
+  const diff = SystemContext.diffByKey(
+    previous,
+    current,
+    (reference) => reference.name,
+    (before, after) => before.path !== after.path || before.description !== after.description,
+  )
+  // Additions and removals render as small deltas; anything else restates the full list.
+  if (diff.changed.length > 0 || (diff.added.length === 0 && diff.removed.length === 0))
+    return [
+      "The available project references have changed. This list supersedes the previous reference list.",
+      render(current),
+    ].join("\n")
+  return [
+    ...(diff.added.length === 0
+      ? []
+      : ["New project references are available in addition to those previously listed:", ...entries(diff.added)]),
+    ...(diff.removed.length === 0
+      ? []
+      : [
+          `The following project references are no longer available and must not be used: ${diff.removed.map((reference) => reference.name).join(", ")}.`,
+        ]),
+  ].join("\n")
+}
+
 export interface Interface {
   readonly load: () => Effect.Effect<SystemContext.SystemContext>
 }
@@ -52,11 +80,7 @@ const layer = Layer.effect(
           codec: Schema.toCodecJson(Schema.Array(Summary)),
           load: Effect.succeed(available),
           baseline: render,
-          update: (_previous, current) =>
-            [
-              "The available project references have changed. This list supersedes the previous reference list.",
-              render(current),
-            ].join("\n"),
+          update,
           removed: () => "Project reference guidance is no longer available. Do not use previously listed references.",
         })
       }),

packages/core/src/session.ts

@@ -108,7 +108,7 @@ export class OperationUnavailableError extends Schema.TaggedErrorClass<Operation
   },
 ) {}
 
-export { ContextSnapshotDecodeError, MessageDecodeError } from "./session/error"
+export { MessageDecodeError } from "./session/error"
 
 export class PromptConflictError extends Schema.TaggedErrorClass<PromptConflictError>()("Session.PromptConflictError", {
   sessionID: SessionSchema.ID,
@@ -199,6 +199,7 @@ export interface Interface {
     sessionID: SessionSchema.ID
     text: string
     description?: string
+    metadata?: Record<string, unknown>
   }) => Effect.Effect<void, NotFoundError>
   readonly revert: {
     readonly stage: (input: {
@@ -465,7 +466,9 @@ const layer = Layer.effect(
           text: skill.content,
         })
         if (input.resume !== false)
-          yield* execution.resume(input.sessionID).pipe(Effect.ignore, Effect.forkIn(scope, { startImmediately: true }), Effect.asVoid)
+          yield* execution
+            .resume(input.sessionID)
+            .pipe(Effect.ignore, Effect.forkIn(scope, { startImmediately: true }), Effect.asVoid)
       }),
       switchAgent: Effect.fn("V2Session.switchAgent")(function* (input) {
         yield* result.get(input.sessionID)
@@ -547,8 +550,11 @@ const layer = Layer.effect(
           timestamp: yield* DateTime.now,
           text: input.text,
           description: input.description,
+          metadata: input.metadata,
         })
-        yield* execution.resume(input.sessionID).pipe(Effect.ignore, Effect.forkIn(scope, { startImmediately: true }), Effect.asVoid)
+        yield* execution
+          .resume(input.sessionID)
+          .pipe(Effect.ignore, Effect.forkIn(scope, { startImmediately: true }), Effect.asVoid)
       }),
       interrupt: Effect.fn("V2Session.interrupt")((sessionID) =>
         Effect.uninterruptible(execution.interrupt(sessionID)),

packages/core/src/session/context-checkpoint.ts

@@ -0,0 +1,131 @@
+export * as SessionContextCheckpoint from "./context-checkpoint"
+
+import { eq } from "drizzle-orm"
+import { DateTime, Effect, Option, Schema } from "effect"
+import type { Database } from "../database/database"
+import { EventV2 } from "../event"
+import { SystemContext } from "../system-context/index"
+import { SessionEvent } from "./event"
+import { SessionHistory } from "./history"
+import { SessionMessage } from "./message"
+import { SessionSchema } from "./schema"
+import { SessionContextCheckpointTable } from "./sql"
+
+type DatabaseService = Database.Interface["db"]
+
+const decodeApplied = Schema.decodeUnknownOption(SystemContext.Applied)
+
+/**
+ * Loads or creates the session's durable context checkpoint, narrating any
+ * drift since the model was last told as a chronological update. Completed
+ * compaction rebaselines; nothing else rewrites the baseline. Runs before
+ * input promotion so a blocked first turn leaves pending inputs untouched.
+ */
+export const prepare = Effect.fn("SessionContextCheckpoint.prepare")(function* (
+  db: DatabaseService,
+  events: EventV2.Interface,
+  context: Effect.Effect<SystemContext.SystemContext>,
+  sessionID: SessionSchema.ID,
+) {
+  const [value, stored, compaction] = yield* Effect.all(
+    [context, find(db, sessionID), SessionHistory.latestCompaction(db, sessionID)],
+    { concurrency: "unbounded" },
+  )
+  if (!stored) {
+    const baseline = yield* SystemContext.initialize(value)
+    const baselineSeq = yield* insert(db, sessionID, baseline)
+    return { baseline: baseline.text, baselineSeq }
+  }
+
+  // The applied record is comparison state only; an undecodable one heals by
+  // treating every source as new, re-announcing baselines as updates.
+  const applied = Option.getOrElse(decodeApplied(stored.snapshot), () => ({}))
+  if (compaction !== undefined && compaction.seq > stored.baseline_seq) {
+    const baseline = yield* SystemContext.rebaseline(value, applied)
+    yield* rewrite(db, sessionID, compaction.seq, baseline)
+    return { baseline: baseline.text, baselineSeq: compaction.seq }
+  }
+  const result = yield* SystemContext.reconcile(value, applied)
+  if (result._tag === "Unchanged") return { baseline: stored.baseline, baselineSeq: stored.baseline_seq }
+
+  yield* events.publish(
+    SessionEvent.ContextUpdated,
+    { sessionID, messageID: SessionMessage.ID.create(), timestamp: yield* DateTime.now, text: result.text },
+    { commit: () => advance(db, sessionID, result.applied).pipe(Effect.orDie) },
+  )
+  return { baseline: stored.baseline, baselineSeq: stored.baseline_seq }
+})
+
+export const reset = Effect.fn("SessionContextCheckpoint.reset")(function* (
+  db: DatabaseService,
+  sessionID: SessionSchema.ID,
+) {
+  yield* db
+    .delete(SessionContextCheckpointTable)
+    .where(eq(SessionContextCheckpointTable.session_id, sessionID))
+    .run()
+    .pipe(Effect.orDie)
+})
+
+const find = Effect.fnUntraced(function* (db: DatabaseService, sessionID: SessionSchema.ID) {
+  return yield* db
+    .select()
+    .from(SessionContextCheckpointTable)
+    .where(eq(SessionContextCheckpointTable.session_id, sessionID))
+    .get()
+    .pipe(Effect.orDie)
+})
+
+const insert = Effect.fnUntraced(function* (
+  db: DatabaseService,
+  sessionID: SessionSchema.ID,
+  baseline: SystemContext.Baseline,
+) {
+  const baselineSeq = yield* EventV2.latestSequence(db, sessionID)
+  yield* db
+    .insert(SessionContextCheckpointTable)
+    .values({
+      session_id: sessionID,
+      baseline: baseline.text,
+      snapshot: baseline.applied,
+      baseline_seq: baselineSeq,
+    })
+    .run()
+    .pipe(Effect.orDie)
+  return baselineSeq
+})
+
+const rewrite = Effect.fnUntraced(function* (
+  db: DatabaseService,
+  sessionID: SessionSchema.ID,
+  baselineSeq: number,
+  baseline: SystemContext.Baseline,
+) {
+  const updated = yield* db
+    .update(SessionContextCheckpointTable)
+    .set({
+      baseline: baseline.text,
+      snapshot: baseline.applied,
+      baseline_seq: baselineSeq,
+    })
+    .where(eq(SessionContextCheckpointTable.session_id, sessionID))
+    .returning({ sessionID: SessionContextCheckpointTable.session_id })
+    .get()
+    .pipe(Effect.orDie)
+  if (!updated) return yield* Effect.die("Context checkpoint not found")
+})
+
+const advance = Effect.fnUntraced(function* (
+  db: DatabaseService,
+  sessionID: SessionSchema.ID,
+  applied: SystemContext.Applied,
+) {
+  const updated = yield* db
+    .update(SessionContextCheckpointTable)
+    .set({ snapshot: applied })
+    .where(eq(SessionContextCheckpointTable.session_id, sessionID))
+    .returning({ sessionID: SessionContextCheckpointTable.session_id })
+    .get()
+    .pipe(Effect.orDie)
+  if (!updated) return yield* Effect.die("Context checkpoint not found")
+})

packages/core/src/session/context-entry.ts

@@ -0,0 +1,106 @@
+export * as SessionContextEntry from "./context-entry"
+
+import { and, asc, eq } from "drizzle-orm"
+import { Context, Effect, Layer, Schema } from "effect"
+import { SessionContextEntry } from "@opencode-ai/schema/session-context-entry"
+import { Database } from "../database/database"
+import { makeLocationNode } from "../effect/app-node"
+import { SystemContext } from "../system-context/index"
+import { SessionSchema } from "./schema"
+import { SessionContextEntryTable } from "./sql"
+
+export const Key = SessionContextEntry.Key
+export type Key = typeof Key.Type
+export const Info = SessionContextEntry.Info
+export type Info = typeof Info.Type
+
+export interface Interface {
+  readonly list: (sessionID: SessionSchema.ID) => Effect.Effect<ReadonlyArray<Info>>
+  readonly put: (input: {
+    readonly sessionID: SessionSchema.ID
+    readonly key: Key
+    readonly value: Schema.Json
+  }) => Effect.Effect<void>
+  readonly remove: (input: { readonly sessionID: SessionSchema.ID; readonly key: Key }) => Effect.Effect<void>
+  /** Produces one SystemContext source per stored entry, keyed `api/<key>`. */
+  readonly load: (sessionID: SessionSchema.ID) => Effect.Effect<SystemContext.SystemContext>
+}
+
+export class Service extends Context.Service<Service, Interface>()("@opencode/v2/SessionContextEntry") {}
+
+const renderValue = (value: Schema.Json) => (typeof value === "string" ? value : JSON.stringify(value, null, 2))
+
+const renderBlock = (key: Key, value: Schema.Json) =>
+  [`<context key="${key}">`, renderValue(value), "</context>"].join("\n")
+
+// Rendering stays mechanism-neutral: the model sees session context, not how
+// it was attached. Only chronological updates and removals carry narration.
+const source = (entry: Info) =>
+  SystemContext.make({
+    key: SystemContext.Key.make(`api/${entry.key}`),
+    codec: Schema.toCodecJson(Schema.Json),
+    load: Effect.succeed(entry.value),
+    baseline: (value) => renderBlock(entry.key, value),
+    update: (_previous, value) =>
+      [
+        `The context under "${entry.key}" changed and supersedes the previous value:`,
+        renderBlock(entry.key, value),
+      ].join("\n"),
+    removed: () => `The context under "${entry.key}" no longer applies. Disregard it.`,
+  })
+
+const layer = Layer.effect(
+  Service,
+  Effect.gen(function* () {
+    const { db } = yield* Database.Service
+
+    const list = Effect.fn("SessionContextEntry.list")(function* (sessionID: SessionSchema.ID) {
+      const rows = yield* db
+        .select()
+        .from(SessionContextEntryTable)
+        .where(eq(SessionContextEntryTable.session_id, sessionID))
+        .orderBy(asc(SessionContextEntryTable.key))
+        .all()
+        .pipe(Effect.orDie)
+      return rows.map((row) => ({ key: row.key, value: row.value }))
+    })
+
+    const put = Effect.fn("SessionContextEntry.put")(function* (input: {
+      readonly sessionID: SessionSchema.ID
+      readonly key: Key
+      readonly value: Schema.Json
+    }) {
+      yield* db
+        .insert(SessionContextEntryTable)
+        .values({ session_id: input.sessionID, key: input.key, value: input.value })
+        .onConflictDoUpdate({
+          target: [SessionContextEntryTable.session_id, SessionContextEntryTable.key],
+          set: { value: input.value, time_updated: Date.now() },
+        })
+        .run()
+        .pipe(Effect.orDie)
+    })
+
+    const remove = Effect.fn("SessionContextEntry.remove")(function* (input: {
+      readonly sessionID: SessionSchema.ID
+      readonly key: Key
+    }) {
+      yield* db
+        .delete(SessionContextEntryTable)
+        .where(
+          and(eq(SessionContextEntryTable.session_id, input.sessionID), eq(SessionContextEntryTable.key, input.key)),
+        )
+        .run()
+        .pipe(Effect.orDie)
+    })
+
+    const load = Effect.fn("SessionContextEntry.load")(function* (sessionID: SessionSchema.ID) {
+      const entries = yield* list(sessionID)
+      return SystemContext.combine(entries.map(source))
+    })
+
+    return Service.of({ list, put, remove, load })
+  }),
+)
+
+export const node = makeLocationNode({ service: Service, layer, deps: [Database.node] })

packages/core/src/session/context-epoch.ts

@@ -1,174 +0,0 @@
-export * as SessionContextEpoch from "./context-epoch"
-
-import { eq } from "drizzle-orm"
-import { DateTime, Effect, Schema } from "effect"
-import type { Database } from "../database/database"
-import { EventV2 } from "../event"
-import { SystemContext } from "../system-context/index"
-import { ContextSnapshotDecodeError } from "./error"
-import { SessionEvent } from "./event"
-import { SessionHistory } from "./history"
-import { SessionInput } from "./input"
-import { SessionMessage } from "./message"
-import { SessionSchema } from "./schema"
-import { SessionContextEpochTable } from "./sql"
-
-type DatabaseService = Database.Interface["db"]
-
-interface Prepared {
-  readonly baseline: string
-  readonly baselineSeq: number
-}
-
-export function initialize(
-  db: DatabaseService,
-  context: Effect.Effect<SystemContext.SystemContext>,
-  sessionID: SessionSchema.ID,
-): Effect.Effect<Prepared | undefined, SystemContext.InitializationBlocked> {
-  return initializeOnce(db, context, sessionID).pipe(Effect.withSpan("SessionContextEpoch.initialize"))
-}
-
-export function prepare(
-  db: DatabaseService,
-  events: EventV2.Interface,
-  context: Effect.Effect<SystemContext.SystemContext>,
-  sessionID: SessionSchema.ID,
-): Effect.Effect<Prepared, SystemContext.InitializationBlocked | ContextSnapshotDecodeError> {
-  return prepareOnce(db, events, context, sessionID).pipe(Effect.withSpan("SessionContextEpoch.prepare"))
-}
-
-const prepareOnce = Effect.fnUntraced(function* (
-  db: DatabaseService,
-  events: EventV2.Interface,
-  context: Effect.Effect<SystemContext.SystemContext>,
-  sessionID: SessionSchema.ID,
-) {
-  const [value, stored, compaction] = yield* Effect.all(
-    [context, find(db, sessionID), SessionHistory.latestCompaction(db, sessionID)],
-    { concurrency: "unbounded" },
-  )
-  if (!stored) {
-    const generation = yield* SystemContext.initialize(value)
-    const baselineSeq = yield* insert(db, sessionID, generation)
-    return { baseline: generation.baseline, baselineSeq }
-  }
-
-  const snapshot = yield* Schema.decodeUnknownEffect(SystemContext.Snapshot)(stored.snapshot).pipe(
-    Effect.mapError((error) => new ContextSnapshotDecodeError({ sessionID, details: String(error) })),
-  )
-  const replacementSeq = compaction !== undefined && compaction.seq > stored.baseline_seq ? compaction.seq : undefined
-  const result = replacementSeq
-    ? yield* SystemContext.replace(value, snapshot)
-    : yield* SystemContext.reconcile(value, snapshot)
-  if (result._tag === "Unchanged" || result._tag === "ReplacementBlocked") {
-    return { baseline: stored.baseline, baselineSeq: stored.baseline_seq }
-  }
-  if (result._tag === "ReplacementReady") {
-    const baselineSeq = replacementSeq ?? (yield* EventV2.latestSequence(db, sessionID))
-    yield* replace(db, sessionID, baselineSeq, result.generation)
-    return { baseline: result.generation.baseline, baselineSeq }
-  }
-
-  yield* events.publish(
-    SessionEvent.ContextUpdated,
-    { sessionID, messageID: SessionMessage.ID.create(), timestamp: yield* DateTime.now, text: result.text },
-    { commit: () => advance(db, sessionID, result.snapshot).pipe(Effect.orDie) },
-  )
-  return { baseline: stored.baseline, baselineSeq: stored.baseline_seq }
-})
-
-const initializeOnce = Effect.fnUntraced(function* (
-  db: DatabaseService,
-  context: Effect.Effect<SystemContext.SystemContext>,
-  sessionID: SessionSchema.ID,
-) {
-  if (yield* exists(db, sessionID)) return
-  const generation = yield* context.pipe(Effect.flatMap(SystemContext.initialize))
-  const baselineSeq = yield* insert(db, sessionID, generation)
-  return { baseline: generation.baseline, baselineSeq }
-})
-
-const exists = Effect.fn("SessionContextEpoch.exists")(function* (db: DatabaseService, sessionID: SessionSchema.ID) {
-  return (
-    (yield* db
-      .select({ sessionID: SessionContextEpochTable.session_id })
-      .from(SessionContextEpochTable)
-      .where(eq(SessionContextEpochTable.session_id, sessionID))
-      .get()
-      .pipe(Effect.orDie)) !== undefined
-  )
-})
-
-const find = Effect.fn("SessionContextEpoch.find")(function* (db: DatabaseService, sessionID: SessionSchema.ID) {
-  return yield* db
-    .select()
-    .from(SessionContextEpochTable)
-    .where(eq(SessionContextEpochTable.session_id, sessionID))
-    .get()
-    .pipe(Effect.orDie)
-})
-
-export const reset = Effect.fn("SessionContextEpoch.reset")(function* (
-  db: DatabaseService,
-  sessionID: SessionSchema.ID,
-) {
-  yield* db
-    .delete(SessionContextEpochTable)
-    .where(eq(SessionContextEpochTable.session_id, sessionID))
-    .run()
-    .pipe(Effect.orDie)
-})
-
-const insert = Effect.fnUntraced(function* (
-  db: DatabaseService,
-  sessionID: SessionSchema.ID,
-  generation: SystemContext.Generation,
-) {
-  const baselineSeq = yield* EventV2.latestSequence(db, sessionID)
-  yield* db
-    .insert(SessionContextEpochTable)
-    .values({
-      session_id: sessionID,
-      baseline: generation.baseline,
-      snapshot: generation.snapshot,
-      baseline_seq: baselineSeq,
-    })
-    .run()
-    .pipe(Effect.orDie)
-  return baselineSeq
-})
-
-const replace = Effect.fnUntraced(function* (
-  db: DatabaseService,
-  sessionID: SessionSchema.ID,
-  baselineSeq: number,
-  generation: SystemContext.Generation,
-) {
-  const updated = yield* db
-    .update(SessionContextEpochTable)
-    .set({
-      baseline: generation.baseline,
-      snapshot: generation.snapshot,
-      baseline_seq: baselineSeq,
-    })
-    .where(eq(SessionContextEpochTable.session_id, sessionID))
-    .returning({ sessionID: SessionContextEpochTable.session_id })
-    .get()
-    .pipe(Effect.orDie)
-  if (!updated) return yield* Effect.die("Context Epoch not found")
-})
-
-const advance = Effect.fnUntraced(function* (
-  db: DatabaseService,
-  sessionID: SessionSchema.ID,
-  snapshot: SystemContext.Snapshot,
-) {
-  const updated = yield* db
-    .update(SessionContextEpochTable)
-    .set({ snapshot })
-    .where(eq(SessionContextEpochTable.session_id, sessionID))
-    .returning({ sessionID: SessionContextEpochTable.session_id })
-    .get()
-    .pipe(Effect.orDie)
-  if (!updated) return yield* Effect.die("Context Epoch not found")
-})

packages/core/src/session/error.ts

@@ -10,15 +10,3 @@ export class MessageDecodeError extends Schema.TaggedErrorClass<MessageDecodeErr
     return `Failed to decode message ${this.messageID} in session ${this.sessionID}`
   }
 }
-
-export class ContextSnapshotDecodeError extends Schema.TaggedErrorClass<ContextSnapshotDecodeError>()(
-  "Session.ContextSnapshotDecodeError",
-  {
-    sessionID: SessionSchema.ID,
-    details: Schema.String,
-  },
-) {
-  override get message() {
-    return `Failed to decode context snapshot for session ${this.sessionID}: ${this.details}`
-  }
-}

packages/core/src/session/history.ts

@@ -4,7 +4,7 @@ import { Database } from "../database/database"
 import { MessageDecodeError } from "./error"
 import { SessionMessage } from "./message"
 import { SessionSchema } from "./schema"
-import { SessionContextEpochTable, SessionMessageTable } from "./sql"
+import { SessionContextCheckpointTable, SessionMessageTable } from "./sql"
 
 type DatabaseService = Database.Interface["db"]
 
@@ -33,6 +33,9 @@ const messageRows = Effect.fnUntraced(function* (
     .where(
       and(
         eq(SessionMessageTable.session_id, sessionID),
+        // Keep system updates visible in the gap between a completed compaction
+        // and the next prepared turn's rebaseline, when their content is not yet
+        // folded into a new baseline.
         compaction
           ? or(
               gte(SessionMessageTable.seq, compaction.seq),
@@ -67,9 +70,9 @@ export const load = Effect.fn("SessionHistory.load")(function* (db: DatabaseServ
   const [epoch, compaction] = yield* Effect.all(
     [
       db
-        .select({ baselineSeq: SessionContextEpochTable.baseline_seq })
-        .from(SessionContextEpochTable)
-        .where(eq(SessionContextEpochTable.session_id, sessionID))
+        .select({ baselineSeq: SessionContextCheckpointTable.baseline_seq })
+        .from(SessionContextCheckpointTable)
+        .where(eq(SessionContextCheckpointTable.session_id, sessionID))
         .get()
         .pipe(Effect.orDie),
       latestCompaction(db, sessionID),
@@ -79,14 +82,6 @@ export const load = Effect.fn("SessionHistory.load")(function* (db: DatabaseServ
   return yield* Effect.forEach(yield* messageRows(db, sessionID, compaction, epoch?.baselineSeq), decodeMessageRow)
 })
 
-export const loadForRunner = Effect.fn("SessionHistory.loadForRunner")(function* (
-  db: DatabaseService,
-  sessionID: SessionSchema.ID,
-  baselineSeq: number,
-) {
-  return (yield* entriesForRunner(db, sessionID, baselineSeq)).map((entry) => entry.message)
-})
-
 export const entriesForRunner = Effect.fn("SessionHistory.entriesForRunner")(function* (
   db: DatabaseService,
   sessionID: SessionSchema.ID,

packages/core/src/session/instructions.ts

@@ -0,0 +1,115 @@
+export * as SessionInstructions from "./instructions"
+
+import { relative } from "path"
+import { Context, DateTime, Effect, Layer, Option, Ref, Schema } from "effect"
+import { makeLocationNode } from "../effect/app-node"
+import { EventV2 } from "../event"
+import { FSUtil } from "../fs-util"
+import { Location } from "../location"
+import { SessionEvent } from "./event"
+import { MessageDecodeError } from "./error"
+import { SessionMessage } from "./message"
+import { SessionSchema } from "./schema"
+import { SessionStore } from "./store"
+
+const InjectedMetadata = Schema.Struct({
+  instruction: Schema.Struct({ paths: Schema.Array(Schema.String) }),
+})
+
+export interface Interface {
+  readonly load: (input: {
+    readonly sessionID: SessionSchema.ID
+    readonly paths: ReadonlyArray<string>
+  }) => Effect.Effect<void, MessageDecodeError | FSUtil.Error>
+}
+
+export class Service extends Context.Service<Service, Interface>()("@opencode/v2/SessionInstructions") {}
+
+const layer = Layer.effect(
+  Service,
+  Effect.gen(function* () {
+    const events = yield* EventV2.Service
+    const fs = yield* FSUtil.Service
+    const store = yield* SessionStore.Service
+    const location = yield* Location.Service
+    // Resolved once for the Location layer; the synthetic text and dedup ledger keep
+    // absolute paths, but the human-facing description shows paths relative to the project
+    // root so opening a subdirectory still describes paths from the project root.
+    const root = FSUtil.resolve(location.project.directory)
+    // Same-turn parallel reads settle concurrently, so an in-memory claim guards each
+    // Session/path pair before any filesystem work. The durable history check below covers
+    // paths injected in earlier turns after this Location layer was reopened.
+    const injected = yield* Ref.make<Map<SessionSchema.ID, Set<string>>>(new Map())
+
+    const load = Effect.fn("SessionInstructions.load")(function* (input: {
+      readonly sessionID: SessionSchema.ID
+      readonly paths: ReadonlyArray<string>
+    }) {
+      const claimed = yield* Ref.modify(injected, (map) => {
+        const existing = map.get(input.sessionID) ?? new Set<string>()
+        const newlyClaimed = input.paths.filter((path) => !existing.has(path))
+        if (newlyClaimed.length === 0) return [newlyClaimed, map]
+        const next = new Map(map)
+        next.set(input.sessionID, new Set([...existing, ...newlyClaimed]))
+        return [newlyClaimed, next]
+      })
+      if (claimed.length === 0) return
+      const alreadyInjected = yield* previouslyInjected(store, input.sessionID)
+      const toInject = claimed.filter((path) => !alreadyInjected.has(path))
+      if (toInject.length === 0) return
+      const files = yield* Effect.forEach(
+        toInject,
+        (path) =>
+          fs.readFileStringSafe(path).pipe(
+            Effect.map((content) => (content === undefined ? undefined : { path, content })),
+          ),
+        { concurrency: "unbounded" },
+      )
+      const readable = files.filter((file): file is { path: string; content: string } => file !== undefined)
+      if (readable.length === 0) return
+      // Publish directly rather than through SessionV2.synthetic: a Location-scoped layer
+      // cannot depend on SessionV2 (it routes through LocationServiceMap, forming a type
+      // cycle with this node). The durable publish is what makes the synthetic visible on
+      // the next projected history reload. The dedup ledger lives on the synthetic message
+      // metadata so it survives across Location layer restarts.
+      yield* events.publish(SessionEvent.Synthetic, {
+        sessionID: input.sessionID,
+        messageID: SessionMessage.ID.create(),
+        timestamp: yield* DateTime.now,
+        text: readable.map((file) => `Instructions from: ${file.path}\n${file.content}`).join("\n\n"),
+        description: `Loaded ${readable.map((file) => describePath(root, file.path)).join(", ")}`,
+        metadata: { instruction: { paths: readable.map((file) => file.path) } },
+      })
+    })
+
+    return Service.of({ load })
+  }),
+)
+
+function previouslyInjected(store: SessionStore.Interface, sessionID: SessionSchema.ID) {
+  return Effect.gen(function* () {
+    const history = yield* store.context(sessionID)
+    return new Set(
+      history
+        .filter((message): message is SessionMessage.Synthetic => message.type === "synthetic")
+        .flatMap(
+          (message) =>
+            Option.getOrUndefined(Schema.decodeUnknownOption(InjectedMetadata)(message.metadata))?.instruction.paths ??
+            [],
+        ),
+    )
+  })
+}
+
+// Paths are normally discovered under the project root, so the description shows them
+// relative to it. A directly-loaded path outside the root falls back to its absolute form
+// rather than emitting `../..` chains.
+function describePath(root: string, path: string) {
+  return FSUtil.contains(root, path) ? relative(root, path) : path
+}
+
+export const node = makeLocationNode({
+  name: "session-instructions",
+  layer,
+  deps: [EventV2.node, FSUtil.node, Location.node, SessionStore.node],
+})

packages/core/src/session/message-updater.ts

@@ -139,6 +139,7 @@ export function update(adapter: Adapter, event: SessionEvent.Event) {
         )
       },
       "session.next.prompt.admitted": () => Effect.void,
+      "session.next.execution.settled": () => Effect.void,
       "session.next.context.updated": (event) =>
         adapter.appendMessage(
           SessionMessage.System.make({
@@ -154,6 +155,7 @@ export function update(adapter: Adapter, event: SessionEvent.Event) {
             sessionID: event.data.sessionID,
             text: event.data.text,
             description: event.data.description,
+            metadata: event.data.metadata,
             id: event.data.messageID,
             type: "synthetic",
             time: { created: event.data.timestamp },

packages/core/src/session/projector.ts

@@ -12,8 +12,15 @@ import { SessionMessage } from "./message"
 import { SessionMessageUpdater } from "./message-updater"
 import { SessionInput } from "./input"
 import { WorkspaceV2 } from "../workspace"
-import { SessionContextEpoch } from "./context-epoch"
-import { MessageTable, PartTable, SessionInputTable, SessionMessageTable, SessionTable } from "./sql"
+import { SessionContextCheckpoint } from "./context-checkpoint"
+import {
+  MessageTable,
+  PartTable,
+  SessionContextCheckpointTable,
+  SessionInputTable,
+  SessionMessageTable,
+  SessionTable,
+} from "./sql"
 import type { DeepMutable } from "../schema"
 import { Slug } from "../util/slug"
 
@@ -156,12 +163,16 @@ const projectFork = Effect.fn("SessionProjector.projectFork")(function* (
         .select({ seq: SessionMessageTable.seq })
         .from(SessionMessageTable)
         .where(
-          and(eq(SessionMessageTable.session_id, event.data.parentID), eq(SessionMessageTable.id, event.data.messageID)),
+          and(
+            eq(SessionMessageTable.session_id, event.data.parentID),
+            eq(SessionMessageTable.id, event.data.messageID),
+          ),
         )
         .get()
         .pipe(Effect.orDie)
     : undefined
-  if (event.data.messageID && !boundary) return yield* Effect.die(`Fork boundary message not found: ${event.data.messageID}`)
+  if (event.data.messageID && !boundary)
+    return yield* Effect.die(`Fork boundary message not found: ${event.data.messageID}`)
   const copied = yield* db
     .select({ seq: SessionMessageTable.seq })
     .from(SessionMessageTable)
@@ -206,6 +217,23 @@ const projectFork = Effect.fn("SessionProjector.projectFork")(function* (
     .pipe(Effect.orDie)
   if (!stored) return yield* Effect.die(new SessionAlreadyProjected())
 
+  // The fork inherits the parent's transcript, so it inherits the context
+  // checkpoint that transcript was built against: copied message seqs keep
+  // folding at the same baseline horizon.
+  const checkpoint = yield* db
+    .select()
+    .from(SessionContextCheckpointTable)
+    .where(eq(SessionContextCheckpointTable.session_id, event.data.parentID))
+    .get()
+    .pipe(Effect.orDie)
+  if (checkpoint) {
+    yield* db
+      .insert(SessionContextCheckpointTable)
+      .values({ ...checkpoint, session_id: event.data.sessionID })
+      .run()
+      .pipe(Effect.orDie)
+  }
+
   const usage = emptyUsage()
   let cursor = -1
   while (true) {
@@ -452,7 +480,7 @@ const layer = Layer.effectDiscard(
           .where(eq(SessionTable.id, event.data.sessionID))
           .run()
           .pipe(Effect.orDie)
-        yield* SessionContextEpoch.reset(db, event.data.sessionID)
+        yield* SessionContextCheckpoint.reset(db, event.data.sessionID)
       }),
     )
     yield* events.project(SessionV1.Event.Deleted, (event) =>
@@ -666,7 +694,7 @@ const layer = Layer.effectDiscard(
           .where(eq(SessionTable.id, event.data.sessionID))
           .run()
           .pipe(Effect.orDie)
-        yield* SessionContextEpoch.reset(db, event.data.sessionID)
+        yield* SessionContextCheckpoint.reset(db, event.data.sessionID)
       }),
     )
   }),

packages/core/src/session/runner/index.ts

@@ -3,7 +3,7 @@ export * as SessionRunner from "./index"
 import type { LLMError } from "@opencode-ai/llm"
 import { Context, Effect } from "effect"
 import { SessionSchema } from "../schema"
-import type { ContextSnapshotDecodeError, MessageDecodeError } from "../error"
+import type { MessageDecodeError } from "../error"
 import { SessionRunnerModel } from "./model"
 import type { SystemContext } from "../../system-context/index"
 import type { ToolOutputStore } from "../../tool-output-store"
@@ -12,7 +12,6 @@ export type RunError =
   | LLMError
   | SessionRunnerModel.Error
   | MessageDecodeError
-  | ContextSnapshotDecodeError
   | SystemContext.InitializationBlocked
   | ToolOutputStore.Error
 

packages/core/src/session/runner/llm.ts

@@ -8,7 +8,7 @@ import {
   isContextOverflowFailure,
   type ProviderErrorEvent,
 } from "@opencode-ai/llm"
-import { Cause, DateTime, Effect, FiberSet, Layer, Option, Semaphore, Stream } from "effect"
+import { Cause, DateTime, Effect, Exit, FiberSet, Layer, Option, Semaphore, Stream } from "effect"
 import { AgentV2 } from "../../agent"
 import { Config } from "../../config"
 import { Database } from "../../database/database"
@@ -18,13 +18,15 @@ import { ModelV2 } from "../../model"
 import { ProviderV2 } from "../../provider"
 import { QuestionV2 } from "../../question"
 import { SystemContext } from "../../system-context/index"
-import { SystemContextRegistry } from "../../system-context/registry"
+import { SystemContextBuiltIns } from "../../system-context/builtins"
+import { InstructionContext } from "../../instruction-context"
 import { SkillGuidance } from "../../skill/guidance"
 import { ReferenceGuidance } from "../../reference/guidance"
 import { McpGuidance } from "../../mcp/guidance"
+import { SessionContextEntry } from "../context-entry"
 import { ToolRegistry } from "../../tool/registry"
 import { ToolOutputStore } from "../../tool-output-store"
-import { SessionContextEpoch } from "../context-epoch"
+import { SessionContextCheckpoint } from "../context-checkpoint"
 import { SessionCompaction } from "../compaction"
 import { SessionEvent } from "../event"
 import { SessionHistory } from "../history"
@@ -102,10 +104,12 @@ const layer = Layer.effect(
     const models = yield* SessionRunnerModel.Service
     const store = yield* SessionStore.Service
     const location = yield* Location.Service
-    const systemContext = yield* SystemContextRegistry.Service
+    const builtins = yield* SystemContextBuiltIns.Service
+    const instructions = yield* InstructionContext.Service
     const skillGuidance = yield* SkillGuidance.Service
     const referenceGuidance = yield* ReferenceGuidance.Service
     const mcpGuidance = yield* McpGuidance.Service
+    const contextEntries = yield* SessionContextEntry.Service
     const snapshots = yield* Snapshot.Service
     const db = (yield* Database.Service).db
     const compaction = yield* SessionCompaction.Service
@@ -169,10 +173,18 @@ const layer = Layer.effect(
     const continueAfterOverflowCompaction = (step: number) =>
       new TurnTransitionError({ _tag: "ContinueAfterOverflowCompaction", step })
 
