refactor(ai): align multimodal naming

fix: preserve provider error status (#39976 )
fix(tui): prevent sidebar scrollbar flash (#40056 )
2026-08-01 16:03:19 -04:00 · 2026-08-01 11:35:11 -05:00 · 2026-08-01 11:06:00 -05:00 · 2026-08-01 15:12:37 +00:00 · 2026-08-01 14:54:46 +00:00 · 2026-08-01 01:05:18 +00:00
347 changed files with 8852 additions and 5802 deletions
@@ -67,6 +67,7 @@
        "@opencode-ai/sdk": "file:vendor/opencode-ai-sdk-1.18.8-dev.tgz",
        "@opencode-ai/session-ui": "workspace:*",
        "@opencode-ai/ui": "workspace:*",
+        "@opencode-ai/util": "workspace:*",
        "@pierre/trees": "1.0.0-beta.4",
        "@sentry/solid": "catalog:",
        "@shikijs/transformers": "3.9.2",
@@ -87,7 +88,6 @@
        "@tanstack/solid-query": "5.91.4",
        "@tanstack/solid-virtual": "catalog:",
        "@thisbeyond/solid-dnd": "0.7.5",
-        "diff": "catalog:",
        "effect": "catalog:",
        "fuzzysort": "catalog:",
        "ghostty-web": "github:anomalyco/ghostty-web#83c0a07b8628b748aed073b232cb4b52a6ca11c1",
@@ -143,7 +143,10 @@
        "open": "10.1.2",
        "semver": "catalog:",
        "solid-js": "catalog:",
+        "tree-sitter-bash": "0.25.0",
+        "tree-sitter-powershell": "0.25.10",
        "uqr": "0.1.3",
+        "web-tree-sitter": "0.25.10",
        "ws": "8.21.0",
      },
      "devDependencies": {
@@ -380,7 +383,6 @@
        "@opencode-ai/ai": "workspace:*",
        "@opencode-ai/codemode": "workspace:*",
        "@opencode-ai/effect-drizzle-sqlite": "workspace:*",
-        "@opencode-ai/effect-sqlite-node": "workspace:*",
        "@opencode-ai/plugin": "workspace:*",
        "@opencode-ai/schema": "workspace:*",
        "@opencode-ai/util": "workspace:*",
@@ -401,9 +403,11 @@
        "ignore": "7.0.5",
        "immer": "11.1.4",
        "jsonc-parser": "3.3.1",
-        "semver": "^7.6.3",
+        "tree-sitter-bash": "0.25.0",
+        "tree-sitter-powershell": "0.25.10",
        "turndown": "7.2.0",
        "venice-ai-sdk-provider": "2.1.1",
+        "web-tree-sitter": "0.25.10",
        "which": "6.0.1",
        "zod": "catalog:",
      },
@@ -420,7 +424,6 @@
        "@tsconfig/bun": "catalog:",
        "@types/bun": "catalog:",
        "@types/node": "catalog:",
-        "@types/semver": "catalog:",
        "@types/turndown": "5.0.5",
        "@types/which": "3.0.4",
        "drizzle-kit": "catalog:",
@@ -514,6 +517,7 @@
        "@opencode-ai/core": "workspace:*",
        "@opencode-ai/session-ui": "workspace:*",
        "@opencode-ai/ui": "workspace:*",
+        "@opencode-ai/util": "workspace:*",
        "@pierre/diffs": "catalog:",
        "@solidjs/meta": "catalog:",
        "@solidjs/router": "catalog:",
@@ -1073,9 +1077,11 @@
  },
  "trustedDependencies": [
    "esbuild",
+    "tree-sitter-powershell",
    "protobufjs",
    "electron",
    "web-tree-sitter",
+    "tree-sitter-bash",
  ],
  "patchedDependencies": {
    "@pierre/trees@1.0.0-beta.4": "patches/@pierre%2Ftrees@1.0.0-beta.4.patch",
@@ -4072,10 +4078,10 @@

    "fetch-blob": ["fetch-blob@3.2.0", "", { "dependencies": { "node-domexception": "^1.0.0", "web-streams-polyfill": "^3.0.3" } }, "sha512-7yAQpD2UMJzLi1Dqv7qFYnPbaPx7ZfFK6PiIxQ4PfkGPyNyl2Ugx+a/umUonmKqjhM4DnfbMvdX6otXq83soQQ=="],

-    "file-uri-to-path": ["file-uri-to-path@1.0.0", "", {}, "sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw=="],
-
    "ffi-rs": ["ffi-rs@1.3.2", "", { "optionalDependencies": { "@yuuang/ffi-rs-android-arm64": "1.3.2", "@yuuang/ffi-rs-darwin-arm64": "1.3.2", "@yuuang/ffi-rs-darwin-x64": "1.3.2", "@yuuang/ffi-rs-linux-arm-gnueabihf": "1.3.2", "@yuuang/ffi-rs-linux-arm64-gnu": "1.3.2", "@yuuang/ffi-rs-linux-arm64-musl": "1.3.2", "@yuuang/ffi-rs-linux-x64-gnu": "1.3.2", "@yuuang/ffi-rs-linux-x64-musl": "1.3.2", "@yuuang/ffi-rs-win32-arm64-msvc": "1.3.2", "@yuuang/ffi-rs-win32-ia32-msvc": "1.3.2", "@yuuang/ffi-rs-win32-x64-msvc": "1.3.2" } }, "sha512-4s8dX9VbBw/jd5NOuE3EJRqXaIVdjMyiumeeDzrOhtjQRwp6Bz2za7iksWXTnvTQKV/tTdm1s1w7mObe92zPjQ=="],

+    "file-uri-to-path": ["file-uri-to-path@1.0.0", "", {}, "sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw=="],
+
    "filelist": ["filelist@1.0.6", "", { "dependencies": { "minimatch": "^5.0.1" } }, "sha512-5giy2PkLYY1cP39p17Ech+2xlpTRL9HLspOfEgm0L6CwBXBTgsK5ou0JtzYuepxkaQ/tvhCFIJ5uXo0OrM2DxA=="],

    "fill-range": ["fill-range@7.1.1", "", { "dependencies": { "to-regex-range": "^5.0.1" } }, "sha512-YsGpe3WHLK8ZYi4tWDg2Jy3ebRz2rXowDxnld4bkQB00cc/1Zw9AWnC0i9ztDJitivtQvaI9KaLyKrc+hBW0yg=="],
@@ -5634,6 +5640,10 @@

    "traverse": ["traverse@0.3.9", "", {}, "sha512-iawgk0hLP3SxGKDfnDJf8wTz4p2qImnyihM5Hh/sGvQ3K37dPi/w8sRhdNIxYA1TwFwc5mDhIJq+O0RsvXBKdQ=="],

+    "tree-sitter-bash": ["tree-sitter-bash@0.25.0", "", { "dependencies": { "node-addon-api": "^8.2.1", "node-gyp-build": "^4.8.2" }, "peerDependencies": { "tree-sitter": "^0.25.0" }, "optionalPeers": ["tree-sitter"] }, "sha512-gZtlj9+qFS81qKxpLfD6H0UssQ3QBc/F0nKkPsiFDyfQF2YBqYvglFJUzchrPpVhZe9kLZTrJ9n2J6lmka69Vg=="],
+
+    "tree-sitter-powershell": ["tree-sitter-powershell@0.25.10", "", { "dependencies": { "node-addon-api": "^7.1.0", "node-gyp-build": "^4.8.0" }, "peerDependencies": { "tree-sitter": "^0.25.0" }, "optionalPeers": ["tree-sitter"] }, "sha512-bEt8QoySpGFnU3aa8WedQyNMaN6aTwy/WUbvIVt0JSKF+BbJoSHNHu+wCbhj7xLMsfB0AuffmiJm+B8gzva8Lg=="],
+
    "treeverse": ["treeverse@3.0.0", "", {}, "sha512-gcANaAnd2QDZFmHFEOF4k7uc1J/6a6z3DJMd/QwEyxLoKGiptJRwid582r7QIsFlFMIZ3SnxfS52S4hm2DHkuQ=="],

    "trim-lines": ["trim-lines@3.0.1", "", {}, "sha512-kRj8B+YHZCc9kQYdWfJB2/oUl9rA99qbowYYBtr4ui4mZyAQ2JpvVBd/6U2YloATfqBhBTSMhTpgBHtU0Mf3Rg=="],
@@ -6856,6 +6866,8 @@

    "topojson-client/commander": ["commander@2.20.3", "", {}, "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ=="],

+    "tree-sitter-bash/node-addon-api": ["node-addon-api@8.9.0", "", {}, "sha512-ekZMeaaIzSQTSpr7X2X3iJM7lTzgnx8ahAG9pJfT/7+14mlEM8ZYQ9cgCDvSSRbReFK0oHli3WrZdCiRsgAT9Q=="],
+
    "tw-to-css/postcss": ["postcss@8.4.31", "", { "dependencies": { "nanoid": "^3.3.6", "picocolors": "^1.0.0", "source-map-js": "^1.0.2" } }, "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ=="],

    "tw-to-css/tailwindcss": ["tailwindcss@3.3.2", "", { "dependencies": { "@alloc/quick-lru": "^5.2.0", "arg": "^5.0.2", "chokidar": "^3.5.3", "didyoumean": "^1.2.2", "dlv": "^1.1.3", "fast-glob": "^3.2.12", "glob-parent": "^6.0.2", "is-glob": "^4.0.3", "jiti": "^1.18.2", "lilconfig": "^2.1.0", "micromatch": "^4.0.5", "normalize-path": "^3.0.0", "object-hash": "^3.0.0", "picocolors": "^1.0.0", "postcss": "^8.4.23", "postcss-import": "^15.1.0", "postcss-js": "^4.0.1", "postcss-load-config": "^4.0.1", "postcss-nested": "^6.0.1", "postcss-selector-parser": "^6.0.11", "postcss-value-parser": "^4.2.0", "resolve": "^1.22.2", "sucrase": "^3.32.0" }, "bin": { "tailwind": "lib/cli.js", "tailwindcss": "lib/cli.js" } }, "sha512-9jPkMiIBXvPc2KywkraqsUfbfj+dHDb+JPWtSJa9MLFdrPyazI7q6WX2sUrm7R9eVR7qqv3Pas7EvQFzxKnI6w=="],
@@ -10,7 +10,9 @@

 ## Conventions

-Per-type constructors live on the type, not as top-level re-exports. Use `Message.system(...)`, `Message.user(...)`, `Message.assistant(...)`, `Message.tool(...)`, `Model.make(...)`, `ToolDefinition.make(...)`, `ToolCallPart.make(...)`, `ToolResultPart.make(...)`, `ToolChoice.make(...)`, `ToolChoice.named(...)`, `SystemPart.make(...)`, and `GenerationOptions.make(...)` directly. The top-level `LLM` namespace is reserved for request-shaped call APIs: `LLM.request`, `LLM.generate`, `LLM.stream`, `LLM.updateRequest`, and `LLM.generateObject`. Two ways to construct the same thing is one too many.
+Per-type constructors live on the type, not as top-level re-exports. Use `Message.system(...)`, `Message.user(...)`, `Message.assistant(...)`, `Message.tool(...)`, `LanguageModel.make(...)`, `ToolDefinition.make(...)`, `ToolCallPart.make(...)`, `ToolResultPart.make(...)`, `ToolChoice.make(...)`, `ToolChoice.named(...)`, `SystemPart.make(...)`, and `GenerationOptions.make(...)` directly. The top-level `LLM` namespace is reserved for request-shaped call APIs: `LLM.request`, `LLM.generate`, `LLM.stream`, `LLM.updateRequest`, and `LLM.generateObject`. Two ways to construct the same thing is one too many.
+
+- Keep provider-defined string enums forward-compatible. Expose known values for autocomplete while accepting future values with `Known | (string & {})`; use `Schema.String` at runtime unless rejecting unknown values is required for correctness.

 ## Tests

@@ -74,7 +76,7 @@ export const route = Route.make({
 })
 ```

-Route defaults are request-shaping defaults such as `headers`, `limits`, `generation`, `providerOptions`, and `http`. Endpoint host/query belongs on the route endpoint. Selected `Model` values carry only model id, provider id, and the configured route value. Model capability/catalog metadata lives outside this package; protocol support is enforced by request lowering and typed `LLMError`s.
+Route defaults are request-shaping defaults such as `headers`, `limits`, `generation`, `providerOptions`, and `http`. Endpoint host/query belongs on the route endpoint. Selected `LanguageModel` values carry only model id, provider id, and the configured route value. Model capability/catalog metadata lives outside this package; protocol support is enforced by request lowering and typed `AIError`s.

 The four-axis decomposition is the reason DeepSeek, TogetherAI, Cerebras, Baseten, Fireworks, and DeepInfra all reuse `OpenAIChat.protocol` verbatim — each provider deployment is a 5-15 line `Route.make(...)` call instead of a 300-400 line route clone. Bug fixes in one protocol propagate to every consumer of that protocol in a single commit.

@@ -126,7 +128,7 @@ const selected = model("gpt-5", {
 })
 ```

-Keep semantic APIs as separate entrypoints, such as OpenAI `chat` and `responses`. Keep transport choices inside the semantic entrypoint settings, so OpenAI Responses HTTP and WebSocket share one entrypoint. Provider facades may still expose named selectors such as `responsesWebSocket` for direct typed call sites; the package-like contract maps its settings to those selectors before returning an executable `Model`.
+Keep semantic APIs as separate entrypoints, such as OpenAI `chat` and `responses`. Keep transport choices inside the semantic entrypoint settings, so OpenAI Responses HTTP and WebSocket share one entrypoint. Provider facades may still expose named selectors such as `responsesWebSocket` for direct typed call sites; the package-like contract maps its settings to those selectors before returning an executable `LanguageModel`.

 Do not expose `Route` in provider package settings. Route composition stays an implementation detail behind `model(...)`.

@@ -136,10 +138,10 @@ Do not expose `Route` in provider package settings. Route composition stays an i
 packages/ai/src/
  schema/                   canonical Schema model, split by concern
    ids.ts                  branded IDs, literal types, ProviderMetadata
-    options.ts              Generation/Provider/Http options, Limits, Model, cache policy
+    options.ts              Generation/Provider/Http options, Limits, LanguageModel, cache policy
    messages.ts             content parts, Message, ToolDefinition, LLMRequest
    events.ts               Usage, individual events, LLMEvent, LLMResponse
-    errors.ts               error reasons, LLMError, ToolFailure
+    errors.ts               error reasons, AIError, ToolFailure
    index.ts                barrel
  llm.ts                    request constructors and convenience helpers
  route/
@@ -96,7 +96,7 @@ contains identity, capabilities, pricing metadata, provider-specific option
 types, reusable request-behavior defaults, and hidden execution behavior.

 Normal users do not need to learn the current `Route` composite. Protocol,
-endpoint, auth, transport, and hooks are bound behind `Model`.
+endpoint, auth, transport, and hooks are bound behind `LanguageModel`.

 ### Request

@@ -539,7 +539,7 @@ Hosted tools do not pretend to have local handlers, and callers do not inspect a

 ### Run stream

-`LLM.stream` returns an Effect `Stream<RunEvent, LLMError, Requirements>`.
+`LLM.stream` returns an Effect `Stream<RunEvent, AIError, Requirements>`.
 Run events explicitly expose orchestration boundaries:

 ```ts
@@ -828,11 +828,11 @@ portable semantic guarantee.

 ## Error Model

-The Effect error channel is a tagged domain union rather than one `LLMError`
+The Effect error channel is a tagged domain union rather than one `AIError`
 wrapper with nested reasons. Illustrative categories:

 ```ts
-type LLMError =
+type AIError =
  | AuthenticationError
  | InvalidRequestError
  | UnsupportedCapabilityError
@@ -1079,7 +1079,7 @@ The redesign intentionally removes or changes these current concepts:
 | `LLM.generate` means one turn           | `LLM.generate` means complete run                           |
 | `LLMClient.generate/stream`             | `LLM.generateTurn/streamTurn` for one turn                  |
 | `LLMClient.layer` requirement           | Standard Effect requirements exposed directly               |
-| Public `Route` mental model             | Hidden behind executable `Model`                            |
+| Public `Route` mental model             | Hidden behind executable `LanguageModel`                    |
 | `Provider.make` structural helper       | Experimental declarative `Provider.define`                  |
 | Schema classes as canonical values      | Plain immutable values plus schema subpath                  |
 | `LLM.updateRequest`                     | Object spread                                               |
@@ -1089,7 +1089,7 @@ The redesign intentionally removes or changes these current concepts:
 | `generateObject`                        | Typed `output` option on `generate`                         |
 | One event union for provider output     | Separate `TurnEvent` and `RunEvent` unions                  |
 | `providerExecuted` dispatch check       | Distinct hosted-tool constructors                           |
-| One wrapped `LLMError`                  | Tagged domain error union                                   |
+| One wrapped `AIError`                   | Tagged domain error union                                   |

 OpenCode should migrate to `generateTurn` / `streamTurn`, preserving its durable
 prompt admission, persistence, permission, tool settlement, and continuation
@@ -195,7 +195,7 @@ The hosted result is represented as a provider-executed tool call and tool resul
 - **`LLM.request({...})`** — build a provider-neutral `LLMRequest`. Accepts ergonomic inputs (`system: string`, `prompt: string`) that normalize into the canonical Schema classes.
 - **`LLM.generate` / `LLM.stream`** — re-exported from `LLMClient` for one-import use.
 - **`Message.user(...)` / `Message.assistant(...)` / `Message.tool(...)`** — message constructors from the canonical schema model.
- **`Model.make(...)` / `ToolCallPart.make(...)` / `ToolResultPart.make(...)` / `ToolDefinition.make(...)`** — model and tool-related constructors from the canonical schema model.
+- **`LanguageModel.make(...)` / `ToolCallPart.make(...)` / `ToolResultPart.make(...)` / `ToolDefinition.make(...)`** — model and tool-related constructors from the canonical schema model.
 - **`LLMEvent.is.*`** — typed guards (`is.textDelta`, `is.toolCall`, `is.finish`, …) for filtering streams.
 - **`Image.generate({...})`** — generate images through a provider-neutral image request and response model.
 - **`ImageClient`** — Effect service and layer for image execution, parallel to `LLMClient`.
@@ -33,7 +33,7 @@ Keep durable identity separate from runtime capability:

 - Durable identity is small serializable data like `{ providerID, modelID }` for
  config, sessions, logs, and catalogs.
- Runtime capability is a `Model` with a route value, protocol, transport, auth,
+- Runtime capability is a `LanguageModel` with a route value, protocol, transport, auth,
  and defaults. It is allowed to contain functions and schemas.
 - If persisted identity needs to become executable, resolve it through an app
  boundary first. Do not make `LLMRequest` recover behavior from a global route
@@ -137,7 +137,7 @@ starts hiding the real provider-specific config.
   - accepts model id only
   - returns executable models
   - does not accept endpoint/auth/deployment overrides
-4. **Model**
+4. **Language Model**
   - model id
   - route value
   - provider id
@@ -164,7 +164,7 @@ execution mechanism:
 ```ts
 type ProviderFacade<APIs, Config> = {
  readonly id: ProviderID
-  readonly model: (id: string) => Model
+  readonly model: (id: string) => LanguageModel
  readonly configure: (input?: Config) => ProviderFacade<APIs, Config>
 } & APIs
 ```
@@ -181,8 +181,8 @@ export const OpenAI = {
  configure: configureOpenAI,
 } satisfies ProviderFacade<
  {
-    responses: (id: string) => Model
-    chat: (id: string) => Model
+    responses: (id: string) => LanguageModel
+    chat: (id: string) => LanguageModel
  },
  OpenAIConfig
 >
@@ -528,7 +528,7 @@ The chosen split is:
 ```txt
 Route = execution mechanics
 Provider facade = configured route group
-Model = selected executable model carrying route value
+LanguageModel = selected executable model carrying route value
 App boundary = explicit durable-config -> typed-provider call
 ```

@@ -549,13 +549,13 @@ App boundary = explicit durable-config -> typed-provider call
  entrypoint maps its scoped `transport` setting before constructing the model.
 - No separate public `LLMClient.layerWithWebSocket`. The runtime should expose one
  client layer with the available transport capabilities.
- No executable `ModelRef`. The executable handle is `Model`; durable model
+- No executable `ModelRef`. The executable handle is `LanguageModel`; durable model
  identity stays separate and cannot execute on its own.

 ## Implementation Todo

- [x] Replace the current executable `ModelRef` with `Model`.
- [x] Change `Model.route` to carry a route value, not a `RouteID` string.
+- [x] Replace the current executable `ModelRef` with `LanguageModel`.
+- [x] Change `LanguageModel.route` to carry a route value, not a `RouteID` string.
 - [ ] Keep a separate durable model identity type for persisted/session/catalog
      data, likely `{ providerID, modelID }`, and make it clear that it cannot
      execute without resolver context.
@@ -566,7 +566,7 @@ App boundary = explicit durable-config -> typed-provider call
 - [x] Remove endpoint/auth escape hatches from route model selection; callers must
      configure endpoint/auth through `route.with(...)` or provider facades before
      calling `.model(...)`.
- [x] Remove request-shaping defaults from `Model`; selected models now carry only
+- [x] Remove request-shaping defaults from `LanguageModel`; selected models now carry only
      id, provider, and configured route while defaults live on routes or requests.
 - [x] Rework `LLMClient.stream` / `generate` to read
      `request.model.route` directly instead of calling `registeredRoute(...)`.
@@ -38,7 +38,7 @@ const resolve = (policy: CachePolicy | undefined): CachePolicyObject => {
 // Protocols whose wire format ignores inline cache markers (OpenAI's implicit
 // prefix caching, Gemini's implicit + out-of-band CachedContent). Skip the
 // whole policy pass for these — emitting hints would be harmless but pointless.
-const RESPECTS_INLINE_HINTS = new Set(["anthropic-messages", "bedrock-converse"])
+const RESPECTS_INLINE_HINTS = new Set(["anthropic-messages", "bedrock-converse", "openrouter"])

 const makeHint = (ttlSeconds: number | undefined): CacheHint =>
  ttlSeconds !== undefined ? new CacheHint({ type: "ephemeral", ttlSeconds }) : new CacheHint({ type: "ephemeral" })
@@ -133,6 +133,7 @@ const countHints = (request: LLMRequest) =>

 export const applyCachePolicy = (request: LLMRequest): LLMRequest => {
  if (!RESPECTS_INLINE_HINTS.has(request.model.route.id)) return request
+  if (request.model.route.id === "openrouter" && (request.cache === undefined || request.cache === "auto")) return request
  const policy = resolve(request.cache)
  if (!policy.tools && !policy.system && !policy.messages) return request