-    const loadSystemContext = (agent: AgentV2.Selection) =>
-      Effect.all([systemContext.load(), skillGuidance.load(agent), referenceGuidance.load(), mcpGuidance.load(agent)], {
-        concurrency: "unbounded",
-      }).pipe(Effect.map(SystemContext.combine))
+    const loadSystemContext = (agent: AgentV2.Selection, sessionID: SessionSchema.ID) =>
+      Effect.all(
+        [
+          builtins.load(),
+          instructions.load(),
+          skillGuidance.load(agent),
+          referenceGuidance.load(),
+          mcpGuidance.load(agent),
+          contextEntries.load(sessionID),
+        ],
+        { concurrency: "unbounded" },
+      ).pipe(Effect.map(SystemContext.combine))
 
     const runTurnAttempt = Effect.fn("SessionRunner.runTurn")(function* (
       sessionID: SessionSchema.ID,
@@ -184,7 +196,14 @@ const layer = Layer.effect(
       if (session.location.directory !== location.directory || session.location.workspaceID !== location.workspaceID)
         return yield* Effect.interrupt
       const agent = yield* agents.select(session.agent)
-      const initialized = yield* SessionContextEpoch.initialize(db, loadSystemContext(agent), session.id)
+      // Establish what the model knows before admitting what the user said, so
+      // a blocked first turn leaves pending inputs untouched.
+      const checkpoint = yield* SessionContextCheckpoint.prepare(
+        db,
+        events,
+        loadSystemContext(agent, session.id),
+        session.id,
+      )
       const toolFibers = yield* FiberSet.make<void, ToolOutputStore.Error>()
       let needsContinuation = false
       let currentStep = step
@@ -198,10 +217,8 @@ const layer = Layer.effect(
         }
         if (promoted > 0) currentStep = 1
       }
-      const system =
-        initialized ?? (yield* SessionContextEpoch.prepare(db, events, loadSystemContext(agent), session.id))
       const model = yield* models.resolve(session)
-      const entries = yield* SessionHistory.entriesForRunner(db, session.id, system.baselineSeq)
+      const entries = yield* SessionHistory.entriesForRunner(db, session.id, checkpoint.baselineSeq)
       const context = entries.map((entry) => entry.message)
       const isLastStep = agent.info?.steps !== undefined && currentStep >= agent.info.steps
       const toolMaterialization = isLastStep
@@ -211,7 +228,10 @@ const layer = Layer.effect(
       const request = LLM.request({
         model,
         providerOptions: { openai: { promptCacheKey } },
-        system: [agent.info?.system ? agent.info.system : SessionRunnerSystemPrompt.provider(model), system.baseline]
+        system: [
+          agent.info?.system ? agent.info.system : SessionRunnerSystemPrompt.provider(model),
+          checkpoint.baseline,
+        ]
           .filter((part): part is string => part !== undefined && part.length > 0)
           .map(SystemPart.make),
         messages: [...toLLMMessages(context, model), ...(isLastStep ? [Message.assistant(MAX_STEPS_PROMPT)] : [])],
@@ -387,7 +407,7 @@ const layer = Layer.effect(
       )
     })
 
-    const run = Effect.fn("SessionRunner.run")(function* (input: {
+    const drain = Effect.fnUntraced(function* (input: {
       readonly sessionID: SessionSchema.ID
       readonly force: boolean
     }) {
@@ -418,6 +438,30 @@ const layer = Layer.effect(
       }
     })
 
+    const run = Effect.fn("SessionRunner.run")(
+      (input: { readonly sessionID: SessionSchema.ID; readonly force: boolean }) =>
+        drain(input).pipe(
+          Effect.onExit((exit) =>
+            Effect.gen(function* () {
+              const failure =
+                Exit.isFailure(exit) && !Cause.hasInterrupts(exit.cause) ? Cause.squash(exit.cause) : undefined
+              yield* events.publish(SessionEvent.ExecutionSettled, {
+                sessionID: input.sessionID,
+                timestamp: yield* DateTime.now,
+                outcome: Exit.isSuccess(exit) ? "success" : Cause.hasInterrupts(exit.cause) ? "interrupted" : "failure",
+                error:
+                  failure !== undefined
+                    ? { type: "unknown", message: failure instanceof Error ? failure.message : String(failure) }
+                    : undefined,
+              })
+            }).pipe(
+              Effect.catchCause(() => Effect.void),
+              Effect.asVoid,
+            ),
+          ),
+        ),
+    )
+
     return Service.of({
       run,
     })
@@ -435,10 +479,12 @@ export const node = makeLocationNode({
     SessionRunnerModel.node,
     SessionStore.node,
     Location.node,
-    SystemContextRegistry.node,
+    SystemContextBuiltIns.node,
+    InstructionContext.node,
     SkillGuidance.node,
     ReferenceGuidance.node,
     McpGuidance.node,
+    SessionContextEntry.node,
     SessionCompaction.node,
     SessionTitle.node,
     Config.node,

packages/core/src/session/runner/model.ts

@@ -12,6 +12,7 @@ import { Catalog } from "../../catalog"
 import { Credential } from "../../credential"
 import { Integration } from "../../integration"
 import { ModelV2 } from "../../model"
+import { OpenAICodex } from "../../plugin/provider/openai-codex"
 import { ProviderV2 } from "../../provider"
 import { SessionSchema } from "../schema"
 
@@ -96,11 +97,22 @@ const withDefaults = (model: ModelV2.Info, route: AnyRoute) => {
     provider: model.providerID,
     endpoint: model.api.url === undefined ? undefined : { baseURL: model.api.url },
     headers: model.request.headers,
+    providerOptions: providerOptions(model),
     http: { body: httpBody },
     limits: { context: model.limit.context, output: model.limit.output },
   })
 }
 
+const providerOptions = (
+  model: ModelV2.Info,
+): { readonly [key: string]: { readonly [key: string]: unknown } } | undefined => {
+  if (Object.keys(model.request.settings).length === 0) return undefined
+  if (model.api.type !== "aisdk") return undefined
+  if (model.api.package === "@ai-sdk/openai") return { openai: model.request.settings }
+  if (model.api.package === "@ai-sdk/anthropic") return { anthropic: model.request.settings }
+  if (model.api.package === "@ai-sdk/openai-compatible") return { openai: model.request.settings }
+}
+
 export const withVariant = (
   model: ModelV2.Info,
   variantID: ModelV2.VariantID | undefined,
@@ -118,6 +130,7 @@ export const withVariant = (
   return Effect.succeed(
     variant
       ? produce(model, (draft) => {
+          Object.assign(draft.request.settings, variant.settings)
           Object.assign(draft.request.headers, variant.headers)
           Object.assign(draft.request.body, variant.body)
         })
@@ -140,6 +153,21 @@ export const fromCatalogModel = (
         })
   const key = apiKey(resolved, credential)
   if (resolved.api.type === "aisdk" && resolved.api.package === "@ai-sdk/openai") {
+    // ChatGPT-plan OAuth tokens are not API-key credentials: the public API rejects
+    // them, so requests must target the codex backend with the account header.
+    if (OpenAICodex.isChatGPT(credential)) {
+      const account = OpenAICodex.accountID(credential)
+      return Effect.succeed(
+        withDefaults(resolved, OpenAIResponses.route)
+          .with({
+            endpoint: { baseURL: OpenAICodex.baseURL },
+            auth: (key === undefined ? Auth.none : Auth.bearer(key)).andThen(
+              account === undefined ? Auth.none : Auth.headers({ "chatgpt-account-id": account }),
+            ),
+          })
+          .model({ id: resolved.api.id }),
+      )
+    }
     return Effect.succeed(
       withDefaults(resolved, OpenAIResponses.route)
         .with({ auth: key === undefined ? Auth.none : Auth.bearer(key) })

packages/core/src/session/runner/to-llm-message.ts

@@ -130,7 +130,7 @@ function toLLMMessage(message: SessionMessage.Message, model: Model): Message[]
         }),
       ]
     case "synthetic":
-      return [Message.make({ id: message.id, role: "user", content: message.text, metadata: message.metadata })]
+      return [Message.make({ id: message.id, role: "user", content: message.text })]
     case "skill":
       return [Message.make({ id: message.id, role: "user", content: message.text, metadata: message.metadata })]
     case "system":

packages/core/src/session/sql.ts

@@ -14,6 +14,7 @@ import { Timestamps } from "../database/schema.sql"
 import type { SystemContext } from "../system-context/index"
 import { AgentV2 } from "../agent"
 import type { Revert } from "@opencode-ai/schema/revert"
+import type { Schema } from "effect"
 
 type SessionMessageData = Omit<(typeof SessionMessage.Message)["Encoded"], "type" | "id">
 type V1MessageData = Omit<SessionV1.Info, "id" | "sessionID">
@@ -165,12 +166,26 @@ export const SessionInputTable = sqliteTable(
   ],
 )
 
-export const SessionContextEpochTable = sqliteTable("session_context_epoch", {
+export const SessionContextEntryTable = sqliteTable(
+  "session_context_entry",
+  {
+    session_id: text()
+      .$type<SessionSchema.ID>()
+      .notNull()
+      .references(() => SessionTable.id, { onDelete: "cascade" }),
+    key: text().notNull(),
+    value: text({ mode: "json" }).notNull().$type<Schema.Json>(),
+    ...Timestamps,
+  },
+  (table) => [primaryKey({ columns: [table.session_id, table.key] })],
+)
+
+export const SessionContextCheckpointTable = sqliteTable("session_context_epoch", {
   session_id: text()
     .$type<SessionSchema.ID>()
     .primaryKey()
     .references(() => SessionTable.id, { onDelete: "cascade" }),
   baseline: text().notNull(),
-  snapshot: text({ mode: "json" }).notNull().$type<SystemContext.Snapshot>(),
+  snapshot: text({ mode: "json" }).notNull().$type<SystemContext.Applied>(),
   baseline_seq: integer().notNull(),
 })

packages/core/src/session/store.ts

@@ -14,10 +14,6 @@ import { fromRow } from "./info"
 export interface Interface {
   readonly get: (sessionID: SessionSchema.ID) => Effect.Effect<SessionSchema.Info | undefined>
   readonly context: (sessionID: SessionSchema.ID) => Effect.Effect<SessionMessage.Message[], MessageDecodeError>
-  readonly runnerContext: (
-    sessionID: SessionSchema.ID,
-    baselineSeq: number,
-  ) => Effect.Effect<SessionMessage.Message[], MessageDecodeError>
   readonly message: (
     messageID: SessionMessage.ID,
   ) => Effect.Effect<{ readonly sessionID: SessionSchema.ID; readonly message: SessionMessage.Message } | undefined>
@@ -39,9 +35,6 @@ const layer = Layer.effect(
       context: Effect.fn("SessionStore.context")(function* (sessionID) {
         return yield* SessionHistory.load(db, sessionID)
       }),
-      runnerContext: Effect.fn("SessionStore.runnerContext")(function* (sessionID, baselineSeq) {
-        return yield* SessionHistory.loadForRunner(db, sessionID, baselineSeq)
-      }),
       message: Effect.fn("SessionStore.message")(function* (messageID) {
         const row = yield* db
           .select()

packages/core/src/skill/guidance.ts

@@ -13,23 +13,47 @@ const Summary = Schema.Struct({
 })
 type Summary = typeof Summary.Type
 
+const entries = (skills: ReadonlyArray<Summary>) =>
+  skills.flatMap((skill) => [
+    "  <skill>",
+    `    <name>${skill.name}</name>`,
+    `    <description>${skill.description}</description>`,
+    "  </skill>",
+  ])
+
 const render = (skills: ReadonlyArray<Summary>) =>
   [
     "Skills provide specialized instructions and workflows for specific tasks.",
     "Use the skill tool to load a skill when a task matches its description.",
     ...(skills.length === 0
       ? ["No skills are currently available."]
+      : ["<available_skills>", ...entries(skills), "</available_skills>"]),
+  ].join("\n")
+
+const update = (previous: ReadonlyArray<Summary>, current: ReadonlyArray<Summary>) => {
+  const diff = SystemContext.diffByKey(
+    previous,
+    current,
+    (skill) => skill.name,
+    (before, after) => before.description !== after.description,
+  )
+  // Additions and removals render as small deltas; anything else restates the full list.
+  if (diff.changed.length > 0 || (diff.added.length === 0 && diff.removed.length === 0))
+    return [
+      "The available skills have changed. This list supersedes the previous available skills list.",
+      render(current),
+    ].join("\n")
+  return [
+    ...(diff.added.length === 0
+      ? []
+      : ["New skills are available in addition to those previously listed:", ...entries(diff.added)]),
+    ...(diff.removed.length === 0
+      ? []
       : [
-          "<available_skills>",
-          ...skills.flatMap((skill) => [
-            "  <skill>",
-            `    <name>${skill.name}</name>`,
-            `    <description>${skill.description}</description>`,
-            "  </skill>",
-          ]),
-          "</available_skills>",
+          `The following skills are no longer available and must not be used: ${diff.removed.map((skill) => skill.name).join(", ")}.`,
         ]),
   ].join("\n")
+}
 
 export interface Interface {
   readonly load: (agent: AgentV2.Selection) => Effect.Effect<SystemContext.SystemContext>
@@ -61,11 +85,7 @@ const layer = Layer.effect(
           codec: Schema.toCodecJson(Schema.Array(Summary)),
           load: Effect.succeed(available),
           baseline: render,
-          update: (_previous, current) =>
-            [
-              "The available skills have changed. This list supersedes the previous available skills list.",
-              render(current),
-            ].join("\n"),
+          update,
           removed: () => "Skill guidance is no longer available. Do not use any previously listed skill.",
         })
       }),

packages/core/src/system-context/builtins.ts

@@ -1,18 +1,20 @@
 export * as SystemContextBuiltIns from "./builtins"
 
 import { makeLocationNode } from "../effect/app-node"
-import { DateTime, Effect, Layer, Schema } from "effect"
+import { Context, DateTime, Effect, Layer, Schema } from "effect"
 import { Location } from "../location"
 import { SystemContext } from "./index"
-import { InstructionContext } from "../instruction-context"
-import { SystemContextRegistry } from "./registry"
-import { FSUtil } from "../fs-util"
-import { Global } from "../global"
 
-const builtIns = Layer.effectDiscard(
+export interface Interface {
+  readonly load: () => Effect.Effect<SystemContext.SystemContext>
+}
+
+export class Service extends Context.Service<Service, Interface>()("@opencode/v2/SystemContextBuiltIns") {}
+
+const layer = Layer.effect(
+  Service,
   Effect.gen(function* () {
     const location = yield* Location.Service
-    const registry = yield* SystemContextRegistry.Service
     const environment = [
       "<env>",
       `  Working directory: ${location.directory}`,
@@ -39,12 +41,8 @@ const builtIns = Layer.effectDiscard(
       }),
     ])
 
-    yield* registry.register({ key: SystemContext.Key.make("core/builtins"), load: Effect.succeed(context) })
+    return Service.of({ load: () => Effect.succeed(context) })
   }),
 )
 
-export const node = makeLocationNode({
-  name: "system-context-builtins",
-  layer: builtIns,
-  deps: [Location.node, SystemContextRegistry.node, InstructionContext.node, FSUtil.node, Global.node],
-})
+export const node = makeLocationNode({ service: Service, layer, deps: [Location.node] })

packages/core/src/system-context/index.ts

@@ -7,13 +7,18 @@ import { Effect, Option, Schema } from "effect"
  *
  * `Source<A>` describes how to observe, compare, and render one value. `make`
  * closes over `A`, producing an opaque `SystemContext` that composes uniformly
- * with contexts built from other value types. Interpreters observe the composed
- * context once, then produce a durable structured
- * `Snapshot` alongside the exact model-visible baseline or update text.
+ * with contexts built from other value types.
+ *
+ * The durable `Applied` record tracks what the model was last told, per source:
+ * it is the model's current belief. Interpreters uphold one invariant —
+ * `reconcile` never rewrites the baseline; it only narrates drift as update
+ * text. Only `rebaseline` (compaction) and `initialize` (first turn) produce
+ * baseline text.
  *
  * Returning `unavailable` means observation failed temporarily. It differs from
- * removing a source from the context: refresh preserves the admitted snapshot,
- * and replacement waits rather than silently constructing an incomplete baseline.
+ * removing a source from the context: the model's prior belief stands.
+ * `reconcile` retains the applied value silently, and `rebaseline` restates the
+ * belief by rendering the last-applied value instead of a live observation.
  *
  * @module
  */
@@ -45,39 +50,30 @@ export interface SystemContext {
   readonly [ContextTypeId]: ReadonlyArray<PackedSource>
 }
 
-/** Durable comparison state for one admitted source. */
-export const SourceSnapshot = Schema.Struct({
+/** The value last applied to the model for one admitted source. */
+export const AppliedSource = Schema.Struct({
   value: Schema.Json,
   removed: Schema.optional(Schema.NonEmptyString),
 })
-export type SourceSnapshot = typeof SourceSnapshot.Type
+export type AppliedSource = typeof AppliedSource.Type
 
-/** Durable structured comparison state for one active context generation. */
-export const Snapshot = Schema.Record(Key, SourceSnapshot)
-export type Snapshot = Readonly<Record<string, SourceSnapshot>>
+/** Durable record of what the model currently believes, per source. */
+export const Applied = Schema.Record(Key, AppliedSource)
+export type Applied = Readonly<Record<string, AppliedSource>>
 
-export interface Generation {
-  readonly baseline: string
-  readonly snapshot: Snapshot
+/** A rendered baseline together with the applied values it was rendered from. */
+export interface Baseline {
+  readonly text: string
+  readonly applied: Applied
 }
 
 export interface Updated {
   readonly _tag: "Updated"
   readonly text: string
-  readonly snapshot: Snapshot
+  readonly applied: Applied
 }
 
-export interface ReplacementReady {
-  readonly _tag: "ReplacementReady"
-  readonly generation: Generation
-}
-
-export interface ReplacementBlocked {
-  readonly _tag: "ReplacementBlocked"
-}
-
-export type ReplacementResult = ReplacementReady | ReplacementBlocked
-export type ReconcileResult = { readonly _tag: "Unchanged" } | Updated | ReplacementResult
+export type ReconcileResult = { readonly _tag: "Unchanged" } | Updated
 
 export class InitializationBlocked extends Schema.TaggedErrorClass<InitializationBlocked>()(
   "SystemContext.InitializationBlocked",
@@ -98,36 +94,24 @@ export class DuplicateKeyError extends Schema.TaggedErrorClass<DuplicateKeyError
 
 interface PackedSource {
   readonly key: Key
-  readonly load: Effect.Effect<Loaded | Unavailable>
+  readonly load: Effect.Effect<Observed | Unavailable>
+  /** Restates the model's belief from a last-applied value when the source cannot be observed. */
+  readonly recall: (stored: AppliedSource) => string | undefined
 }
 
-interface Loaded {
-  readonly baseline: () => Rendered
-  readonly compare: (previous: Schema.Json) => Compared
+interface Observed {
+  readonly applied: AppliedSource
+  readonly baseline: () => string
+  /** `undefined` means unchanged. An undecodable previous value re-renders the baseline (treat-as-new). */
+  readonly update: (previous: AppliedSource) => string | undefined
 }
 
-interface Rendered {
-  readonly text: string
-  readonly snapshot: SourceSnapshot
-}
-
-type Compared =
-  | { readonly _tag: "Incompatible" }
-  | { readonly _tag: "Unchanged" }
-  | { readonly _tag: "Updated"; readonly render: () => Rendered }
-
-interface AvailableEntry extends Loaded {
-  readonly _tag: "Available"
+interface Entry {
   readonly key: Key
+  readonly recall: PackedSource["recall"]
+  readonly observed: Observed | Unavailable
 }
 
-interface UnavailableEntry {
-  readonly _tag: "Unavailable"
-  readonly key: Key
-}
-
-type Entry = AvailableEntry | UnavailableEntry
-
 /** The identity context. */
 export const empty = context([])
 
@@ -136,42 +120,65 @@ export function make<A>(source: Source<A>): SystemContext {
   const decode = Schema.decodeUnknownOption(source.codec)
   const encode = Schema.encodeSync(source.codec)
   const equivalent = Schema.toEquivalence(source.codec)
+  const baseline = (value: A) => requireText(source.key, "baseline", source.baseline(value))
   return context([
     {
       key: source.key,
+      recall: (stored) =>
+        Option.match(decode(stored.value), {
+          onNone: () => undefined,
+          onSome: baseline,
+        }),
       load: source.load.pipe(
         Effect.map((value) => {
           if (isUnavailable(value)) return value
-          const snapshot = (): SourceSnapshot => ({
-            value: encode(value),
-            ...(source.removed ? { removed: requireText(source.key, "removal", source.removed(value)) } : {}),
-          })
           return {
-            baseline: (): Rendered => ({
-              text: requireText(source.key, "baseline", source.baseline(value)),
-              snapshot: snapshot(),
-            }),
-            compare: (previous): Compared =>
-              Option.match(decode(previous), {
-                onNone: (): Compared => ({ _tag: "Incompatible" }),
-                onSome: (decoded): Compared =>
+            applied: {
+              value: encode(value),
+              ...(source.removed ? { removed: requireText(source.key, "removal", source.removed(value)) } : {}),
+            },
+            baseline: () => baseline(value),
+            update: (previous) =>
+              Option.match(decode(previous.value), {
+                onNone: () => baseline(value),
+                onSome: (decoded) =>
                   equivalent(decoded, value)
-                    ? { _tag: "Unchanged" }
-                    : {
-                        _tag: "Updated",
-                        render: () => ({
-                          text: requireText(source.key, "update", source.update(decoded, value)),
-                          snapshot: snapshot(),
-                        }),
-                      },
+                    ? undefined
+                    : requireText(source.key, "update", source.update(decoded, value)),
               }),
-          }
+          } satisfies Observed
         }),
       ),
     },
   ])
 }
 
+/**
+ * Keyed three-way diff for list-shaped sources rendering delta updates.
+ * `changed` compares two values sharing a key; entries equal under it are dropped.
+ */
+export function diffByKey<A>(
+  previous: ReadonlyArray<A>,
+  current: ReadonlyArray<A>,
+  key: (value: A) => string,
+  changed: (previous: A, current: A) => boolean,
+): {
+  readonly added: ReadonlyArray<A>
+  readonly removed: ReadonlyArray<A>
+  readonly changed: ReadonlyArray<{ readonly previous: A; readonly current: A }>
+} {
+  const currentKeys = new Set(current.map(key))
+  const previousByKey = new Map(previous.map((value) => [key(value), value] as const))
+  return {
+    added: current.filter((value) => !previousByKey.has(key(value))),
+    removed: previous.filter((value) => !currentKeys.has(key(value))),
+    changed: current.flatMap((value) => {
+      const before = previousByKey.get(key(value))
+      return before === undefined || !changed(before, value) ? [] : [{ previous: before, current: value }]
+    }),
+  }
+}
+
 /** Combines contexts in order and rejects duplicate source keys immediately. */
 export function combine(values: ReadonlyArray<SystemContext>): SystemContext {
   const sources = values.flatMap((value) => value[ContextTypeId])
@@ -183,111 +190,91 @@ const observe = (value: SystemContext) =>
   Effect.forEach(
     value[ContextTypeId],
     (source) =>
-      source.load.pipe(
-        Effect.map(
-          (result): Entry =>
-            result === unavailable
-              ? { _tag: "Unavailable", key: source.key }
-              : { _tag: "Available", key: source.key, ...result },
-        ),
-      ),
+      source.load.pipe(Effect.map((observed): Entry => ({ key: source.key, recall: source.recall, observed }))),
     { concurrency: "unbounded" },
   )
 
-/** Creates the immutable baseline and durable snapshot for a new generation. */
-export function initialize(value: SystemContext): Effect.Effect<Generation, InitializationBlocked> {
+/** Creates the first baseline. Blocks rather than admit a baseline missing an unobservable source. */
+export function initialize(value: SystemContext): Effect.Effect<Baseline, InitializationBlocked> {
   return observe(value).pipe(
     Effect.flatMap((entries) => {
-      const unavailable = entries.flatMap((entry) => (entry._tag === "Unavailable" ? [entry.key] : []))
-      if (unavailable.length > 0) return new InitializationBlocked({ keys: unavailable })
-      return Effect.succeed(initializeObservation(entries))
+      const blocked = entries.flatMap((entry) => (entry.observed === unavailable ? [entry.key] : []))
+      if (blocked.length > 0) return new InitializationBlocked({ keys: blocked })
+      const parts: string[] = []
+      const applied: Record<string, AppliedSource> = {}
+      for (const entry of entries) {
+        if (entry.observed === unavailable) continue
+        parts.push(entry.observed.baseline())
+        applied[entry.key] = entry.observed.applied
+      }
+      return Effect.succeed({ text: render(parts), applied })
     }),
   )
 }
 
-function initializeObservation(entries: ReadonlyArray<Entry>): Generation {
-  const available = entries.filter((entry): entry is AvailableEntry => entry._tag === "Available")
-  const rendered = available.map((entry) => [entry.key, entry.baseline()] as const)
-  return {
-    baseline: render(rendered.map(([, result]) => result.text)),
-    snapshot: Object.fromEntries(rendered.map(([key, result]) => [key, result.snapshot])),
-  }
-}
-
-/** Reconciles current source values with one active generation. */
-export function reconcile(value: SystemContext, previous: Snapshot): Effect.Effect<ReconcileResult> {
+/** Narrates drift between current source values and the model's beliefs. Never rewrites the baseline. */
+export function reconcile(value: SystemContext, previous: Applied): Effect.Effect<ReconcileResult> {
   return observe(value).pipe(
     Effect.map((entries): ReconcileResult => {
-      const result = reconcileObservation(entries, previous)
-      if (result._tag === "Unchanged" || result._tag === "Updated") return result
-      return replaceObservation(entries, previous)
+      const updates: string[] = []
+      const applied: Record<string, AppliedSource> = {}
+      for (const entry of entries) {
+        const stored = get(previous, entry.key)
+        if (entry.observed === unavailable) {
+          // The prior belief stands while the source cannot be observed.
+          if (stored) applied[entry.key] = stored
+          continue
+        }
+        if (!stored) {
+          updates.push(entry.observed.baseline())
+          applied[entry.key] = entry.observed.applied
+          continue
+        }
+        const text = entry.observed.update(stored)
+        if (text === undefined) {
+          applied[entry.key] = stored
+          continue
+        }
+        updates.push(text)
+        applied[entry.key] = entry.observed.applied
+      }
+      const keys = new Set<string>(entries.map((entry) => entry.key))
+      for (const key of Object.keys(previous).sort()) {
+        if (keys.has(key)) continue
+        const removed = previous[key].removed
+        // An unannounced removal retains the belief; it clears at the next rebaseline.
+        if (removed === undefined) applied[key] = previous[key]
+        else updates.push(removed)
+      }
+      if (updates.length === 0) return { _tag: "Unchanged" }
+      return { _tag: "Updated", text: render(updates), applied }
     }),
   )
 }
 
-function reconcileObservation(
-  entries: ReadonlyArray<Entry>,
-  previous: Snapshot,
-): { readonly _tag: "Unchanged" } | Updated | { readonly _tag: "Replace" } {
-  const keys = new Set(entries.map((entry) => entry.key))
-  const comparisons = new Map<Key, Compared>()
-  for (const entry of entries) {
-    if (entry._tag === "Unavailable") continue
-    const stored = getSnapshot(previous, entry.key)
-    if (!stored) continue
-    const compared = entry.compare(stored.value)
-    if (compared._tag === "Incompatible") return { _tag: "Replace" }
-    comparisons.set(entry.key, compared)
-  }
-  for (const key of Object.keys(previous).sort()) {
-    if (keys.has(Key.make(key))) continue
-    if (previous[key].removed === undefined) return { _tag: "Replace" }
-  }
-
-  const snapshot: Record<string, SourceSnapshot> = {}
-  const updates: string[] = []
-  for (const entry of entries) {
-    const stored = getSnapshot(previous, entry.key)
-    if (entry._tag === "Unavailable") {
-      if (stored) snapshot[entry.key] = stored
-      continue
-    }
-    if (!stored) {
-      const rendered = entry.baseline()
-      updates.push(rendered.text)
-      snapshot[entry.key] = rendered.snapshot
-      continue
-    }
-    const compared = comparisons.get(entry.key)
-    if (!compared || compared._tag === "Incompatible")
-      throw new Error(`Missing comparison for system context source ${entry.key}`)
-    if (compared._tag === "Unchanged") {
-      snapshot[entry.key] = stored
-      continue
-    }
-    const rendered = compared.render()
-    updates.push(rendered.text)
-    snapshot[entry.key] = rendered.snapshot
-  }
-  for (const key of Object.keys(previous).sort()) {
-    if (keys.has(Key.make(key))) continue
-    const removed = previous[key].removed
-    if (removed === undefined) throw new Error(`Missing removal rendering for system context source ${key}`)
-    updates.push(removed)
-  }
-  if (updates.length === 0) return { _tag: "Unchanged" }
-  return { _tag: "Updated", text: render(updates), snapshot }
-}
-
-/** Creates a complete replacement generation or blocks while admitted context is unavailable. */
-export function replace(value: SystemContext, previous: Snapshot): Effect.Effect<ReplacementResult> {
-  return observe(value).pipe(Effect.map((entries) => replaceObservation(entries, previous)))
-}
-
-function replaceObservation(entries: ReadonlyArray<Entry>, previous: Snapshot): ReplacementResult {
-  if (entries.some((entry) => entry._tag === "Unavailable" && getSnapshot(previous, entry.key) !== undefined))
-    return { _tag: "ReplacementBlocked" }
-  return { _tag: "ReplacementReady", generation: initializeObservation(entries) }
+/** Rebuilds the baseline, restating unobservable sources from the model's last-applied beliefs. */
+export function rebaseline(value: SystemContext, previous: Applied): Effect.Effect<Baseline> {
+  return observe(value).pipe(
+    Effect.map((entries): Baseline => {
+      const parts: string[] = []
+      const applied: Record<string, AppliedSource> = {}
+      for (const entry of entries) {
+        if (entry.observed !== unavailable) {
+          parts.push(entry.observed.baseline())
+          applied[entry.key] = entry.observed.applied
+          continue
+        }
+        const stored = get(previous, entry.key)
+        if (!stored) continue
+        const text = entry.recall(stored)
+        // An undecodable belief cannot be restated; the source re-announces when observable again.
+        if (text === undefined) continue
+        parts.push(text)
+        applied[entry.key] = stored
+      }
+      return { text: render(parts), applied }
+    }),
+  )
 }
 
 function context(sources: ReadonlyArray<PackedSource>): SystemContext {
@@ -298,8 +285,8 @@ function render(parts: ReadonlyArray<string>) {
   return parts.join("\n\n")
 }
 