@@ -1,25 +1,25 @@
 import { Context, Effect, Layer } from "effect"
 import { RequestExecutor } from "./route/executor"
 import type { ImageOptions, ImageRequest, ImageRequestFor, ImageResponse } from "./image"
-import type { LLMError } from "./schema"
+import type { AIError } from "./schema"

 export type Execute = RequestExecutor.Interface["execute"]

 export interface Interface {
  readonly generate: <Options extends ImageOptions>(
    request: ImageRequestFor<Options>,
-  ) => Effect.Effect<ImageResponse, LLMError>
+  ) => Effect.Effect<ImageResponse, AIError>
 }

 export class Service extends Context.Service<Service, Interface>()("@opencode/ImageClient") {}

 export const generate = <Options extends ImageOptions>(
  request: ImageRequestFor<Options>,
-): Effect.Effect<ImageResponse, LLMError> =>
+): Effect.Effect<ImageResponse, AIError> =>
  Effect.gen(function* () {
    const client = yield* Service
    return yield* client.generate(request)
-  }) as Effect.Effect<ImageResponse, LLMError>
+  }) as Effect.Effect<ImageResponse, AIError>

 export const layer: Layer.Layer<Service, never, RequestExecutor.Service> = Layer.effect(
  Service,
@@ -1,13 +1,10 @@
 import { Effect, Schema } from "effect"
-import { HttpOptions, InvalidRequestReason, LLMError, ModelID, ProviderID, ProviderMetadata, Usage } from "./schema"
+import { HttpOptions, InvalidRequestReason, AIError, ModelID, ProviderID, ProviderMetadata, Usage } from "./schema"
 import { ImageClient, Service, type Execute as ImageExecute } from "./image-client"

 export interface ImageRoute<Options extends ImageOptions = ImageOptions> {
  readonly id: string
-  readonly generate: (
-    request: ImageRequestFor<Options>,
-    execute: ImageExecute,
-  ) => Effect.Effect<ImageResponse, LLMError>
+  readonly generate: (request: ImageRequestFor<Options>, execute: ImageExecute) => Effect.Effect<ImageResponse, AIError>
 }

 export type ImageOptions = Record<string, unknown>
@@ -146,13 +143,13 @@ export function request(input: ImageRequest | ImageRequestInput) {

 export function generate<const Model extends object>(
  input: ImageRequestInput<Model>,
-): Effect.Effect<ImageResponse, LLMError, Service>
-export function generate(input: ImageRequest): Effect.Effect<ImageResponse, LLMError, Service>
+): Effect.Effect<ImageResponse, AIError, Service>
+export function generate(input: ImageRequest): Effect.Effect<ImageResponse, AIError, Service>
 export function generate(input: ImageRequest | ImageRequestInput) {
  return Effect.try({
    try: () => (input instanceof ImageRequest ? input : request(input)),
    catch: (error) =>
-      new LLMError({
+      new AIError({
        module: "Image",
        method: "generate",
        reason: new InvalidRequestReason({ message: error instanceof Error ? error.message : String(error) }),
@@ -5,8 +5,8 @@ export { Provider } from "./provider"
 export { ProviderPackage } from "./provider-package"
 export { isContextOverflow, isContextOverflowFailure } from "./provider-error"
 export type {
-  RouteModelInput,
-  RouteRoutedModelInput,
+  RouteLanguageModelInput,
+  RouteRoutedLanguageModelInput,
  Interface as LLMClientShape,
  Service as LLMClientService,
 } from "./route/client"
@@ -33,7 +33,7 @@ export type {
 export * as LLM from "./llm"
 export type {
  Definition as ProviderDefinition,
-  ModelFactory as ProviderModelFactory,
-  ModelOptions as ProviderModelOptions,
+  LanguageModelFactory as ProviderLanguageModelFactory,
+  LanguageModelOptions as ProviderLanguageModelOptions,
 } from "./provider"
 export type { Definition as ProviderPackageDefinition, Settings as ProviderPackageSettings } from "./provider-package"
@@ -4,33 +4,33 @@ import {
  GenerationOptions,
  HttpOptions,
  InvalidProviderOutputReason,
-  LLMError,
+  AIError,
  LLMEvent,
  LLMRequest,
  LLMResponse,
  Message,
-  Model,
+  LanguageModel,
  SystemPart,
  ToolChoice,
  ToolDefinition,
  type ContentPart,
-  type ModelProviderOptions,
+  type LanguageModelProviderOptions,
 } from "./schema"
 import { make as makeTool, toDefinitions, type ToolSchema } from "./tool"

 /** Input accepted by `LLM.request`, normalized into the canonical `LLMRequest` class. */
-export type RequestInput<SelectedModel extends Model = Model> = Omit<
+export type RequestInput<SelectedLanguageModel extends LanguageModel = LanguageModel> = Omit<
  ConstructorParameters<typeof LLMRequest>[0],
  "model" | "system" | "messages" | "tools" | "toolChoice" | "generation" | "http" | "providerOptions"
 > & {
-  readonly model: SelectedModel
+  readonly model: SelectedLanguageModel
  readonly system?: string | SystemPart | ReadonlyArray<SystemPart>
  readonly prompt?: string | ContentPart | ReadonlyArray<ContentPart>
  readonly messages?: ReadonlyArray<Message | Message.Input>
  readonly tools?: ReadonlyArray<ToolDefinition.Input>
  readonly toolChoice?: ToolChoice.Input
  readonly generation?: GenerationOptions.Input
-  readonly providerOptions?: NoInfer<ModelProviderOptions<SelectedModel>>
+  readonly providerOptions?: NoInfer<LanguageModelProviderOptions<SelectedLanguageModel>>
  readonly http?: HttpOptions.Input
 }

@@ -38,7 +38,9 @@ export const generate = LLMClient.generate

 export const stream = LLMClient.stream

-export const request = <const SelectedModel extends Model>(input: RequestInput<SelectedModel>) => {
+export const request = <const SelectedLanguageModel extends LanguageModel>(
+  input: RequestInput<SelectedLanguageModel>,
+) => {
  const {
    system: requestSystem,
    prompt,
@@ -66,7 +68,10 @@ const GENERATE_OBJECT_TOOL_NAME = "generate_object"

 const GENERATE_OBJECT_TOOL_DESCRIPTION = "Return the structured result by calling this tool."

-type GenerateObjectBase<SelectedModel extends Model = Model> = Omit<RequestInput<SelectedModel>, "tools" | "toolChoice">
+type GenerateObjectBase<SelectedLanguageModel extends LanguageModel = LanguageModel> = Omit<
+  RequestInput<SelectedLanguageModel>,
+  "tools" | "toolChoice"
+>

 export class GenerateObjectResponse<T> {
  constructor(
@@ -83,13 +88,15 @@ export class GenerateObjectResponse<T> {
  }
 }

-export interface GenerateObjectOptions<S extends ToolSchema<any>, SelectedModel extends Model = Model>
-  extends GenerateObjectBase<SelectedModel> {
+export interface GenerateObjectOptions<
+  S extends ToolSchema<any>,
+  SelectedLanguageModel extends LanguageModel = LanguageModel,
+> extends GenerateObjectBase<SelectedLanguageModel> {
  readonly schema: S
 }

-export interface GenerateObjectDynamicOptions<SelectedModel extends Model = Model>
-  extends GenerateObjectBase<SelectedModel> {
+export interface GenerateObjectDynamicOptions<SelectedLanguageModel extends LanguageModel = LanguageModel>
+  extends GenerateObjectBase<SelectedLanguageModel> {
  /** Raw JSON Schema object describing the expected output shape. */
  readonly jsonSchema: JsonSchema.JsonSchema
 }
@@ -108,7 +115,7 @@ const runGenerateObject = Effect.fn("LLM.generateObject")(function* (
    (event) => LLMEvent.is.toolCall(event) && event.name === GENERATE_OBJECT_TOOL_NAME,
  )
  if (!call || !LLMEvent.is.toolCall(call))
-    return yield* new LLMError({
+    return yield* new AIError({
      module: "LLM",
      method: "generateObject",
      reason: new InvalidProviderOutputReason({
@@ -118,7 +125,7 @@ const runGenerateObject = Effect.fn("LLM.generateObject")(function* (
  const object = yield* tool._decode(call.input).pipe(
    Effect.mapError(
      (error) =>
-        new LLMError({
+        new AIError({
          module: "LLM",
          method: "generateObject",
          reason: new InvalidProviderOutputReason({
@@ -138,16 +145,16 @@ const runGenerateObject = Effect.fn("LLM.generateObject")(function* (
 * Two input modes:
 *
 * 1. `schema: EffectSchema<T>` — `.object` is decoded and typed as `T`.
- *    Decode failures surface as `LLMError`.
+ *    Decode failures surface as `AIError`.
 * 2. `jsonSchema: JsonSchema.JsonSchema` — `.object` is `unknown`. Use when
 *    the schema is only available at runtime (MCP, plugin manifests). Caller validates.
 */
-export function generateObject<const SelectedModel extends Model, S extends ToolSchema<any>>(
-  options: GenerateObjectOptions<S, SelectedModel>,
-): Effect.Effect<GenerateObjectResponse<Schema.Schema.Type<S>>, LLMError>
-export function generateObject<const SelectedModel extends Model>(
-  options: GenerateObjectDynamicOptions<SelectedModel>,
-): Effect.Effect<GenerateObjectResponse<unknown>, LLMError>
+export function generateObject<const SelectedLanguageModel extends LanguageModel, S extends ToolSchema<any>>(
+  options: GenerateObjectOptions<S, SelectedLanguageModel>,
+): Effect.Effect<GenerateObjectResponse<Schema.Schema.Type<S>>, AIError>
+export function generateObject<const SelectedLanguageModel extends LanguageModel>(
+  options: GenerateObjectDynamicOptions<SelectedLanguageModel>,
+): Effect.Effect<GenerateObjectResponse<unknown>, AIError>
 export function generateObject(options: GenerateObjectOptions<ToolSchema<any>> | GenerateObjectDynamicOptions) {
  if ("schema" in options) {
    const { schema, ...rest } = options
@@ -6,7 +6,7 @@ import { Endpoint } from "../route/endpoint"
 import { Framing } from "../route/framing"
 import { Protocol } from "../route/protocol"
 import {
-  LLMError,
+  AIError,
  LLMEvent,
  mergeJsonRecords,
  Usage,
@@ -242,16 +242,14 @@ const AnthropicUsage = Schema.StructWithRest(
    cache_creation_input_tokens: optionalNull(Schema.Number),
    cache_read_input_tokens: optionalNull(Schema.Number),
    server_tool_use: optionalNull(
-      Schema.StructWithRest(
-        Schema.Struct({ web_search_requests: Schema.optional(Schema.Number) }),
-        [Schema.Record(Schema.String, Schema.Unknown)],
-      ),
+      Schema.StructWithRest(Schema.Struct({ web_search_requests: Schema.optional(Schema.Number) }), [
+        Schema.Record(Schema.String, Schema.Unknown),
+      ]),
    ),
    output_tokens_details: optionalNull(
-      Schema.StructWithRest(
-        Schema.Struct({ thinking_tokens: Schema.optional(Schema.Number) }),
-        [Schema.Record(Schema.String, Schema.Unknown)],
-      ),
+      Schema.StructWithRest(Schema.Struct({ thinking_tokens: Schema.optional(Schema.Number) }), [
+        Schema.Record(Schema.String, Schema.Unknown),
+      ]),
    ),
  }),
  [Schema.Record(Schema.String, Schema.Unknown)],
@@ -725,8 +723,7 @@ const mergeUsage = (left: Usage | undefined, right: Usage | undefined) => {
    reasoningTokens,
    totalTokens: ProviderShared.totalTokens(inputTokens, outputTokens, undefined),
    providerMetadata: {
-      anthropic:
-        mergeJsonRecords(left.providerMetadata?.["anthropic"], right.providerMetadata?.["anthropic"]) ?? {},
+      anthropic: mergeJsonRecords(left.providerMetadata?.["anthropic"], right.providerMetadata?.["anthropic"]) ?? {},
    },
  })
 }
@@ -816,7 +813,8 @@ const onContentBlockStart = (state: ParserState, event: AnthropicEvent): StepRes
  if (block.type === "thinking" && block.thinking !== undefined) {
    const events: LLMEvent[] = []
    const id = `reasoning-${event.index ?? 0}`
-    const providerMetadata = block.signature === undefined ? undefined : anthropicMetadata({ signature: block.signature })
+    const providerMetadata =
+      block.signature === undefined ? undefined : anthropicMetadata({ signature: block.signature })
    const lifecycle = Lifecycle.reasoningStart(state.lifecycle, events, id, providerMetadata)
    return [
      {
@@ -980,7 +978,7 @@ const providerErrorMessage = (event: AnthropicEvent): string => {
 }

 const onError = (event: AnthropicEvent) =>
-  new LLMError({
+  new AIError({
    module: ADAPTER,
    method: "stream",
    reason: classifyProviderFailure({ message: providerErrorMessage(event), code: event.error?.type }),
@@ -3,7 +3,7 @@ import { Route } from "../route/client"
 import { Endpoint } from "../route/endpoint"
 import { Protocol } from "../route/protocol"
 import {
-  LLMError,
+  AIError,
  LLMEvent,
  Usage,
  type CacheHint,
@@ -11,7 +11,7 @@ import {
  type FinishReasonDetails,
  type JsonSchema,
  type LLMRequest,
-  type ModelToolSchemaCompatibility,
+  type LanguageModelToolSchemaCompatibility,
  type ProviderMetadata,
  type ReasoningPart,
  type ToolCallPart,
@@ -232,7 +232,7 @@ const lowerToolSpec = (tool: ToolDefinition, inputSchema: JsonSchema): BedrockTo
 })

 const lowerTools = (
-  compatibility: ModelToolSchemaCompatibility | undefined,
+  compatibility: LanguageModelToolSchemaCompatibility | undefined,
  breakpoints: BedrockCache.Breakpoints,
  tools: ReadonlyArray<ToolDefinition>,
 ): BedrockTool[] => {
@@ -274,9 +274,7 @@ const reasoningSignature = (part: ReasoningPart) => {

 const reasoningRedactedData = (part: ReasoningPart) => {
  const bedrock = part.providerMetadata?.bedrock
-  return ProviderShared.isRecord(bedrock) && typeof bedrock.redactedData === "string"
-    ? bedrock.redactedData
-    : undefined
+  return ProviderShared.isRecord(bedrock) && typeof bedrock.redactedData === "string" ? bedrock.redactedData : undefined
 }

 const lowerToolCall = (part: ToolCallPart): BedrockToolUseBlock => ({
@@ -656,7 +654,7 @@ const step = (state: ParserState, event: BedrockEvent) =>
      ] as const
    ).find((entry) => entry[1] !== undefined)
    if (exception) {
-      return yield* new LLMError({
+      return yield* new AIError({
        module: ADAPTER,
        method: "stream",
        reason: classifyProviderFailure({
@@ -29,9 +29,30 @@ export const DEFAULT_BASE_URL = "https://generativelanguage.googleapis.com/v1bet

 export interface OptionsInput {
  readonly [key: string]: unknown
+  readonly cachedContent?: string
+  readonly safetySettings?: ReadonlyArray<{
+    readonly category:
+      | "HARM_CATEGORY_UNSPECIFIED"
+      | "HARM_CATEGORY_HATE_SPEECH"
+      | "HARM_CATEGORY_DANGEROUS_CONTENT"
+      | "HARM_CATEGORY_HARASSMENT"
+      | "HARM_CATEGORY_SEXUALLY_EXPLICIT"
+      | "HARM_CATEGORY_CIVIC_INTEGRITY"
+      | (string & {})
+    readonly threshold:
+      | "HARM_BLOCK_THRESHOLD_UNSPECIFIED"
+      | "BLOCK_LOW_AND_ABOVE"
+      | "BLOCK_MEDIUM_AND_ABOVE"
+      | "BLOCK_ONLY_HIGH"
+      | "BLOCK_NONE"
+      | "OFF"
+      | (string & {})
+  }>
+  readonly serviceTier?: "standard" | "flex" | "priority" | (string & {})
  readonly thinkingConfig?: {
    readonly thinkingBudget?: number
    readonly includeThoughts?: boolean
+    readonly thinkingLevel?: "minimal" | "low" | "medium" | "high" | (string & {})
  }
 }

@@ -111,6 +132,12 @@ const GeminiToolConfig = Schema.Struct({
 const GeminiThinkingConfig = Schema.Struct({
  thinkingBudget: Schema.optional(Schema.Number),
  includeThoughts: Schema.optional(Schema.Boolean),
+  thinkingLevel: Schema.optional(Schema.String),
+})
+
+const GeminiSafetySetting = Schema.Struct({
+  category: Schema.String,
+  threshold: Schema.String,
 })

 const GeminiGenerationConfig = Schema.Struct({
@@ -123,7 +150,10 @@ const GeminiGenerationConfig = Schema.Struct({
 })

 const GeminiBodyFields = {
+  cachedContent: Schema.optional(Schema.String),
  contents: Schema.Array(GeminiContent),
+  safetySettings: optionalArray(GeminiSafetySetting),
+  serviceTier: Schema.optional(Schema.String),
  systemInstruction: Schema.optional(GeminiSystemInstruction),
  tools: optionalArray(GeminiTool),
  toolConfig: Schema.optional(GeminiToolConfig),
@@ -316,17 +346,38 @@ const lowerMessages = Effect.fn("Gemini.lowerMessages")(function* (request: LLMR
 })

 const resolveOptions = (request: LLMRequest) => {
-  const value = request.providerOptions?.gemini?.thinkingConfig
-  if (!ProviderShared.isRecord(value)) return {}
+  const input = request.providerOptions?.gemini
+  const value = input?.thinkingConfig
  const thinkingConfig = {
-    thinkingBudget: typeof value.thinkingBudget === "number" ? value.thinkingBudget : undefined,
-    includeThoughts: typeof value.includeThoughts === "boolean" ? value.includeThoughts : undefined,
+    thinkingBudget:
+      ProviderShared.isRecord(value) && typeof value.thinkingBudget === "number" ? value.thinkingBudget : undefined,
+    includeThoughts:
+      ProviderShared.isRecord(value) && typeof value.includeThoughts === "boolean"
+        ? value.includeThoughts
+        : ProviderShared.isRecord(value)
+          ? true
+          : undefined,
+    thinkingLevel:
+      ProviderShared.isRecord(value) && typeof value.thinkingLevel === "string" ? value.thinkingLevel : undefined,
  }
  return {
+    cachedContent: typeof input?.cachedContent === "string" ? input.cachedContent : undefined,
+    safetySettings: mapSafetySettings(input?.safetySettings),
+    serviceTier: typeof input?.serviceTier === "string" ? input.serviceTier : undefined,
    thinkingConfig: Object.values(thinkingConfig).some((item) => item !== undefined) ? thinkingConfig : undefined,
  }
 }

+function mapSafetySettings(value: unknown) {
+  if (!Array.isArray(value)) return undefined
+  const settings = value.flatMap((item) =>
+    ProviderShared.isRecord(item) && typeof item.category === "string" && typeof item.threshold === "string"
+      ? [{ category: item.category, threshold: item.threshold }]
+      : [],
+  )
+  return settings
+}
+
 const fromRequest = Effect.fn("Gemini.fromRequest")(function* (request: LLMRequest) {
  const hasTools = request.tools.length > 0
  const generation = request.generation
@@ -342,7 +393,10 @@ const fromRequest = Effect.fn("Gemini.fromRequest")(function* (request: LLMReque
  }

  return {
+    cachedContent: options.cachedContent,
    contents: yield* lowerMessages(request),
+    safetySettings: options.safetySettings,
+    serviceTier: options.serviceTier,
    systemInstruction:
      request.system.length === 0 ? undefined : { parts: [{ text: ProviderShared.joinText(request.system) }] },
    tools: hasTools
@@ -11,7 +11,7 @@ import {
 import { Auth, type Definition as AuthDefinition } from "../route/auth"
 import {
  InvalidProviderOutputReason,
-  LLMError,
+  AIError,
  Usage,
  mergeHttpOptions,
  mergeJsonRecords,
@@ -125,7 +125,7 @@ const nativeOptions = (options: GoogleImageOptions | undefined) => {
 }

 const invalidOutput = (message: string, providerMetadata?: ProviderMetadata) =>
-  new LLMError({
+  new AIError({
    module: ADAPTER,
    method: "generate",
    reason: new InvalidProviderOutputReason({ message, route: ADAPTER, providerMetadata }),
@@ -285,7 +285,7 @@ export const model = (input: ModelInput) => {
  return ImageModel.make<GoogleImageOptions>({ id: input.id, provider: "google", route, http: input.http })
 }

-const googleImagePart = (image: ImageInput): Effect.Effect<Record<string, unknown>, LLMError> => {
+const googleImagePart = (image: ImageInput): Effect.Effect<Record<string, unknown>, AIError> => {
  if (image.type === "bytes")
    return Effect.succeed({ inlineData: { mimeType: image.mediaType, data: Encoding.encodeBase64(image.data) } })
  if (image.type === "file-uri") return Effect.succeed({ fileData: { mimeType: image.mediaType, fileUri: image.uri } })
@@ -3,7 +3,7 @@ import type { Content } from "@opencode-ai/schema/tool"
 import { HttpTransport } from "../route/transport"
 import { Protocol } from "../route/protocol"
 import {
-  LLMError,
+  AIError,
  LLMEvent,
  Usage,
  type FinishReason,
@@ -434,10 +434,7 @@ const lowerMessages = Effect.fn("OpenResponses.lowerMessages")(function* (reques
        const groups = content.reduce<Array<{ phase: MessagePhase | null | undefined; parts: TextPart[] }>>(
          (groups, part) => {
            const metadata = part.providerMetadata?.[providerMetadataKey]
-            const phase =
-              ProviderShared.isRecord(metadata)
-                ? messagePhase(metadata.phase, extension)
-                : undefined
+            const phase = ProviderShared.isRecord(metadata) ? messagePhase(metadata.phase, extension) : undefined
            const group = groups.at(-1)
            if (group && group.phase === phase) group.parts.push(part)
            else groups.push({ phase, parts: [part] })
@@ -646,10 +643,7 @@ const onOutputTextDelta = (state: ParserState, event: Event, id: string): StepRe
  const phase = state.messagePhases[id]
  const metadata = phase === undefined ? undefined : providerMetadata(state, { phase })
  const lifecycle = Lifecycle.textStart(state.lifecycle, events, id, metadata)
-  return [
-    { ...state, lifecycle: Lifecycle.textDelta(lifecycle, events, id, event.delta) },
-    events,
-  ]
+  return [{ ...state, lifecycle: Lifecycle.textDelta(lifecycle, events, id, event.delta) }, events]
 }

 const onOutputTextDone = (state: ParserState, event: Event, id: string): StepResult => {
@@ -975,7 +969,7 @@ const providerErrorMessage = (event: Event, fallback: string): string => {
 const providerError = (state: ParserState, event: Event, fallback: string) => {
  const code = event.code || event.error?.code || event.response?.error?.code || undefined
  const message = providerErrorMessage(event, fallback)
-  return new LLMError({
+  return new AIError({
    module: state.id,
    method: "stream",
    reason: classifyProviderFailure({ message, code }),
@@ -6,11 +6,12 @@ import { Endpoint } from "../route/endpoint"
 import { HttpTransport } from "../route/transport"
 import { Protocol } from "../route/protocol"
 import {
-  LLMError,
+  AIError,
  LLMEvent,
  Usage,
  type FinishReason,
  type FinishReasonDetails,
+  type CacheHint,
  type JsonSchema,
  type LLMRequest,
  type MediaPart,
@@ -38,6 +39,11 @@ export const PATH = "/chat/completions"
 // The body schema is the provider-native JSON body. `fromRequest` below builds
 // this shape from the common `LLMRequest`, then `Route.make` validates and
 // JSON-encodes it before transport.
+const OpenAIChatCacheControl = Schema.Struct({
+  type: Schema.Literal("ephemeral"),
+  ttl: Schema.optional(Schema.String),
+})
+
 const OpenAIChatFunction = Schema.Struct({
  name: Schema.String,
  description: Schema.String,
@@ -47,6 +53,7 @@ const OpenAIChatFunction = Schema.Struct({
 const OpenAIChatTool = Schema.Struct({
  type: Schema.tag("function"),
  function: OpenAIChatFunction,
+  cache_control: Schema.optional(OpenAIChatCacheControl),
 })
 type OpenAIChatTool = Schema.Schema.Type<typeof OpenAIChatTool>

@@ -61,7 +68,11 @@ const OpenAIChatAssistantToolCall = Schema.Struct({
 type OpenAIChatAssistantToolCall = Schema.Schema.Type<typeof OpenAIChatAssistantToolCall>

 const OpenAIChatUserContent = Schema.Union([
-  Schema.Struct({ type: Schema.Literal("text"), text: Schema.String }),
+  Schema.Struct({
+    type: Schema.Literal("text"),
+    text: Schema.String,
+    cache_control: Schema.optional(OpenAIChatCacheControl),
+  }),
  Schema.Struct({
    type: Schema.Literal("image_url"),
    image_url: Schema.Struct({ url: Schema.String }),
@@ -69,7 +80,10 @@ const OpenAIChatUserContent = Schema.Union([
 ])

 const OpenAIChatMessage = Schema.Union([
-  Schema.Struct({ role: Schema.Literal("system"), content: Schema.String }),
+  Schema.Struct({
+    role: Schema.Literal("system"),
+    content: Schema.Union([Schema.String, Schema.Array(OpenAIChatUserContent)]),
+  }),
  Schema.Struct({
    role: Schema.Literal("user"),
    content: Schema.Union([Schema.String, Schema.Array(OpenAIChatUserContent)]),
@@ -83,10 +97,16 @@ const OpenAIChatMessage = Schema.Union([
      reasoning: Schema.optional(Schema.String),
      reasoning_text: Schema.optional(Schema.String),
      reasoning_details: Schema.optional(Schema.Unknown),
+      cache_control: Schema.optional(OpenAIChatCacheControl),
    }),
    [Schema.Record(Schema.String, Schema.Unknown)],
  ),
-  Schema.Struct({ role: Schema.Literal("tool"), tool_call_id: Schema.String, content: Schema.String }),
+  Schema.Struct({
+    role: Schema.Literal("tool"),
+    tool_call_id: Schema.String,
+    content: Schema.String,
+    cache_control: Schema.optional(OpenAIChatCacheControl),
+  }),
 ]).pipe(Schema.toTaggedUnion("role"))
 type OpenAIChatMessage = Schema.Schema.Type<typeof OpenAIChatMessage>