-function getSnapshot(snapshot: Snapshot, key: Key) {
-  return Object.hasOwn(snapshot, key) ? snapshot[key] : undefined
+function get(applied: Applied, key: Key) {
+  return Object.hasOwn(applied, key) ? applied[key] : undefined
 }
 
 function isUnavailable(value: unknown): value is Unavailable {

packages/core/src/system-context/registry.ts

@@ -1,49 +0,0 @@
-export * as SystemContextRegistry from "./registry"
-
-import { Context, Effect, Layer, Ref, Scope } from "effect"
-import { SystemContext } from "./index"
-import { makeLocationNode } from "../effect/app-node"
-
-export interface Entry {
-  readonly key: SystemContext.Key
-  readonly load: Effect.Effect<SystemContext.SystemContext>
-}
-
-export interface Interface {
-  readonly register: (entry: Entry) => Effect.Effect<void, never, Scope.Scope>
-  readonly load: () => Effect.Effect<SystemContext.SystemContext>
-}
-
-export class Service extends Context.Service<Service, Interface>()("@opencode/v2/SystemContextRegistry") {}
-
-const layer = Layer.effect(
-  Service,
-  Effect.gen(function* () {
-    const entries = yield* Ref.make<ReadonlyArray<Entry>>([])
-
-    return Service.of({
-      register: Effect.fn("SystemContextRegistry.register")(function* (entry) {
-        yield* Effect.acquireRelease(
-          Ref.modify(entries, (current) => {
-            if (current.some((item) => item.key === entry.key)) return [false, current]
-            return [true, [...current, entry]]
-          }).pipe(
-            Effect.flatMap((added) =>
-              added ? Effect.void : Effect.die(`Duplicate system context entry key: ${entry.key}`),
-            ),
-            Effect.as(entry),
-          ),
-          (entry) => Ref.update(entries, (current) => current.filter((item) => item !== entry)),
-        )
-      }),
-      load: Effect.fn("SystemContextRegistry.load")(function* () {
-        const current = (yield* Ref.get(entries)).toSorted((a, b) => (a.key < b.key ? -1 : a.key > b.key ? 1 : 0))
-        return SystemContext.combine(
-          yield* Effect.forEach(current, (entry) => entry.load, { concurrency: "unbounded" }),
-        )
-      }),
-    })
-  }),
-)
-
-export const node = makeLocationNode({ service: Service, layer, deps: [] })

packages/core/src/tool/builtins.ts

@@ -4,7 +4,6 @@ import { makeLocationNode } from "../effect/app-node"
 import { Context, Layer } from "effect"
 import { ApplyPatchTool } from "./apply-patch"
 import { EditTool } from "./edit"
-import { GlobTool } from "./glob"
 import { GrepTool } from "./grep"
 import { QuestionTool } from "./question"
 import { ReadTool } from "./read"
@@ -38,7 +37,6 @@ export const node = makeLocationNode({
   deps: [
     ApplyPatchTool.node,
     EditTool.node,
-    GlobTool.node,
     GrepTool.node,
     QuestionTool.node,
     ReadTool.node,

packages/core/src/tool/glob.ts

@@ -1,17 +1,15 @@
 export * as GlobTool from "./glob"
 
 import { ToolFailure } from "@opencode-ai/llm"
-import { Effect, Layer, Schema } from "effect"
+import type { PluginContext } from "@opencode-ai/plugin/v2/effect"
+import { Effect, Schema } from "effect"
 import path from "path"
-import { makeLocationNode } from "../effect/app-node"
 import { FileSystem } from "../filesystem"
 import { Location } from "../location"
 import { Ripgrep } from "../ripgrep"
 import { RelativePath } from "../schema"
 import { PermissionV2 } from "../permission"
-import { ToolRegistry } from "./registry"
 import { Tool } from "./tool"
-import { Tools } from "./tools"
 
 export const name = "glob"
 
@@ -35,14 +33,14 @@ export const toModelOutput = (output: ModelOutput) => {
 }
 
 /** Glob leaf that defaults its filesystem root to the active Location. */
-const layer = Layer.effectDiscard(
-  Effect.gen(function* () {
-    const tools = yield* Tools.Service
+export const Plugin = {
+  id: "core-glob-tool",
+  effect: Effect.fn("GlobTool.Plugin")(function* (ctx: PluginContext) {
     const ripgrep = yield* Ripgrep.Service
     const location = yield* Location.Service
     const permission = yield* PermissionV2.Service
 
-    yield* tools
+    yield* ctx.tool
       .register({
         [name]: Tool.make({
           description:
@@ -96,10 +94,4 @@ const layer = Layer.effectDiscard(
       })
       .pipe(Effect.orDie)
   }),
-)
-
-export const node = makeLocationNode({
-  name: "tool/glob",
-  layer,
-  deps: [ToolRegistry.node, Ripgrep.node, Location.node, PermissionV2.node],
-})
+}

packages/core/src/tool/hooks.ts

@@ -0,0 +1,92 @@
+export * as ToolHooks from "./hooks"
+
+import { makeLocationNode } from "../effect/app-node"
+import { AgentV2 } from "../agent"
+import { SessionMessage } from "../session/message"
+import { SessionSchema } from "../session/schema"
+import { State } from "../state"
+import { Context, Effect, Layer, Scope } from "effect"
+import type { ToolOutput, ToolResultValue } from "@opencode-ai/llm"
+
+export interface BeforeEvent {
+  readonly tool: string
+  readonly sessionID: SessionSchema.ID
+  readonly agent: AgentV2.ID
+  readonly assistantMessageID: SessionMessage.ID
+  readonly toolCallID: string
+  input: unknown
+}
+
+export interface AfterEvent {
+  readonly tool: string
+  readonly sessionID: SessionSchema.ID
+  readonly agent: AgentV2.ID
+  readonly assistantMessageID: SessionMessage.ID
+  readonly toolCallID: string
+  readonly input: unknown
+  result: ToolResultValue
+  output?: ToolOutput
+  outputPaths?: ReadonlyArray<string>
+}
+
+export interface Interface {
+  readonly hook: {
+    readonly before: (
+      callback: (event: BeforeEvent) => Effect.Effect<void> | void,
+    ) => Effect.Effect<State.Registration, never, Scope.Scope>
+    readonly after: (
+      callback: (event: AfterEvent) => Effect.Effect<void> | void,
+    ) => Effect.Effect<State.Registration, never, Scope.Scope>
+  }
+  readonly runBefore: (event: BeforeEvent) => Effect.Effect<BeforeEvent>
+  readonly runAfter: (event: AfterEvent) => Effect.Effect<AfterEvent>
+}
+
+export class Service extends Context.Service<Service, Interface>()("@opencode/v2/ToolHooks") {}
+
+const layer = Layer.effect(
+  Service,
+  Effect.gen(function* () {
+    let beforeHooks: ((event: BeforeEvent) => Effect.Effect<void> | void)[] = []
+    let afterHooks: ((event: AfterEvent) => Effect.Effect<void> | void)[] = []
+
+    const register = <Event>(
+      hooks: () => ((event: Event) => Effect.Effect<void> | void)[],
+      update: (hooks: ((event: Event) => Effect.Effect<void> | void)[]) => void,
+    ) =>
+      Effect.fn("ToolHooks.hook")(function* (callback: (event: Event) => Effect.Effect<void> | void) {
+        const scope = yield* Scope.Scope
+        let active = true
+        update([...hooks(), callback])
+        const dispose = Effect.sync(() => {
+          if (!active) return
+          active = false
+          update(hooks().filter((item) => item !== callback))
+        })
+        yield* Scope.addFinalizer(scope, dispose)
+        return { dispose }
+      })
+
+    const run = Effect.fnUntraced(function* <Event>(
+      hooks: readonly ((event: Event) => Effect.Effect<void> | void)[],
+      event: Event,
+    ) {
+      for (const hook of hooks) {
+        const result = hook(event)
+        if (Effect.isEffect(result)) yield* result
+      }
+      return event
+    })
+
+    return Service.of({
+      hook: {
+        before: register(() => beforeHooks, (next) => (beforeHooks = next)),
+        after: register(() => afterHooks, (next) => (afterHooks = next)),
+      },
+      runBefore: (event) => run(beforeHooks, event),
+      runAfter: (event) => run(afterHooks, event),
+    })
+  }),
+)
+
+export const node = makeLocationNode({ service: Service, layer, deps: [] })

packages/core/src/tool/read.ts

@@ -1,12 +1,16 @@
 export * as ReadTool from "./read"
 
+import { dirname } from "path"
 import { ToolFailure } from "@opencode-ai/llm"
 import { Effect, Layer, Schema } from "effect"
 import { makeLocationNode } from "../effect/app-node"
 import { FileSystem } from "../filesystem"
+import { FSUtil } from "../fs-util"
 import { Image } from "../image"
+import { Location } from "../location"
 import { LocationMutation } from "../location-mutation"
 import { PermissionV2 } from "../permission"
+import { SessionInstructions } from "../session/instructions"
 import { AbsolutePath } from "../schema"
 import { ReadToolFileSystem } from "./read-filesystem"
 import { ToolRegistry } from "./registry"
@@ -14,6 +18,7 @@ import { Tool } from "./tool"
 import { Tools } from "./tools"
 
 export const name = "read"
+const FILENAME = "AGENTS.md"
 const SUPPORTED_IMAGE_MIMES = new Set(["image/jpeg", "image/png", "image/gif", "image/webp"])
 const LocationInput = Schema.Struct({
   path: Schema.String,
@@ -34,6 +39,9 @@ const layer = Layer.effectDiscard(
     const mutation = yield* LocationMutation.Service
     const image = yield* Image.Service
     const permission = yield* PermissionV2.Service
+    const sessionInstructions = yield* SessionInstructions.Service
+    const fs = yield* FSUtil.Service
+    const location = yield* Location.Service
 
     yield* tools
       .register({
@@ -77,12 +85,33 @@ const layer = Layer.effectDiscard(
                 agent: context.agent,
                 source,
               })
-              if (type === "directory")
-                return yield* reader.list(absolute, { offset: input.offset, limit: input.limit })
-              const content = yield* reader.read(absolute, resource, {
-                offset: input.offset,
-                limit: input.limit,
-              })
+              const content =
+                type === "directory"
+                  ? yield* reader.list(absolute, { offset: input.offset, limit: input.limit })
+                  : yield* reader.read(absolute, resource, {
+                      offset: input.offset,
+                      limit: input.limit,
+                    })
+              // After a successful read, discover nearby AGENTS.md walking up to the Location
+              // root exclusive and inject them as durable synthetic instructions. For a
+              // directory listing the walk starts at the directory itself (so its own AGENTS.md
+              // is discovered); for a file it starts at the file's dirname. External reads are
+              // skipped, and discovery failures never fail the read.
+              yield* Effect.gen(function* () {
+                if (target.externalDirectory !== undefined) return
+                const resolved = FSUtil.resolve(target.canonical)
+                const root = FSUtil.resolve(location.directory)
+                // up() searches its stop directory, so the Location-root AGENTS.md (already
+                // supplied by the core/instructions baseline) is dropped by the dirname filter.
+                const discovered = yield* fs.up({
+                  targets: [FILENAME],
+                  start: type === "directory" ? resolved : dirname(resolved),
+                  stop: root,
+                })
+                const candidates = discovered.map(FSUtil.resolve).filter((file) => dirname(file) !== root)
+                if (candidates.length === 0) return
+                yield* sessionInstructions.load({ sessionID: context.sessionID, paths: candidates })
+              }).pipe(Effect.catch(() => Effect.void), Effect.catchDefect(() => Effect.void))
               if ("encoding" in content && content.encoding === "base64" && SUPPORTED_IMAGE_MIMES.has(content.mime)) {
                 return yield* image
                   .normalize(resource, { ...content, encoding: "base64" })
@@ -113,5 +142,14 @@ const layer = Layer.effectDiscard(
 export const node = makeLocationNode({
   name: "tool/read",
   layer,
-  deps: [ToolRegistry.node, ReadToolFileSystem.node, LocationMutation.node, Image.node, PermissionV2.node],
+  deps: [
+    ToolRegistry.node,
+    ReadToolFileSystem.node,
+    LocationMutation.node,
+    Image.node,
+    PermissionV2.node,
+    SessionInstructions.node,
+    FSUtil.node,
+    Location.node,
+  ],
 })

packages/core/src/tool/registry.ts

@@ -10,6 +10,7 @@ import { ToolOutputStore } from "../tool-output-store"
 import { Wildcard } from "../util/wildcard"
 import { definition, permission, registrationEntries, settle, type AnyTool, type RegistrationError } from "./tool"
 import { Tools } from "./tools"
+import { ToolHooks } from "./hooks"
 import { makeLocationNode } from "../effect/app-node"
 
 export type ExecuteInput = {
@@ -47,6 +48,7 @@ const registryLayer = Layer.effect(
   Service,
   Effect.gen(function* () {
     const resources = yield* ToolOutputStore.Service
+    const toolHooks = yield* ToolHooks.Service
     type Registration = { readonly identity: object; readonly tool: AnyTool }
     const local = new Map<string, Array<{ readonly token: object; readonly registration: Registration }>>()
 
@@ -61,7 +63,17 @@ const registryLayer = Layer.effect(
         }
       if (advertised && registration.identity !== advertised)
         return { result: { type: "error" as const, value: `Stale tool call: ${input.call.name}` } }
-      const pending = yield* settle(registration.tool, input.call, {
+      // Hooks fire only for hosted/local tools; provider-executed calls never reach settleWith.
+      const beforeEvent: ToolHooks.BeforeEvent = {
+        tool: input.call.name,
+        sessionID: input.sessionID,
+        agent: input.agent,
+        assistantMessageID: input.assistantMessageID,
+        toolCallID: input.call.id,
+        input: input.call.input,
+      }
+      yield* toolHooks.runBefore(beforeEvent)
+      const pending = yield* settle(registration.tool, { ...input.call, input: beforeEvent.input }, {
         sessionID: input.sessionID,
         agent: input.agent,
         assistantMessageID: input.assistantMessageID,
@@ -72,15 +84,38 @@ const registryLayer = Layer.effect(
           Effect.succeed({ result: { type: "error" as const, value: failure.message } }),
         ),
       )
-      if ("result" in pending) return pending
-      const output = pending.output
-      const bounded = yield* resources.bound({ sessionID: input.sessionID, toolCallID: input.call.id, output })
-      const result = ToolOutput.toResultValue(bounded.output)
-      if (result.type === "error")
-        return bounded.outputPaths.length > 0 ? { result, outputPaths: bounded.outputPaths } : { result }
-      return bounded.outputPaths.length > 0
-        ? { result, output: bounded.output, outputPaths: bounded.outputPaths }
-        : { result, output: bounded.output }
+      let settlement: Settlement
+      if ("result" in pending) {
+        settlement = pending
+      } else {
+        const bounded = yield* resources.bound({ sessionID: input.sessionID, toolCallID: input.call.id, output: pending.output })
+        const result = ToolOutput.toResultValue(bounded.output)
+        settlement =
+          result.type === "error"
+            ? bounded.outputPaths.length > 0
+              ? { result, outputPaths: bounded.outputPaths }
+              : { result }
+            : bounded.outputPaths.length > 0
+              ? { result, output: bounded.output, outputPaths: bounded.outputPaths }
+              : { result, output: bounded.output }
+      }
+      const afterEvent: ToolHooks.AfterEvent = {
+        tool: input.call.name,
+        sessionID: input.sessionID,
+        agent: input.agent,
+        assistantMessageID: input.assistantMessageID,
+        toolCallID: input.call.id,
+        input: beforeEvent.input,
+        result: settlement.result,
+        output: settlement.output,
+        outputPaths: settlement.outputPaths,
+      }
+      yield* toolHooks.runAfter(afterEvent)
+      return {
+        result: afterEvent.result,
+        ...(afterEvent.output !== undefined ? { output: afterEvent.output } : {}),
+        ...(afterEvent.outputPaths !== undefined ? { outputPaths: afterEvent.outputPaths } : {}),
+      }
     })
 
     return Service.of({
@@ -143,11 +178,11 @@ function whollyDisabled(action: string, rules: PermissionV2.Ruleset) {
 export const node = makeLocationNode({
   service: Service,
   layer,
-  deps: [ToolOutputStore.node],
+  deps: [ToolOutputStore.node, ToolHooks.node],
 })
 
 export const toolsNode = makeLocationNode({
   service: Tools.Service,
   layer,
-  deps: [ToolOutputStore.node],
+  deps: [ToolOutputStore.node, ToolHooks.node],
 })

packages/core/test/config/agent.test.ts

@@ -173,6 +173,7 @@ describe("ConfigAgentPlugin.Plugin", () => {
         model: { providerID: "anthropic", id: "claude-sonnet", variant: undefined },
       })
       expect(reviewer.request).toEqual({
+        settings: {},
         headers: { first: "one", shared: "last", second: "two" },
         body: { enabled: true, profile: "review", retries: 2, effort: "high" },
       })

packages/core/test/instruction-context.test.ts

@@ -10,7 +10,6 @@ import { InstructionContext } from "@opencode-ai/core/instruction-context"
 import { Location } from "@opencode-ai/core/location"
 import { AbsolutePath } from "@opencode-ai/core/schema"
 import { SystemContext } from "@opencode-ai/core/system-context"
-import { SystemContextRegistry } from "@opencode-ai/core/system-context/registry"
 import { location } from "./fixture/location"
 import { tmpdir } from "./fixture/tmpdir"
 import { testEffect } from "./lib/effect"
@@ -22,7 +21,7 @@ const instructionLayer = (input: {
   locationServiceLayer: Layer.Layer<Location.Service>
   filesystemLayer?: Layer.Layer<FSUtil.Service>
 }) =>
-  AppNodeBuilder.build(LayerNode.group([SystemContextRegistry.node, InstructionContext.node]), [
+  AppNodeBuilder.build(InstructionContext.node, [
     [Global.node, Global.layerWith({ config: input.config })],
     [Location.node, input.locationServiceLayer],
     ...(input.filesystemLayer ? [[FSUtil.node, input.filesystemLayer] as const] : []),
@@ -52,7 +51,7 @@ describe("InstructionContext", () => {
             await fs.writeFile(packageFile, "package")
           })
 
-          const load = SystemContextRegistry.Service.pipe(
+          const load = InstructionContext.Service.pipe(
             Effect.flatMap((service) => service.load()),
             Effect.provide(
               instructionLayer({
@@ -71,23 +70,23 @@ describe("InstructionContext", () => {
           )
 
           const initialized = yield* SystemContext.initialize(yield* load)
-          expect(initialized.baseline).toBe(
+          expect(initialized.text).toBe(
             [
               `Instructions from: ${globalFile}\nglobal`,
               `Instructions from: ${packageFile}\npackage`,
               `Instructions from: ${projectFile}\nproject`,
             ].join("\n\n"),
           )
-          expect(initialized.baseline).not.toContain("outside")
+          expect(initialized.text).not.toContain("outside")
 
           yield* Effect.promise(() => fs.writeFile(packageFile, "changed"))
-          expect(yield* SystemContext.reconcile(yield* load, initialized.snapshot)).toMatchObject({
+          expect(yield* SystemContext.reconcile(yield* load, initialized.applied)).toMatchObject({
             _tag: "Updated",
             text: expect.stringContaining(`Instructions from: ${packageFile}\nchanged`),
           })
 
           yield* Effect.promise(() => fs.rm(packageFile))
-          const partial = yield* SystemContext.reconcile(yield* load, initialized.snapshot)
+          const partial = yield* SystemContext.reconcile(yield* load, initialized.applied)
           expect(partial).toEqual({
             _tag: "Updated",
             text: [
@@ -95,14 +94,14 @@ describe("InstructionContext", () => {
               `Instructions from: ${globalFile}\nglobal`,
               `Instructions from: ${projectFile}\nproject`,
             ].join("\n\n"),
-            snapshot: expect.any(Object),
+            applied: expect.any(Object),
           })
 
           yield* Effect.promise(() => Promise.all([fs.rm(globalFile), fs.rm(projectFile)]))
-          expect(yield* SystemContext.reconcile(yield* load, initialized.snapshot)).toEqual({
+          expect(yield* SystemContext.reconcile(yield* load, initialized.applied)).toEqual({
             _tag: "Updated",
             text: "Previously loaded instructions no longer apply.",
-            snapshot: {},
+            applied: {},
           })
         }),
       ),
@@ -118,7 +117,7 @@ describe("InstructionContext", () => {
         Effect.gen(function* () {
           const file = path.join(tmp.path, "AGENTS.md")
           yield* Effect.promise(() => fs.writeFile(file, ""))
-          const context = yield* SystemContextRegistry.Service.pipe(
+          const context = yield* InstructionContext.Service.pipe(
             Effect.flatMap((service) => service.load()),
             Effect.provide(
               instructionLayer({
@@ -131,7 +130,7 @@ describe("InstructionContext", () => {
             ),
           )
 
-          expect((yield* SystemContext.initialize(context)).baseline).toBe(`Instructions from: ${file}\n`)
+          expect((yield* SystemContext.initialize(context)).text).toBe(`Instructions from: ${file}\n`)
         }),
       ),
     ),
@@ -147,7 +146,7 @@ describe("InstructionContext", () => {
           ),
         ),
       ).pipe(Layer.provide(LayerNode.compile(FSUtil.node)))
-      const context = yield* SystemContextRegistry.Service.pipe(
+      const context = yield* InstructionContext.Service.pipe(
         Effect.flatMap((service) => service.load()),
         Effect.provide(
           instructionLayer({
@@ -187,7 +186,7 @@ describe("InstructionContext", () => {
           ),
         ),
       ).pipe(Layer.provide(LayerNode.compile(FSUtil.node)))
-      const context = yield* SystemContextRegistry.Service.pipe(
+      const context = yield* InstructionContext.Service.pipe(
         Effect.flatMap((service) => service.load()),
         Effect.provide(
           instructionLayer({
@@ -231,7 +230,7 @@ describe("InstructionContext", () => {
         ),
       ).pipe(Layer.provide(LayerNode.compile(FSUtil.node)))
 
-      yield* SystemContextRegistry.Service.pipe(
+      yield* InstructionContext.Service.pipe(
         Effect.flatMap((service) => service.load()),
         Effect.provide(
           instructionLayer({
@@ -261,7 +260,7 @@ describe("InstructionContext", () => {
       let scanned = false
       process.env.OPENCODE_DISABLE_PROJECT_CONFIG = "1"
 
-      yield* SystemContextRegistry.Service.pipe(
+      yield* InstructionContext.Service.pipe(
         Effect.flatMap((service) => service.load()),
         Effect.provide(
           instructionLayer({
@@ -293,7 +292,7 @@ describe("InstructionContext", () => {
   it.effect("does not discover project instructions outside the canonical project root", () =>
     Effect.gen(function* () {
       let scanned = false
-      yield* SystemContextRegistry.Service.pipe(
+      yield* InstructionContext.Service.pipe(
         Effect.flatMap((service) => service.load()),
         Effect.provide(
           instructionLayer({

packages/core/test/location-layer.test.ts

@@ -24,9 +24,7 @@ import { EventV2 } from "../src/event"
 import { Reference } from "../src/reference"
 import { ToolRegistry } from "../src/tool/registry"
 
-const it = testEffect(
-  AppNodeBuilder.build(LayerNode.group([Database.node, EventV2.node, LocationServiceMap.node])),
-)
+const it = testEffect(AppNodeBuilder.build(LayerNode.group([Database.node, EventV2.node, LocationServiceMap.node])))
 
 describe("LocationServiceMap", () => {
   it.live("reuses cached services for constructed and decoded location refs", () =>
@@ -75,6 +73,7 @@ describe("LocationServiceMap", () => {
               const catalog = yield* Catalog.Service
               yield* catalog.transform((editor) => editor.provider.update(ProviderV2.ID.make("test"), () => {}))
               const registry = yield* ToolRegistry.Service
+              yield* waitForTool(registry, "glob")
               yield* waitForTool(registry, "shell")
               yield* waitForTool(registry, "subagent")
               return {

packages/core/test/plugin.test.ts

@@ -3,6 +3,8 @@ import { Effect, Exit, Fiber, Schema } from "effect"
 import { define } from "@opencode-ai/plugin/v2/effect"
 import { AgentV2 } from "@opencode-ai/core/agent"
 import { PluginV2 } from "@opencode-ai/core/plugin"
+import { SessionV2 } from "@opencode-ai/core/session"
+import { SessionMessage } from "@opencode-ai/core/session/message"
 import { Tool } from "@opencode-ai/core/tool/tool"
 import { ToolRegistry } from "@opencode-ai/core/tool/registry"
 import { testEffect } from "./lib/effect"
@@ -102,4 +104,68 @@ describe("PluginV2", () => {
       )
     }),
   )
+
+  it.effect("fires before/after tool hooks with mutable events around settlement", () =>
+    Effect.gen(function* () {
+      const plugins = yield* PluginV2.Service
+      const registry = yield* ToolRegistry.Service
+      const executed: unknown[] = []
+      const seen: {
+        before?: unknown
+        after?: { input: unknown; result: unknown; output: unknown }
+      } = {}
+
+      const plugin = define({
+        id: "tool-hooks",
+        effect: (ctx) =>
+          Effect.gen(function* () {
+            yield* ctx.tool
+              .register({
+                echo: Tool.make({
+                  description: "Echo",
+                  input: Schema.Struct({ text: Schema.String }),
+                  output: Schema.Struct({ text: Schema.String }),
+                  execute: ({ text }) => Effect.sync(() => executed.push({ text })).pipe(Effect.as({ text })),
+                }),
+              })
+              .pipe(Effect.orDie)
+
+            yield* ctx.tool.execute
+              .before((event) => {
+                seen.before = event.input
+                event.input = { text: "before-mutated" }
+              })
+              .pipe(Effect.asVoid)
+
+            yield* ctx.tool.execute
+              .after((event) => {
+                seen.after = { input: event.input, result: event.result, output: event.output }
+                event.result = { type: "text", value: "after-mutated" }
+                event.output = { structured: { rewritten: true }, content: [] }
+              })
+              .pipe(Effect.asVoid)
+          }),
+      })
+
+      yield* plugins.add(PluginV2.ID.make(plugin.id), plugin.effect)
+
+      const materialized = yield* registry.materialize({ model: testModel })
+      const settlement = yield* materialized.settle({
+        sessionID: SessionV2.ID.make("ses_hooks"),
+        agent: AgentV2.ID.make("build"),
+        assistantMessageID: SessionMessage.ID.make("msg_hooks"),
+        call: { type: "tool-call", id: "call-hooks", name: "echo", input: { text: "original" } },
+      })
+
+      expect(seen.before).toEqual({ text: "original" })
+      expect(executed).toEqual([{ text: "before-mutated" }])
+      expect(seen.after).toEqual({
+        input: { text: "before-mutated" },
+        result: { type: "json", value: { text: "before-mutated" } },
+        output: { structured: { text: "before-mutated" }, content: [] },
+      })
+      expect(settlement.result).toEqual({ type: "text", value: "after-mutated" })
+      expect(settlement.output).toEqual({ structured: { rewritten: true }, content: [] })
+    }),
+  )
 })

packages/core/test/plugin/fixture.ts

@@ -16,6 +16,7 @@ import { PluginV2 } from "@opencode-ai/core/plugin"
 import { PluginRuntime } from "@opencode-ai/core/plugin/runtime"
 import { Reference } from "@opencode-ai/core/reference"
 import { SkillV2 } from "@opencode-ai/core/skill"
+import { ToolHooks } from "@opencode-ai/core/tool/hooks"
 import { ToolRegistry } from "@opencode-ai/core/tool/registry"
 import { Effect, Layer } from "effect"
 import { tempLocationLayer } from "../fixture/location"
@@ -47,6 +48,7 @@ export const PluginTestLayer = AppNodeBuilder.build(
     PluginRuntime.node,
     Reference.node,
     SkillV2.node,
+    ToolHooks.node,
     ToolRegistry.toolsNode,
   ]),
   [

packages/core/test/plugin/fixtures/models-dev-reasoning.json

@@ -0,0 +1,67 @@
+{
+  "openai": {
+    "id": "openai",
+    "name": "OpenAI",
+    "env": ["OPENAI_API_KEY"],
+    "npm": "@ai-sdk/openai",
+    "api": "https://api.openai.com/v1",
+    "models": {
+      "gpt-reasoning": {
+        "id": "gpt-reasoning",
+        "name": "GPT Reasoning",
+        "release_date": "2026-01-01",
+        "attachment": false,
+        "reasoning": true,
+        "reasoning_options": [
+          { "type": "effort", "values": ["low", "high"] },
+          { "type": "budget_tokens", "min": 1024, "max": 64000 },
+          { "type": "toggle" }
+        ],
+        "temperature": true,
+        "tool_call": true,
+        "limit": { "context": 128000, "output": 8192 },
+        "experimental": {
+          "modes": {
+            "high": {
+              "provider": {
+                "headers": { "x-mode": "high" },
+                "body": { "service_tier": "priority" }
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  "anthropic": {
+    "id": "anthropic",
+    "name": "Anthropic",
+    "env": ["ANTHROPIC_API_KEY"],
+    "npm": "@ai-sdk/anthropic",
+    "api": "https://api.anthropic.com/v1",
+    "models": {
+      "claude-budget": {
+        "id": "claude-budget",
+        "name": "Claude Budget",
+        "release_date": "2026-01-01",
+        "attachment": false,
+        "reasoning": true,
+        "reasoning_options": [{ "type": "budget_tokens", "min": 1024, "max": 64000 }],
+        "temperature": true,
+        "tool_call": true,
+        "limit": { "context": 128000, "output": 8192 }
+      },
+      "claude-effort": {
+        "id": "claude-effort",
+        "name": "Claude Effort",
+        "release_date": "2026-01-01",
+        "attachment": false,
+        "reasoning": true,
+        "reasoning_options": [{ "type": "effort", "values": ["low"] }],
+        "temperature": true,
+        "tool_call": true,
+        "limit": { "context": 128000, "output": 8192 }
+      }
+    }
+  }
+}

packages/core/test/plugin/host.ts

@@ -52,6 +52,10 @@ export function host(overrides: Overrides = {}): PluginContext {
     },
     tool: overrides.tool ?? {
       register: () => Effect.die("unused tool.register"),
+      execute: {
+        before: () => Effect.die("unused tool.execute.before"),
+        after: () => Effect.die("unused tool.execute.after"),
+      },
     },
     session: overrides.session ?? {
       create: () => Effect.die("unused session.create"),
@@ -275,7 +279,11 @@ function agentInfo(value: AgentV2.Info) {
   return {
     ...value,
     model: value.model && { ...value.model },
-    request: { headers: { ...value.request.headers }, body: { ...value.request.body } },
+    request: {
+      settings: { ...value.request.settings },
+      headers: { ...value.request.headers },
+      body: { ...value.request.body },
+    },
     permissions: value.permissions.map((permission) => ({ ...permission })),
   }
 }
@@ -284,7 +292,11 @@ function providerInfo(value: ProviderV2.MutableInfo) {
   return {
     ...value,
     api: { ...value.api, settings: value.api.settings && { ...value.api.settings } },
-    request: { headers: { ...value.request.headers }, body: { ...value.request.body } },
+    request: {
+      settings: { ...value.request.settings },
+      headers: { ...value.request.headers },
+      body: { ...value.request.body },
+    },
   }
 }
 
@@ -299,11 +311,13 @@ function modelInfo(value: ModelV2.Info | ModelV2.MutableInfo) {
     },
     request: {
       ...value.request,
+      settings: { ...value.request.settings },
       headers: { ...value.request.headers },
       body: { ...value.request.body },
     },
     variants: value.variants.map((variant) => ({
       ...variant,
+      settings: { ...variant.settings },
       headers: { ...variant.headers },
       body: { ...variant.body },
     })),

packages/core/test/plugin/models-dev.test.ts

@@ -168,14 +168,14 @@ describe("ModelsDevPlugin", () => {
     ),
   )
 
-  it.effect("derives OpenAI reasoning variants from models.dev reasoning options", () =>
+  it.effect("converts reasoning options into settings variants", () =>
     Effect.acquireUseRelease(
       Effect.sync(() => {
         const previous = {
           path: Flag.OPENCODE_MODELS_PATH,
           disabled: Flag.OPENCODE_DISABLE_MODELS_FETCH,
         }
-        Flag.OPENCODE_MODELS_PATH = path.join(import.meta.dir, "fixtures", "models-dev.json")
+        Flag.OPENCODE_MODELS_PATH = path.join(import.meta.dir, "fixtures", "models-dev-reasoning.json")
         Flag.OPENCODE_DISABLE_MODELS_FETCH = true
         return previous
       }),
@@ -183,17 +183,6 @@ describe("ModelsDevPlugin", () => {
         Effect.gen(function* () {
           const catalog = yield* Catalog.Service
           const integrations = yield* Integration.Service
-          yield* catalog.transform((catalog) => {
-            catalog.model.update(ProviderV2.ID.opencode, ModelV2.ID.make("gpt-5.5"), (model) => {
-              model.variants = [
-                {
-                  id: ModelV2.VariantID.make("high"),
-                  headers: { custom: "true" },
-                  body: { custom: true },
-                },
-              ]
-            })
-          })
           yield* ModelsDevPlugin.effect(
             host({
               catalog: catalogHost(catalog),
@@ -201,42 +190,67 @@ describe("ModelsDevPlugin", () => {
             }),
           )
 
-          expect((yield* catalog.model.get(ProviderV2.ID.opencode, ModelV2.ID.make("gpt-5.5")))?.variants).toEqual([
-            {
-              id: ModelV2.VariantID.make("none"),
-              headers: {},
-              body: {
-                include: ["reasoning.encrypted_content"],
-                reasoning: { effort: "none", summary: "auto" },
-              },
-            },
-            expect.objectContaining({
-              id: "low",
-              body: {
-                include: ["reasoning.encrypted_content"],
-                reasoning: { effort: "low", summary: "auto" },
-              },
-            }),
-            expect.objectContaining({
-              id: "medium",
-              body: {
-                include: ["reasoning.encrypted_content"],
-                reasoning: { effort: "medium", summary: "auto" },
-              },
-            }),
-            expect.objectContaining({
-              id: "high",
-              headers: { custom: "true" },
-              body: { custom: true },
-            }),
-            expect.objectContaining({
-              id: "xhigh",
-              body: {
-                include: ["reasoning.encrypted_content"],
-                reasoning: { effort: "xhigh", summary: "auto" },
-              },
-            }),
+          const model = yield* catalog.model.get(ProviderV2.ID.openai, ModelV2.ID.make("gpt-reasoning"))
+          expect(model?.variants.map((variant) => variant.id)).toEqual([
+            ModelV2.VariantID.make("low"),
+            ModelV2.VariantID.make("high"),
           ])
+          expect(model?.variants).toContainEqual({
+            id: ModelV2.VariantID.make("low"),
+            settings: {
+              reasoningEffort: "low",
+              reasoningSummary: "auto",
+              include: ["reasoning.encrypted_content"],
+            },
+            headers: {},
+            body: {},
+          })
+          expect(model?.variants).toContainEqual({
+            id: ModelV2.VariantID.make("high"),
+            settings: {
+              reasoningEffort: "high",
+              reasoningSummary: "auto",
+              include: ["reasoning.encrypted_content"],
+            },
+            headers: {},
+            body: {},
+          })
+
+          const mode = yield* catalog.model.get(ProviderV2.ID.openai, ModelV2.ID.make("gpt-reasoning-high"))
+          expect(mode).toMatchObject({
+            id: "gpt-reasoning-high",
+            name: "GPT Reasoning High",
+            request: {
+              headers: { "x-mode": "high" },
+              body: { service_tier: "priority" },
+            },
+          })
+          expect(mode?.variants.map((variant) => variant.id)).toEqual([
+            ModelV2.VariantID.make("low"),
+            ModelV2.VariantID.make("high"),
+          ])
+
+          const budgetModel = yield* catalog.model.get(ProviderV2.ID.anthropic, ModelV2.ID.make("claude-budget"))
+          expect(budgetModel?.variants).toContainEqual({
+            id: ModelV2.VariantID.make("high"),
+            settings: { thinking: { type: "enabled", budgetTokens: 16000 } },
+            headers: {},
+            body: {},
+          })
+          expect(budgetModel?.variants).toContainEqual({
+            id: ModelV2.VariantID.make("max"),
+            settings: { thinking: { type: "enabled", budgetTokens: 64000 } },
+            headers: {},
+            body: {},
+          })
+
+          const anthropicEffortModel = yield* catalog.model.get(ProviderV2.ID.anthropic, ModelV2.ID.make("claude-effort"))
+          expect(anthropicEffortModel?.variants).toContainEqual({
+            id: ModelV2.VariantID.make("low"),
+            settings: { thinking: { type: "adaptive", display: "summarized" }, effort: "low" },
+            headers: {},
+            body: {},
+          })
         }).pipe(Effect.provide(AppNodeBuilder.build(ModelsDev.node))),
       (previous) =>
         Effect.sync(() => {
@@ -245,5 +259,4 @@ describe("ModelsDevPlugin", () => {
         }),
     ),
   )
-
 })

packages/core/test/plugin/provider-amazon-bedrock.test.ts

@@ -93,7 +93,7 @@ describe("AmazonBedrockPlugin", () => {
         })
         catalog.provider.update(bedrock.id, (item) => {
           item.api = bedrock.api
-          item.request = bedrock.request
+          item.request = { settings: {}, headers: {}, body: { endpoint: "https://bedrock.example" } }
         })
       })
       yield* addPlugin()

packages/core/test/plugin/provider-anthropic.test.ts

@@ -36,7 +36,7 @@ describe("AnthropicPlugin", () => {
         })
         catalog.provider.update(item.id, (draft) => {
           draft.api = item.api
-          draft.request = item.request
+          draft.request = { settings: {}, headers: { Existing: "1" }, body: {} }
         })
       })
       yield* addPlugin()

packages/core/test/plugin/provider-azure.test.ts

@@ -87,7 +87,7 @@ describe("AzurePlugin", () => {
           })
           catalog.provider.update(azure.id, (item) => {
             item.api = azure.api
-            item.request = azure.request
+            item.request = { settings: {}, headers: {}, body: { resourceName: "from-config" } }
           })
           catalog.provider.update(ProviderV2.ID.openai, () => {})
         })
@@ -110,7 +110,7 @@ describe("AzurePlugin", () => {
           })
           catalog.provider.update(azure.id, (item) => {
             item.api = azure.api
-            item.request = azure.request
+            item.request = { settings: {}, headers: {}, body: { resourceName: "" } }
           })
         })
         yield* addPlugin()
@@ -131,7 +131,7 @@ describe("AzurePlugin", () => {
           })
           catalog.provider.update(azure.id, (item) => {
             item.api = azure.api
-            item.request = azure.request
+            item.request = { settings: {}, headers: {}, body: { resourceName: "   " } }
           })
         })
         yield* addPlugin()

packages/core/test/plugin/provider-kilo.test.ts

@@ -32,7 +32,7 @@ describe("KiloPlugin", () => {
             package: "@ai-sdk/openai-compatible",
             url: "https://api.kilo.ai/api/gateway",
           }
-          provider.request = { headers: { Existing: "value" }, body: {} }
+          provider.request = { settings: {}, headers: { Existing: "value" }, body: {} }
         })
         catalog.provider.update(ProviderV2.ID.openrouter, () => {})
       })

packages/core/test/plugin/provider-llmgateway.test.ts

@@ -39,7 +39,7 @@ describe("LLMGatewayPlugin", () => {
             package: "@ai-sdk/openai-compatible",
             url: "https://api.llmgateway.io/v1",
           }
-          provider.request = { headers: { Existing: "value" }, body: {} }
+          provider.request = { settings: {}, headers: { Existing: "value" }, body: {} }
         })
         catalog.provider.update(ProviderV2.ID.openrouter, () => {})
       })

packages/core/test/plugin/provider-nvidia.test.ts

@@ -32,7 +32,7 @@ describe("NvidiaPlugin", () => {
             package: "@ai-sdk/openai-compatible",
             url: "https://integrate.api.nvidia.com/v1",
           }
-          provider.request = { headers: { Existing: "value" }, body: {} }
+          provider.request = { settings: {}, headers: { Existing: "value" }, body: {} }
         })
         catalog.provider.update(ProviderV2.ID.openrouter, () => {})
       })
@@ -80,6 +80,7 @@ describe("NvidiaPlugin", () => {
             url: "https://integrate.api.nvidia.com/v1",
           }
           provider.request = {
+            settings: {},
             headers: { "X-BILLING-INVOKE-ORIGIN": "CustomOrigin" },
             body: { baseURL: "https://integrate.api.nvidia.com/v1" },
           }

packages/core/test/plugin/provider-openai.test.ts

@@ -3,6 +3,7 @@ import { describe, expect } from "bun:test"
 import type { LanguageModelV3 } from "@ai-sdk/provider"
 import { Effect } from "effect"
 import { Catalog } from "@opencode-ai/core/catalog"
+import { Credential } from "@opencode-ai/core/credential"
 import { Integration } from "@opencode-ai/core/integration"
 import { ModelV2 } from "@opencode-ai/core/model"
 import { PluginV2 } from "@opencode-ai/core/plugin"
@@ -27,6 +28,20 @@ function required<T>(value: T | undefined): T {
   return value
 }
 
+function eventually<A>(
+  effect: Effect.Effect<A>,
+  predicate: (value: A) => boolean,
+  remaining = 1000,
+): Effect.Effect<A, Error> {
+  return Effect.gen(function* () {
+    const value = yield* effect
+    if (predicate(value)) return value
+    if (remaining === 0) return yield* Effect.fail(new Error("Timed out waiting for value"))
+    yield* Effect.promise(() => Bun.sleep(1))
+    return yield* eventually(effect, predicate, remaining - 1)
+  })
+}
+
 function fakeSelectorSdk(calls: string[]) {
   const make = (method: string) => (id: string) => {
     calls.push(`${method}:${id}`)
@@ -153,6 +168,80 @@ describe("OpenAIPlugin", () => {
     }),
   )
 
+  it.effect("filters the OpenAI catalog to codex-eligible models under a ChatGPT connection", () =>
+    Effect.gen(function* () {
+      const catalog = yield* Catalog.Service
+      const credentials = yield* Credential.Service
+      yield* catalog.transform((catalog) => {
+        const item = ProviderV2.Info.make({
+          ...ProviderV2.Info.empty(ProviderV2.ID.openai),
+          api: { type: "aisdk", package: "@ai-sdk/openai" },
+        })
+        catalog.provider.update(item.id, (draft) => {
+          draft.api = item.api
+        })
+        catalog.model.update(item.id, ModelV2.ID.make("gpt-5.5"), (model) => {
+          model.cost = [{ input: 1, output: 2, cache: { read: 0.1, write: 0 } }]
+        })
+        catalog.model.update(item.id, ModelV2.ID.make("gpt-5.5-pro"), () => {})
+        catalog.model.update(item.id, ModelV2.ID.make("gpt-4.1"), () => {})
+      })
+      yield* credentials.create({
+        integrationID: Integration.ID.make("openai"),
+        value: Credential.OAuth.make({
+          type: "oauth",
+          methodID: Integration.MethodID.make("chatgpt-browser"),
+          access: "chatgpt-token",
+          refresh: "refresh",
+          expires: Date.now() + 60_000,
+          metadata: { accountID: "acct_123" },
+        }),
+      })
+      yield* addPlugin()
+
+      const eligible = required(
+        yield* eventually(
+          catalog.model.get(ProviderV2.ID.openai, ModelV2.ID.make("gpt-5.5")),
+          (model) => model?.cost.length === 0,
+        ),
+      )
+      expect(eligible.enabled).toBe(true)
+      expect(required(yield* catalog.model.get(ProviderV2.ID.openai, ModelV2.ID.make("gpt-5.5-pro"))).enabled).toBe(
+        false,
+      )
+      expect(required(yield* catalog.model.get(ProviderV2.ID.openai, ModelV2.ID.make("gpt-4.1"))).enabled).toBe(false)
+    }),
+  )
+
+  it.effect("keeps the full OpenAI catalog under an API key connection", () =>
+    Effect.gen(function* () {
+      const catalog = yield* Catalog.Service
+      const credentials = yield* Credential.Service
+      yield* catalog.transform((catalog) => {
+        const item = ProviderV2.Info.make({
+          ...ProviderV2.Info.empty(ProviderV2.ID.openai),
+          api: { type: "aisdk", package: "@ai-sdk/openai" },
+        })
+        catalog.provider.update(item.id, (draft) => {
+          draft.api = item.api
+        })
+        catalog.model.update(item.id, ModelV2.ID.make("gpt-5.5"), () => {})
+        catalog.model.update(item.id, ModelV2.ID.make("gpt-4.1"), () => {})
+      })
+      yield* credentials.create({
+        integrationID: Integration.ID.make("openai"),
+        value: Credential.Key.make({ type: "key", key: "sk-test" }),
+      })
+      yield* addPlugin()
+      // The connection refresh is asynchronous; give it time to settle before
+      // asserting nothing was filtered.
+      yield* Effect.promise(() => Bun.sleep(25))
+
+      expect(required(yield* catalog.model.get(ProviderV2.ID.openai, ModelV2.ID.make("gpt-5.5"))).enabled).toBe(true)
+      expect(required(yield* catalog.model.get(ProviderV2.ID.openai, ModelV2.ID.make("gpt-4.1"))).enabled).toBe(true)
+    }),
+  )
+
   it.effect("does not disable gpt-5-chat-latest for non-OpenAI providers", () =>
     Effect.gen(function* () {
       const catalog = yield* Catalog.Service

packages/core/test/plugin/provider-opencode.test.ts

@@ -142,6 +142,7 @@ describe("OpencodePlugin", () => {
               model.variants = [
                 {
                   id: ModelV2.VariantID.make("custom"),
+                  settings: {},
                   headers: { "x-custom": "true" },
                   body: { custom: true },
                 },
@@ -177,7 +178,7 @@ describe("OpencodePlugin", () => {
               url: `${server.url.origin}/v1`,
             },
           })
-          expect(provider.request).toEqual({ headers: { "x-org-id": "org" }, body: { custom: "value" } })
+          expect(provider.request).toEqual({ settings: {}, headers: { "x-org-id": "org" }, body: { custom: "value" } })
           expect(yield* (yield* Integration.Service).get(Integration.ID.make("remote"))).toBeUndefined()
 
           const model = required(yield* catalog.model.get(ProviderV2.ID.make("remote"), ModelV2.ID.make("model")))
@@ -192,11 +193,13 @@ describe("OpencodePlugin", () => {
           expect(model.variants).toEqual([
             {
               id: ModelV2.VariantID.make("custom"),
+              settings: {},
               headers: { "x-custom": "true" },
               body: { custom: true },
             },
             {
               id: ModelV2.VariantID.make("high"),
+              settings: {},
               headers: {},
               body: { temperature: 0.2 },
             },
@@ -359,6 +362,7 @@ describe("OpencodePlugin", () => {
             ...ProviderV2.Info.empty(ProviderV2.ID.opencode),
             api: { type: "aisdk", package: "test-provider" },
             request: {
+              settings: {},
               headers: {},
               body: { apiKey: "configured" },
             },
@@ -369,7 +373,7 @@ describe("OpencodePlugin", () => {
             cost: cost(1),
           })
           catalog.provider.update(provider.id, (draft) => {
-            draft.request = provider.request
+            draft.request = { settings: {}, headers: {}, body: { apiKey: "configured" } }
           })
           catalog.model.update(provider.id, model.id, (draft) => {
             draft.cost = [...model.cost]

packages/core/test/plugin/provider-openrouter.test.ts

@@ -31,7 +31,7 @@ describe("OpenRouterPlugin", () => {
       yield* catalog.transform((catalog) => {
         catalog.provider.update(ProviderV2.ID.openrouter, (provider) => {
           provider.api = { type: "aisdk", package: "@openrouter/ai-sdk-provider" }
-          provider.request = { headers: { Existing: "value" }, body: {} }
+          provider.request = { settings: {}, headers: { Existing: "value" }, body: {} }
         })
         catalog.provider.update(ProviderV2.ID.make("nvidia"), () => {})
       })

packages/core/test/plugin/variant.test.ts

@@ -37,8 +37,8 @@ describe("VariantPlugin", () => {
       yield* VariantPlugin.Plugin.effect(host({ catalog: catalogHost(service) }))
 
       expect((yield* service.model.get(ProviderV2.ID.opencode, ModelV2.ID.make("glm-5.2")))?.variants).toEqual([
-        expect.objectContaining({ id: "high", body: { reasoning_effort: "high" } }),
-        expect.objectContaining({ id: "max", body: { reasoning_effort: "max" } }),
+        expect.objectContaining({ id: "high", settings: { reasoningEffort: "high" } }),
+        expect.objectContaining({ id: "max", settings: { reasoningEffort: "max" } }),
       ])
     }),
   )
@@ -53,14 +53,14 @@ describe("VariantPlugin", () => {
             type: "aisdk",
             package: "@ai-sdk/openai-compatible",
           }
-          model.variants = [{ id: ModelV2.VariantID.make("high"), headers: { custom: "true" }, body: {} }]
+          model.variants = [{ id: ModelV2.VariantID.make("high"), settings: {}, headers: { custom: "true" }, body: {} }]
         })
       })
       yield* VariantPlugin.Plugin.effect(host({ catalog: catalogHost(service) }))
 
       expect((yield* service.model.get(ProviderV2.ID.opencode, ModelV2.ID.make("glm-5.2")))?.variants).toEqual([
         expect.objectContaining({ id: "high", headers: { custom: "true" } }),
-        expect.objectContaining({ id: "max", body: { reasoning_effort: "max" } }),
+        expect.objectContaining({ id: "max", settings: { reasoningEffort: "max" } }),
       ])
     }),
   )

packages/core/test/reference-guidance.test.ts

@@ -16,10 +16,10 @@ describe("ReferenceGuidance", () => {
       const guidance = yield* ReferenceGuidance.Service
       const generation = yield* SystemContext.initialize(yield* guidance.load())
 
-      expect(generation.baseline).toContain("<available_references>")
-      expect(generation.baseline).toContain("<name>docs</name>")
-      expect(generation.baseline).toContain("<path>/docs</path>")
-      expect(generation.baseline).toContain("<description>Use for product documentation</description>")
+      expect(generation.text).toContain("<available_references>")
+      expect(generation.text).toContain("<name>docs</name>")
+      expect(generation.text).toContain("<path>/docs</path>")
+      expect(generation.text).toContain("<description>Use for product documentation</description>")
     }).pipe(
       Effect.provide(
         guidanceLayer(
@@ -47,7 +47,7 @@ describe("ReferenceGuidance", () => {
     Effect.gen(function* () {
       const guidance = yield* ReferenceGuidance.Service
       const generation = yield* SystemContext.initialize(yield* guidance.load())
-      expect(generation.baseline).toBe("")
+      expect(generation.text).toBe("")
     }).pipe(Effect.provide(guidanceLayer(Layer.mock(Reference.Service, { list: () => Effect.succeed([]) })))),
   )
 
@@ -55,7 +55,7 @@ describe("ReferenceGuidance", () => {
     Effect.gen(function* () {
       const guidance = yield* ReferenceGuidance.Service
       const generation = yield* SystemContext.initialize(yield* guidance.load())
-      expect(generation.baseline).toBe("")
+      expect(generation.text).toBe("")
     }).pipe(
       Effect.provide(
         guidanceLayer(
@@ -73,4 +73,41 @@ describe("ReferenceGuidance", () => {
       ),
     ),
   )
+
+  it.effect("announces added and removed references as deltas", () => {
+    const reference = (name: string, description: string) =>
+      new Reference.Info({
+        name,
+        path: AbsolutePath.make(`/${name}`),
+        description,
+        source: Reference.LocalSource.make({ type: "local", path: AbsolutePath.make(`/${name}`), description }),
+      })
+    let references = [reference("docs", "Use for product documentation")]
+    return Effect.gen(function* () {
+      const guidance = yield* ReferenceGuidance.Service
+      const initialized = yield* SystemContext.initialize(yield* guidance.load())
+
+      references = [reference("docs", "Use for product documentation"), reference("examples", "Use for examples")]
+      const added = yield* SystemContext.reconcile(yield* guidance.load(), initialized.applied)
+      expect(added).toMatchObject({
+        _tag: "Updated",
+        text: [
+          "New project references are available in addition to those previously listed:",
+          "  <reference>",
+          "    <name>examples</name>",
+          "    <path>/examples</path>",
+          "    <description>Use for examples</description>",
+          "  </reference>",
+        ].join("\n"),
+      })
+
+      references = [reference("examples", "Use for examples")]
+      expect(
+        yield* SystemContext.reconcile(yield* guidance.load(), added._tag === "Updated" ? added.applied : {}),
+      ).toMatchObject({
+        _tag: "Updated",
+        text: "The following project references are no longer available and must not be used: docs.",
+      })
+    }).pipe(Effect.provide(guidanceLayer(Layer.mock(Reference.Service, { list: () => Effect.succeed(references) }))))
+  })
 })

packages/core/test/session-instructions.test.ts

@@ -0,0 +1,301 @@
+import { describe, expect, test } from "bun:test"
+import fs from "fs/promises"
+import path from "path"
+import { DateTime, Effect, Layer } from "effect"
+import { Message, Model } from "@opencode-ai/llm"
+import * as OpenAIChat from "@opencode-ai/llm/protocols/openai-chat"
+import { AgentV2 } from "@opencode-ai/core/agent"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
+import { Config } from "@opencode-ai/core/config"
+import { Database } from "@opencode-ai/core/database/database"
+import { EventV2 } from "@opencode-ai/core/event"
+import { FSUtil } from "@opencode-ai/core/fs-util"
+import { Global } from "@opencode-ai/core/global"
+import { Image } from "@opencode-ai/core/image"
+import { Location } from "@opencode-ai/core/location"
+import { LocationMutation } from "@opencode-ai/core/location-mutation"
+import { ModelV2 } from "@opencode-ai/core/model"
+import { PermissionV2 } from "@opencode-ai/core/permission"
+import { ProjectV2 } from "@opencode-ai/core/project"
+import { ProviderV2 } from "@opencode-ai/core/provider"
+import { ReadTool } from "@opencode-ai/core/tool/read"
+import { ReadToolFileSystem } from "@opencode-ai/core/tool/read-filesystem"
+import { SessionEvent } from "@opencode-ai/core/session/event"
+import { SessionExecution } from "@opencode-ai/core/session/execution"
+import { SessionInstructions } from "@opencode-ai/core/session/instructions"
+import { SessionMessage } from "@opencode-ai/core/session/message"
+import { SessionProjector } from "@opencode-ai/core/session/projector"
+import { SessionStore } from "@opencode-ai/core/session/store"
+import { SessionV2 } from "@opencode-ai/core/session"
+import { toLLMMessages } from "@opencode-ai/core/session/runner/to-llm-message"
+import { ToolHooks } from "@opencode-ai/core/tool/hooks"
+import { ToolOutputStore } from "@opencode-ai/core/tool-output-store"
+import { ToolRegistry } from "@opencode-ai/core/tool/registry"
+import { tempLocationLayer } from "./fixture/location"
+import { testEffect } from "./lib/effect"
+import { settleTool, testModel } from "./lib/tool"
+
+const projects = Layer.succeed(
+  ProjectV2.Service,
+  ProjectV2.Service.of({
+    resolve: (directory) => Effect.succeed({ id: ProjectV2.ID.global, directory }),
+    directories: () => Effect.succeed([]),
+    commit: () => Effect.void,
+  }),
+)
+const permission = Layer.succeed(
+  PermissionV2.Service,
+  PermissionV2.Service.of({
+    assert: () => Effect.void,
+    ask: () => Effect.die("unused"),
+    reply: () => Effect.die("unused"),
+    get: () => Effect.die("unused"),
+    forSession: () => Effect.die("unused"),
+    list: () => Effect.die("unused"),
+  }),
+)
+const config = Layer.succeed(Config.Service, Config.Service.of({ entries: () => Effect.succeed([]) }))
+const imageLayer = AppNodeBuilder.build(Image.node, [[Config.node, config]])
+
+const testLayer = AppNodeBuilder.build(
+  LayerNode.group([
+    Database.node,
+    EventV2.node,
+    SessionProjector.node,
+    SessionStore.node,
+    SessionV2.node,
+    Location.node,
+    FSUtil.node,
+    LocationMutation.node,
+    ReadToolFileSystem.node,
+    ReadTool.node,
+    ToolRegistry.node,
+    ToolRegistry.toolsNode,
+    ToolHooks.node,
+    SessionInstructions.node,
+    Global.node,
+    ToolOutputStore.node,
+    Image.node,
+  ]),
+  [
+    [ProjectV2.node, projects],
+    [SessionExecution.node, SessionExecution.noopLayer],
+    [Location.node, tempLocationLayer],
+    [PermissionV2.node, permission],
+    [Config.node, config],
+    [Image.node, imageLayer],
+    [ToolOutputStore.node, ToolOutputStore.nodeWithoutConfig],
+  ],
+) as unknown as Layer.Layer<unknown>
+
+const it = testEffect(testLayer)
+
+const identity = {
+  agent: AgentV2.ID.make("build"),
+  assistantMessageID: SessionMessage.ID.make("msg_nearby"),
+}
+const readCall = (sessionID: SessionV2.ID, id: string, readPath: string): ToolRegistry.ExecuteInput => ({
+  sessionID,
+  ...identity,
+  call: { type: "tool-call", id, name: "read", input: { path: readPath } },
+})
+
+const writeAgents = (file: string, content: string) => Effect.promise(() => fs.writeFile(file, content))
+const mkdir = (dir: string) => Effect.promise(() => fs.mkdir(dir, { recursive: true }))
+
+const synthetics = (sessionID: SessionV2.ID) =>
+  Effect.gen(function* () {
+    const store = yield* SessionStore.Service
+    return (yield* store.context(sessionID)).filter((message) => message.type === "synthetic")
+  })
+
+// Seed a prior synthetic message with an instruction dedup ledger, simulating a prior turn
+// after the Location layer was reopened (in-memory set empty).
+const seedSynthetic = (sessionID: SessionV2.ID, paths: string[]) =>
+  Effect.gen(function* () {
+    const events = yield* EventV2.Service
+    yield* events.publish(SessionEvent.Synthetic, {
+      sessionID,
+      messageID: SessionMessage.ID.create(),
+      timestamp: yield* DateTime.now,
+      text: `Instructions from: ${paths[0]}\nprior`,
+      description: `Loaded ${paths[0]}`,
+      metadata: { instruction: { paths } },
+    })
+  })
+
+describe("SessionInstructions", () => {
+  it.effect("injects AGENTS.md files above a read, excludes the Location root, and dedups across reads", () =>
+    Effect.gen(function* () {
+      const location = yield* Location.Service
+      const dir = location.directory
+      const rootPath = path.resolve(dir, "AGENTS.md")
+      const subPath = path.resolve(dir, "sub", "AGENTS.md")
+      const deepPath = path.resolve(dir, "sub", "deep", "AGENTS.md")
+      const otherPath = path.resolve(dir, "sub", "other", "AGENTS.md")
+      yield* mkdir(path.dirname(deepPath))
+      yield* mkdir(path.dirname(otherPath))
+      yield* writeAgents(rootPath, "root-instructions")
+      yield* writeAgents(subPath, "sub-instructions")
+      yield* writeAgents(deepPath, "deep-instructions")
+      yield* writeAgents(otherPath, "other-instructions")
+      yield* Effect.promise(() => fs.writeFile(path.resolve(dir, "sub", "deep", "file.txt"), "file content"))
+      yield* Effect.promise(() => fs.writeFile(path.resolve(dir, "sub", "other", "file2.txt"), "file content 2"))
+
+      const session = yield* SessionV2.Service
+      const registry = yield* ToolRegistry.Service
+      const sessionID = (yield* session.create({ location: Location.Ref.make({ directory: dir }) })).id
+
+      // A read deep under sub/ discovers deep and sub AGENTS.md, walking up to but
+      // excluding the Location root (already supplied by the core/instructions baseline).
+      yield* settleTool(registry, readCall(sessionID, "call-deep", "sub/deep/file.txt"))
+
+      const firstInjected = yield* synthetics(sessionID)
+      expect(firstInjected).toHaveLength(1)
+      expect(firstInjected[0]!.text).toBe(
+        `Instructions from: ${deepPath}\ndeep-instructions\n\nInstructions from: ${subPath}\nsub-instructions`,
+      )
+      expect(firstInjected[0]!.description).toBe(`Loaded ${path.relative(dir, deepPath)}, ${path.relative(dir, subPath)}`)
+      // The synthetic's metadata carries the durable dedup ledger.
+      expect(firstInjected[0]!.metadata).toEqual({ instruction: { paths: [deepPath, subPath] } })
+      expect(firstInjected[0]!.text).not.toContain("root-instructions")
+
+      // A sibling read under sub/other discovers only the new AGENTS.md; sub is already
+      // injected for this session so it is not re-emitted, and the root is still excluded.
+      yield* settleTool(registry, readCall(sessionID, "call-other", "sub/other/file2.txt"))
+
+      const secondInjected = yield* synthetics(sessionID)
+      expect(secondInjected).toHaveLength(2)
+      expect(secondInjected[1]!.text).toBe(`Instructions from: ${otherPath}\nother-instructions`)
+      expect(secondInjected[1]!.description).toBe(`Loaded ${path.relative(dir, otherPath)}`)
+      expect(secondInjected[1]!.metadata).toEqual({ instruction: { paths: [otherPath] } })
+      expect(secondInjected.some((message) => message.text.includes("root-instructions"))).toBe(false)
+    }),
+  )
+
+  it.effect("does not re-inject paths already recorded in durable session history", () =>
+    Effect.gen(function* () {
+      const location = yield* Location.Service
+      const dir = location.directory
+      const rootPath = path.resolve(dir, "AGENTS.md")
+      const subPath = path.resolve(dir, "sub", "AGENTS.md")
+      yield* mkdir(path.resolve(dir, "sub"))
+      yield* writeAgents(rootPath, "root-instructions")
+      yield* writeAgents(subPath, "sub-instructions")
+      yield* Effect.promise(() => fs.writeFile(path.resolve(dir, "sub", "file.txt"), "content"))
+
+      const session = yield* SessionV2.Service
+      const registry = yield* ToolRegistry.Service
+      const sessionID = (yield* session.create({ location: Location.Ref.make({ directory: dir }) })).id
+
+      // Seed the durable history with a prior synthetic that already claims sub's AGENTS.md
+      // via the instruction metadata ledger.
+      yield* seedSynthetic(sessionID, [subPath])
+      expect((yield* synthetics(sessionID))).toHaveLength(1)
+
+      yield* settleTool(registry, readCall(sessionID, "call-sub", "sub/file.txt"))
+
+      // The durable claim on the prior synthetic prevents re-injection; no new synthetic.
+      expect((yield* synthetics(sessionID))).toHaveLength(1)
+    }),
+  )
+
+  it.effect("discovers AGENTS.md on a directory listing, including the listed directory's own, and dedups with a later file read", () =>
+    Effect.gen(function* () {
+      const location = yield* Location.Service
+      const dir = location.directory
+      const rootPath = path.resolve(dir, "AGENTS.md")
+      const pkgPath = path.resolve(dir, "packages", "foo", "AGENTS.md")
+      yield* mkdir(path.resolve(dir, "packages", "foo"))
+      yield* writeAgents(rootPath, "root-instructions")
+      yield* writeAgents(pkgPath, "pkg-instructions")
+      yield* Effect.promise(() => fs.writeFile(path.resolve(dir, "packages", "foo", "file.txt"), "content"))
+
+      const session = yield* SessionV2.Service
+      const registry = yield* ToolRegistry.Service
+      const sessionID = (yield* session.create({ location: Location.Ref.make({ directory: dir }) })).id
+
+      // Listing packages/foo/ discovers its own AGENTS.md, walking up to but excluding
+      // the Location root (already supplied by the core/instructions baseline).
+      yield* settleTool(registry, readCall(sessionID, "call-list", "packages/foo"))
+
+      const firstInjected = yield* synthetics(sessionID)
+      expect(firstInjected).toHaveLength(1)
+      expect(firstInjected[0]!.text).toBe(`Instructions from: ${pkgPath}\npkg-instructions`)
+      expect(firstInjected[0]!.description).toBe(`Loaded ${path.relative(dir, pkgPath)}`)
+      expect(firstInjected[0]!.metadata).toEqual({ instruction: { paths: [pkgPath] } })
+      expect(firstInjected[0]!.text).not.toContain("root-instructions")
+
+      // A subsequent file read under the listed directory is a dedup: pkg's AGENTS.md is
+      // already injected for this session, so nothing new is emitted.
+      yield* settleTool(registry, readCall(sessionID, "call-file", "packages/foo/file.txt"))
+
+      expect((yield* synthetics(sessionID))).toHaveLength(1)
+    }),
+  )
+
+  it.effect("listing the Location root directory injects no instructions", () =>
+    Effect.gen(function* () {
+      const location = yield* Location.Service
+      const dir = location.directory
+      const rootPath = path.resolve(dir, "AGENTS.md")
+      const subPath = path.resolve(dir, "sub", "AGENTS.md")
+      yield* mkdir(path.resolve(dir, "sub"))
+      yield* writeAgents(rootPath, "root-instructions")
+      yield* writeAgents(subPath, "sub-instructions")
+
+      const session = yield* SessionV2.Service
+      const registry = yield* ToolRegistry.Service
+      const sessionID = (yield* session.create({ location: Location.Ref.make({ directory: dir }) })).id
+
+      // The walk starts and stops at the Location root: the root AGENTS.md is searched but
+      // dropped by the dirname filter, and up() only walks upward so nested dirs are unseen.
+      yield* settleTool(registry, readCall(sessionID, "call-root-list", "."))
+
+      expect((yield* synthetics(sessionID))).toHaveLength(0)
+    }),
+  )
+
+  it.effect("loads instructions directly without a read", () =>
+    Effect.gen(function* () {
+      const location = yield* Location.Service
+      const dir = location.directory
+      const subPath = path.resolve(dir, "sub", "AGENTS.md")
+      yield* mkdir(path.resolve(dir, "sub"))
+      yield* writeAgents(subPath, "sub-instructions")
+
+      const session = yield* SessionV2.Service
+      const sessionInstructions = yield* SessionInstructions.Service
+      const sessionID = (yield* session.create({ location: Location.Ref.make({ directory: dir }) })).id
+
+      yield* sessionInstructions.load({ sessionID, paths: [subPath] })
+
+      const injected = yield* synthetics(sessionID)
+      expect(injected).toHaveLength(1)
+      expect(injected[0]!.text).toBe(`Instructions from: ${subPath}\nsub-instructions`)
+      expect(injected[0]!.description).toBe(`Loaded ${path.relative(dir, subPath)}`)
+      expect(injected[0]!.metadata).toEqual({ instruction: { paths: [subPath] } })
+    }),
+  )
+
+  test("toLLMMessages does not forward synthetic metadata to the provider", () => {
+    const created = DateTime.makeUnsafe(0)
+    const model = Model.make({ id: "model", provider: "provider", route: OpenAIChat.route })
+    const synthetic = SessionMessage.Synthetic.make({
+      id: SessionMessage.ID.make("msg_synthetic"),
+      type: "synthetic",
+      sessionID: SessionV2.ID.make("ses_test"),
+      text: "Instructions from: /repo/sub/AGENTS.md\ncontent",
+      description: "Loaded /repo/sub/AGENTS.md",
+      metadata: { instruction: { paths: ["/repo/sub/AGENTS.md"] } },
+      time: { created },
+    })
+    const messages = toLLMMessages([synthetic], model)
+    expect(messages).toHaveLength(1)
+    expect(messages[0]!.role).toBe("user")
+    expect(messages[0]!.content).toEqual([{ type: "text", text: "Instructions from: /repo/sub/AGENTS.md\ncontent" }])
+    // Metadata is bookkeeping for the dedup ledger; the model must not see it.
+    expect(messages[0]!.metadata).toBeUndefined()
+  })
+})

packages/core/test/session-projector.test.ts

@@ -19,7 +19,12 @@ import { SessionMessageUpdater } from "@opencode-ai/core/session/message-updater
 import { SessionProjector } from "@opencode-ai/core/session/projector"
 import { SessionExecution } from "@opencode-ai/core/session/execution"
 import { SessionInput } from "@opencode-ai/core/session/input"
-import { SessionInputTable, SessionMessageTable, SessionTable } from "@opencode-ai/core/session/sql"
+import {
+  SessionContextCheckpointTable,
+  SessionInputTable,
+  SessionMessageTable,
+  SessionTable,
+} from "@opencode-ai/core/session/sql"
 import { testEffect } from "./lib/effect"
 import { Snapshot } from "@opencode-ai/core/snapshot"
 
@@ -67,6 +72,10 @@ describe("SessionProjector", () => {
         .insert(SessionMessageTable)
         .values([assistantRow(boundary, 1), assistantRow(SessionMessage.ID.make("msg_later"), 2)])
         .run()
+      yield* db
+        .insert(SessionContextCheckpointTable)
+        .values({ session_id: sessionID, baseline: "baseline", snapshot: {}, baseline_seq: 0 })
+        .run()
       const events = yield* EventV2.Service
       yield* events.publish(SessionEvent.RevertEvent.Staged, {
         sessionID,
@@ -93,6 +102,8 @@ describe("SessionProjector", () => {
       expect(
         (yield* db.select({ id: SessionMessageTable.id }).from(SessionMessageTable).all()).map((row) => row.id),
       ).toEqual([boundary])
+      // A committed revert resets the context checkpoint so the next turn re-initializes.
+      expect(yield* db.select().from(SessionContextCheckpointTable).get().pipe(Effect.orDie)).toBeUndefined()
     }),
   )
 