@@ -107,6 +127,7 @@ export const bodyFields = {
  stream_options: Schema.optional(Schema.Struct({ include_usage: Schema.Boolean })),
  store: Schema.optional(Schema.Boolean),
  reasoning_effort: Schema.optional(OpenAIOptions.OpenAIReasoningEffort),
+  max_completion_tokens: Schema.optional(Schema.Number),
  max_tokens: Schema.optional(Schema.Number),
  temperature: Schema.optional(Schema.Number),
  top_p: Schema.optional(Schema.Number),
@@ -209,13 +230,20 @@ export interface ParserState {
 // Lowering is the only place that knows how common LLM messages map onto the
 // OpenAI Chat wire format. Keep provider quirks here instead of leaking native
 // fields into `LLMRequest`.
-const lowerTool = (tool: ToolDefinition, inputSchema: JsonSchema): OpenAIChatTool => ({
+interface LoweringOptions {
+  readonly cacheControl?: (
+    cache: CacheHint | undefined,
+  ) => Schema.Schema.Type<typeof OpenAIChatCacheControl> | undefined
+}
+
+const lowerTool = (tool: ToolDefinition, inputSchema: JsonSchema, options: LoweringOptions): OpenAIChatTool => ({
  type: "function",
  function: {
    name: tool.name,
    description: tool.description,
    parameters: ToolSchemaProjection.openAI(inputSchema),
  },
+  cache_control: options.cacheControl?.(tool.cache),
 })

 const lowerToolChoice = (toolChoice: NonNullable<LLMRequest["toolChoice"]>) =>
@@ -257,11 +285,14 @@ const reasoningDetails = (parts: ReadonlyArray<ReasoningPart>, native: unknown)
  if (isRecord(native) && Array.isArray(native.reasoning_details)) return native.reasoning_details
 }

-const lowerUserMessage = Effect.fn("OpenAIChat.lowerUserMessage")(function* (message: OpenAIChatRequestMessage) {
+const lowerUserMessage = Effect.fn("OpenAIChat.lowerUserMessage")(function* (
+  message: OpenAIChatRequestMessage,
+  options: LoweringOptions,
+) {
  const content: Array<Schema.Schema.Type<typeof OpenAIChatUserContent>> = []
  for (const part of message.content) {
    if (part.type === "text") {
-      content.push({ type: "text", text: part.text })
+      content.push({ type: "text", text: part.text, cache_control: options.cacheControl?.(part.cache) })
      continue
    }
    if (part.type === "media") {
@@ -270,14 +301,18 @@ const lowerUserMessage = Effect.fn("OpenAIChat.lowerUserMessage")(function* (mes
    }
    return yield* ProviderShared.unsupportedContent("OpenAI Chat", "user", ["text", "media"])
  }
-  if (content.every((part) => part.type === "text"))
-    return { role: "user" as const, content: content.map((part) => part.text).join("") }
+  if (content.every((part) => part.type === "text" && part.cache_control === undefined))
+    return {
+      role: "user" as const,
+      content: content.map((part) => (part.type === "text" ? part.text : "")).join(""),
+    }
  return { role: "user" as const, content }
 })

 const lowerAssistantMessage = Effect.fn("OpenAIChat.lowerAssistantMessage")(function* (
  message: OpenAIChatRequestMessage,
  configuredField?: string,
+  options: LoweringOptions = {},
 ) {
  const content: TextPart[] = []
  const reasoning: ReasoningPart[] = []
@@ -315,29 +350,44 @@ const lowerAssistantMessage = Effect.fn("OpenAIChat.lowerAssistantMessage")(func
    if (reasoning.length === 0) return nativeReasoning
    return text
  })()
+  const cached = message.content.findLast((part) => "cache" in part && part.cache !== undefined)
  const result = {
    role: "assistant" as const,
    content: content.length === 0 ? null : ProviderShared.joinText(content),
    tool_calls: toolCalls.length === 0 ? undefined : toolCalls,
    reasoning_details: details,
+    cache_control: options.cacheControl?.(cached && "cache" in cached ? cached.cache : undefined),
  }
  if (field === undefined || reasoningText === undefined) return result
  return { ...result, [field]: reasoningText }
 })

-const lowerToolMessages = Effect.fn("OpenAIChat.lowerToolMessages")(function* (message: OpenAIChatRequestMessage) {
+const lowerToolMessages = Effect.fn("OpenAIChat.lowerToolMessages")(function* (
+  message: OpenAIChatRequestMessage,
+  options: LoweringOptions,
+) {
  const messages: OpenAIChatMessage[] = []
  const images: Array<Schema.Schema.Type<typeof OpenAIChatUserContent>> = []
  for (const part of message.content) {
    if (!ProviderShared.supportsContent(part, ["tool-result"]))
      return yield* ProviderShared.unsupportedContent("OpenAI Chat", "tool", ["tool-result"])
    if (part.result.type !== "content") {
-      messages.push({ role: "tool", tool_call_id: part.id, content: ProviderShared.toolResultText(part) })
+      messages.push({
+        role: "tool",
+        tool_call_id: part.id,
+        content: ProviderShared.toolResultText(part),
+        cache_control: options.cacheControl?.(part.cache),
+      })
      continue
    }
    const content: ReadonlyArray<Tool.Content> = part.result.value
    const text = content.filter((item) => item.type === "text").map((item) => item.text)
-    messages.push({ role: "tool", tool_call_id: part.id, content: text.join("\n") })
+    messages.push({
+      role: "tool",
+      tool_call_id: part.id,
+      content: text.join("\n"),
+      cache_control: options.cacheControl?.(part.cache),
+    })
    const files = content.filter((item) => item.type === "file")
    images.push(
      ...(yield* Effect.forEach(files, (item) =>
@@ -351,15 +401,29 @@ const lowerToolMessages = Effect.fn("OpenAIChat.lowerToolMessages")(function* (m
 const lowerMessage = Effect.fn("OpenAIChat.lowerMessage")(function* (
  message: OpenAIChatRequestMessage,
  reasoningField?: string,
+  options: LoweringOptions = {},
 ) {
-  if (message.role === "user") return [yield* lowerUserMessage(message)]
-  if (message.role === "assistant") return [yield* lowerAssistantMessage(message, reasoningField)]
-  return (yield* lowerToolMessages(message)).messages
+  if (message.role === "user") return [yield* lowerUserMessage(message, options)]
+  if (message.role === "assistant") return [yield* lowerAssistantMessage(message, reasoningField, options)]
+  return (yield* lowerToolMessages(message, options)).messages
 })

-const lowerMessages = Effect.fn("OpenAIChat.lowerMessages")(function* (request: LLMRequest) {
+const lowerMessages = Effect.fn("OpenAIChat.lowerMessages")(function* (request: LLMRequest, options: LoweringOptions) {
  const system: OpenAIChatMessage[] =
-    request.system.length === 0 ? [] : [{ role: "system", content: ProviderShared.joinText(request.system) }]
+    request.system.length === 0
+      ? []
+      : request.system.some((part) => part.cache !== undefined) && options.cacheControl !== undefined
+        ? [
+            {
+              role: "system",
+              content: request.system.map((part) => ({
+                type: "text",
+                text: part.text,
+                cache_control: options.cacheControl?.(part.cache),
+              })),
+            },
+          ]
+        : [{ role: "system", content: ProviderShared.joinText(request.system) }]
  const messages = [...system]
  const pendingImages: Array<Schema.Schema.Type<typeof OpenAIChatUserContent>> = []
  const flushImages = () => {
@@ -370,28 +434,53 @@ const lowerMessages = Effect.fn("OpenAIChat.lowerMessages")(function* (request:
    if (message.role === "system") {
      const part = yield* ProviderShared.wrappedSystemUpdate("OpenAI Chat", message)
      if (pendingImages.length > 0) {
-        messages.push({ role: "user", content: [...pendingImages.splice(0), { type: "text", text: part.text }] })
+        messages.push({
+          role: "user",
+          content: [
+            ...pendingImages.splice(0),
+            { type: "text", text: part.text, cache_control: options.cacheControl?.(part.cache) },
+          ],
+        })
        continue
      }
      const previous = messages.at(-1)
      if (previous?.role === "user" && typeof previous.content === "string")
-        messages[messages.length - 1] = { role: "user", content: `${previous.content}\n${part.text}` }
+        messages[messages.length - 1] = options.cacheControl?.(part.cache)
+          ? {
+              role: "user",
+              content: [
+                { type: "text", text: previous.content },
+                { type: "text", text: part.text, cache_control: options.cacheControl(part.cache) },
+              ],
+            }
+          : { role: "user", content: `${previous.content}\n${part.text}` }
      else if (previous?.role === "user" && Array.isArray(previous.content))
        messages[messages.length - 1] = {
          role: "user",
-          content: [...previous.content, { type: "text", text: part.text }],
+          content: [
+            ...previous.content,
+            { type: "text", text: part.text, cache_control: options.cacheControl?.(part.cache) },
+          ],
        }
-      else messages.push({ role: "user", content: part.text })
+      else
+        messages.push(
+          options.cacheControl?.(part.cache)
+            ? {
+                role: "user",
+                content: [{ type: "text", text: part.text, cache_control: options.cacheControl(part.cache) }],
+              }
+            : { role: "user", content: part.text },
+        )
      continue
    }
    if (message.role === "tool") {
-      const lowered = yield* lowerToolMessages(message)
+      const lowered = yield* lowerToolMessages(message, options)
      messages.push(...lowered.messages)
      pendingImages.push(...lowered.images)
      continue
    }
    flushImages()
-    messages.push(...(yield* lowerMessage(message, request.model.compatibility?.reasoningField)))
+    messages.push(...(yield* lowerMessage(message, request.model.compatibility?.reasoningField, options)))
  }
  flushImages()
  return messages
@@ -405,7 +494,10 @@ const lowerOptions = (request: LLMRequest) => {
  }
 }

-const fromRequest = Effect.fn("OpenAIChat.fromRequest")(function* (request: LLMRequest) {
+export const fromRequest = Effect.fn("OpenAIChat.fromRequest")(function* (
+  request: LLMRequest,
+  options: LoweringOptions = {},
+) {
  // `fromRequest` returns the provider body only. Endpoint, auth, framing,
  // validation, and HTTP execution are composed by `Route.make`.
  const reasoningField = request.model.compatibility?.reasoningField
@@ -415,19 +507,26 @@ const fromRequest = Effect.fn("OpenAIChat.fromRequest")(function* (request: LLMR
    )
  const generation = request.generation
  const toolSchemaCompatibility = request.model.compatibility?.toolSchema
+  const maxTokensField = request.model.compatibility?.maxTokensField ?? "max_tokens"
  return {
    model: request.model.id,
-    messages: yield* lowerMessages(request),
+    messages: yield* lowerMessages(request, options),
    tools:
      request.tools.length === 0
        ? undefined
        : request.tools.map((tool) =>
-            lowerTool(tool, ToolSchemaProjection.modelCompatibility(tool.inputSchema, toolSchemaCompatibility)),
+            lowerTool(
+              tool,
+              ToolSchemaProjection.modelCompatibility(tool.inputSchema, toolSchemaCompatibility),
+              options,
+            ),
          ),
    tool_choice: request.toolChoice ? yield* lowerToolChoice(request.toolChoice) : undefined,
    stream: true as const,
    stream_options: { include_usage: true },
-    max_tokens: generation?.maxTokens,
+    ...(maxTokensField === "max_completion_tokens"
+      ? { max_completion_tokens: generation?.maxTokens }
+      : { max_tokens: generation?.maxTokens }),
    temperature: generation?.temperature,
    top_p: generation?.topP,
    frequency_penalty: generation?.frequencyPenalty,
@@ -456,7 +555,7 @@ const mapFinishReason = (reason: string | null | undefined): FinishReason => {
 // OpenAI Chat reports `prompt_tokens` (inclusive total) with a
 // cached-read and cache-write subsets, and `completion_tokens` (inclusive
 // total) with a `reasoning_tokens` subset. We pass the inclusive totals
-// through and derive the non-cached breakdown so the `LLM.Usage` contract is
+// through and derive the non-cached breakdown so the `AI.Usage` contract is
 // satisfied on both sides.
 const mapUsage = (usage: OpenAIChatEvent["usage"]): Usage | undefined => {
  if (!usage) return undefined
@@ -546,7 +645,7 @@ const reasoningMetadata = (field: ParserState["reasoningField"], details?: Reado
 const step = (state: ParserState, event: OpenAIChatEvent) =>
  Effect.gen(function* () {
    if (event.error)
-      return yield* new LLMError({
+      return yield* new AIError({
        module: ADAPTER,
        method: "stream",
        reason: classifyProviderFailure({
@@ -1,11 +1,11 @@
-import { Route, type RouteRoutedModelInput } from "../route/client"
+import { Route, type RouteRoutedLanguageModelInput } from "../route/client"
 import { Endpoint } from "../route/endpoint"
 import { Framing } from "../route/framing"
 import * as OpenAIChat from "./openai-chat"

 const ADAPTER = "openai-compatible-chat"