@@ -248,6 +259,7 @@ describe("SessionProjector", () => {
         messageID: SessionMessage.ID.create(),
         timestamp: created,
         text: "synthetic context",
+        metadata: { source: "projector-test" },
       })
       yield* events.publish(SessionEvent.Shell.Started, {
         sessionID,
@@ -318,6 +330,10 @@ describe("SessionProjector", () => {
         "shell",
         "compaction",
       ])
+      expect(messages.find((message) => message.type === "synthetic")).toMatchObject({
+        text: "synthetic context",
+        metadata: { source: "projector-test" },
+      })
       expect(messages.find((message) => message.type === "shell")).toMatchObject({
         output: "/project",
         time: { completed: DateTime.makeUnsafe(1) },

packages/core/test/session-runner-model.test.ts

@@ -30,6 +30,7 @@ const model = (api: Api, variants: ModelV2.Info["variants"] = []) =>
     api: { id: ModelV2.ID.make("api-test-model"), ...api },
     capabilities: { tools: true, input: ["text"], output: ["text"] },
     request: {
+      settings: {},
       headers: { "x-test": "header" },
       body: { apiKey: "secret", custom_extension: { enabled: true } },
     },
@@ -83,7 +84,7 @@ describe("SessionRunnerModel", () => {
             url: "https://compatible.example/v1",
             settings: { apiKey: "settings-secret", compatibility: "strict" },
           }),
-          request: { headers: {}, body: {} },
+          request: { settings: {}, headers: {}, body: {} },
         }),
       )
       const request = LLM.request({ model: resolved, prompt: "Hello" })
@@ -100,17 +101,17 @@ describe("SessionRunnerModel", () => {
     }),
   )
 
-  it.effect("overlays selected OpenAI Session variant bodies", () =>
+  it.effect("overlays selected OpenAI Session variant settings and bodies", () =>
     Effect.gen(function* () {
       const catalog = model({ type: "aisdk", package: "@ai-sdk/openai", url: "https://openai.example/v1" }, [
         {
           id: ModelV2.VariantID.make("high"),
+          settings: { reasoningEffort: "high" },
           headers: { "x-variant": "high" },
           body: {
             store: false,
             service_tier: "priority",
             temperature: 0.2,
-            reasoning: { effort: "high" },
           },
         },
       ])
@@ -137,7 +138,9 @@ describe("SessionRunnerModel", () => {
         store: false,
         service_tier: "priority",
         temperature: 0.2,
-        reasoning: { effort: "high" },
+      })
+      expect(resolved.route.defaults.providerOptions).toEqual({
+        openai: { store: false, reasoningEffort: "high" },
       })
     }),
   )
@@ -149,6 +152,7 @@ describe("SessionRunnerModel", () => {
         [
           {
             id: ModelV2.VariantID.make("high"),
+            settings: {},
             headers: {},
             body: { store: false, reasoning_effort: "high" },
           },
@@ -205,13 +209,14 @@ describe("SessionRunnerModel", () => {
     }),
   )
 
-  it.effect("overlays selected Anthropic Session variant bodies", () =>
+  it.effect("overlays selected Anthropic Session variant settings", () =>
     Effect.gen(function* () {
       const catalog = model({ type: "aisdk", package: "@ai-sdk/anthropic", url: "https://anthropic.example/v1" }, [
         {
           id: ModelV2.VariantID.make("high"),
+          settings: { thinking: { type: "enabled", budgetTokens: 12000 } },
           headers: {},
-          body: { thinking: { type: "enabled", budget_tokens: 12000 } },
+          body: {},
         },
       ])
       const session = SessionV2.Info.make({
@@ -229,7 +234,9 @@ describe("SessionRunnerModel", () => {
 
       expect(resolved.route.defaults.http?.body).toEqual({
         custom_extension: { enabled: true },
-        thinking: { type: "enabled", budget_tokens: 12000 },
+      })
+      expect(resolved.route.defaults.providerOptions).toEqual({
+        anthropic: { thinking: { type: "enabled", budgetTokens: 12000 } },
       })
     }),
   )
@@ -252,7 +259,7 @@ describe("SessionRunnerModel", () => {
       const resolved = yield* SessionRunnerModel.fromCatalogModel(
         ModelV2.Info.make({
           ...model({ type: "aisdk", package: "@ai-sdk/openai", url: "https://openai.example/v1" }),
-          request: { headers: {}, body: {} },
+          request: { settings: {}, headers: {}, body: {} },
         }),
         Credential.Key.make({ type: "key", key: "secret" }),
       )
@@ -275,7 +282,7 @@ describe("SessionRunnerModel", () => {
       const resolved = yield* SessionRunnerModel.fromCatalogModel(
         ModelV2.Info.make({
           ...model({ type: "aisdk", package: "@ai-sdk/openai", url: "https://openai.example/v1" }),
-          request: { headers: {}, body: { apiKey: "configured-secret" } },
+          request: { settings: {}, headers: {}, body: { apiKey: "configured-secret" } },
         }),
         credential,
       )
@@ -297,7 +304,7 @@ describe("SessionRunnerModel", () => {
       const resolved = yield* SessionRunnerModel.fromCatalogModel(
         ModelV2.Info.make({
           ...model({ type: "aisdk", package: "@ai-sdk/openai", url: "https://openai.example/v1" }),
-          request: { headers: {}, body: {} },
+          request: { settings: {}, headers: {}, body: {} },
         }),
         Credential.OAuth.make({
           type: "oauth",
@@ -313,6 +320,101 @@ describe("SessionRunnerModel", () => {
     }),
   )
 
+  it.effect("routes ChatGPT OAuth credentials to the codex backend", () =>
+    Effect.gen(function* () {
+      const resolved = yield* SessionRunnerModel.fromCatalogModel(
+        ModelV2.Info.make({
+          ...model({ type: "aisdk", package: "@ai-sdk/openai", url: "https://openai.example/v1" }),
+          request: { headers: {}, body: {} },
+        }),
+        Credential.OAuth.make({
+          type: "oauth",
+          methodID: Integration.MethodID.make("chatgpt-browser"),
+          access: "chatgpt-token",
+          refresh: "refresh",
+          expires: Date.now() + 60_000,
+          metadata: { accountID: "acct_123" },
+        }),
+      )
+      const request = LLM.request({ model: resolved, prompt: "Hello" })
+      const headers = yield* resolved.route.auth.apply({
+        request,
+        method: "POST",
+        url: "https://chatgpt.com/backend-api/codex/responses",
+        body: "{}",
+        headers: Headers.empty,
+      })
+
+      expect(resolved.route).toMatchObject({
+        id: "openai-responses",
+        endpoint: { baseURL: "https://chatgpt.com/backend-api/codex" },
+      })
+      expect(headers.authorization).toBe("Bearer chatgpt-token")
+      expect(headers["chatgpt-account-id"]).toBe("acct_123")
+    }),
+  )
+
+  it.effect("routes ChatGPT OAuth credentials without an account id to the codex backend", () =>
+    Effect.gen(function* () {
+      const resolved = yield* SessionRunnerModel.fromCatalogModel(
+        ModelV2.Info.make({
+          ...model({ type: "aisdk", package: "@ai-sdk/openai", url: "https://openai.example/v1" }),
+          request: { headers: {}, body: {} },
+        }),
+        Credential.OAuth.make({
+          type: "oauth",
+          methodID: Integration.MethodID.make("chatgpt-headless"),
+          access: "chatgpt-token",
+          refresh: "refresh",
+          expires: Date.now() + 60_000,
+        }),
+      )
+      const request = LLM.request({ model: resolved, prompt: "Hello" })
+      const headers = yield* resolved.route.auth.apply({
+        request,
+        method: "POST",
+        url: "https://chatgpt.com/backend-api/codex/responses",
+        body: "{}",
+        headers: Headers.empty,
+      })
+
+      expect(resolved.route.endpoint.baseURL).toBe("https://chatgpt.com/backend-api/codex")
+      expect(headers.authorization).toBe("Bearer chatgpt-token")
+      expect(headers["chatgpt-account-id"]).toBeUndefined()
+    }),
+  )
+
+  it.effect("keeps non-ChatGPT OAuth credentials on the configured endpoint", () =>
+    Effect.gen(function* () {
+      const resolved = yield* SessionRunnerModel.fromCatalogModel(
+        ModelV2.Info.make({
+          ...model({ type: "aisdk", package: "@ai-sdk/openai", url: "https://openai.example/v1" }),
+          request: { headers: {}, body: {} },
+        }),
+        Credential.OAuth.make({
+          type: "oauth",
+          methodID: Integration.MethodID.make("device"),
+          access: "oauth-token",
+          refresh: "refresh",
+          expires: Date.now() + 60_000,
+          metadata: { accountID: "acct_123" },
+        }),
+      )
+      const request = LLM.request({ model: resolved, prompt: "Hello" })
+      const headers = yield* resolved.route.auth.apply({
+        request,
+        method: "POST",
+        url: "https://openai.example/v1/responses",
+        body: "{}",
+        headers: Headers.empty,
+      })
+
+      expect(resolved.route.endpoint.baseURL).toBe("https://openai.example/v1")
+      expect(headers.authorization).toBe("Bearer oauth-token")
+      expect(headers["chatgpt-account-id"]).toBeUndefined()
+    }),
+  )
+
   it.effect("rejects catalog APIs without a native route", () =>
     Effect.gen(function* () {
       const failure = yield* SessionRunnerModel.fromCatalogModel(

packages/core/test/session-runner-recorded.test.ts

@@ -31,7 +31,8 @@ import { ToolOutputStore } from "@opencode-ai/core/tool-output-store"
 import { SessionTable } from "@opencode-ai/core/session/sql"
 import { SessionStore } from "@opencode-ai/core/session/store"
 import { Location } from "@opencode-ai/core/location"
-import { SystemContextRegistry } from "@opencode-ai/core/system-context/registry"
+import { SystemContextBuiltIns } from "@opencode-ai/core/system-context/builtins"
+import { InstructionContext } from "@opencode-ai/core/instruction-context"
 import { SystemContext } from "@opencode-ai/core/system-context"
 import { SkillGuidance } from "@opencode-ai/core/skill/guidance"
 import { ReferenceGuidance } from "@opencode-ai/core/reference/guidance"
@@ -72,7 +73,8 @@ const model = OpenAIChat.route
   })
   .model({ id: "gpt-4o-mini" })
 const models = SessionRunnerModel.layerWith(() => Effect.succeed(model))
-const systemContext = AppNodeBuilder.build(SystemContextRegistry.node)
+const systemContext = Layer.mock(SystemContextBuiltIns.Service, { load: () => Effect.succeed(SystemContext.empty) })
+const instructionContext = Layer.mock(InstructionContext.Service, { load: () => Effect.succeed(SystemContext.empty) })
 const skillGuidance = Layer.mock(SkillGuidance.Service, { load: () => Effect.succeed(SystemContext.empty) })
 const referenceGuidance = Layer.mock(ReferenceGuidance.Service, { load: () => Effect.succeed(SystemContext.empty) })
 const mcpGuidance = Layer.mock(McpGuidance.Service, { load: () => Effect.succeed(SystemContext.empty) })
@@ -81,7 +83,8 @@ const runnerLayer = AppNodeBuilder.build(SessionRunnerLLM.node, [
   [Snapshot.node, Snapshot.noopLayer],
   [LayerNodePlatform.llmClient, client],
   [SessionRunnerModel.node, models],
-  [SystemContextRegistry.node, systemContext],
+  [SystemContextBuiltIns.node, systemContext],
+  [InstructionContext.node, instructionContext],
   [Location.node, Location.boundNode({ directory: AbsolutePath.make("/project") })],
   [SkillGuidance.node, skillGuidance],
   [ReferenceGuidance.node, referenceGuidance],
@@ -116,7 +119,8 @@ const it = testEffect(
       AgentV2.node,
       ToolRegistry.node,
       SessionRunnerModel.node,
-      SystemContextRegistry.node,
+      SystemContextBuiltIns.node,
+      InstructionContext.node,
       SkillGuidance.node,
       ReferenceGuidance.node,
       Config.node,
@@ -129,7 +133,8 @@ const it = testEffect(
       [PermissionV2.node, permission],
       [ToolOutputStore.node, ToolOutputStore.nodeWithoutConfig],
       [SessionRunnerModel.node, models],
-      [SystemContextRegistry.node, systemContext],
+      [SystemContextBuiltIns.node, systemContext],
+      [InstructionContext.node, instructionContext],
       [Location.node, Location.boundNode({ directory: AbsolutePath.make("/project") })],
       [SkillGuidance.node, skillGuidance],
       [ReferenceGuidance.node, referenceGuidance],

packages/core/test/session-runner.test.ts

@@ -25,7 +25,6 @@ import { QuestionV2 } from "@opencode-ai/core/question"
 import { AbsolutePath } from "@opencode-ai/core/schema"
 import { SessionV2 } from "@opencode-ai/core/session"
 import { Snapshot } from "@opencode-ai/core/snapshot"
-import { ContextSnapshotDecodeError } from "@opencode-ai/core/session/error"
 import { SessionEvent } from "@opencode-ai/core/session/event"
 import { SessionCompaction } from "@opencode-ai/core/session/compaction"
 import { SessionTitle } from "@opencode-ai/core/session/title"
@@ -46,14 +45,16 @@ import { Config } from "@opencode-ai/core/config"
 import { ConfigCompaction } from "@opencode-ai/core/config/compaction"
 import { Tool } from "@opencode-ai/core/tool/tool"
 import {
-  SessionContextEpochTable,
+  SessionContextCheckpointTable,
   SessionInputTable,
   SessionMessageTable,
   SessionTable,
 } from "@opencode-ai/core/session/sql"
+import { SessionContextEntry } from "@opencode-ai/core/session/context-entry"
 import { SessionStore } from "@opencode-ai/core/session/store"
 import { SystemContext } from "@opencode-ai/core/system-context"
-import { SystemContextRegistry } from "@opencode-ai/core/system-context/registry"
+import { SystemContextBuiltIns } from "@opencode-ai/core/system-context/builtins"
+import { InstructionContext } from "@opencode-ai/core/instruction-context"
 import { SkillGuidance } from "@opencode-ai/core/skill/guidance"
 import { ReferenceGuidance } from "@opencode-ai/core/reference/guidance"
 import { McpGuidance } from "@opencode-ai/core/mcp/guidance"
@@ -169,35 +170,28 @@ let systemRemoved = false
 let systemUnavailable = false
 let systemLoadHook = Effect.void
 const skillBaselines = new Map<AgentV2.ID, string>()
-const systemContext = Layer.effectDiscard(
-  SystemContextRegistry.Service.pipe(
-    Effect.flatMap((registry) =>
-      registry.register({
-        key: systemContextKey,
-        load: Effect.sync(() =>
-          SystemContext.combine(
-            systemRemoved
-              ? []
-              : [
-                  SystemContext.make({
-                    key: systemContextKey,
-                    codec: Schema.toCodecJson(Schema.String),
-                    load: systemLoadHook.pipe(
-                      Effect.andThen(
-                        Effect.sync(() => (systemUnavailable ? SystemContext.unavailable : systemBaseline)),
-                      ),
-                    ),
-                    baseline: String,
-                    update: (_previous, current) => current,
-                    removed: () => "System context source removed: test/context",
-                  }),
-                ],
-          ),
-        ),
-      }),
+const systemContext = Layer.mock(SystemContextBuiltIns.Service, {
+  load: () =>
+    Effect.sync(() =>
+      SystemContext.combine(
+        systemRemoved
+          ? []
+          : [
+              SystemContext.make({
+                key: systemContextKey,
+                codec: Schema.toCodecJson(Schema.String),
+                load: systemLoadHook.pipe(
+                  Effect.andThen(Effect.sync(() => (systemUnavailable ? SystemContext.unavailable : systemBaseline))),
+                ),
+                baseline: String,
+                update: (_previous, current) => current,
+                removed: () => "System context source removed: test/context",
+              }),
+            ],
+      ),
     ),
-  ),
-).pipe(Layer.provideMerge(AppNodeBuilder.build(SystemContextRegistry.node)))
+})
+const instructionContext = Layer.mock(InstructionContext.Service, { load: () => Effect.succeed(SystemContext.empty) })
 const skillGuidance = Layer.mock(SkillGuidance.Service, {
   load: (agent) =>
     Effect.succeed(
@@ -236,7 +230,8 @@ const runnerLayer = AppNodeBuilder.build(SessionRunnerLLM.node, [
   [Snapshot.node, Snapshot.noopLayer],
   [LayerNodePlatform.llmClient, client],
   [SessionRunnerModel.node, models],
-  [SystemContextRegistry.node, systemContext],
+  [SystemContextBuiltIns.node, systemContext],
+  [InstructionContext.node, instructionContext],
   [Location.node, Location.boundNode({ directory: AbsolutePath.make("/project") })],
   [SkillGuidance.node, skillGuidance],
   [ReferenceGuidance.node, referenceGuidance],
@@ -274,7 +269,9 @@ const it = testEffect(
       ToolRegistry.toolsNode,
       echoNode,
       SessionRunnerModel.node,
-      SystemContextRegistry.node,
+      SystemContextBuiltIns.node,
+      InstructionContext.node,
+      SessionContextEntry.node,
       SkillGuidance.node,
       ReferenceGuidance.node,
       Config.node,
@@ -287,7 +284,8 @@ const it = testEffect(
       [LayerNodePlatform.llmClient, client],
       [PermissionV2.node, permission],
       [SessionRunnerModel.node, models],
-      [SystemContextRegistry.node, systemContext],
+      [SystemContextBuiltIns.node, systemContext],
+      [InstructionContext.node, instructionContext],
       [Location.node, Location.boundNode({ directory: AbsolutePath.make("/project") })],
       [SkillGuidance.node, skillGuidance],
       [ReferenceGuidance.node, referenceGuidance],
@@ -699,8 +697,8 @@ describe("SessionRunnerLLM", () => {
       expect(
         yield* db
           .select()
-          .from(SessionContextEpochTable)
-          .where(eq(SessionContextEpochTable.session_id, sessionID))
+          .from(SessionContextCheckpointTable)
+          .where(eq(SessionContextCheckpointTable.session_id, sessionID))
           .get(),
       ).toBeUndefined()
 
@@ -731,8 +729,8 @@ describe("SessionRunnerLLM", () => {
       expect(
         yield* db
           .select()
-          .from(SessionContextEpochTable)
-          .where(eq(SessionContextEpochTable.session_id, sessionID))
+          .from(SessionContextCheckpointTable)
+          .where(eq(SessionContextCheckpointTable.session_id, sessionID))
           .get(),
       ).toBeUndefined()
 
@@ -745,7 +743,36 @@ describe("SessionRunnerLLM", () => {
     }),
   )
 
-  it.effect("fails gracefully when a stored context snapshot cannot be decoded", () =>
+  it.effect("copies the context checkpoint to a fork", () =>
+    Effect.gen(function* () {
+      yield* setup
+      const session = yield* SessionV2.Service
+      const { db } = yield* Database.Service
+      yield* session.prompt({ sessionID, prompt: Prompt.make({ text: "First" }), resume: false })
+      response = []
+      yield* session.resume(sessionID)
+
+      const forked = yield* session.fork({ sessionID })
+
+      const parent = yield* db
+        .select()
+        .from(SessionContextCheckpointTable)
+        .where(eq(SessionContextCheckpointTable.session_id, sessionID))
+        .get()
+        .pipe(Effect.orDie)
+      expect(parent).toBeDefined()
+      expect(
+        yield* db
+          .select()
+          .from(SessionContextCheckpointTable)
+          .where(eq(SessionContextCheckpointTable.session_id, forked.id))
+          .get()
+          .pipe(Effect.orDie),
+      ).toEqual({ ...parent!, session_id: forked.id })
+    }),
+  )
+
+  it.effect("heals an undecodable stored applied record by re-announcing context", () =>
     Effect.gen(function* () {
       yield* setup
       const session = yield* SessionV2.Service
@@ -754,19 +781,28 @@ describe("SessionRunnerLLM", () => {
       response = []
       yield* session.resume(sessionID)
       yield* db
-        .update(SessionContextEpochTable)
+        .update(SessionContextCheckpointTable)
         .set({ snapshot: { invalid: { value: "bad" } } })
-        .where(eq(SessionContextEpochTable.session_id, sessionID))
+        .where(eq(SessionContextCheckpointTable.session_id, sessionID))
         .run()
         .pipe(Effect.orDie)
       yield* session.prompt({ sessionID, prompt: Prompt.make({ text: "Second" }), resume: false })
       requests.length = 0
 
-      const exit = yield* session.resume(sessionID).pipe(Effect.exit)
+      yield* session.resume(sessionID)
 
-      expect(Exit.isFailure(exit)).toBe(true)
-      if (Exit.isFailure(exit)) expect(Cause.squash(exit.cause)).toBeInstanceOf(ContextSnapshotDecodeError)
-      expect(requests).toHaveLength(0)
+      // Comparison state was lost, so every source re-announces as new.
+      expect(requests).toHaveLength(1)
+      expect(requests[0]?.system.map((part) => part.text)).toEqual([defaultSystem, "Initial context"])
+      expect(requests[0]?.messages.map((message) => message.role)).toEqual(["user", "system", "user"])
+      expect(requests[0]?.messages.at(1)?.content).toEqual([{ type: "text", text: "Initial context" }])
+      const healed = yield* db
+        .select({ snapshot: SessionContextCheckpointTable.snapshot })
+        .from(SessionContextCheckpointTable)
+        .where(eq(SessionContextCheckpointTable.session_id, sessionID))
+        .get()
+        .pipe(Effect.orDie)
+      expect(healed?.snapshot).toEqual({ "test/context": { value: "Initial context", removed: expect.any(String) } })
     }),
   )
 
@@ -787,8 +823,8 @@ describe("SessionRunnerLLM", () => {
         [defaultSystem, "Initial context"],
         [defaultSystem, "Initial context"],
       ])
-      expect(requests[1]?.messages.map((message) => message.role)).toEqual(["user", "user", "system"])
-      expect(requests[1]?.messages.at(-1)?.content).toEqual([{ type: "text", text: "Changed context" }])
+      expect(requests[1]?.messages.map((message) => message.role)).toEqual(["user", "system", "user"])
+      expect(requests[1]?.messages.at(1)?.content).toEqual([{ type: "text", text: "Changed context" }])
       expect(yield* session.messages({ sessionID })).toHaveLength(3)
       const { db } = yield* Database.Service
       expect(
@@ -1049,14 +1085,66 @@ describe("SessionRunnerLLM", () => {
       yield* session.prompt({ sessionID, prompt: Prompt.make({ text: "Second" }), resume: false })
       yield* session.resume(sessionID)
 
-      expect(requests[1]?.messages.map((message) => message.role)).toEqual(["user", "user", "system"])
-      expect(requests[1]?.messages.at(-1)?.content).toEqual([
+      expect(requests[1]?.messages.map((message) => message.role)).toEqual(["user", "system", "user"])
+      expect(requests[1]?.messages.at(1)?.content).toEqual([
         { type: "text", text: "System context source removed: test/context" },
       ])
       expect(yield* session.messages({ sessionID })).toHaveLength(3)
     }),
   )
 
+  it.effect("renders API context entries through the belief lifecycle", () =>
+    Effect.gen(function* () {
+      yield* setup
+      const session = yield* SessionV2.Service
+      const contextEntries = yield* SessionContextEntry.Service
+      yield* contextEntries.put({ sessionID, key: "deploy-target", value: "production" })
+      yield* session.prompt({ sessionID, prompt: Prompt.make({ text: "First" }), resume: false })
+
+      requests.length = 0
+      response = []
+      yield* session.resume(sessionID)
+
+      // String values render verbatim inside the tagged block at baseline.
+      expect(requests[0]?.system.map((part) => part.text)).toEqual([
+        defaultSystem,
+        ["Initial context", "", '<context key="deploy-target">', "production", "</context>"].join("\n"),
+      ])
+
+      // Non-string JSON pretty-prints; the change narrates as a System update.
+      yield* contextEntries.put({ sessionID, key: "deploy-target", value: { region: "us-east-1" } })
+      yield* session.prompt({ sessionID, prompt: Prompt.make({ text: "Second" }), resume: false })
+      yield* session.resume(sessionID)
+
+      expect(requests[1]?.messages.map((message) => message.role)).toEqual(["user", "system", "user"])
+      expect(requests[1]?.messages.at(1)?.content).toEqual([
+        {
+          type: "text",
+          text: [
+            'The context under "deploy-target" changed and supersedes the previous value:',
+            '<context key="deploy-target">',
+            "{",
+            '  "region": "us-east-1"',
+            "}",
+            "</context>",
+          ].join("\n"),
+        },
+      ])
+      expect(yield* contextEntries.list(sessionID)).toEqual([{ key: "deploy-target", value: { region: "us-east-1" } }])
+
+      // Deleting the row announces removal through the stored removal text.
+      yield* contextEntries.remove({ sessionID, key: "deploy-target" })
+      yield* session.prompt({ sessionID, prompt: Prompt.make({ text: "Third" }), resume: false })
+      yield* session.resume(sessionID)
+
+      expect(requests[2]?.messages.map((message) => message.role)).toEqual(["user", "system", "user", "system", "user"])
+      expect(requests[2]?.messages.at(-2)?.content).toEqual([
+        { type: "text", text: 'The context under "deploy-target" no longer applies. Disregard it.' },
+      ])
+      expect(yield* contextEntries.list(sessionID)).toEqual([])
+    }),
+  )
+
   it.effect("keeps the baseline and chronological System updates after a model switch", () =>
     Effect.gen(function* () {
       yield* setup
@@ -1085,15 +1173,15 @@ describe("SessionRunnerLLM", () => {
         [defaultSystem, "Initial context"],
         [defaultSystem, "Initial context"],
       ])
-      expect(requests[1]?.messages.map((message) => message.role)).toEqual(["user", "user", "system"])
+      expect(requests[1]?.messages.map((message) => message.role)).toEqual(["user", "system", "user"])
       expect(requests[2]?.messages.filter((message) => message.role === "system")).toHaveLength(2)
       expect((yield* session.context(sessionID)).map((message) => message.type)).toEqual([
-        "user",
         "user",
         "system",
+        "user",
         "model-switched",
-        "user",
         "system",
+        "user",
       ])
       yield* replaySessionProjection(sessionID)
       expect(yield* session.messages({ sessionID })).toHaveLength(6)
@@ -1361,7 +1449,7 @@ describe("SessionRunnerLLM", () => {
     }),
   )
 
-  it.effect("preserves effective System updates while compaction rebaseline is blocked", () =>
+  it.effect("rebaselines after compaction from the last-applied belief while unobservable", () =>
     Effect.gen(function* () {
       yield* setup
       const session = yield* SessionV2.Service
@@ -1393,8 +1481,9 @@ describe("SessionRunnerLLM", () => {
       yield* session.prompt({ sessionID, prompt: Prompt.make({ text: "Third" }), resume: false })
       yield* session.resume(sessionID)
 
-      expect(requests.at(-1)?.system.map((part) => part.text)).toEqual([defaultSystem, "Initial context"])
-      expect(systemTexts(requests.at(-1)!)).toContain("Changed context")
+      // The rebaseline proceeds while the source is unobservable, restating the model's belief.
+      expect(requests.at(-1)?.system.map((part) => part.text)).toEqual([defaultSystem, "Changed context"])
+      expect(systemTexts(requests.at(-1)!)).not.toContain("Changed context")
     }),
   )
 

packages/core/test/skill/guidance.test.ts

@@ -53,7 +53,7 @@ describe("SkillGuidance", () => {
         .load({ id: agent.id, info: agent })
         .pipe(Effect.flatMap(SystemContext.initialize))
 
-      expect(initialized.baseline).toBe(
+      expect(initialized.text).toBe(
         [
           "Skills provide specialized instructions and workflows for specific tasks.",
           "Use the skill tool to load a skill when a task matches its description.",
@@ -65,16 +65,82 @@ describe("SkillGuidance", () => {
           "</available_skills>",
         ].join("\n"),
       )
-      expect(initialized.baseline).not.toContain("manual")
+      expect(initialized.text).not.toContain("manual")
 
       skills = []
       expect(
         yield* guidance
           .load({ id: agent.id, info: agent })
-          .pipe(Effect.flatMap((context) => SystemContext.reconcile(context, initialized.snapshot))),
+          .pipe(Effect.flatMap((context) => SystemContext.reconcile(context, initialized.applied))),
       ).toMatchObject({
         _tag: "Updated",
-        text: expect.stringContaining("No skills are currently available."),
+        text: "The following skills are no longer available and must not be used: effect.",
+      })
+    }).pipe(Effect.provide(layer(() => skills)))
+  })
+
+  it.effect("announces added and removed skills as deltas without restating the list", () => {
+    const agent = AgentV2.Info.make(AgentV2.Info.empty(build))
+    const debugging = SkillV2.Info.make({
+      name: "debugging",
+      description: "Diagnose hard bugs",
+      location: AbsolutePath.make(path.resolve("/skills/debugging/SKILL.md")),
+      content: "Debugging guidance",
+    })
+    let skills = [effect]
+    return Effect.gen(function* () {
+      const guidance = yield* SkillGuidance.Service
+      const initialized = yield* guidance
+        .load({ id: agent.id, info: agent })
+        .pipe(Effect.flatMap(SystemContext.initialize))
+
+      skills = [effect, debugging]
+      const added = yield* guidance
+        .load({ id: agent.id, info: agent })
+        .pipe(Effect.flatMap((context) => SystemContext.reconcile(context, initialized.applied)))
+      expect(added).toMatchObject({
+        _tag: "Updated",
+        text: [
+          "New skills are available in addition to those previously listed:",
+          "  <skill>",
+          "    <name>debugging</name>",
+          "    <description>Diagnose hard bugs</description>",
+          "  </skill>",
+        ].join("\n"),
+      })
+
+      skills = [debugging]
+      const removed = yield* guidance
+        .load({ id: agent.id, info: agent })
+        .pipe(
+          Effect.flatMap((context) => SystemContext.reconcile(context, added._tag === "Updated" ? added.applied : {})),
+        )
+      expect(removed).toMatchObject({
+        _tag: "Updated",
+        text: "The following skills are no longer available and must not be used: effect.",
+      })
+    }).pipe(Effect.provide(layer(() => skills)))
+  })
+
+  it.effect("restates the full skill list when a description changes", () => {
+    const agent = AgentV2.Info.make(AgentV2.Info.empty(build))
+    let skills = [effect]
+    return Effect.gen(function* () {
+      const guidance = yield* SkillGuidance.Service
+      const initialized = yield* guidance
+        .load({ id: agent.id, info: agent })
+        .pipe(Effect.flatMap(SystemContext.initialize))
+
+      skills = [SkillV2.Info.make({ ...effect, description: "Build applications with Effect v4" })]
+      expect(
+        yield* guidance
+          .load({ id: agent.id, info: agent })
+          .pipe(Effect.flatMap((context) => SystemContext.reconcile(context, initialized.applied))),
+      ).toMatchObject({
+        _tag: "Updated",
+        text: expect.stringContaining(
+          "The available skills have changed. This list supersedes the previous available skills list.",
+        ),
       })
     }).pipe(Effect.provide(layer(() => skills)))
   })
@@ -89,8 +155,8 @@ describe("SkillGuidance", () => {
       expect(
         yield* guidance.load({ id: agent.id, info: agent }).pipe(Effect.flatMap(SystemContext.initialize)),
       ).toEqual({
-        baseline: "",
-        snapshot: {},
+        text: "",
+        applied: {},
       })
     }).pipe(Effect.provide(layer(() => [effect])))
   })
@@ -108,8 +174,8 @@ describe("SkillGuidance", () => {
       expect(
         yield* guidance.load({ id: agent.id, info: agent }).pipe(Effect.flatMap(SystemContext.initialize)),
       ).toEqual({
-        baseline: "",
-        snapshot: {},
+        text: "",
+        applied: {},
       })
     }).pipe(Effect.provide(layer(() => [effect])))
   })
@@ -125,7 +191,7 @@ describe("SkillGuidance", () => {
     return Effect.gen(function* () {
       const guidance = yield* SkillGuidance.Service
       expect(
-        (yield* guidance.load({ id: agent.id, info: agent }).pipe(Effect.flatMap(SystemContext.initialize))).baseline,
+        (yield* guidance.load({ id: agent.id, info: agent }).pipe(Effect.flatMap(SystemContext.initialize))).text,
       ).toContain("<name>effect</name>")
     }).pipe(Effect.provide(layer(() => [effect])))
   })
@@ -144,8 +210,8 @@ describe("SkillGuidance", () => {
       expect(
         yield* guidance.load({ id: agent.id, info: agent }).pipe(Effect.flatMap(SystemContext.initialize)),
       ).toEqual({
-        baseline: "",
-        snapshot: {},
+        text: "",
+        applied: {},
       })
     }).pipe(Effect.provide(layer(() => [effect])))
   })

packages/core/test/system-context/builtins.test.ts

@@ -9,7 +9,7 @@ import { Global } from "@opencode-ai/core/global"
 import { AbsolutePath } from "@opencode-ai/core/schema"
 import { SystemContext } from "@opencode-ai/core/system-context"
 import { SystemContextBuiltIns } from "@opencode-ai/core/system-context/builtins"
-import { SystemContextRegistry } from "@opencode-ai/core/system-context/registry"
+import { InstructionContext } from "@opencode-ai/core/instruction-context"
 import { location } from "../fixture/location"
 import { testEffect } from "../lib/effect"
 
@@ -27,7 +27,7 @@ const locationLayer = Layer.succeed(
     ),
   ),
 )
-const builtInsNode = LayerNode.group([SystemContextBuiltIns.node, SystemContextRegistry.node])
+const builtInsNode = LayerNode.group([SystemContextBuiltIns.node, InstructionContext.node])
 const it = testEffect(
   AppNodeBuilder.build(builtInsNode, [
     [Location.node, locationLayer],
@@ -58,10 +58,10 @@ describe("SystemContextBuiltIns", () => {
   it.effect("loads location-scoped environment and host-local date context", () =>
     Effect.gen(function* () {
       yield* TestClock.setTime(timestamp)
-      const context = yield* SystemContextRegistry.Service
+      const context = yield* SystemContextBuiltIns.Service
       const initialized = yield* SystemContext.initialize(yield* context.load())
 
-      expect(initialized.baseline).toBe(
+      expect(initialized.text).toBe(
         [
           "Here is some useful information about the environment you are running in:",
           "<env>",
@@ -80,11 +80,11 @@ describe("SystemContextBuiltIns", () => {
   it.effect("reconciles the date without repeating unchanged environment context", () =>
     Effect.gen(function* () {
       yield* TestClock.setTime(timestamp)
-      const context = yield* SystemContextRegistry.Service
+      const context = yield* SystemContextBuiltIns.Service
       const initialized = yield* SystemContext.initialize(yield* context.load())
 
       yield* TestClock.setTime(timestamp + 24 * 60 * 60 * 1000)
-      const refreshed = yield* SystemContext.reconcile(yield* context.load(), initialized.snapshot)
+      const refreshed = yield* SystemContext.reconcile(yield* context.load(), initialized.applied)
 
       expect(refreshed).toMatchObject({
         _tag: "Updated",
@@ -96,20 +96,24 @@ describe("SystemContextBuiltIns", () => {
   it.effect("does not update again within the same local calendar day", () =>
     Effect.gen(function* () {
       yield* TestClock.setTime(timestamp)
-      const context = yield* SystemContextRegistry.Service
+      const context = yield* SystemContextBuiltIns.Service
       const initialized = yield* SystemContext.initialize(yield* context.load())
 
       yield* TestClock.setTime(timestamp + 60 * 60 * 1000)
-      expect(yield* SystemContext.reconcile(yield* context.load(), initialized.snapshot)).toEqual({ _tag: "Unchanged" })
+      expect(yield* SystemContext.reconcile(yield* context.load(), initialized.applied)).toEqual({ _tag: "Unchanged" })
     }),
   )
 
   itWithInstructions.effect("composes ambient instructions after built-in context", () =>
     Effect.gen(function* () {
       yield* TestClock.setTime(timestamp)
-      const context = yield* SystemContextRegistry.Service
+      const builtIns = yield* SystemContextBuiltIns.Service
+      const instructions = yield* InstructionContext.Service
+      const context = {
+        load: () => Effect.all([builtIns.load(), instructions.load()]).pipe(Effect.map(SystemContext.combine)),
+      }
 
-      expect((yield* SystemContext.initialize(yield* context.load())).baseline).toBe(
+      expect((yield* SystemContext.initialize(yield* context.load())).text).toBe(
         [
           "Here is some useful information about the environment you are running in:",
           "<env>",

packages/core/test/system-context/index.test.ts

@@ -32,11 +32,11 @@ describe("SystemContext", () => {
         removed: () => "Date removed",
       })
 
-      expect((yield* SystemContext.initialize(context)).snapshot["core/date"].value).toBe("2026-06-03T12:00:00.000Z")
+      expect((yield* SystemContext.initialize(context)).applied["core/date"].value).toBe("2026-06-03T12:00:00.000Z")
     }),
   )
 
-  it.effect("loads once and initializes a baseline with a structured snapshot", () =>
+  it.effect("loads once and initializes a baseline with the applied values", () =>
     Effect.gen(function* () {
       let loads = 0
       const context = SystemContext.combine([
@@ -55,8 +55,8 @@ describe("SystemContext", () => {
       ])
 
       expect(yield* SystemContext.initialize(context)).toEqual({
-        baseline: "Today's date is 2026-06-03.\n\nDirectory: /repo",
-        snapshot: {
+        text: "Today's date is 2026-06-03.\n\nDirectory: /repo",
+        applied: {
           "core/date": { value: "2026-06-03", removed: "The date was removed." },
           "core/location": { value: "/repo" },
         },
@@ -84,7 +84,7 @@ describe("SystemContext", () => {
       expect(yield* SystemContext.reconcile(changed, previous)).toEqual({
         _tag: "Updated",
         text: "The date changed from 2026-06-03 to 2026-06-04.",
-        snapshot: {
+        applied: {
           "core/date": { value: "2026-06-04", removed: "The date was removed." },
           "core/location": { value: "/repo", removed: "Removed: /repo" },
         },
@@ -113,19 +113,17 @@ describe("SystemContext", () => {
       expect(yield* SystemContext.reconcile(context, {})).toEqual({
         _tag: "Updated",
         text: "Available skill: effect",
-        snapshot: { "core/skills": { value: "effect" } },
+        applied: { "core/skills": { value: "effect" } },
       })
     }),
   )
 
-  it.effect("retains admitted snapshots while a source is temporarily unavailable", () =>
+  it.effect("retains the belief while a source is temporarily unavailable", () =>
     Effect.gen(function* () {
       const previous = { "core/remote": { value: "instructions", removed: "Instructions removed" } }
       const context = stringContext({ key: "core/remote", value: SystemContext.unavailable })
 
       expect(yield* SystemContext.reconcile(context, previous)).toEqual({ _tag: "Unchanged" })
-      expect(yield* SystemContext.replace(context, previous)).toEqual({ _tag: "ReplacementBlocked" })
-      expect(yield* SystemContext.replace(context, {})).toMatchObject({ _tag: "ReplacementReady" })
     }),
   )
 
@@ -152,17 +150,29 @@ describe("SystemContext", () => {
       ).toEqual({
         _tag: "Updated",
         text: "Instructions removed; stop applying them.",
-        snapshot: {},
+        applied: {},
       })
     }),
   )
 
-  it.effect("requests replacement when a source without removal text disappears", () =>
+  it.effect("retains an unannounced removal silently", () =>
     Effect.gen(function* () {
+      expect(yield* SystemContext.reconcile(SystemContext.empty, { "core/date": { value: "2026-06-04" } })).toEqual({
+        _tag: "Unchanged",
+      })
+
+      // The retained belief survives alongside other updates.
       expect(
-        yield* SystemContext.reconcile(SystemContext.empty, { "core/date": { value: "2026-06-04" } }),
-      ).toMatchObject({
-        _tag: "ReplacementReady",
+        yield* SystemContext.reconcile(stringContext({ key: "core/skills", value: "effect" }), {
+          "core/date": { value: "2026-06-04" },
+        }),
+      ).toEqual({
+        _tag: "Updated",
+        text: "effect",
+        applied: {
+          "core/skills": { value: "effect" },
+          "core/date": { value: "2026-06-04" },
+        },
       })
     }),
   )
@@ -189,17 +199,48 @@ describe("SystemContext", () => {
     }),
   )
 
-  it.effect("requests replacement when a stored value no longer decodes", () =>
+  it.effect("re-announces the baseline when a stored value no longer decodes", () =>
     Effect.gen(function* () {
       expect(
         yield* SystemContext.reconcile(stringContext({ key: "core/date", value: "2026-06-04" }), {
           "core/date": { value: 42, removed: "Date removed" },
         }),
-      ).toMatchObject({ _tag: "ReplacementReady" })
+      ).toEqual({
+        _tag: "Updated",
+        text: "2026-06-04",
+        applied: { "core/date": { value: "2026-06-04" } },
+      })
     }),
   )
 
-  it.effect("replaces from one coherent source observation", () =>
+  it.effect("renders undecodable re-announcements alongside other updates", () =>
+    Effect.gen(function* () {
+      const context = SystemContext.combine([
+        stringContext({
+          key: "core/date",
+          value: "2026-06-04",
+          update: (before, current) => `${before} -> ${current}`,
+        }),
+        stringContext({ key: "core/location", value: "/repo" }),
+      ])
+
+      expect(
+        yield* SystemContext.reconcile(context, {
+          "core/date": { value: "2026-06-03" },
+          "core/location": { value: 42 },
+        }),
+      ).toEqual({
+        _tag: "Updated",
+        text: "2026-06-03 -> 2026-06-04\n\n/repo",
+        applied: {
+          "core/date": { value: "2026-06-04" },
+          "core/location": { value: "/repo" },
+        },
+      })
+    }),
+  )
+
+  it.effect("rebaselines from one coherent source observation", () =>
     Effect.gen(function* () {
       let loads = 0
       const context = SystemContext.make({
@@ -213,52 +254,83 @@ describe("SystemContext", () => {
         update: (_previous, current) => current,
       })
 
-      expect(yield* SystemContext.reconcile(context, { "core/date": { value: 42 } })).toMatchObject({
-        _tag: "ReplacementReady",
-        generation: { baseline: "2026-06-04" },
+      expect(yield* SystemContext.rebaseline(context, { "core/date": { value: "2026-06-03" } })).toEqual({
+        text: "2026-06-04",
+        applied: { "core/date": { value: "2026-06-04" } },
       })
       expect(loads).toBe(1)
     }),
   )
 
-  it.effect("does not render discarded updates while replacing", () =>
+  it.effect("rebaselines an unavailable source from the last-applied belief", () =>
     Effect.gen(function* () {
-      let updates = 0
       const context = SystemContext.combine([
+        stringContext({ key: "core/date", value: "2026-06-04" }),
         stringContext({
-          key: "core/date",
-          value: "2026-06-04",
-          update: () => {
-            updates++
-            return "updated"
-          },
+          key: "core/remote",
+          value: SystemContext.unavailable,
+          baseline: (value) => `Instructions: ${value}`,
         }),
-        stringContext({ key: "core/location", value: "/repo" }),
       ])
 
       expect(
-        yield* SystemContext.reconcile(context, {
-          "core/date": { value: "2026-06-03" },
-          "core/location": { value: 42 },
+        yield* SystemContext.rebaseline(context, {
+          "core/remote": { value: "contents", removed: "Instructions removed" },
         }),
-      ).toMatchObject({ _tag: "ReplacementReady" })
-      expect(updates).toBe(0)
+      ).toEqual({
+        text: "2026-06-04\n\nInstructions: contents",
+        applied: {
+          "core/date": { value: "2026-06-04" },
+          "core/remote": { value: "contents", removed: "Instructions removed" },
+        },
+      })
     }),
   )
 
-  it.effect("blocks an incompatible replacement while another admitted source is unavailable", () =>
+  it.effect("drops undecodable beliefs and removed sources at rebaseline", () =>
     Effect.gen(function* () {
-      const previous = {
-        "core/date": { value: 42, removed: "Date removed" },
-        "core/remote": { value: "instructions", removed: "Instructions removed" },
-      }
-      const context = SystemContext.combine([
-        stringContext({ key: "core/date", value: "2026-06-04" }),
-        stringContext({ key: "core/remote", value: SystemContext.unavailable }),
-      ])
+      const context = stringContext({ key: "core/remote", value: SystemContext.unavailable })
 
-      expect(yield* SystemContext.reconcile(context, previous)).toEqual({ _tag: "ReplacementBlocked" })
-      expect(yield* SystemContext.replace(context, previous)).toEqual({ _tag: "ReplacementBlocked" })
+      // Undecodable belief cannot be restated; removed source entries self-clean.
+      expect(
+        yield* SystemContext.rebaseline(context, {
+          "core/remote": { value: 42 },
+          "core/gone": { value: "gone" },
+        }),
+      ).toEqual({ text: "", applied: {} })
+    }),
+  )
+
+  it.effect("diffs list values by key with a changed comparator", () =>
+    Effect.sync(() => {
+      const previous = [
+        { name: "effect", description: "Build with Effect" },
+        { name: "debugging", description: "Diagnose bugs" },
+        { name: "retired", description: "Old" },
+      ]
+      const current = [
+        { name: "effect", description: "Build with Effect v4" },
+        { name: "debugging", description: "Diagnose bugs" },
+        { name: "writing", description: "Write prose" },
+      ]
+
+      expect(
+        SystemContext.diffByKey(
+          previous,
+          current,
+          (value) => value.name,
+          (before, after) => before.description !== after.description,
+        ),
+      ).toEqual({
+        added: [{ name: "writing", description: "Write prose" }],
+        removed: [{ name: "retired", description: "Old" }],
+        changed: [
+          {
+            previous: { name: "effect", description: "Build with Effect" },
+            current: { name: "effect", description: "Build with Effect v4" },
+          },
+        ],
+      })
     }),
   )
 
@@ -281,7 +353,7 @@ describe("SystemContext", () => {
             stringContext({ key: "core/date", value: "date" }),
             stringContext({ key: "core/location", value: "location" }),
           ]),
-        )).baseline,
+        )).text,
       ).toBe("date\n\nlocation")
     }),
   )
@@ -295,13 +367,13 @@ describe("SystemContext", () => {
     }),
   )
 
-  it.effect("requires namespaced durable snapshot keys", () =>
+  it.effect("requires namespaced applied keys", () =>
     Effect.sync(() => {
-      const decodeSnapshot = Schema.decodeUnknownSync(SystemContext.Snapshot)
+      const decodeApplied = Schema.decodeUnknownSync(SystemContext.Applied)
 
-      expect(Object.keys(decodeSnapshot({ "core/date": { value: "date" } }))).toEqual(["core/date"])
-      expect(() => decodeSnapshot({ date: { value: "date" } })).toThrow()
-      expect(() => decodeSnapshot({ "core/date": { value: "date", removed: "" } })).toThrow()
+      expect(Object.keys(decodeApplied({ "core/date": { value: "date" } }))).toEqual(["core/date"])
+      expect(() => decodeApplied({ date: { value: "date" } })).toThrow()
+      expect(() => decodeApplied({ "core/date": { value: "date", removed: "" } })).toThrow()
     }),
   )
 })

packages/core/test/system-context/registry.test.ts

@@ -1,114 +0,0 @@
-import { describe, expect } from "bun:test"
-import { Cause, Effect, Exit, Schema, Scope } from "effect"
-import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
-import { SystemContext } from "@opencode-ai/core/system-context"
-import { SystemContextRegistry } from "@opencode-ai/core/system-context/registry"
-import { testEffect } from "../lib/effect"
-
-const entry = (key: string, text: string, sourceKey = key) => ({
-  key: SystemContext.Key.make(key),
-  load: Effect.succeed(
-    SystemContext.make({
-      key: SystemContext.Key.make(sourceKey),
-      codec: Schema.toCodecJson(Schema.String),
-      load: Effect.succeed(text),
-      baseline: String,
-      update: (_previous, current) => current,
-    }),
-  ),
-})
-
-const it = testEffect(AppNodeBuilder.build(SystemContextRegistry.node))
-
-describe("SystemContextRegistry", () => {
-  it.effect("loads empty system context when there are no entries", () =>
-    Effect.gen(function* () {
-      const registry = yield* SystemContextRegistry.Service
-
-      expect(yield* SystemContext.initialize(yield* registry.load())).toEqual({ baseline: "", snapshot: {} })
-    }),
-  )
-
-  it.effect("loads scoped entries in stable key order", () =>
-    Effect.gen(function* () {
-      const registry = yield* SystemContextRegistry.Service
-      yield* registry.register(entry("test/second", "second"))
-      yield* registry.register(entry("test/first", "first"))
-
-      expect((yield* SystemContext.initialize(yield* registry.load())).baseline).toBe("first\n\nsecond")
-    }),
-  )
-
-  it.effect("re-evaluates entry producers on each load", () =>
-    Effect.gen(function* () {
-      const registry = yield* SystemContextRegistry.Service
-      let loads = 0
-      yield* registry.register({
-        key: SystemContext.Key.make("test/dynamic"),
-        load: Effect.sync(() => {
-          loads++
-          return SystemContext.empty
-        }),
-      })
-
-      yield* registry.load()
-      yield* registry.load()
-
-      expect(loads).toBe(2)
-    }),
-  )
-
-  it.effect("propagates entry producer failures", () =>
-    Effect.gen(function* () {
-      const registry = yield* SystemContextRegistry.Service
-      const failure = new Error("entry failed")
-      yield* registry.register({ key: SystemContext.Key.make("test/failure"), load: Effect.die(failure) })
-
-      const exit = yield* registry.load().pipe(Effect.exit)
-
-      expect(Exit.isFailure(exit)).toBe(true)
-      if (Exit.isFailure(exit)) expect(Cause.squash(exit.cause)).toBe(failure)
-    }),
-  )
-
-  it.effect("rejects duplicate source keys from separate entries", () =>
-    Effect.gen(function* () {
-      const registry = yield* SystemContextRegistry.Service
-      yield* registry.register(entry("test/first", "first", "test/duplicate"))
-      yield* registry.register(entry("test/second", "second", "test/duplicate"))
-
-      const exit = yield* registry.load().pipe(Effect.exit)
-
-      expect(Exit.isFailure(exit)).toBe(true)
-      if (Exit.isFailure(exit)) {
-        expect(Cause.squash(exit.cause)).toBeInstanceOf(SystemContext.DuplicateKeyError)
-        expect(Cause.squash(exit.cause)).toMatchObject({ key: SystemContext.Key.make("test/duplicate") })
-      }
-    }),
-  )
-
-  it.effect("rejects duplicate entry keys", () =>
-    Effect.gen(function* () {
-      const registry = yield* SystemContextRegistry.Service
-      yield* registry.register(entry("test/duplicate", "first"))
-
-      const exit = yield* registry.register(entry("test/duplicate", "second", "test/other")).pipe(Effect.exit)
-
-      expect(Exit.isFailure(exit)).toBe(true)
-      if (Exit.isFailure(exit)) expect(Cause.pretty(exit.cause)).toContain("Duplicate system context entry key")
-    }),
-  )
-
-  it.effect("removes an entry when its owning scope closes", () =>
-    Effect.gen(function* () {
-      const registry = yield* SystemContextRegistry.Service
-      const scope = yield* Scope.make()
-      yield* registry.register(entry("test/scoped", "scoped")).pipe(Scope.provide(scope))
-
-      expect((yield* SystemContext.initialize(yield* registry.load())).baseline).toBe("scoped")
-
-      yield* Scope.close(scope, Exit.void)
-      expect(yield* SystemContext.initialize(yield* registry.load())).toEqual({ baseline: "", snapshot: {} })
-    }),
-  )
-})

packages/llm/src/protocols/anthropic-messages.ts

@@ -148,9 +148,22 @@ const AnthropicToolChoice = Schema.Union([
   Schema.Struct({ type: Schema.tag("tool"), name: Schema.String }),
 ])
 
-const AnthropicThinking = Schema.Struct({
-  type: Schema.tag("enabled"),
-  budget_tokens: Schema.Number,
+const AnthropicThinking = Schema.Union([
+  Schema.Struct({
+    type: Schema.tag("enabled"),
+    budget_tokens: Schema.Number,
+  }),
+  Schema.Struct({
+    type: Schema.tag("adaptive"),
+    display: Schema.optional(Schema.Literals(["summarized", "omitted"])),
+  }),
+  Schema.Struct({
+    type: Schema.tag("disabled"),
+  }),
+])
+
+const AnthropicOutputConfig = Schema.Struct({
+  effort: Schema.optional(Schema.String),
 })
 
 const AnthropicBodyFields = {
@@ -166,6 +179,7 @@ const AnthropicBodyFields = {
   top_k: Schema.optional(Schema.Number),
   stop_sequences: optionalArray(Schema.String),
   thinking: Schema.optional(AnthropicThinking),
+  output_config: Schema.optional(AnthropicOutputConfig),
 }
 const AnthropicMessagesBody = Schema.Struct(AnthropicBodyFields)
 export type AnthropicMessagesBody = Schema.Schema.Type<typeof AnthropicMessagesBody>
@@ -492,7 +506,18 @@ const anthropicOptions = (request: LLMRequest) => request.providerOptions?.anthr
 
 const lowerThinking = Effect.fn("AnthropicMessages.lowerThinking")(function* (request: LLMRequest) {
   const thinking = anthropicOptions(request)?.thinking
-  if (!ProviderShared.isRecord(thinking) || thinking.type !== "enabled") return undefined
+  if (!ProviderShared.isRecord(thinking)) return undefined
+  if (thinking.type === "adaptive") {
+    const display =
+      thinking.display === "summarized"
+        ? ("summarized" as const)
+        : thinking.display === "omitted"
+          ? ("omitted" as const)
+          : undefined
+    return { type: "adaptive" as const, ...(display === undefined ? {} : { display }) }
+  }
+  if (thinking.type === "disabled") return { type: "disabled" as const }
+  if (thinking.type !== "enabled") return undefined
   const budget =
     typeof thinking.budgetTokens === "number"
       ? thinking.budgetTokens
@@ -503,6 +528,11 @@ const lowerThinking = Effect.fn("AnthropicMessages.lowerThinking")(function* (re
   return { type: "enabled" as const, budget_tokens: budget }
 })
 
+const outputConfig = (request: LLMRequest) => {
+  const effort = anthropicOptions(request)?.effort
+  return typeof effort === "string" ? { effort } : undefined
+}
+
 const fromRequest = Effect.fn("AnthropicMessages.fromRequest")(function* (request: LLMRequest) {
   const toolChoice = request.toolChoice ? yield* lowerToolChoice(request.toolChoice) : undefined
   const generation = request.generation
@@ -549,6 +579,7 @@ const fromRequest = Effect.fn("AnthropicMessages.fromRequest")(function* (reques
     top_k: generation?.topK,
     stop_sequences: generation?.stop,
     thinking: yield* lowerThinking(request),
+    output_config: outputConfig(request),
   }
 })
 

packages/llm/src/protocols/openai-chat.ts

@@ -168,8 +168,6 @@ interface ParserState {
   readonly lifecycle: Lifecycle.State
 }
 
-const invalid = ProviderShared.invalidRequest
-
 // =============================================================================
 // Request Lowering
 // =============================================================================
@@ -333,8 +331,6 @@ const lowerMessages = Effect.fn("OpenAIChat.lowerMessages")(function* (request:
 const lowerOptions = Effect.fn("OpenAIChat.lowerOptions")(function* (request: LLMRequest) {
   const store = OpenAIOptions.store(request)
   const reasoningEffort = OpenAIOptions.reasoningEffort(request)
-  if (reasoningEffort && !OpenAIOptions.isReasoningEffort(reasoningEffort))
-    return yield* invalid(`OpenAI Chat does not support reasoning effort ${reasoningEffort}`)
   return {
     ...(store !== undefined ? { store } : {}),
     ...(reasoningEffort ? { reasoning_effort: reasoningEffort } : {}),

packages/llm/src/protocols/openai-responses.ts

@@ -457,8 +457,6 @@ const lowerOptions = Effect.fn("OpenAIResponses.lowerOptions")(function* (reques
   const store = OpenAIOptions.store(request)
   const promptCacheKey = OpenAIOptions.promptCacheKey(request)
   const effort = OpenAIOptions.reasoningEffort(request)
-  if (effort && !OpenAIOptions.isReasoningEffort(effort))
-    return yield* invalid(`OpenAI Responses does not support reasoning effort ${effort}`)
   const summary = OpenAIOptions.reasoningSummary(request)
   const include = OpenAIOptions.include(request)
   const verbosity = OpenAIOptions.textVerbosity(request)

packages/llm/src/protocols/utils/openai-options.ts

@@ -1,11 +1,9 @@
 import { Schema } from "effect"
-import type { LLMRequest, ReasoningEffort, TextVerbosity as TextVerbosityValue } from "../../schema"
+import type { LLMRequest, TextVerbosity as TextVerbosityValue } from "../../schema"
 import { ReasoningEfforts, TextVerbosity } from "../../schema"
 
-export const OpenAIReasoningEfforts = ReasoningEfforts.filter(
-  (effort): effort is Exclude<ReasoningEffort, "max"> => effort !== "max",
-)
-export type OpenAIReasoningEffort = (typeof OpenAIReasoningEfforts)[number]
+export const OpenAIReasoningEfforts = ReasoningEfforts
+export type OpenAIReasoningEffort = string
 
 // Mirrors OpenAI's `ResponseIncludable` union from the official SDK. Keep this
 // in lockstep with `openai-node/src/resources/responses/responses.ts`.
@@ -23,22 +21,16 @@ export type OpenAIResponseIncludable = (typeof OpenAIResponseIncludables)[number
 export const OpenAIServiceTiers = ["auto", "default", "flex", "priority"] as const
 export type OpenAIServiceTier = (typeof OpenAIServiceTiers)[number]
 
-const REASONING_EFFORTS = new Set<string>(ReasoningEfforts)
-const OPENAI_REASONING_EFFORTS = new Set<string>(OpenAIReasoningEfforts)
 const TEXT_VERBOSITY = new Set<string>(["low", "medium", "high"])
 const INCLUDABLES = new Set<string>(OpenAIResponseIncludables)
 const SERVICE_TIERS = new Set<string>(OpenAIServiceTiers)
 
-export const OpenAIReasoningEffort = Schema.Literals(OpenAIReasoningEfforts)
+export const OpenAIReasoningEffort = Schema.String
 export const OpenAITextVerbosity = TextVerbosity
 export const OpenAIResponseIncludable = Schema.Literals(OpenAIResponseIncludables)
 export const OpenAIServiceTier = Schema.Literals(OpenAIServiceTiers)
 
-const isAnyReasoningEffort = (effort: unknown): effort is ReasoningEffort =>
-  typeof effort === "string" && REASONING_EFFORTS.has(effort)
-
-export const isReasoningEffort = (effort: unknown): effort is OpenAIReasoningEffort =>
-  typeof effort === "string" && OPENAI_REASONING_EFFORTS.has(effort)
+export const isReasoningEffort = (effort: unknown): effort is OpenAIReasoningEffort => typeof effort === "string"
 
 const isTextVerbosity = (value: unknown): value is TextVerbosityValue =>
   typeof value === "string" && TEXT_VERBOSITY.has(value)
@@ -50,9 +42,9 @@ export const store = (request: LLMRequest): boolean | undefined => {
   return typeof value === "boolean" ? value : undefined
 }
 
-export const reasoningEffort = (request: LLMRequest): ReasoningEffort | undefined => {
+export const reasoningEffort = (request: LLMRequest): string | undefined => {
   const value = options(request)?.reasoningEffort
-  return isAnyReasoningEffort(value) ? value : undefined
+  return typeof value === "string" ? value : undefined
 }
 
 export const reasoningSummary = (request: LLMRequest): "auto" | undefined =>

packages/llm/src/schema/ids.ts

@@ -27,7 +27,7 @@ export const ToolCallID = Schema.String
 export type ToolCallID = Schema.Schema.Type<typeof ToolCallID>
 
 export const ReasoningEfforts = ["none", "minimal", "low", "medium", "high", "xhigh", "max"] as const
-export const ReasoningEffort = Schema.Literals(ReasoningEfforts)
+export const ReasoningEffort = Schema.String
 export type ReasoningEffort = Schema.Schema.Type<typeof ReasoningEffort>
 
 export const TextVerbosity = Schema.Literals(["low", "medium", "high"])

packages/llm/test/provider/anthropic-messages.test.ts

@@ -57,6 +57,23 @@ describe("Anthropic Messages route", () => {
     }),
   )
 
+  it.effect("lowers adaptive thinking settings with effort", () =>
+    Effect.gen(function* () {
+      const prepared = yield* LLMClient.prepare<AnthropicMessages.AnthropicMessagesBody>(
+        LLM.updateRequest(request, {
+          providerOptions: {
+            anthropic: { thinking: { type: "adaptive", display: "summarized" }, effort: "low" },
+          },
+        }),
+      )
+
+      expect(prepared.body).toMatchObject({
+        thinking: { type: "adaptive", display: "summarized" },
+        output_config: { effort: "low" },
+      })
+    }),
+  )
+
   it.effect("lowers chronological system updates natively for Claude Opus 4.8 with cache hints", () =>
     Effect.gen(function* () {
       const prepared = yield* LLMClient.prepare<AnthropicMessages.AnthropicMessagesBody>(

packages/llm/test/provider/openai-chat.test.ts

@@ -98,12 +98,26 @@ describe("OpenAI Chat route", () => {
         LLM.request({
           model: OpenAI.configure({ baseURL: "https://api.openai.test/v1/", apiKey: "test" }).chat("gpt-4o-mini"),
           prompt: "think",
-          providerOptions: { openai: { reasoningEffort: "low" } },
+          providerOptions: { openai: { reasoningEffort: "max" } },
         }),
       )
 
       expect(prepared.body.store).toBe(false)
-      expect(prepared.body.reasoning_effort).toBe("low")
+      expect(prepared.body.reasoning_effort).toBe("max")
+    }),
+  )
+
+  it.effect("passes through custom OpenAI-compatible reasoning effort strings", () =>
+    Effect.gen(function* () {
+      const prepared = yield* LLMClient.prepare<OpenAIChat.OpenAIChatBody>(
+        LLM.request({
+          model,
+          prompt: "think",
+          providerOptions: { openai: { reasoningEffort: "experimental" } },
+        }),
+      )
+
+      expect(prepared.body.reasoning_effort).toBe("experimental")
     }),
   )
 

packages/llm/test/provider/openai-responses.test.ts

@@ -69,6 +69,16 @@ describe("OpenAI Responses route", () => {
     }),
   )
 
+  it.effect("passes through custom OpenAI reasoning effort strings", () =>
+    Effect.gen(function* () {
+      const prepared = yield* LLMClient.prepare<OpenAIResponses.OpenAIResponsesBody>(
+        LLM.updateRequest(request, { providerOptions: { openai: { reasoningEffort: "experimental" } } }),
+      )
+
+      expect(prepared.body.reasoning).toEqual({ effort: "experimental" })
+    }),
+  )
+
   it.effect("omits unsupported semantic service tiers", () =>
     Effect.gen(function* () {
       const prepared = yield* LLMClient.prepare(

packages/opencode/specs/simulation/simulation-phases.md

@@ -0,0 +1,170 @@
+# Simulation Implementation Phases
+
+Status: implementation plan for `specs/simulation/simulation.md`.
+
+The full simulation architecture is intentionally broad. This document breaks it into phases that can be implemented and reviewed incrementally.
+
+## Phase 1: Control Surface And Observability
+
+Goal: start the normal app in simulation mode and inspect/drive the TUI through an external WebSocket driver.
+
+This phase proves the core shape without swapping every foundational layer yet.
+
+Implementation checklist:
+
+- [x] Add `OPENCODE_SIMULATION=1` activation in V1/full-TUI startup.
+- [x] Add simulation trace service with in-memory append-only records.
+- [x] Add OpenTUI UI state extraction for screen, focus, elements, and generated actions.
+- [x] Add OpenTUI UI action execution for typing, keys, enter, arrows, focus, and click.
+- [x] Add reusable JSON-RPC WebSocket server on `127.0.0.1:40900+`.
+- [x] Expose `ui.state`, `ui.action`, `ui.render`.
+- [x] Expose `trace.list`, `trace.clear`, `trace.export`.
+- [x] Wire visible V1/full-TUI renderer path through the same action protocol.
+- [ ] Verify a local driver can inspect state and execute a real TUI input.
+
+Scope:
+
+- Add `OPENCODE_SIMULATION=1` activation.
+- Start a TUI-owned JSON-RPC WebSocket server on `127.0.0.1:40900+`.
+- Expose `ui.state`, `ui.action`, `ui.render`.
+- Use the old simulation action model: type text, press keys, press enter, arrows, focus, click.
+- Support fake OpenTUI renderer and visible renderer through the same action protocol.
+- Add in-memory append-only trace with `trace.list`, `trace.clear`, `trace.export`.
+- Record UI observations, generated actions, executed actions, errors, and render/stabilization events.
+
+Done when:
+
+- `OPENCODE_SIMULATION=1 bun run dev` starts the normal app.
+- A local driver can connect to the WebSocket.
+- The driver can inspect current screen/elements/actions.
+- The driver can execute real TUI inputs.
+- The trace shows observations and actions.
+
+Out of scope:
+
+- Backend layer replacement.
+- Model-based runner.
+- Generated plugin config.
+- Deterministic replay tests.
+
+## Phase 2: Foundational Simulation Layers
+
+Goal: make the app safe and controlled by swapping the lowest layers, not app logic.
+
+Scope:
+
+- Wire simulation replacements through `AppNodeBuilder.build(...)` and `AppNodeBuilderV1.build(...)`.
+- Create a real, empty anchor directory (`mkdtemp`) and `process.chdir` into it before any command resolves its working directory; skip creation when the runner already spawned the app inside an anchor.
+- Root the in-memory filesystem at `process.cwd()` (the anchor). No cwd monkey-patching: cwd, `$PWD`, and `path.resolve()` stay truthful.
+- Add snapshot loading from `OPENCODE_SIMULATION_STATE`: read the snapshot directory once at startup and seed the in-memory filesystem (snapshot `project/` paths joined onto the anchor root), config, env, and optional LLM/network state from it.
+- Route config/data/state/cache/temp paths into the simulated space using existing env seams (`OPENCODE_CONFIG_DIR`, `OPENCODE_TEST_HOME`, `OPENCODE_DB=:memory:`), set before `packages/core/src/global.ts` import-time path setup runs.
+- Deny host filesystem escapes loudly (paths outside the anchor root fail with typed simulation errors).
+- Assert the anchor directory on the host is still empty at the end of the run; anything written there means a code path bypassed the simulated filesystem.
+- Add simulated network registry and deny unknown external network by default.
+- Add scriptable LLM boundary.
+- Add simulated process registry:
+  - shell through `just-bash` against the simulated filesystem.
+  - minimal fake `git` support for discovery/status paths.
+  - deny unsupported process spawns.
+- Add simulation-gated backend control routes, proxied only through the frontend WebSocket.
+- Expose backend methods through the frontend server: filesystem seed/write, network register, LLM enqueue, backend snapshot.
+- Trace filesystem, network, LLM, process, and backend control activity.
+
+Done when:
+
+- Unknown network fails with a simulation error.
+- Host filesystem escape fails with a simulation error.
+- The anchor directory on the host is empty after a run.
+- The app boots from a snapshot directory via `OPENCODE_SIMULATION_STATE` and observes the seeded project files, config, and env through normal app paths.
+- A driver can seed a project filesystem.
+- A driver can enqueue an LLM script and submit a prompt through the TUI.
+- The real session/tool path consumes the scripted LLM behavior.
+- Shell commands use `just-bash`; unsupported process spawns fail.
+- Trace contains backend activity and snapshots.
+
+Out of scope:
+
+- Model-based generation.
+- Generated plugin config state.
+- Shrinking.
+
+## Phase 3: Generated Config And Model-Based Runner
+
+Goal: explore different app states using generated commands and plugin-provided config state.
+
+Scope:
+
+- Add generated simulation plugins as the primary config-state generation mechanism.
+- Support generated plugin domains for:
+  - agents and defaults.
+  - provider/model availability.
+  - tool definitions and scripted tool behavior.
+  - MCP-like capabilities or endpoints.
+  - permission policies.
+  - instructions/system-context-like inputs where supported.
+  - workspace/project adapters where supported.
+- Add runner commands to generate, enable, disable, and inspect generated plugin state.
+- Build a custom external model-based runner, not `fast-check` yet.
+- Runner command shape: precondition, execute, model update, postcondition.
+- Runner model tracks only high-level observational state: screen category, prompt availability, sessions, files, queued LLM scripts, generated plugins, backend status, idle expectation.
+- Generate valid command sequences from model state and current `ui.state.actions`.
+- Record seed, command distribution, precondition rejections, generated plugin/config domain coverage, UI action coverage, and backend event coverage.
+
+Done when:
+
+- A seeded runner can generate a short valid exploration.
+- The runner can generate plugin-provided config state without generating large arbitrary config files.
+- The app loads and observes generated plugin state through normal plugin/config paths.
+- The runner can type and submit prompts through the TUI using generated actions.
+- Basic properties run after commands: no crash, no unknown network, no host FS escape, coherent stabilized state.
+- Trace export includes enough state to replay the generated run later.
+
+Out of scope:
+
+- Shrinking.
+- Coverage-guided mutation corpus.
+- Differential testing.
+- CI randomized runs.
+
+## Phase 4: Replay, Promotion, And Campaigns
+
+Goal: turn exploratory simulation into durable tests and prepare for larger campaigns.
+
+Scope:
+
+- Add replay from exported trace.
+- Add deterministic replay test generation from successful or failing traces.
+- Add stronger trace schema validation.
+- Add property families beyond no-crash:
+  - durable prompt admission is not lost.
+  - no duplicated visible message IDs.
+  - no orphan tool results.
+  - queue/steer semantics hold at stabilization boundaries.
+  - interrupt/resume does not duplicate promoted inputs.
+- Add corpus storage for interesting traces.
+- Add simple coverage/novelty scoring over UI states, backend event types, tool outcomes, generated config domains, and errors.
+- Add long-running campaign mode outside normal CI.
+
+Done when:
+
+- A trace from Phase 3 can be replayed deterministically.
+- A trace can be promoted to a normal test fixture.
+- Campaign runs can collect interesting traces without committing randomized tests to CI.
+- Failures produce a compact reproduction command and trace export.
+
+Out of scope:
+
+- Full shrinking.
+- Deterministic scheduler/clock control.
+- Parallel campaigns.
+- Differential testing across app versions.
+
+## Later Work
+
+- Shrinking failed traces.
+- Coverage-guided mutation of structured traces.
+- `fast-check` integration if the custom runner becomes too limited.
+- Differential testing across versions, renderers, storage modes, or scheduler policies.
+- Deterministic clock/random/scheduler control.
+- Parallel isolated workers.
+- Model-generated properties with validity/soundness/coverage scoring.