-export type OpenAICompatibleChatModelInput = RouteRoutedModelInput
+export type OpenAICompatibleChatLanguageModelInput = RouteRoutedLanguageModelInput

 /**
 * Route for non-OpenAI providers that expose an OpenAI Chat-compatible
@@ -1,10 +1,10 @@
-import { Route, type RouteRoutedModelInput } from "../route/client"
+import { Route, type RouteRoutedLanguageModelInput } from "../route/client"
 import { Endpoint } from "../route/endpoint"
 import { OpenResponses } from "./open-responses"

 const ADAPTER = "openai-compatible-responses"

-export type OpenAICompatibleResponsesModelInput = RouteRoutedModelInput
+export type OpenAICompatibleResponsesLanguageModelInput = RouteRoutedLanguageModelInput

 /**
 * Deployment adapter for providers that expose an Open Responses-compatible
@@ -11,7 +11,7 @@ import {
 import { Auth, type Definition as AuthDefinition } from "../route/auth"
 import {
  InvalidProviderOutputReason,
-  LLMError,
+  AIError,
  Usage,
  mergeHttpOptions,
  mergeJsonRecords,
@@ -85,7 +85,7 @@ const nativeOptions = (options: OpenAIImageOptions | undefined) => {
 }

 const invalidOutput = (message: string) =>
-  new LLMError({
+  new AIError({
    module: ADAPTER,
    method: "generate",
    reason: new InvalidProviderOutputReason({ message, route: ADAPTER }),
@@ -6,7 +6,7 @@ import { Headers, HttpClientRequest } from "effect/unstable/http"
 import {
  InvalidProviderOutputReason,
  InvalidRequestReason,
-  LLMError,
+  AIError,
  type ContentPart,
  type LLMRequest,
  type MediaPart,
@@ -41,7 +41,7 @@ export interface ToolAccumulator {
 * when at least one is defined. Returns `undefined` when neither input nor
 * output is known so routes don't publish a misleading `0`.
 *
- * Under the additive `LLM.Usage` contract, `inputTokens` and `outputTokens`
+ * Under the additive `AI.Usage` contract, `inputTokens` and `outputTokens`
 * are the non-cached input and visible output only. The provider-supplied
 * `total` is the source of truth when present; the computed fallback
 * under-counts cache and reasoning by design and exists mainly so
@@ -88,7 +88,7 @@ export const sumTokens = (...values: ReadonlyArray<number | undefined>): number
 }

 export const eventError = (route: string, message: string, raw?: string) =>
-  new LLMError({
+  new AIError({
    module: "ProviderShared",
    method: "stream",
    reason: new InvalidProviderOutputReason({ route, message, raw }),
@@ -238,9 +238,9 @@ export const errorText = (error: unknown) => {
 * `decodeChunk` sees one JSON string per element. The SSE channel emits a
 * `Retry` control event on its error channel; we drop it here (we don't
 * implement client-driven retries) so the public error channel stays
- * `LLMError`.
+ * `AIError`.
 */
-export const sseFraming = (bytes: Stream.Stream<Uint8Array, LLMError>): Stream.Stream<string, LLMError> =>
+export const sseFraming = (bytes: Stream.Stream<Uint8Array, AIError>): Stream.Stream<string, AIError> =>
  bytes.pipe(
    Stream.decodeText(),
    Stream.pipeThroughChannel(Sse.decode()),
@@ -257,7 +257,7 @@ export const sseFraming = (bytes: Stream.Stream<Uint8Array, LLMError>): Stream.S
 * lands here.
 */
 export const invalidRequest = (message: string) =>
-  new LLMError({
+  new AIError({
    module: "ProviderShared",
    method: "request",
    reason: new InvalidRequestReason({ message }),
@@ -304,7 +304,7 @@ export const unsupportedContent = (
 * Build a `validate` step from a Schema decoder. Replaces the per-route
 * lambda body `(payload) => decode(payload).pipe(Effect.mapError((e) =>
 * invalid(e.message)))`. Any decode error is translated into
- * `LLMError` carrying the original parse-error message.
+ * `AIError` carrying the original parse-error message.
 */
 export const validateWith =
  <A, I, E extends { readonly message: string }>(decode: (input: I) => Effect.Effect<A, E>) =>
@@ -1,9 +1,9 @@
 import { Effect, Encoding } from "effect"
 import type { ImageInput } from "../../image"
-import { InvalidRequestReason, LLMError } from "../../schema"
+import { InvalidRequestReason, AIError } from "../../schema"

 const invalid = (module: string, message: string) =>
-  new LLMError({
+  new AIError({
    module,
    method: "generate",
    reason: new InvalidRequestReason({ message }),
@@ -15,7 +15,7 @@ export const dataUrl = (input: Extract<ImageInput, { readonly type: "bytes" }>)
 export const decodeDataUrl = (
  url: string,
  module: string,
-): Effect.Effect<{ readonly mediaType: string; readonly data: Uint8Array } | undefined, LLMError> => {
+): Effect.Effect<{ readonly mediaType: string; readonly data: Uint8Array } | undefined, AIError> => {
  if (!url.startsWith("data:")) return Effect.succeed(undefined)
  const match = /^data:([^;,]+);base64,(.*)$/s.exec(url)
  if (!match) return Effect.fail(invalid(module, "Image data URLs must contain a MIME type and base64 data"))
@@ -1,4 +1,4 @@
-import type { JsonSchema, ModelToolSchemaCompatibility } from "../../schema"
+import type { JsonSchema, LanguageModelToolSchemaCompatibility } from "../../schema"
 import { isRecord } from "../../utils/record"
 import { GeminiToolSchema } from "./gemini-tool-schema"

@@ -69,7 +69,7 @@ const gemini = (schema: JsonSchema): JsonSchema => GeminiToolSchema.convert(sche

 const modelCompatibility = (
  schema: JsonSchema,
-  compatibility: ModelToolSchemaCompatibility | undefined,
+  compatibility: LanguageModelToolSchemaCompatibility | undefined,
 ): JsonSchema => {
  if (compatibility === undefined) return schema
  switch (compatibility) {
@@ -1,5 +1,5 @@
 import { Effect } from "effect"
-import { LLMError, LLMEvent, type ProviderMetadata, type ToolCall, type ToolInputError } from "../../schema"
+import { AIError, LLMEvent, type ProviderMetadata, type ToolCall, type ToolInputError } from "../../schema"
 import { eventError, parseToolInput, type ToolAccumulator } from "../shared"

 type StreamKey = string | number
@@ -112,8 +112,8 @@ const appendTool = <K extends StreamKey>(
  }
 }

-export const isError = <K extends StreamKey>(result: AppendOutcome<K> | LLMError): result is LLMError =>
-  result instanceof LLMError
+export const isError = <K extends StreamKey>(result: AppendOutcome<K> | AIError): result is AIError =>
+  result instanceof AIError

 /**
 * Register a tool call whose start event arrived before any argument deltas.
@@ -138,7 +138,7 @@ export const appendOrStart = <K extends StreamKey>(
  key: K,
  delta: { readonly id?: string; readonly name?: string; readonly text: string },
  missingToolMessage: string,
-): AppendOutcome<K> | LLMError => {
+): AppendOutcome<K> | AIError => {
  const current = tools[key]
  const id = current?.id ?? delta.id
  const name = current?.name ?? delta.name
@@ -167,7 +167,7 @@ export const appendExisting = <K extends StreamKey>(
  key: K,
  text: string,
  missingToolMessage: string,
-): AppendOutcome<K> | LLMError => {
+): AppendOutcome<K> | AIError => {
  const current = tools[key]
  if (!current) return eventError(route, missingToolMessage)
  if (text.length === 0) return { tools, tool: current, events: [] }
@@ -4,7 +4,7 @@ import { GeneratedImage, ImageModel, ImageResponse, type ImageRequestFor, type I
 import { Auth, type Definition as AuthDefinition } from "../route/auth"
 import {
  InvalidProviderOutputReason,
-  LLMError,
+  AIError,
  Usage,
  mergeHttpOptions,
  mergeJsonRecords,
@@ -95,7 +95,7 @@ const nativeOptions = (options: XAIImageOptions | undefined) => {
 }

 const invalidOutput = (message: string) =>
-  new LLMError({
+  new AIError({
    module: ADAPTER,
    method: "generate",
    reason: new InvalidProviderOutputReason({ message, route: ADAPTER }),
@@ -2,7 +2,7 @@ import { Effect, Schema } from "effect"
 import { Headers, HttpClientRequest } from "effect/unstable/http"
 import { GeneratedImage, ImageModel, ImageResponse, type ImageRequestFor, type ImageRoute } from "../image"
 import { Auth, type Definition as AuthDefinition } from "../route/auth"
-import { InvalidProviderOutputReason, LLMError, mergeHttpOptions, mergeJsonRecords, type HttpOptions } from "../schema"
+import { InvalidProviderOutputReason, AIError, mergeHttpOptions, mergeJsonRecords, type HttpOptions } from "../schema"
 import { ProviderShared } from "./shared"
 import { ImageInputs } from "./utils/image-input"

@@ -58,7 +58,7 @@ const nativeOptions = (options: ZAIImageOptions | undefined) => {
 }

 const invalidOutput = (message: string) =>
-  new LLMError({
+  new AIError({
    module: ADAPTER,
    method: "generate",
    reason: new InvalidProviderOutputReason({ message, route: ADAPTER }),
@@ -3,7 +3,7 @@ import {
  AuthenticationReason,
  ContentPolicyReason,
  InvalidRequestReason,
-  LLMError,
+  AIError,
  ProviderErrorEvent,
  ProviderInternalReason,
  QuotaExceededReason,
@@ -16,7 +16,6 @@ import {

 const patterns = [
  /prompt is too long/i,
-  /request_too_large/i,
  /input is too long for requested model/i,
  /exceeds the context window/i,
  /exceeds (?:the )?(?:model'?s )?maximum context length(?: of [\d,]+ tokens?|\s*\([\d,]+\))/i,
@@ -33,7 +32,6 @@ const patterns = [
  /context window exceeds limit/i,
  /exceeded model token limit/i,
  /context[_ ]length[_ ]exceeded/i,
-  /request entity too large/i,
  /context length is only \d+ tokens/i,
  /input length.*exceeds.*context length/i,
  /prompt too long; exceeded (?:max )?context length/i,
@@ -44,14 +42,18 @@ const patterns = [
  /token limit exceeded/i,
 ]

+const payloadPatterns = [/request_too_large/i, /request entity too large/i, /payload too large/i, /request too large/i]
+
 const exclusions = [/^(throttling error|service unavailable):/i, /rate limit/i, /too many requests/i]

 export const isContextOverflow = (message: string) =>
  !exclusions.some((pattern) => pattern.test(message)) &&
-  (patterns.some((pattern) => pattern.test(message)) || /^4(00|13)\s*(status code)?\s*\(no body\)/i.test(message))
+  (patterns.some((pattern) => pattern.test(message)) || /^400\s*(status code)?\s*\(no body\)/i.test(message))
+
+export const isPayloadTooLarge = (message: string) => payloadPatterns.some((pattern) => pattern.test(message))

 export const isContextOverflowFailure = (failure: unknown) =>
-  failure instanceof LLMError
+  failure instanceof AIError
    ? failure.reason._tag === "InvalidRequest" && failure.reason.classification === "context-overflow"
    : Schema.is(ProviderErrorEvent)(failure) && failure.classification === "context-overflow"