packages/opencode/specs/simulation/simulation.md

@@ -0,0 +1,489 @@
+# Opencode Simulation Architecture
+
+Status: first milestone architecture draft.
+
+## Goal
+
+Build a simulation environment for exploring opencode through the real app, primarily through the TUI, while replacing only the lowest foundational layers needed to make runs controlled, observable, and safe.
+
+The first milestone is an interactive exploration and model-based testing environment. It should be enough to start opencode normally, put the app into generated states, drive real user-level TUI actions, observe what happened, and record an in-memory trace that can later be exported into deterministic replay tests.
+
+This is not intended to be a custom simulated app or a separate `simulate` command. The normal app should run, with simulation enabled by one required flag:
+
+```sh
+OPENCODE_SIMULATION=1 bun run dev
+```
+
+## Non-Goals
+
+- Do not reimplement the app.
+- Do not replace mid-level services like session processing, tool registry, provider orchestration, route trees, or TUI components unless a foundational seam proves impossible.
+- Do not build shrinking in the first milestone.
+- Do not make generated randomized runs part of CI yet.
+- Do not build differential testing in the first milestone.
+- Do not expose simulation controls when `OPENCODE_SIMULATION` is not set.
+
+## Design Principles
+
+- Run the real app through normal commands.
+- Drive the TUI using real user-level input: typing, keypresses, focus, click, and mouse actions.
+- Keep simulation code isolated under a simulation/testing area.
+- Touch production app code only at narrow activation points: builders, TUI startup, foundational layers, and simulation-gated backend routes.
+- Swap foundational layers, not app logic.
+- Make observations rich enough for humans and models.
+- Treat traces as first-class artifacts.
+- Use a lightweight model of expected high-level behavior, not a clone of opencode internals.
+- Generate valid commands from current observed state rather than blindly fuzzing impossible actions.
+
+## Activation
+
+`OPENCODE_SIMULATION=1` is the only required flag.
+
+Initial state is provided through an optional snapshot directory:
+
+```sh
+OPENCODE_SIMULATION=1 OPENCODE_SIMULATION_STATE=/path/to/snapshot bun run dev
+```
+
+Optional flags can be added later, but should stay minimal. Reasonable optional parameters later include renderer mode, trace output path, seed, or port override.
+
+All simulation parameters are environment variables, not CLI flags. This is a hard requirement: `packages/core/src/global.ts` computes and creates XDG paths at module import time, so anything that redirects paths must be in place before the first import. Environment variables set by the parent process (or read at the very top of startup) satisfy this; CLI flags parsed after imports do not.
+
+When enabled:
+
+- The app creates and changes into a real, empty anchor directory (see Filesystem).
+- The app reads the snapshot directory, if provided, and seeds all simulated state from it.
+- The app builds with simulation layer replacements.
+- The TUI process starts a loopback WebSocket control server.
+- Simulation-gated backend control routes become available only to the frontend/control path.
+- In-memory trace recording starts automatically.
+
+Path seams reuse existing environment variables where they already exist: `OPENCODE_CONFIG_DIR` for global config, `OPENCODE_TEST_HOME` for home, and `OPENCODE_DB=:memory:` for the database. Simulation mode should set these before foundational modules load rather than inventing parallel mechanisms.
+
+## Control Server
+
+The external control surface lives in the TUI/frontend process, not the backend API server.
+
+This is important because the frontend has direct access to the renderer, screen state, focus state, interactable elements, and user input APIs. The backend remains the normal backend, with only simulation-gated control routes used internally by the frontend when needed.
+
+Protocol:
+
+- JSON-RPC 2.0 over WebSocket.
+- Loopback only.
+- Start at `127.0.0.1:40900`.
+- If occupied, scan upward and report the actual URL.
+- External drivers connect only to this frontend WebSocket.
+
+The app should not send JSON-RPC requests back to the driver in the first milestone. The driver sends requests; the app responds and emits notifications/events as useful.
+
+Initial method groups:
+
+- `ui.state`: return screen, elements, focus, and generated possible actions.
+- `ui.action`: execute one real user-level action.
+- `ui.render`: force or wait for a render and return state.
+- `backend.filesystem.seed`: seed project files.
+- `backend.filesystem.write`: write one file.
+- `backend.network.register`: register a fake network response.
+- `backend.llm.enqueue`: queue scripted LLM behavior.
+- `backend.snapshot`: return backend simulation state.
+- `trace.list`: return trace records.
+- `trace.clear`: clear in-memory trace.
+- `trace.export`: export trace JSON for replay/test generation.
+- `run.stabilize`: wait for frontend/backend quiescence and return observations.
+
+## TUI Actions
+
+The old simulation branch had the right basic shape: observe OpenTUI renderables, derive executable actions, and execute those actions through OpenTUI input/mouse APIs.
+
+The first action vocabulary should stay close to that work:
+
+```ts
+type UIAction =
+  | { type: "typeText"; text: string }
+  | { type: "pressKey"; key: string; modifiers?: KeyModifiers }
+  | { type: "pressEnter" }
+  | { type: "pressArrow"; direction: "up" | "down" | "left" | "right" }
+  | { type: "focus"; target: number }
+  | { type: "click"; target: number; x: number; y: number }
+```
+
+`ui.state` should return:
+
+- Current screen text.
+- Focused renderable/editor state.
+- Interactable elements.
+- Generated actions valid for the current UI state.
+
+Elements should include stable-enough semantic data where available:
+
+- Renderable ID and numeric target.
+- Position and dimensions.
+- Focusable/clickable/editor flags.
+- Focused flag.
+- Text or label when available.
+- Role/capability when available.
+
+Both fake OpenTUI renderer and visible terminal renderer should share this protocol. The architecture should support both; the default can be decided later.
+
+## Backend Control
+
+The backend server should be exactly the normal backend server.
+
+Simulation-only backend routes may exist, but only when `OPENCODE_SIMULATION=1`. They are private implementation details for the frontend simulation server to proxy commands like filesystem seeding, LLM scripting, network registration, and snapshots.
+
+External drivers should not use backend simulation routes directly.
+
+## Foundational Layer Replacement
+
+Current `origin/dev` has the right seam: `AppNodeBuilder.build(...)` and `AppNodeBuilderV1.build(...)` accept replacements over `LayerNode`s. Simulation should use those seams instead of adding large alternate app assemblies.
+
+First milestone replacements:
+
+- Filesystem.
+- Network / HTTP client.
+- LLM boundary.
+- Process spawner.
+
+First milestone generated state surfaces:
+
+- Filesystem/project state.
+- Network responses.
+- LLM scripts.
+- Process registry behavior.
+- Plugin-generated config state.
+
+Likely later replacements:
+
+- Clock/random.
+- Database path/isolation.
+- Global paths/temp paths.
+
+The goal is to swap things at the bottom of the app. Everything above these foundational services should behave as production code.
+
+## Filesystem
+
+The filesystem simulation is in-memory, anchored at a real empty directory.
+
+On startup in simulation mode:
+
+1. Create a real, empty anchor directory with `mkdtemp` (for example `$TMPDIR/opencode-sim-XXXXXX`).
+2. `process.chdir(anchor)` before any command resolves its working directory.
+3. Use `process.cwd()` — now the anchor — as the root of the in-memory filesystem.
+4. Seed the in-memory filesystem from the snapshot directory, joining snapshot-relative paths onto the anchor root.
+
+The anchor directory on the host stays empty for the entire run. All file content lives only in the in-memory filesystem.
+
+Rationale for the real anchor:
+
+- `process.cwd()`, `$PWD`, and `path.resolve()` are all genuinely correct with zero patching. The previous simulation branch used a virtual root (`/opencode`) that existed nowhere on the host, which forced monkey-patching `process.cwd` and `$PWD` and left raw `fs` relative-path resolution silently disagreeing with the faked cwd.
+- The codebase reads `process.cwd()` at process edges (CLI entry points, TUI frontend, request-fallback in workspace routing) and converts it into an explicit `directory` value early; core never reads it directly. A truthful cwd at startup means every downstream consumer inherits the virtual root without touching those call sites.
+- Leak detection is free: the anchor must be empty at the end of the run. Any file that appears there means some code path bypassed the simulated filesystem. This is an assertable invariant.
+- Host filesystem bypasses read an empty directory instead of the developer's real project. Bypassed reads fail loudly instead of returning wrong-but-plausible data.
+
+Rationale for in-memory content:
+
+- The run is hermetic: no host writes, no cleanup dependencies, no cross-run contamination.
+- Snapshots load and reset quickly, which matters for model-based runs that reset state often.
+- The containment check (path must be inside the anchor root) doubles as the host-escape guard with a truthful boundary.
+
+The in-memory filesystem is still controlled and isolated:
+
+- Each run gets its own anchor root.
+- Project files, config, data, state, cache, and temp paths should resolve inside that root (via `OPENCODE_CONFIG_DIR`, `OPENCODE_TEST_HOME`, and `OPENCODE_DB=:memory:`).
+- Paths outside the anchor root fail loudly with a typed simulation error.
+- Trace should record seeded files and file diffs/observations needed for replay.
+
+The anchor may be created by the app itself at activation, or by an external runner that spawns the app with the anchor as its working directory. Both should work: the app creates and enters an anchor only when its current directory is not already a designated anchor.
+
+## Initial State Snapshot
+
+`OPENCODE_SIMULATION_STATE` points at a directory containing one complete initial state. On startup the app slurps this directory once and constructs all simulated state from it. The snapshot is never written back to; it is a pure input.
+
+Proposed layout:
+
+```text
+snapshot/
+  project/...          # workspace files, seeded into the in-memory FS under the anchor root
+  config/opencode.json # global config; the directory backs OPENCODE_CONFIG_DIR
+  env.json             # extra environment values to apply
+  llm/...              # scripted LLM behavior to pre-enqueue (optional)
+  network/...          # network response registrations (optional)
+```
+
+Rules:
+
+- Paths inside `project/` are snapshot-relative. The loader joins them onto the anchor root, so absolute virtual paths look like real host paths under the anchor.
+- Anything the config references (skills, instructions, reference paths) must exist inside `project/`. A snapshot that references missing files is invalid.
+- The snapshot directory format is the contract between external state generators and the app. Generators (such as the opencode-probe project) produce snapshot directories plus a derived expected model; the app consumes only the snapshot.
+- Seeding through the control server (`backend.filesystem.seed` and friends) remains available for incremental changes during a run; the snapshot covers initial state.
+
+## Configuration Via Generated Plugins
+
+Generated configuration is a core first-milestone feature.
+
+Much of opencode behavior is driven by config. The simulation runner needs to put the app into many different config-shaped states: different agents, tools, providers, MCP servers, permissions, modes, instructions, formatting settings, feature flags, and other config-dependent behavior.
+
+The runner should not primarily generate arbitrary config files. Instead, the simulation should express config-shaped state as generated plugins.
+
+Rationale:
+
+- Plugins are already a normal extension surface for opencode behavior.
+- Generated plugins can produce app states without making the simulation depend on config-file syntax and file layout details.
+- Plugin-generated state keeps setup closer to runtime behavior: the app reads config, loads plugins, and observes plugin-provided behavior through normal app paths.
+- Plugins are a better unit for model-based generation because they can be named, versioned, traced, reused, and minimized independently.
+
+The first implementation should support generated simulation plugins that can contribute or affect config-equivalent domains such as:
+
+- Agents and agent defaults.
+- Provider/model availability.
+- Tool definitions and tool behavior.
+- MCP-like capabilities or endpoints.
+- Permission defaults and policies.
+- Instructions/system-context-like inputs where supported.
+- Formatting/project behavior where supported.
+- Workspace/project adapters where supported.
+
+The simulation can still write the minimal bootstrap state needed for opencode to discover generated plugins, but the interesting generated state should live in plugin definitions rather than large generated `opencode.json` files.
+
+Trace should record:
+
+- Generated plugin IDs.
+- Plugin-provided config/state fragments.
+- Plugin hooks registered.
+- Any plugin load/config errors.
+- Which generated plugin state was active for each run.
+
+The model-based runner should include commands for generating and enabling plugin state. These commands should have normal preconditions and postconditions just like UI actions or backend setup commands.
+
+Example command families:
+
+- Generate a provider/model plugin.
+- Generate an agent configuration plugin.
+- Generate a tool plugin with scripted behavior.
+- Generate permission policy state.
+- Generate MCP-like tool/resource state.
+- Enable or disable a generated plugin for the next app run.
+
+This is the main mechanism for exploring app states driven by configuration.
+
+## Network
+
+Unknown external network should fail loudly by default.
+
+The simulation network should support explicit response registration:
+
+- JSON response.
+- Text response.
+- Bytes response later if needed.
+- Status-only response.
+- Handler-style response later if needed.
+
+Loopback traffic needed by the app/frontend/backend may be allowed explicitly.
+
+All network calls should be traceable:
+
+- Method.
+- URL.
+- Request headers/body where safe.
+- Matched simulation route.
+- Status.
+- Response summary.
+- Error if denied.
+
+## LLM
+
+The LLM boundary should be scriptable.
+
+The driver can enqueue scripts that describe model behavior:
+
+- Text chunks.
+- Thinking/reasoning chunks if relevant.
+- Tool calls.
+- Errors.
+- Finish reason.
+
+The real session and tool pipeline should consume this behavior through the normal app path. The simulation should not bypass `SessionPrompt`, `SessionProcessor`, or tool execution.
+
+Missing scripted LLM behavior should fail with a clear simulation error unless a default response is explicitly configured.
+
+## Process Spawning
+
+External process spawning should be denied by default.
+
+The first milestone should provide a simulated process registry. This should be inspired by the old branch:
+
+- Shell commands can run through `just-bash` against the simulated filesystem.
+- A small fake `git` command set can support project discovery/status paths needed by the app.
+- Unsupported process spawns fail loudly.
+
+This preserves the rule that simulation does not spawn arbitrary external programs while still allowing useful shell/tool flows.
+
+## Trace
+
+Trace recording is always on in simulation mode, in memory for the first milestone.
+
+Trace entries should be append-only JSON-compatible records. They do not need to be written to disk initially, but `trace.export` should return a structure suitable for later replay and test generation.
+
+Trace should include:
+
+- Run metadata: seed, app version, renderer mode, WebSocket URL.
+- Initial world setup.
+- UI observations.
+- Generated UI actions.
+- Executed UI actions.
+- Backend control requests.
+- Backend snapshots.
+- Network requests and matches/denials.
+- LLM scripts enqueued and consumed.
+- Tool calls and results.
+- Permission decisions.
+- Filesystem seed/write/diff summaries.
+- Generated plugin/config state and load results.
+- Stabilization boundaries.
+- Errors and crashes.
+- Model command execution and postcondition results.
+
+The trace is the bridge between exploratory simulation and deterministic tests.
+
+## Model-Based Runner
+
+The first runner is an external driver connecting to the frontend WebSocket.
+
+Use a custom runner for now, not `fast-check`. It should still follow the core shape used by property/model-based testing libraries:
+
+```ts
+interface Command<Model> {
+  readonly name: string
+  check(model: Model): boolean
+  run(model: Model, app: SimulationClient): Promise<void>
+}
+```
+
+Basic runner responsibilities:
+
+- Keep a lightweight model of high-level expected state.
+- Generate commands whose preconditions match the model and current app observations.
+- Execute commands through the WebSocket.
+- Update the model.
+- Check postconditions/invariants.
+- Record all steps in the trace.
+- Support seed/replay.
+- Track simple distribution stats.
+
+The model should track high-level, observational state only, such as:
+
+- Current screen/route category.
+- Whether prompt editor is available.
+- Known sessions.
+- Known files and expected file contents/diffs.
+- Queued LLM scripts.
+- Recent backend/session status.
+- Whether app is expected to be idle.
+
+The model must not track implementation internals like fibers, exact runner loop state, cache internals, or database implementation details.
+
+Initial command families:
+
+- Seed filesystem.
+- Generate and enable plugin config state.
+- Register network response.
+- Enqueue LLM script.
+- Observe UI state.
+- Execute one generated UI action.
+- Type prompt text.
+- Press enter.
+- Stabilize.
+- Assert no crash.
+- Assert visible response or file effect.
+- Export trace.
+
+## Generators
+
+The first milestone should include generation, but not shrinking.
+
+Generation should be model-based and state-aware:
+
+- Generate from currently valid `ui.state.actions`.
+- Generate backend setup commands from scenario/model state.
+- Generate plugin-provided config state.
+- Generate LLM scripts that match likely user prompts and tool flows.
+- Generate short command sequences using preconditions.
+- Use a seed so runs can be replayed.
+- Use simple weights to avoid degenerate action selection.
+
+The generator should not attempt to produce arbitrary full app states upfront. It should build state by executing commands through the real app and observing the result.
+
+Important stats to record:
+
+- Seed.
+- Command counts.
+- Action type distribution.
+- Generated plugin/config domain distribution.
+- Rejected command/precondition counts.
+- UI element/action coverage.
+- Backend event type coverage where available.
+- Errors and stabilization failures.
+
+## Properties
+
+First milestone properties should be simple and high-signal:
+
+- App does not crash.
+- Backend does not crash.
+- Unknown network is denied.
+- Host filesystem escape is denied.
+- Prompt submission can reach a scripted LLM response.
+- Stabilization eventually reaches a coherent idle state for the demo flow.
+- File effects from scripted tool behavior are observable in the simulated filesystem.
+- Trace contains enough information to replay the run.
+
+More advanced model/refinement, metamorphic, and differential properties are future work.
+
+## First Demo Flow
+
+The first major demo should show this system as a real environment for exploring the app in controlled states:
+
+1. Start opencode normally with `OPENCODE_SIMULATION=1`.
+2. TUI starts and exposes the simulation WebSocket on `127.0.0.1:40900+`.
+3. External runner connects.
+4. Runner provides a snapshot directory (or seeds the in-memory project filesystem through the control server).
+5. Runner generates and enables plugin-provided config state.
+6. Runner queues a scripted LLM response.
+7. Runner observes `ui.state` and generated actions.
+8. Runner drives real TUI input to type and submit a prompt.
+9. App processes the prompt through the real backend/session/tool path.
+10. Scripted LLM response appears or executes a file-affecting tool flow.
+11. Runner stabilizes the app.
+12. Runner inspects trace, backend snapshot, UI state, generated plugin state, and filesystem state.
+13. Runner exports a deterministic replay trace.
+
+## Done-When Checklist
+
+- `OPENCODE_SIMULATION=1` starts the normal app with simulation wiring.
+- Simulation code is isolated under a dedicated simulation/testing area.
+- App changes outside simulation are limited to activation hooks, builder replacements, TUI startup, and gated backend routes.
+- TUI exposes JSON-RPC WebSocket on `127.0.0.1:40900+`.
+- Driver can call `ui.state`.
+- Driver can execute generated UI actions.
+- Fake and visible renderer paths use the same action protocol.
+- Driver can seed filesystem state.
+- Driver can generate and enable plugin-provided config state.
+- Driver can register network responses and observe denied unknown network.
+- Driver can enqueue LLM scripts.
+- External process spawning is denied by default, with shell via `just-bash` and minimal fake process registry support.
+- Driver can run a basic model-based generated command sequence.
+- In-memory trace records observations/actions/backend interactions.
+- Driver can list, clear, and export trace.
+- Demo flow succeeds end-to-end.
+
+## Future Directions
+
+- Shrinking failed traces.
+- Promote minimized traces into normal committed tests.
+- Coverage-guided corpus and structured trace mutation.
+- Richer semantic UI grounding for model-driven exploration.
+- LLM-generated property proposals with validity/soundness checks.
+- Differential testing across app versions, renderers, or storage modes.
+- Deterministic scheduler/clock/random control.
+- Parallel campaigns with isolated workers.
+- File-backed trace persistence and replay CLI.

packages/opencode/src/cli/cmd/attach.ts

@@ -43,32 +43,8 @@ export const AttachCommand = cmd({
         alias: ["u"],
         type: "string",
         describe: "basic auth username (defaults to OPENCODE_SERVER_USERNAME or 'opencode')",
-      })
-      .option("mini", {
-        type: "boolean",
-        describe: "start the minimal interactive interface",
-        default: false,
-      })
-      .option("replay", {
-        type: "boolean",
-        hidden: true,
-      })
-      .option("no-replay", {
-        type: "boolean",
-        describe: "disable mini session history replay on resume and after resize",
-      })
-      .option("replay-limit", {
-        type: "number",
-        describe: "cap visible mini replay to the newest N messages",
       }),
   handler: async (args) => {
-    if (args.replay === true) {
-      UI.error("--replay is not supported; replay is enabled by default")
-      process.exitCode = 1
-      return
-    }
-    const noReplay = args.replay === false || args.noReplay === true
-
     const directory = (() => {
       if (!args.dir) return undefined
       try {
@@ -80,32 +56,6 @@ export const AttachCommand = cmd({
       }
     })()
 
-    if (args.mini) {
-      const { runMini } = await import("./run")
-      await runMini({
-        attach: args.url,
-        directory,
-        password: args.password,
-        username: args.username,
-        continue: args.continue,
-        session: args.session,
-        fork: args.fork,
-        replay: noReplay ? false : undefined,
-        replayLimit: args.replayLimit,
-      })
-      return
-    }
-
-    const unsupported = [
-      ["--no-replay", noReplay],
-      ["--replay-limit", args.replayLimit !== undefined],
-    ].find((entry) => entry[1])?.[0]
-    if (unsupported) {
-      UI.error(`${unsupported} requires --mini`)
-      process.exitCode = 1
-      return
-    }
-
     const { TuiConfig } = await import("@/config/tui")
     if (args.fork && !args.continue && !args.session) {
       UI.error("--fork requires --continue or --session")

packages/opencode/src/cli/cmd/mini.ts

@@ -0,0 +1,172 @@
+import type { Argv } from "yargs"
+import { cmd } from "./cmd"
+import { UI } from "@/cli/ui"
+import { resolveThreadDirectory } from "./tui"
+
+type ReplayArgs = {
+  replay?: boolean
+  noReplay?: boolean
+}
+
+type MiniArgs = ReplayArgs & {
+  continue?: boolean
+  session?: string
+  fork?: boolean
+  replayLimit?: number
+}
+
+type MiniLocalArgs = MiniArgs & {
+  project?: string
+  model?: string
+  agent?: string
+  prompt?: string
+  demo?: boolean
+}
+
+type MiniAttachArgs = MiniArgs & {
+  url: string
+  dir?: string
+  password?: string
+  username?: string
+}
+
+function replay(args: ReplayArgs) {
+  if (args.replay === true) {
+    UI.error("--replay is not supported; replay is enabled by default")
+    process.exitCode = 1
+    return "invalid" as const
+  }
+  return args.replay === false || args.noReplay === true ? false : undefined
+}
+
+function miniOptions<T>(yargs: Argv<T>) {
+  return yargs
+    .option("continue", {
+      alias: ["c"],
+      describe: "continue the last session",
+      type: "boolean",
+    })
+    .option("session", {
+      alias: ["s"],
+      describe: "session id to continue",
+      type: "string",
+    })
+    .option("fork", {
+      type: "boolean",
+      describe: "fork the session when continuing (use with --continue or --session)",
+    })
+    .option("replay", {
+      type: "boolean",
+      hidden: true,
+    })
+    .option("no-replay", {
+      type: "boolean",
+      describe: "disable session history replay on resume and after resize",
+    })
+    .option("replay-limit", {
+      type: "number",
+      describe: "cap visible replay to the newest N messages",
+    })
+}
+
+/** @internal Exported for CLI parser tests. */
+export const MiniLocalCommand = cmd<{}, MiniLocalArgs>({
+  command: "$0 [project]",
+  describe: "start the minimal interactive interface",
+  builder: (yargs) =>
+    miniOptions(
+      yargs
+        .positional("project", {
+          type: "string",
+          describe: "path to start opencode in",
+        })
+        .option("model", {
+          type: "string",
+          alias: ["m"],
+          describe: "model to use in the format of provider/model",
+        })
+        .option("agent", {
+          type: "string",
+          describe: "agent to use",
+        })
+        .option("prompt", {
+          type: "string",
+          describe: "prompt to use",
+        })
+        .option("demo", {
+          type: "boolean",
+          hidden: true,
+        }),
+    ),
+  handler: async (args) => {
+    const shouldReplay = replay(args)
+    if (shouldReplay === "invalid") return
+
+    const { runMini } = await import("./run")
+    await runMini({
+      directory: resolveThreadDirectory(args.project),
+      continue: args.continue,
+      session: args.session,
+      fork: args.fork,
+      model: args.model,
+      agent: args.agent,
+      prompt: args.prompt,
+      replay: shouldReplay,
+      replayLimit: args.replayLimit,
+      demo: args.demo,
+    })
+  },
+})
+
+/** @internal Exported for CLI parser tests. */
+export const MiniAttachCommand = cmd<{}, MiniAttachArgs>({
+  command: "attach <url>",
+  describe: "attach to a running opencode server with the minimal interface",
+  builder: (yargs) =>
+    miniOptions(
+      yargs
+        .positional("url", {
+          type: "string",
+          describe: "http://localhost:4096",
+          demandOption: true,
+        })
+        .option("dir", {
+          type: "string",
+          describe: "directory on the remote server",
+        })
+        .option("password", {
+          alias: ["p"],
+          type: "string",
+          describe: "basic auth password (defaults to OPENCODE_SERVER_PASSWORD)",
+        })
+        .option("username", {
+          alias: ["u"],
+          type: "string",
+          describe: "basic auth username (defaults to OPENCODE_SERVER_USERNAME or 'opencode')",
+        }),
+    ),
+  handler: async (args) => {
+    const shouldReplay = replay(args)
+    if (shouldReplay === "invalid") return
+
+    const { runMini } = await import("./run")
+    await runMini({
+      attach: args.url,
+      directory: args.dir,
+      password: args.password,
+      username: args.username,
+      continue: args.continue,
+      session: args.session,
+      fork: args.fork,
+      replay: shouldReplay,
+      replayLimit: args.replayLimit,
+    })
+  },
+})
+
+export const MiniCommand = cmd({
+  command: "mini",
+  describe: "start the minimal interactive interface",
+  builder: (yargs) => yargs.command(MiniLocalCommand).command(MiniAttachCommand).demandCommand(),
+  handler: async () => {},
+})

packages/opencode/src/cli/cmd/run.ts

@@ -1,13 +1,13 @@
 import type { PermissionV1 } from "@opencode-ai/core/v1/permission"
 import { FSUtil } from "@opencode-ai/core/fs-util"
-// CLI entry point for `opencode run` and `opencode --mini`.
+// CLI entry point for `opencode run` and `opencode mini`.
 //
 // Handles three modes:
 //   1. Non-interactive (default): sends a single prompt, streams events to
 //      stdout, and exits when the session goes idle.
-//   2. Interactive local (`opencode --mini`): boots the split-footer direct mode
+//   2. Interactive local (`opencode mini`): boots the split-footer direct mode
 //      with an in-process server (no external HTTP).
-//   3. Interactive attach (`opencode --mini --attach`): connects to a running
+//   3. Interactive attach (`opencode mini attach`): connects to a running
 //      opencode server and runs interactive mode against it.
 //
 // Also supports `--command` for slash-command execution, `--format json` for
@@ -25,6 +25,8 @@ import { Filesystem } from "@/util/filesystem"
 import { createOpencodeClient, type OpencodeClient, type ToolPart } from "@opencode-ai/sdk/v2"
 import { FormatError, FormatUnknownError } from "../error"
 import { INTERACTIVE_INPUT_ERROR, resolveInteractiveStdin } from "./run/runtime.stdin"
+import { isImageAttachment, isPdfAttachment } from "@/util/media"
+import { loadRunAgents } from "./run/catalog.shared"
 
 type ModelInput = Parameters<OpencodeClient["session"]["prompt"]>[0]["model"]
 
@@ -49,6 +51,14 @@ function resolveRunInput(value?: string, piped?: string): string | undefined {
   return value + "\n" + piped
 }
 
+function isBinaryContent(bytes: Uint8Array) {
+  if (bytes.length === 0) return false
+  if (bytes.includes(0)) return true
+  return (
+    bytes.reduce((count, byte) => count + Number(byte < 9 || (byte > 13 && byte < 32)), 0) / bytes.length > 0.3
+  )
+}
+
 type FilePart = {
   type: "file"
   url: string
@@ -68,6 +78,7 @@ type SessionInfo = {
   id: string
   title?: string
   directory?: string
+  current?: boolean
 }
 
 function inline(info: Inline) {
@@ -158,10 +169,6 @@ export const RunCommand = effectCmd({
         describe: "fork the session before continuing (requires --continue or --session)",
         type: "boolean",
       })
-      .option("share", {
-        type: "boolean",
-        describe: "share the session",
-      })
       .option("model", {
         type: "string",
         alias: ["m"],
@@ -217,11 +224,6 @@ export const RunCommand = effectCmd({
         type: "boolean",
         describe: "show thinking blocks",
       })
-      .option("mini", {
-        type: "boolean",
-        hidden: true,
-        default: false,
-      })
       .option("replay", {
         type: "boolean",
         default: true,
@@ -270,7 +272,7 @@ export const RunCommand = effectCmd({
     const localInstance = yield* InstanceRef
     yield* Effect.promise(async () => {
       const rawMessage = [...args.message, ...(args["--"] || [])].join(" ")
-      const interactive = args.mini
+      const interactive = (args as typeof args & { mini?: boolean }).mini === true
       const auto = args.auto || args.yolo || args["dangerously-skip-permissions"]
       const thinking = interactive ? (args.thinking ?? true) : (args.thinking ?? false)
       const die = (message: string): never => {
@@ -290,23 +292,23 @@ export const RunCommand = effectCmd({
         .join(" ")
 
       if (interactive && args.command) {
-        die("--mini cannot be used with --command")
+        die("opencode mini cannot be used with --command")
       }
 
       if (interactive && args._?.[0] !== "mini") {
-        die("--mini must be used without the run subcommand")
+        die("opencode mini must be run with the mini command")
       }
 
       if (args.demo && !interactive) {
-        die("--demo requires --mini")
+        die("--demo requires opencode mini")
       }
 
       if (interactive && args.format === "json") {
-        die("--mini cannot be used with --format json")
+        die("opencode mini cannot be used with --format json")
       }
 
       if (args["replay-limit"] !== undefined && !interactive) {
-        die("--replay-limit requires --mini")
+        die("--replay-limit requires opencode mini")
       }
 
       if (
@@ -317,7 +319,7 @@ export const RunCommand = effectCmd({
       }
 
       if (interactive && !process.stdout.isTTY) {
-        die("--mini requires a TTY stdout")
+        die("opencode mini requires a TTY stdout")
       }
 
       if (interactive) {
@@ -355,6 +357,12 @@ export const RunCommand = effectCmd({
       }
 
       const files: FilePart[] = []
+      const fileInputs: Array<{
+        filePath: string
+        resolvedPath: string
+        stat: ReturnType<typeof Filesystem.stat>
+        isDirectory: boolean
+      }> = []
       if (args.file) {
         const list = Array.isArray(args.file) ? args.file : [args.file]
 