@@ -84,7 +86,7 @@ export interface ProviderFailure {

 // Keep HTTP failures and provider-reported stream failures on one typed path so
 // session retry policy never needs provider-specific string matching.
-export function classifyProviderFailure(input: ProviderFailure): LLMError["reason"] {
+export function classifyProviderFailure(input: ProviderFailure): AIError["reason"] {
  const body = input.http?.body ?? ""
  const codes = [input.code, ...providerCodes(body), ...providerCodes(input.message)]
    .filter((code): code is string => code !== undefined)
@@ -100,6 +102,8 @@ export function classifyProviderFailure(input: ProviderFailure): LLMError["reaso
      isContextOverflow(text))
  )
    return new InvalidRequestReason({ ...common, classification: "context-overflow" })
+  if (input.status === 413 || isPayloadTooLarge(text))
+    return new InvalidRequestReason({ ...common, classification: "payload-too-large" })
  if (CONTENT_POLICY_TEXT.test(text)) return new ContentPolicyReason(common)
  if (codes.some((code) => QUOTA_CODES.has(code)) || (input.status === 429 && QUOTA_TEXT.test(text)))
    return new QuotaExceededReason(common)
@@ -142,12 +146,7 @@ export function classifyProviderFailure(input: ProviderFailure): LLMError["reaso
      retryAfterMs: input.retryAfterMs,
    })
  if (codes.some((code) => INVALID_REQUEST_CODES.has(code))) return new InvalidRequestReason(common)
-  if (
-    input.status === 400 ||
-    input.status === 404 ||
-    input.status === 413 ||
-    input.status === 422
-  )
+  if (input.status === 400 || input.status === 404 || input.status === 413 || input.status === 422)
    return new InvalidRequestReason(common)
  return new UnknownProviderReason({ ...common, status: input.status })
 }
@@ -1,10 +1,12 @@
-import type { Model, ProviderOptions } from "./schema"
+import type { LanguageModel, ProviderOptions } from "./schema"

 export interface Settings extends Readonly<Record<string, unknown>> {
+  readonly baseURL?: string
  readonly headers?: Readonly<Record<string, string>>
  readonly body?: Readonly<Record<string, unknown>>
  readonly limits?: {
    readonly context: number
+    readonly input?: number
    readonly output: number
  }
 }
@@ -13,7 +15,7 @@ export interface Definition<
  ProviderSettings extends Settings = Settings,
  Options extends ProviderOptions = ProviderOptions,
 > {
-  readonly model: (modelID: string, settings: ProviderSettings) => Model<Options>
+  readonly model: (modelID: string, settings: ProviderSettings) => LanguageModel<Options>
 }

 export * as ProviderPackage from "./provider-package"
@@ -1,6 +1,6 @@
-import type { Model, ModelID, ProviderID } from "./schema"
+import type { LanguageModel, ModelID, ProviderID } from "./schema"

-export type ModelOptions = Pick<Model.Input, "defaults" | "compatibility">
+export type LanguageModelOptions = Pick<LanguageModel.Input, "defaults" | "compatibility">

 /**
 * Advanced structural provider definition helper. Built-in providers should
@@ -8,23 +8,23 @@ export type ModelOptions = Pick<Model.Input, "defaults" | "compatibility">
 * chosen before model selection. The optional `apis` map remains for external
 * structural providers that expose multiple route selectors behind one provider.
 */
-export type ModelFactory<Options extends ModelOptions = ModelOptions> = (
+export type LanguageModelFactory<Options extends LanguageModelOptions = LanguageModelOptions> = (
  id: string | ModelID,
  options?: Options,
-) => Model
+) => LanguageModel

-type AnyModelFactory = (...args: never[]) => Model
+type AnyLanguageModelFactory = (...args: never[]) => LanguageModel

-export interface Definition<Factory extends AnyModelFactory = ModelFactory> {
+export interface Definition<Factory extends AnyLanguageModelFactory = LanguageModelFactory> {
  readonly id: ProviderID
  readonly model: Factory
-  readonly apis?: Record<string, AnyModelFactory>
+  readonly apis?: Record<string, AnyLanguageModelFactory>
 }

 type DefinitionShape = {
  readonly id: ProviderID
-  readonly model: (...args: never[]) => Model
-  readonly apis?: Record<string, (...args: never[]) => Model>
+  readonly model: (...args: never[]) => LanguageModel
+  readonly apis?: Record<string, (...args: never[]) => LanguageModel>
 }

 type NoExtraFields<Input, Shape> = Input & Record<Exclude<keyof Input, keyof Shape>, never>
@@ -14,7 +14,7 @@ const routeAuth = Auth.remove("authorization")
 // (helper builds the URL) or `baseURL` directly.
 type AzureURL = AtLeastOne<{ readonly resourceName: string; readonly baseURL: string }>

-export type ModelOptions = AzureURL &
+export type LanguageModelOptions = AzureURL &
  RouteDefaultsInput &
  ProviderAuthOption<"optional"> & {
    readonly apiVersion?: string
@@ -22,7 +22,7 @@ export type ModelOptions = AzureURL &
    readonly useCompletionUrls?: boolean
    readonly providerOptions?: OpenAIProviderOptionsInput
  }
-export type Config = ModelOptions
+export type Config = LanguageModelOptions

 export type Settings = ProviderPackage.Settings &
  AzureURL & {
@@ -9,14 +9,14 @@ export const id = ProviderID.make("github-copilot")

 // GitHub Copilot has no canonical public URL — callers (opencode, etc.) must
 // supply `baseURL` explicitly.
-export type ModelOptions = Omit<RouteDefaultsInput, "providerOptions"> &
+export type LanguageModelOptions = Omit<RouteDefaultsInput, "providerOptions"> &
  ProviderAuthOption<"optional"> & {
    readonly baseURL: string
    readonly endpoint?: "chat" | "responses"
    readonly providerOptions?: OpenAIProviderOptionsInput
  }

-export const shouldUseResponsesApi = (modelID: string | ModelID, endpoint?: ModelOptions["endpoint"]) => {
+export const shouldUseResponsesApi = (modelID: string | ModelID, endpoint?: LanguageModelOptions["endpoint"]) => {
  if (endpoint) return endpoint === "responses"
  const model = String(modelID)
  const match = /^gpt-(\d+)/.exec(model)
@@ -29,24 +29,24 @@ export const routes = [OpenAIResponses.route, OpenAIChat.route]
 const chatRoute = OpenAIChat.route.with({ provider: id })
 const responsesRoute = OpenAIResponses.route.with({ provider: id })

-const defaults = (options: ModelOptions) => {
+const defaults = (options: LanguageModelOptions) => {
  const { apiKey: _, auth: _auth, baseURL: _baseURL, endpoint: _endpoint, ...rest } = options
  return rest
 }

-const configuredResponsesRoute = (options: ModelOptions) =>
+const configuredResponsesRoute = (options: LanguageModelOptions) =>
  responsesRoute.with({
    endpoint: { baseURL: options.baseURL },
    auth: AuthOptions.bearer(options, []),
  })

-const configuredChatRoute = (options: ModelOptions) =>
+const configuredChatRoute = (options: LanguageModelOptions) =>
  chatRoute.with({
    endpoint: { baseURL: options.baseURL },
    auth: AuthOptions.bearer(options, []),
  })

-export const configure = (options: ModelOptions) => {
+export const configure = (options: LanguageModelOptions) => {
  const responsesRoute = configuredResponsesRoute(options)
  const chatRoute = configuredChatRoute(options)
  const responses = (modelID: string | ModelID) =>
@@ -4,32 +4,90 @@ import { Endpoint } from "../route/endpoint"
 import { Framing } from "../route/framing"
 import { Protocol } from "../route/protocol"
 import { AuthOptions, type ProviderAuthOption } from "../route/auth-options"
-import { ProviderID, type ModelID, type ProviderOptions } from "../schema"
+import { ProviderID, type CacheHint, type ModelID, type ProviderOptions } from "../schema"
+import type { ProviderPackage } from "../provider-package"
 import * as OpenAICompatibleProfiles from "./openai-compatible-profile"
 import * as OpenAIChat from "../protocols/openai-chat"
+import { newBreakpoints, ttlBucket } from "../protocols/utils/cache"
 import { isRecord } from "../protocols/shared"

 export const profile = OpenAICompatibleProfiles.profiles.openrouter
 export const id = ProviderID.make(profile.provider)
 const ADAPTER = "openrouter"

+type OpenRouterString<Known extends string> = Known | (string & {})
+
+export interface OpenRouterProviderRouting {
+  readonly [key: string]: unknown
+  readonly order?: ReadonlyArray<string>
+  readonly allow_fallbacks?: boolean
+  readonly require_parameters?: boolean
+  readonly data_collection?: OpenRouterString<"allow" | "deny">
+  readonly only?: ReadonlyArray<string>
+  readonly ignore?: ReadonlyArray<string>
+  readonly quantizations?: ReadonlyArray<string>
+  readonly sort?: OpenRouterString<"price" | "throughput" | "latency">
+  readonly max_price?: Readonly<{
+    prompt?: number | string
+    completion?: number | string
+    image?: number | string
+    audio?: number | string
+    request?: number | string
+  }>
+  readonly zdr?: boolean
+}
+
+export type OpenRouterPlugin =
+  | Readonly<{
+      id: "web"
+      max_results?: number
+      search_prompt?: string
+      engine?: OpenRouterString<"native" | "exa">
+    }>
+  | Readonly<{ id: "file-parser"; max_files?: number; pdf?: { engine?: string } }>
+  | Readonly<{ id: "moderation" }>
+  | Readonly<{ id: "response-healing" }>
+  | Readonly<{ id: "auto-router"; allowed_models?: ReadonlyArray<string> }>
+  | Readonly<{ id: string & {}; [key: string]: unknown }>
+
 export interface OpenRouterOptions {
  readonly [key: string]: unknown
-  readonly usage?: boolean | Record<string, unknown>
-  readonly reasoning?: Record<string, unknown>
+  readonly debug?: Readonly<{ echo_upstream_body?: boolean }>
+  readonly models?: ReadonlyArray<string>
+  readonly plugins?: ReadonlyArray<OpenRouterPlugin>
  readonly promptCacheKey?: string
+  readonly provider?: OpenRouterProviderRouting
+  readonly reasoning?: Readonly<{
+    enabled?: boolean
+    exclude?: boolean
+    effort?: OpenRouterString<"none" | "minimal" | "low" | "medium" | "high" | "xhigh" | "max">
+    max_tokens?: number
+  }>
+  readonly usage?: boolean | Readonly<{ include: boolean }>
+  readonly user?: string
+  readonly web_search_options?: Readonly<{
+    max_results?: number
+    search_prompt?: string
+    engine?: OpenRouterString<"native" | "exa">
+  }>
 }

 export type OpenRouterProviderOptionsInput = ProviderOptions & {
  readonly openrouter?: OpenRouterOptions
 }

-export type ModelOptions = Omit<RouteDefaultsInput, "providerOptions"> &
+export type LanguageModelOptions = Omit<RouteDefaultsInput, "providerOptions"> &
  ProviderAuthOption<"optional"> & {
    readonly baseURL?: string
    readonly providerOptions?: OpenRouterProviderOptionsInput
  }

+export interface Settings extends ProviderPackage.Settings {
+  readonly apiKey?: string
+  readonly baseURL?: string
+  readonly providerOptions?: OpenRouterProviderOptionsInput
+}
+
 const OpenRouterBody = Schema.StructWithRest(Schema.Struct(OpenAIChat.bodyFields), [
  Schema.Record(Schema.String, Schema.Any),
 ])
@@ -40,7 +98,7 @@ export const protocol = Protocol.make({
  body: {
    schema: OpenRouterBody,
    from: (request) =>
-      OpenAIChat.protocol.body.from(request).pipe(
+      OpenAIChat.fromRequest(request, { cacheControl: cacheControl() }).pipe(
        Effect.map((body) => {
          const sourceAssistants = request.messages.filter((message) => message.role === "assistant")
          let assistantIndex = 0
@@ -71,16 +129,39 @@ export const protocol = Protocol.make({
  stream: OpenAIChat.protocol.stream,
 })