@@ -371,45 +379,7 @@ export const RunCommand = effectCmd({
             UI.error(`Cannot attach local directory without a shared filesystem: ${filePath}`)
             process.exit(1)
           }
-
-          const content = await (async () => {
-            if (!args.attach) return
-            const handle = await open(resolvedPath, "r")
-            try {
-              const opened = await handle.stat()
-              if (!opened.isFile() || Number(opened.size) > ATTACH_FILE_MAX_BYTES) {
-                UI.error(`Cannot attach local file larger than 10 MiB or a special file: ${filePath}`)
-                process.exit(1)
-              }
-              if (opened.size === 0) return Buffer.alloc(0)
-              const buffer = Buffer.alloc(Number(opened.size))
-              let offset = 0
-              while (offset < buffer.length) {
-                const read = await handle.read(buffer, offset, buffer.length - offset, offset)
-                if (read.bytesRead === 0) break
-                offset += read.bytesRead
-              }
-              return buffer.subarray(0, offset)
-            } finally {
-              await handle.close()
-            }
-          })()
-          const detected = FSUtil.mimeType(resolvedPath)
-          const text = content?.toString("utf8")
-          const mime = !args.attach
-            ? isDirectory
-              ? "application/x-directory"
-              : "text/plain"
-            : content && text !== undefined && Buffer.from(text, "utf8").equals(content)
-              ? "text/plain"
-              : detected
-
-          files.push({
-            type: "file",
-            url: content ? `data:${mime};base64,${content.toString("base64")}` : pathToFileURL(resolvedPath).href,
-            filename: path.basename(resolvedPath),
-            mime,
-          })
+          fileInputs.push({ filePath, resolvedPath, stat, isDirectory })
         }
       }
 
@@ -446,6 +416,53 @@ export const RunCommand = effectCmd({
               pattern: "*",
             },
           ]
+      const currentPrompt = !interactive && !args.command && fileInputs.every((file) => !file.isDirectory)
+
+      const inlineFiles = interactive || currentPrompt
+      for (const file of fileInputs) {
+        const content = await (async () => {
+          if (file.isDirectory || !inlineFiles) return
+          if (!file.stat?.isFile() || file.stat.size > ATTACH_FILE_MAX_BYTES) {
+            UI.error(`Cannot attach local file larger than 10 MiB or a special file: ${file.filePath}`)
+            process.exit(1)
+          }
+          const handle = await open(file.resolvedPath, "r")
+          try {
+            const opened = await handle.stat()
+            if (!opened.isFile() || Number(opened.size) > ATTACH_FILE_MAX_BYTES) {
+              UI.error(`Cannot attach local file larger than 10 MiB or a special file: ${file.filePath}`)
+              process.exit(1)
+            }
+            if (opened.size === 0) return Buffer.alloc(0)
+            const buffer = Buffer.alloc(Number(opened.size))
+            let offset = 0
+            while (offset < buffer.length) {
+              const read = await handle.read(buffer, offset, buffer.length - offset, offset)
+              if (read.bytesRead === 0) break
+              offset += read.bytesRead
+            }
+            return buffer.subarray(0, offset)
+          } finally {
+            await handle.close()
+          }
+        })()
+        const detected = FSUtil.mimeType(file.resolvedPath)
+        const text = content?.toString("utf8")
+        const mime = file.isDirectory
+          ? "application/x-directory"
+          : isImageAttachment(detected) || isPdfAttachment(detected)
+            ? detected
+            : content && !isBinaryContent(content) && text !== undefined && Buffer.from(text, "utf8").equals(content)
+              ? "text/plain"
+              : detected
+
+        files.push({
+          type: "file",
+          url: content ? `data:${mime};base64,${content.toString("base64")}` : pathToFileURL(file.resolvedPath).href,
+          filename: path.basename(file.resolvedPath),
+          mime,
+        })
+      }
 
       function title() {
         if (args.title === undefined) return
@@ -453,58 +470,122 @@ export const RunCommand = effectCmd({
         return message.slice(0, 50) + (message.length > 50 ? "..." : "")
       }
 
-      async function session(sdk: OpencodeClient): Promise<SessionInfo | undefined> {
-        if (args.session) {
-          const current = await sdk.session
-            .get({
-              sessionID: args.session,
-            })
-            .catch(() => undefined)
+      async function currentSession(sdk: OpencodeClient, sessionID: string): Promise<SessionInfo | undefined> {
+        const listed = await sdk.v2.session
+          .list({
+            directory: await current(sdk),
+            limit: 50,
+            order: "desc",
+          })
+          .then((result) => result.data?.data.find((item) => item.id === sessionID))
+          .catch(() => undefined)
+        const selected =
+          listed ??
+          (await sdk.v2.session
+            .get({ sessionID })
+            .then((result) => result.data?.data)
+            .catch(() => undefined))
+        const legacy =
+          selected ??
+          (await sdk.session
+            .get({ sessionID })
+            .then((result) => result.data)
+            .catch(() => undefined))
+        const transcript = await transcriptKind(sdk, legacy?.id ?? sessionID)
+        if (!legacy && transcript === "empty") {
+          return
+        }
+        if (interactive && transcript === "legacy") {
+          throw new Error("Mini cannot resume a legacy Session transcript")
+        }
 
-          if (!current?.data) {
-            UI.error("Session not found")
-            process.exit(1)
-          }
-
-          if (args.fork) {
-            const forked = await sdk.session.fork({
-              sessionID: args.session,
-            })
-            const id = forked.data?.id
-            if (!id) {
-              return
-            }
-
-            return {
-              id,
-              title: forked.data?.title ?? current.data.title,
-              directory: forked.data?.directory ?? current.data.directory,
-            }
-          }
+        return {
+          id: legacy?.id ?? sessionID,
+          title: legacy?.title,
+          directory: legacy ? ("location" in legacy ? legacy.location.directory : legacy.directory) : await current(sdk),
+          current: transcript !== "legacy",
+        }
+      }
 
+      async function forkSession(sdk: OpencodeClient, session: SessionInfo): Promise<SessionInfo | undefined> {
+        if (session.current !== false) {
+          const forked = await sdk.v2.session.fork(
+            { sessionID: session.id, messageID: undefined },
+            { throwOnError: true },
+          )
+          await waitForFork(sdk, session.id, forked.data.data.id)
           return {
-            id: current.data.id,
-            title: current.data.title,
-            directory: current.data.directory,
+            id: forked.data.data.id,
+            title: forked.data.data.title,
+            directory: forked.data.data.location.directory,
+            current: true,
           }
         }
 
-        const base = args.continue ? (await sdk.session.list()).data?.find((item) => !item.parentID) : undefined
+        const forked = await sdk.session.fork({
+          sessionID: session.id,
+        })
+        const id = forked.data?.id
+        if (!id) {
+          return
+        }
 
-        if (base && args.fork) {
-          const forked = await sdk.session.fork({
-            sessionID: base.id,
-          })
-          const id = forked.data?.id
-          if (!id) {
+        return {
+          id,
+          title: forked.data?.title ?? session.title,
+          directory: forked.data?.directory ?? session.directory,
+          current: false,
+        }
+      }
+
+      async function waitForFork(sdk: OpencodeClient, parentID: string, sessionID: string) {
+        const parentHasMessages = await sdk.v2.session
+          .messages({ sessionID: parentID, limit: 1 })
+          .then((result) => (result.data?.data.length ?? 0) > 0)
+          .catch(() => false)
+        if (!parentHasMessages) {
+          return
+        }
+
+        const deadline = Date.now() + 3000
+        while (Date.now() < deadline) {
+          const forkedHasMessages = await sdk.v2.session
+            .messages({ sessionID, limit: 1 })
+            .then((result) => (result.data?.data.length ?? 0) > 0)
+            .catch(() => false)
+          if (forkedHasMessages) {
             return
           }
 
-          return {
-            id,
-            title: forked.data?.title ?? base.title,
-            directory: forked.data?.directory ?? base.directory,
+          await Bun.sleep(25)
+        }
+      }
+
+      async function session(sdk: OpencodeClient): Promise<SessionInfo | undefined> {
+        if (args.session) {
+          const current = await currentSession(sdk, args.session)
+          if (!current) {
+            UI.error("Session not found")
+            process.exit(1)
           }
+          if (!interactive && !currentPrompt && current.current !== false) {
+            throw new Error("This operation is not available for a current Session transcript")
+          }
+
+          if (args.fork) {
+            return forkSession(sdk, current)
+          }
+
+          return current
+        }
+
+        const base = args.continue ? await currentRootSession(sdk) : undefined
+        if (base && !interactive && !currentPrompt && base.current !== false) {
+          throw new Error("This operation is not available for a current Session transcript")
+        }
+
+        if (base && args.fork) {
+          return forkSession(sdk, base)
         }
 
         if (base) {
@@ -512,6 +593,23 @@ export const RunCommand = effectCmd({
             id: base.id,
             title: base.title,
             directory: base.directory,
+            current: "current" in base ? base.current : false,
+          }
+        }
+
+        if (interactive || currentPrompt) {
+          const name = title()
+          const result = await sdk.v2.session.create({
+            location: { directory: await current(sdk) },
+          })
+          const created = result.data?.data
+          if (!created) return
+          if (name) await sdk.v2.session.rename({ sessionID: created.id, title: name })
+          return {
+            id: created.id,
+            title: name ?? created.title,
+            directory: created.location.directory,
+            current: true,
           }
         }
 
@@ -529,30 +627,45 @@ export const RunCommand = effectCmd({
           id,
           title: result.data?.title ?? name,
           directory: result.data?.directory,
+          current: false,
         }
       }
 
-      async function share(sdk: OpencodeClient, sessionID: string) {
-        const cfg = await sdk.config.get()
-        if (!cfg.data) return
-        if (cfg.data.share !== "auto" && !flags.autoShare && !args.share) return
-        const res = await sdk.session.share({ sessionID }).catch((error) => {
-          if (error instanceof Error && error.message.includes("disabled")) {
-            UI.println(UI.Style.TEXT_DANGER_BOLD + "!  " + error.message)
-          }
-          return { error }
+      async function currentRootSession(sdk: OpencodeClient): Promise<SessionInfo | undefined> {
+        const response = await sdk.v2.session.list({
+          directory: await current(sdk),
+          limit: 50,
+          order: "desc",
         })
-        if (!res.error && "data" in res && res.data?.share?.url) {
-          UI.println(UI.Style.TEXT_INFO_BOLD + "~  " + res.data.share.url)
+        const root = (response.data?.data ?? [])
+          .filter((session) => !session.parentID)
+          .toSorted((a, b) => b.time.updated - a.time.updated)[0]
+        if (!root) return
+        return currentSession(sdk, root.id)
+      }
+
+      async function transcriptKind(sdk: OpencodeClient, sessionID: string) {
+        const current = await sdk.v2.session.messages({ sessionID, limit: 1 }).then((result) => (result.data?.data.length ?? 0) > 0)
+        // Ordinary prompt flows assume a transcript with current messages is
+        // current-owned; only legacy-only modes (--command, directory
+        // attachments) still probe legacy history for mixed transcripts.
+        if (current && (interactive || currentPrompt)) return "current" as const
+
+        const legacy = await sdk.session.messages({ sessionID, limit: 1 }).then((result) => (result.data?.length ?? 0) > 0)
+        if (current) {
+          if (legacy) throw new Error("Session contains mixed legacy and current transcripts")
+          return "current" as const
         }
+        if (legacy) return "legacy" as const
+        return "empty" as const
       }
 
       async function createFreshSession(
         sdk: OpencodeClient,
         input: { agent: string | undefined; model: ModelInput | undefined; variant: string | undefined },
       ): Promise<SessionInfo> {
-        const result = await sdk.session.create({
-          title: args.title !== undefined && args.title !== "" ? args.title : undefined,
+        const name = args.title !== undefined && args.title !== "" ? args.title : undefined
+        const result = await sdk.v2.session.create({
           agent: input.agent,
           model: input.model
             ? {
@@ -561,17 +674,18 @@ export const RunCommand = effectCmd({
                 variant: input.variant,
               }
             : undefined,
-          permission: [...rules],
+          location: { directory: await current(sdk) },
         })
-        const id = result.data?.id
+        const created = result.data?.data
+        const id = created?.id
         if (!id) {
           throw new Error("Failed to create session")
         }
+        if (name) await sdk.v2.session.rename({ sessionID: id, title: name })
 
-        void share(sdk, id).catch(() => {})
         return {
           id,
-          title: result.data?.title,
+          title: name ?? created.title,
         }
       }
 
@@ -580,8 +694,8 @@ export const RunCommand = effectCmd({
           return directory ?? root
         }
 
-        const next = await sdk.path
-          .get()
+        const next = await sdk.v2.location
+          .get(undefined, { throwOnError: true })
           .then((x) => x.data?.directory)
           .catch(() => undefined)
         if (next) {
@@ -622,10 +736,7 @@ export const RunCommand = effectCmd({
         if (!args.agent) return undefined
         const name = args.agent
 
-        const modes = await sdk.app
-          .agents(undefined, { throwOnError: true })
-          .then((x) => x.data ?? [])
-          .catch(() => undefined)
+        const modes = await loadRunAgents(sdk, await current(sdk)).catch(() => undefined)
 
         if (!modes) {
           UI.println(
@@ -636,7 +747,7 @@ export const RunCommand = effectCmd({
           return undefined
         }
 
-        const agent = modes.find((a) => a.name === name)
+        const agent = modes.find((item) => item.name === name)
         if (!agent) {
           UI.println(
             UI.Style.TEXT_WARNING_BOLD + "!",
@@ -823,9 +934,33 @@ export const RunCommand = effectCmd({
         // Validate agent if specified
         const agent = await pickAgent(client)
 
-        await share(client, sessionID)
-
         if (!interactive) {
+          if (currentPrompt && sess.current !== false) {
+            const model = pick(args.model)
+            const { runNonInteractivePrompt } = await import("./run/noninteractive")
+            try {
+              await runNonInteractivePrompt({
+                client,
+                sessionID,
+                message,
+                files,
+                agent,
+                model,
+                variant: args.variant,
+                thinking,
+                format: args.format === "json" ? "json" : "default",
+                dangerouslySkipPermissions: args["dangerously-skip-permissions"],
+                renderTool: tool,
+                renderToolError: toolError,
+              })
+            } catch (error) {
+              const output = error instanceof Error ? { type: "unknown", message: error.message } : error
+              if (!emit("error", { error: output })) UI.error(formatRunError(error))
+              process.exitCode = 1
+            }
+            return
+          }
+
           const events = await client.event.subscribe()
           const completed = loop(client, events).catch((e) => {
             console.error(e)
@@ -880,7 +1015,7 @@ export const RunCommand = effectCmd({
             directory: cwd,
             sessionID,
             sessionTitle: sess.title,
-            resume: Boolean(args.session || args.continue) && !args.fork,
+            resume: Boolean(args.session || args.continue),
             replay,
             replayLimit: args["replay-limit"],
             agent,
@@ -917,7 +1052,6 @@ export const RunCommand = effectCmd({
             fetch: fetchFn,
             resolveAgent: localAgent,
             session,
-            share,
             createSession: createFreshSession,
             agent: args.agent,
             model,
@@ -984,7 +1118,6 @@ export async function runMini(input: MiniCommandInput) {
     continue: input.continue,
     session: input.session,
     fork: input.fork,
-    share: undefined,
     model: input.model,
     agent: input.agent,
     format: "default",
@@ -1007,5 +1140,5 @@ export async function runMini(input: MiniCommandInput) {
     "dangerously-skip-permissions": false,
     dangerouslySkipPermissions: false,
     demo: input.demo ?? false,
-  })
+  } as Parameters<NonNullable<typeof RunCommand.handler>>[0] & { mini: boolean })
 }

packages/opencode/src/cli/cmd/run/catalog.shared.ts

@@ -0,0 +1,114 @@
+import type { OpencodeClient } from "@opencode-ai/sdk/v2"
+import type { RunAgent, RunCommand, RunProvider, RunReference } from "./types"
+
+type CurrentAgent = NonNullable<Awaited<ReturnType<OpencodeClient["v2"]["agent"]["list"]>>["data"]>["data"][number]
+type CurrentCommand = NonNullable<Awaited<ReturnType<OpencodeClient["v2"]["command"]["list"]>>["data"]>["data"][number]
+type CurrentSkill = NonNullable<Awaited<ReturnType<OpencodeClient["v2"]["skill"]["list"]>>["data"]>["data"][number]
+type CurrentProvider = NonNullable<Awaited<ReturnType<OpencodeClient["v2"]["provider"]["list"]>>["data"]>["data"][number]
+type CurrentModel = NonNullable<Awaited<ReturnType<OpencodeClient["v2"]["model"]["list"]>>["data"]>["data"][number]
+
+function location(directory: string) {
+  return {
+    location: {
+      directory,
+    },
+  }
+}
+
+function defaultCost(model: CurrentModel) {
+  const picked = model.cost.find((cost) => cost.tier === undefined) ?? model.cost[0]
+  if (!picked) {
+    return undefined
+  }
+
+  return {
+    ...picked,
+    input: model.cost.every((cost) => cost.input === 0) ? 0 : picked.input,
+  }
+}
+
+export function runAgent(input: CurrentAgent): RunAgent {
+  return {
+    name: input.id,
+    description: input.description,
+    mode: input.mode,
+    hidden: input.hidden,
+  }
+}
+
+export function runCommand(input: CurrentCommand): RunCommand {
+  return {
+    name: input.name,
+    description: input.description,
+  }
+}
+
+export function runSkill(input: CurrentSkill): RunCommand {
+  return {
+    name: input.name,
+    description: input.description,
+    source: "skill",
+  }
+}
+
+export function runProviders(providers: CurrentProvider[], models: CurrentModel[]): RunProvider[] {
+  const grouped = new Map<string, RunProvider>()
+
+  for (const provider of providers) {
+    grouped.set(provider.id, {
+      id: provider.id,
+      name: provider.name,
+      models: {},
+    })
+  }
+
+  for (const model of models) {
+    const provider = grouped.get(model.providerID) ?? {
+      id: model.providerID,
+      name: model.providerID,
+      models: {},
+    }
+    provider.models[model.id] = {
+      id: model.id,
+      providerID: model.providerID,
+      name: model.name,
+      capabilities: model.capabilities,
+      cost: defaultCost(model),
+      limit: model.limit,
+      status: model.status,
+      variants: Object.fromEntries(model.variants.map((variant) => [variant.id, {}])),
+    }
+    grouped.set(provider.id, provider)
+  }
+
+  return [...grouped.values()]
+}
+
+export async function loadRunAgents(sdk: OpencodeClient, directory: string): Promise<RunAgent[]> {
+  const result = await sdk.v2.agent.list(location(directory), { throwOnError: true })
+  return (result.data?.data ?? []).map(runAgent)
+}
+
+export async function loadRunCommands(sdk: OpencodeClient, directory: string): Promise<RunCommand[]> {
+  const [commands, skills] = await Promise.all([
+    sdk.v2.command.list(location(directory), { throwOnError: true }),
+    sdk.v2.skill.list(location(directory), { throwOnError: true }),
+  ])
+  return [
+    ...(commands.data?.data ?? []).map(runCommand),
+    ...(skills.data?.data ?? []).filter((skill) => skill.slash !== false).map(runSkill),
+  ]
+}
+
+export async function loadRunReferences(sdk: OpencodeClient, directory: string): Promise<RunReference[]> {
+  const result = await sdk.v2.reference.list(location(directory), { throwOnError: true })
+  return (result.data?.data ?? []).filter((reference) => !reference.hidden)
+}
+
+export async function loadRunProviders(sdk: OpencodeClient, directory: string): Promise<RunProvider[]> {
+  const [providers, models] = await Promise.all([
+    sdk.v2.provider.list(location(directory), { throwOnError: true }),
+    sdk.v2.model.list(location(directory), { throwOnError: true }),
+  ])
+  return runProviders(providers.data?.data ?? [], models.data?.data ?? [])
+}

packages/opencode/src/cli/cmd/run/footer.permission.tsx

@@ -141,7 +141,9 @@ export function RunPermissionBody(props: {
   const info = createMemo(() => permissionInfo(props.request))
   const ft = createMemo(() => toolFiletype(info().file))
   const narrow = createMemo(() => footerWidthPolicy(dims().width).dialog.narrow)
-  const opts = createMemo(() => permissionOptions(state().stage))
+  const opts = createMemo(() =>
+    permissionOptions(state().stage).filter((option) => option !== "always" || props.request.always.length > 0),
+  )
   const busy = createMemo(() => state().submitting)
   const title = createMemo(() => {
     if (state().stage === "always") {
@@ -165,7 +167,7 @@ export function RunPermissionBody(props: {
   })
 
   const shift = (dir: -1 | 1) => {
-    setState((prev) => permissionShift(prev, dir))
+    setState((prev) => permissionShift(prev, dir, opts()))
   }
 
   const submit = async (next: PermissionReply) => {

packages/opencode/src/cli/cmd/run/footer.prompt.tsx

@@ -1,7 +1,7 @@
 // Prompt composer and its state machine for direct interactive mode.
 //
 // createPromptState() wires keymap command layers, history navigation, and
-// `@` autocomplete for files, subagents, and MCP resources.
+// `@` autocomplete for files, subagents, and project references.
 // It produces a PromptState that RunPromptBody renders as a slim single-line
 // composer while the footer view renders any active menus below it.
 /** @jsxImportSource @opentui/solid */
@@ -27,7 +27,7 @@ import { OPENCODE_BASE_MODE, useBindings } from "@opencode-ai/tui/keymap"
 import { realignEditorPromptParts, resolveEditorSlashValue } from "./prompt.editor"
 import { FOOTER_MENU_ROWS, createFooterMenuState, type RunFooterMenuItem } from "./footer.menu"
 import type { RunFooterTheme } from "./theme"
-import type { FooterState, RunAgent, RunCommand, RunPrompt, RunPromptPart, RunResource, RunTuiConfig } from "./types"
+import type { FooterState, RunAgent, RunCommand, RunPrompt, RunPromptPart, RunReference, RunTuiConfig } from "./types"
 
 const AUTOCOMPLETE_ROWS = FOOTER_MENU_ROWS
 const AUTOCOMPLETE_BOTTOM_ROWS = 1
@@ -59,7 +59,7 @@ type PromptInput = {
   directory: string
   findFiles: (query: string) => Promise<string[]>
   agents: Accessor<RunAgent[]>
-  resources: Accessor<RunResource[]>
+  references: Accessor<RunReference[]>
   commands: Accessor<RunCommand[] | undefined>
   tuiConfig: RunTuiConfig
   state: Accessor<FooterState>
@@ -333,21 +333,20 @@ export function createPromptState(input: PromptInput): PromptState {
         },
       }))
   })
-  const resources = createMemo<Auto[]>(() => {
-    return input.resources().map((item) => ({
+  const references = createMemo<Auto[]>(() => {
+    return input.references().map((item) => ({
       kind: "mention",
-      display: Locale.truncateMiddle(`@${item.name} (${item.uri})`, width()),
+      display: Locale.truncateMiddle("@" + item.name, width()),
       value: item.name,
-      description: item.description,
+      description: item.description ?? (item.source.type === "git" ? item.source.repository : item.source.path),
       part: {
         type: "file",
-        mime: item.mimeType ?? "text/plain",
+        mime: "application/x-directory",
         filename: item.name,
-        url: item.uri,
+        url: pathToFileURL(item.path).href,
         source: {
-          type: "resource",
-          clientName: item.client,
-          uri: item.uri,
+          type: "file",
+          path: item.name,
           text: {
             start: 0,
             end: 0,
@@ -402,7 +401,7 @@ export function createPromptState(input: PromptInput): PromptState {
     },
     { initialValue: [] as Auto[] },
   )
-  const mentionOptions = createMemo(() => [...agents(), ...files(), ...resources()])
+  const mentionOptions = createMemo(() => [...agents(), ...files(), ...references()])
   const skillCommands = createMemo(() => (input.commands() ?? []).filter((item) => item.source === "skill"))
   const hasSkillsCommand = createMemo(() =>
     (input.commands() ?? []).some((item) => item.source !== "skill" && item.name === "skills"),
@@ -462,7 +461,7 @@ export function createPromptState(input: PromptInput): PromptState {
       return [
         ...fuzzysort.go(next, agents(), { keys: ["value", "display", "description"] }).map((item) => item.obj),
         ...files(),
-        ...fuzzysort.go(next, resources(), { keys: ["value", "display", "description"] }).map((item) => item.obj),
+        ...fuzzysort.go(next, references(), { keys: ["value", "display", "description"] }).map((item) => item.obj),
       ]
     }
 

packages/opencode/src/cli/cmd/run/footer.subagent.tsx

@@ -53,6 +53,9 @@ export function RunFooterSubagentBody(props: {
   diffStyle?: RunDiffStyle
   onCycle: (dir: -1 | 1) => void
   onClose: () => void
+  // Formatted interrupt shortcut from the registered keymap binding; the
+  // command itself is dispatched through the keymap in footer.view.
+  interrupt?: () => string | undefined
 }) {
   const theme = createMemo(() => props.theme())
   const footer = createMemo(() => theme().footer)
@@ -89,6 +92,11 @@ export function RunFooterSubagentBody(props: {
   ))
   let scroll: ScrollBoxRenderable | undefined
 
+  const interruptHint = createMemo(() => {
+    if (tab()?.status !== "running") return undefined
+    return props.interrupt?.()
+  })
+
   useKeyboard((event) => {
     if (!props.active()) {
       return
@@ -139,6 +147,13 @@ export function RunFooterSubagentBody(props: {
                   <span style={{ fg: footer().muted }}>{"  " + subtitle()}</span>
                 </Show>
               </text>
+              <Show when={interruptHint()}>
+                {(hint) => (
+                  <text fg={footer().muted} wrapMode="none" truncate flexShrink={0}>
+                    {hint()} interrupt
+                  </text>
+                )}
+              </Show>
               <Show when={props.total() > 1 && props.index() > 0}>
                 <text fg={footer().muted} wrapMode="none" truncate flexShrink={0}>
                   {props.index()} of {props.total()}

packages/opencode/src/cli/cmd/run/footer.ts

@@ -55,7 +55,7 @@ import type {
   RunInput,
   RunPrompt,
   RunProvider,
-  RunResource,
+  RunReference,
   RunTuiConfig,
   StreamCommit,
 } from "./types"
@@ -71,7 +71,7 @@ type RunFooterOptions = {
   directory: string
   findFiles: (query: string) => Promise<string[]>
   agents: RunAgent[]
-  resources: RunResource[]
+  references: RunReference[]
   commands?: RunCommand[]
   wrote?: boolean
   sessionID: () => string | undefined
@@ -97,6 +97,7 @@ type RunFooterOptions = {
   onEditorOpen: (input: { value: string }) => Promise<string | undefined>
   onExit?: () => void
   onSubagentSelect?: (sessionID: string | undefined) => void
+  onSubagentInterrupt?: (sessionID: string) => void
   treeSitterClient?: TreeSitterClient
 }
 
@@ -180,8 +181,8 @@ export class RunFooter implements FooterApi {
   private rows = TEXTAREA_MIN_ROWS
   private agents: Accessor<RunAgent[]>
   private setAgents: Setter<RunAgent[]>
-  private resources: Accessor<RunResource[]>
-  private setResources: Setter<RunResource[]>
+  private references: Accessor<RunReference[]>
+  private setReferences: Setter<RunReference[]>
   private commands: Accessor<RunCommand[] | undefined>
   private setCommands: Setter<RunCommand[] | undefined>
   private providers: Accessor<RunProvider[] | undefined>
@@ -255,9 +256,9 @@ export class RunFooter implements FooterApi {
     const [agents, setAgents] = createSignal(options.agents)
     this.agents = agents
     this.setAgents = setAgents
-    const [resources, setResources] = createSignal(options.resources)
-    this.resources = resources
-    this.setResources = setResources
+    const [references, setReferences] = createSignal(options.references)
+    this.references = references
+    this.setReferences = setReferences
     const [commands, setCommands] = createSignal<RunCommand[] | undefined>(options.commands)
     this.commands = commands
     this.setCommands = setCommands
@@ -311,7 +312,7 @@ export class RunFooter implements FooterApi {
               queuedPrompts: footer.queuedPrompts,
               findFiles: options.findFiles,
               agents: footer.agents,
-              resources: footer.resources,
+              references: footer.references,
               commands: footer.commands,
               providers: footer.providers,
               currentModel: footer.currentModel,
@@ -341,6 +342,7 @@ export class RunFooter implements FooterApi {
               onLayout: footer.syncLayout,
               onStatus: footer.setStatus,
               onSubagentSelect: options.onSubagentSelect,
+              onSubagentInterrupt: options.onSubagentInterrupt,
               onQueuedRemove: footer.handleQueuedRemove,
             })
           },
@@ -411,7 +413,7 @@ export class RunFooter implements FooterApi {
       }
 
       this.setAgents(next.agents)
-      this.setResources(next.resources)
+      this.setReferences(next.references)
       if (next.commands !== undefined) {
         this.setCommands(next.commands)
       }

packages/opencode/src/cli/cmd/run/footer.view.tsx

@@ -50,7 +50,7 @@ import type {
   RunInput,
   RunPrompt,
   RunProvider,
-  RunResource,
+  RunReference,
   RunTuiConfig,
 } from "./types"
 import type { RunTheme } from "./theme"
@@ -74,7 +74,7 @@ type RunFooterViewProps = {
   directory: string
   findFiles: (query: string) => Promise<string[]>
   agents: () => RunAgent[]
-  resources: () => RunResource[]
+  references: () => RunReference[]
   commands: () => RunCommand[] | undefined
   providers: () => RunProvider[] | undefined
   currentModel: () => RunInput["model"]
@@ -108,6 +108,7 @@ type RunFooterViewProps = {
   onLayout: (input: { route: FooterPromptRoute; autocomplete: boolean; subagentRows: number }) => void
   onStatus: (text: string) => void
   onSubagentSelect?: (sessionID: string | undefined) => void
+  onSubagentInterrupt?: (sessionID: string) => void
   onQueuedRemove: (messageID: string) => Promise<boolean>
 }
 
@@ -213,6 +214,15 @@ export function RunFooterView(props: RunFooterViewProps) {
         props.tuiConfig,
       ) ?? "",
   )
+  const subagentInterruptShortcut = useKeymapSelector(
+    (keymap: OpenTuiKeymap) =>
+      formatKeySequence(
+        keymap
+          .getCommandBindings({ visibility: "registered", commands: ["subagent.interrupt"] })
+          .get("subagent.interrupt")?.[0]?.sequence,
+        props.tuiConfig,
+      ) ?? "",
+  )
   const interrupt = useKeymapSelector(
     (keymap: OpenTuiKeymap) =>
       formatKeySequence(
@@ -358,7 +368,7 @@ export function RunFooterView(props: RunFooterViewProps) {
     directory: props.directory,
     findFiles: props.findFiles,
     agents: props.agents,
-    resources: props.resources,
+    references: props.references,
     commands: props.commands,
     tuiConfig: props.tuiConfig,
     state: props.state,
@@ -520,7 +530,7 @@ export function RunFooterView(props: RunFooterViewProps) {
 
   useBindings(() => ({
     mode: OPENCODE_BASE_MODE,
-    enabled: active().type === "prompt" && route().type === "composer" && foregroundSubagents(),
+    enabled: active().type === "prompt" && route().type === "composer" && foregroundSubagents() && !!props.onBackground,
     priority: 1,
     commands: [
       {
@@ -561,6 +571,32 @@ export function RunFooterView(props: RunFooterViewProps) {
     bindings: props.tuiConfig.keybinds.get("session.queued_prompts"),
   }))
 
+  useBindings(() => ({
+    mode: OPENCODE_BASE_MODE,
+    enabled:
+      active().type === "prompt" &&
+      route().type === "subagent" &&
+      selectedTab()?.status === "running" &&
+      !!props.onSubagentInterrupt,
+    priority: 1,
+    commands: [
+      {
+        name: "subagent.interrupt",
+        title: "Interrupt subagent",
+        category: "Session",
+        run: () => {
+          const current = selectedTab()
+          if (current?.status !== "running") {
+            return
+          }
+
+          props.onSubagentInterrupt?.(current.sessionID)
+        },
+      },
+    ],
+    bindings: [{ key: "ctrl+d", desc: "Interrupt subagent", group: "Subagents", cmd: "subagent.interrupt" }],
+  }))
+
   createEffect(() => {
     const current = route()
     if (current.type !== "subagent") {
@@ -935,6 +971,7 @@ export function RunFooterView(props: RunFooterViewProps) {
             diffStyle={props.diffStyle}
             onCycle={cycleTab}
             onClose={closeTab}
+            interrupt={() => subagentInterruptShortcut() || undefined}
           />
         </box>
       </Show>