+const cacheControl = () => {
+  const breakpoints = newBreakpoints(4)
+  return (cache: CacheHint | undefined) => {
+    if (cache === undefined || breakpoints.remaining === 0) return undefined
+    breakpoints.remaining -= 1
+    return {
+      type: "ephemeral" as const,
+      ...(ttlBucket(cache.ttlSeconds) === "1h" ? { ttl: "1h" } : {}),
+    }
+  }
+}
+
 const bodyOptions = (input: unknown) => {
  const openrouter = isRecord(input) ? input : {}
+  const { usage, models, provider, plugins, web_search_options, debug, user, reasoning, promptCacheKey, ...options } =
+    openrouter
  return {
-    ...(openrouter.usage === true
+    ...options,
+    ...(usage === undefined || usage === true
      ? { usage: { include: true } }
-      : isRecord(openrouter.usage)
-        ? { usage: openrouter.usage }
-        : {}),
-    ...(isRecord(openrouter.reasoning) ? { reasoning: openrouter.reasoning } : {}),
-    ...(typeof openrouter.promptCacheKey === "string" ? { prompt_cache_key: openrouter.promptCacheKey } : {}),
+      : usage === false
+        ? { usage: { include: false } }
+        : isRecord(usage)
+          ? { usage }
+          : {}),
+    ...(Array.isArray(models) ? { models } : {}),
+    ...(isRecord(provider) ? { provider } : {}),
+    ...(Array.isArray(plugins) ? { plugins } : {}),
+    ...(isRecord(web_search_options) ? { web_search_options } : {}),
+    ...(isRecord(debug) ? { debug } : {}),
+    ...(typeof user === "string" ? { user } : {}),
+    ...(isRecord(reasoning) ? { reasoning } : {}),
+    ...(typeof promptCacheKey === "string" ? { prompt_cache_key: promptCacheKey } : {}),
  }
 }

@@ -94,7 +175,7 @@ export const route = Route.make({

 export const routes = [route]

-const configuredRoute = (input: ModelOptions) => {
+const configuredRoute = (input: LanguageModelOptions) => {
  const { apiKey: _, auth: _auth, baseURL, ...rest } = input
  return route.with({
    ...rest,
@@ -103,7 +184,7 @@ const configuredRoute = (input: ModelOptions) => {
  })
 }

-export const configure = (input: ModelOptions = {}) => {
+export const configure = (input: LanguageModelOptions = {}) => {
  const route = configuredRoute(input)
  return {
    id,
@@ -113,4 +194,15 @@ export const configure = (input: ModelOptions = {}) => {
 }

 export const provider = configure()
-export const model = provider.model
+export const model: ProviderPackage.Definition<Settings, OpenRouterProviderOptionsInput>["model"] = (
+  modelID,
+  settings,
+) =>
+  configure({
+    apiKey: settings.apiKey,
+    baseURL: settings.baseURL,
+    headers: settings.headers,
+    http: settings.body === undefined ? undefined : { body: { ...settings.body } },
+    limits: settings.limits,
+    providerOptions: settings.providerOptions,
+  }).model(modelID)
@@ -1,51 +1,81 @@
 import { AuthOptions, type ProviderAuthOption } from "../route/auth-options"
-import type { RouteDefaultsInput } from "../route/client"
-import { HttpOptions, ProviderID, type ModelID } from "../schema"
+import { Route, type RouteDefaultsInput } from "../route/client"
+import { Endpoint } from "../route/endpoint"
+import { HttpOptions, ProviderID, type ModelID, type ProviderOptions } from "../schema"
 import * as OpenAICompatibleProfiles from "./openai-compatible-profile"
 import * as OpenAICompatibleChat from "../protocols/openai-compatible-chat"
+import * as OpenAIChat from "../protocols/openai-chat"
 import * as OpenAIResponses from "../protocols/openai-responses"
 import { XAIImages } from "../protocols/xai-images"
-import type { OpenAIProviderOptionsInput } from "./openai-options"
+import type { OpenAIOptionsInput } from "./openai-options"
+import type { ProviderPackage } from "../provider-package"

 export const id = ProviderID.make("xai")

-export type ModelOptions = Omit<RouteDefaultsInput, "providerOptions"> &
+export type XAIProviderOptionsInput = ProviderOptions & {
+  readonly xai?: OpenAIOptionsInput
+}
+
+export type LanguageModelOptions = Omit<RouteDefaultsInput, "providerOptions"> &
  ProviderAuthOption<"optional"> & {
    readonly baseURL?: string
-    readonly providerOptions?: OpenAIProviderOptionsInput
+    readonly providerOptions?: XAIProviderOptionsInput
  }

+export interface Settings extends ProviderPackage.Settings {
+  readonly apiKey?: string
+  readonly baseURL?: string
+  readonly providerOptions?: XAIProviderOptionsInput
+}
+
 export type { XAIImageOptions } from "../protocols/xai-images"

-export const routes = [OpenAIResponses.route, OpenAICompatibleChat.route]
+const responsesRoute = Route.make({
+  id: "openai-responses",
+  provider: id,
+  providerMetadataKey: "xai",
+  protocol: OpenAIResponses.protocol,
+  endpoint: Endpoint.path("/responses", { baseURL: OpenAICompatibleProfiles.profiles.xai.baseURL }),
+  transport: OpenAIResponses.httpTransport,
+  defaults: { providerOptions: { xai: { store: false } } },
+})
+
+const chatRoute = Route.make({
+  id: "openai-compatible-chat",
+  provider: id,
+  providerMetadataKey: "xai",
+  protocol: OpenAIChat.protocol,
+  endpoint: Endpoint.path("/chat/completions", { baseURL: OpenAICompatibleProfiles.profiles.xai.baseURL }),
+  transport: OpenAICompatibleChat.route.transport,
+})
+
+export const routes = [responsesRoute, chatRoute]

 const auth = (options: ProviderAuthOption<"optional">) => AuthOptions.bearer(options, "XAI_API_KEY")

-const configuredResponsesRoute = (input: ModelOptions) => {
+const configuredResponsesRoute = (input: LanguageModelOptions) => {
  const { apiKey: _, auth: _auth, baseURL, ...rest } = input
-  return OpenAIResponses.route.with({
+  return responsesRoute.with({
    ...rest,
-    provider: id,
    endpoint: { baseURL: baseURL ?? OpenAICompatibleProfiles.profiles.xai.baseURL },
    auth: auth(input),
  })
 }

-const configuredChatRoute = (input: ModelOptions) => {
+const configuredChatRoute = (input: LanguageModelOptions) => {
  const { apiKey: _, auth: _auth, baseURL, ...rest } = input
-  return OpenAICompatibleChat.route.with({
+  return chatRoute.with({
    ...rest,
-    provider: id,
    endpoint: { baseURL: baseURL ?? OpenAICompatibleProfiles.profiles.xai.baseURL },
    auth: auth(input),
  })
 }

-export const configure = (input: ModelOptions = {}) => {
+export const configure = (input: LanguageModelOptions = {}) => {
  const responsesRoute = configuredResponsesRoute(input)
  const chatRoute = configuredChatRoute(input)
-  const responses = (modelID: string | ModelID) => responsesRoute.model<OpenAIProviderOptionsInput>({ id: modelID })
-  const chat = (modelID: string | ModelID) => chatRoute.model<OpenAIProviderOptionsInput>({ id: modelID })
+  const responses = (modelID: string | ModelID) => responsesRoute.model<XAIProviderOptionsInput>({ id: modelID })
+  const chat = (modelID: string | ModelID) => chatRoute.model<XAIProviderOptionsInput>({ id: modelID })
  const image = (modelID: string | ModelID) =>
    XAIImages.model({
      id: modelID,
@@ -65,7 +95,15 @@ export const configure = (input: ModelOptions = {}) => {
 }

 export const provider = configure()
-export const model = provider.model
+export const model: ProviderPackage.Definition<Settings, XAIProviderOptionsInput>["model"] = (modelID, settings) =>
+  configure({
+    apiKey: settings.apiKey,
+    baseURL: settings.baseURL,
+    headers: settings.headers,
+    http: settings.body === undefined ? undefined : { body: { ...settings.body } },
+    limits: settings.limits,
+    providerOptions: settings.providerOptions,
+  }).model(modelID)
 export const responses = provider.responses
 export const chat = provider.chat
 export const image = provider.image
@@ -22,13 +22,17 @@ export type ProviderAuthOption<Mode extends ApiKeyMode> =
  | AuthOverride
  | (Mode extends "optional" ? OptionalApiKeyAuth : RequiredApiKeyAuth)

-export type ModelOptions<Base, Mode extends ApiKeyMode> = Omit<Base, "apiKey" | "auth"> & ProviderAuthOption<Mode>
+export type LanguageModelOptions<Base, Mode extends ApiKeyMode> = Omit<Base, "apiKey" | "auth"> &
+  ProviderAuthOption<Mode>

-export type ModelArgs<Base, Mode extends ApiKeyMode> = Mode extends "optional"
-  ? readonly [options?: ModelOptions<Base, Mode>]
-  : readonly [options: ModelOptions<Base, Mode>]
+export type LanguageModelArgs<Base, Mode extends ApiKeyMode> = Mode extends "optional"
+  ? readonly [options?: LanguageModelOptions<Base, Mode>]
+  : readonly [options: LanguageModelOptions<Base, Mode>]

-export type ModelFactory<Base, Mode extends ApiKeyMode, Model> = (id: string, ...args: ModelArgs<Base, Mode>) => Model
+export type LanguageModelFactory<Base, Mode extends ApiKeyMode, LanguageModel> = (
+  id: string,
+  ...args: LanguageModelArgs<Base, Mode>
+) => LanguageModel

 /**
 * Require at least one of the keys in `T`. Use for option shapes where any
@@ -1,6 +1,6 @@
 import { Config, Effect, Redacted } from "effect"
 import { Headers } from "effect/unstable/http"
-import { AuthenticationReason, InvalidRequestReason, LLMError, type HttpOptions } from "../schema"
+import { AuthenticationReason, InvalidRequestReason, AIError, type HttpOptions } from "../schema"

 export class MissingCredentialError extends Error {
  readonly _tag = "MissingCredentialError"
@@ -11,7 +11,7 @@ export class MissingCredentialError extends Error {
 }

 export type CredentialError = MissingCredentialError | Config.ConfigError
-export type AuthError = CredentialError | LLMError
+export type AuthError = CredentialError | AIError
 type Secret = string | Redacted.Redacted | Config.Config<string | Redacted.Redacted>

 export interface AuthInput {
@@ -100,7 +100,7 @@ export const headers = (input: Headers.Input) =>

 export const remove = (name: string) => auth((input) => Effect.succeed(Headers.remove(input.headers, name)))

-export const custom = (apply: (input: AuthInput) => Effect.Effect<Headers.Headers, LLMError>) => auth(apply)
+export const custom = (apply: (input: AuthInput) => Effect.Effect<Headers.Headers, AIError>) => auth(apply)

 export const passthrough = none

@@ -134,9 +134,9 @@ export function bearerHeader(name: string, source?: Secret | Credential) {
  return render(source)
 }

-const toLLMError = (error: AuthError): LLMError => {
+const toAIError = (error: AuthError): AIError => {
  if (error instanceof MissingCredentialError || error instanceof Config.ConfigError) {
-    return new LLMError({
+    return new AIError({
      module: "Auth",
      method: "apply",
      reason:
@@ -150,7 +150,7 @@ const toLLMError = (error: AuthError): LLMError => {

 export const toEffect =
  (input: Definition) =>
-  (authInput: AuthInput): Effect.Effect<Headers.Headers, LLMError> =>
-    input.apply(authInput).pipe(Effect.mapError(toLLMError))
+  (authInput: AuthInput): Effect.Effect<Headers.Headers, AIError> =>
+    input.apply(authInput).pipe(Effect.mapError(toAIError))

 export * as Auth from "./auth"
@@ -5,20 +5,20 @@ import { Endpoint, type EndpointPatch } from "./endpoint"
 import { RequestExecutor } from "./executor"
 import { Framing } from "./framing"
 import { HttpTransport } from "./transport"
-import type { Transport, TransportRuntime } from "./transport"
+import type { HttpRequestTransform, Transport, TransportRuntime } from "./transport"
 import { WebSocketExecutor } from "./transport"
 import type { Protocol } from "./protocol"
 import { applyCachePolicy } from "../cache-policy"
 import * as ProviderShared from "../protocols/shared"
-import type { LLMError, ProtocolID, ProviderOptions } from "../schema"
+import type { ProtocolID, ProviderOptions } from "../schema"
 import {
+  AIError,
  GenerationOptions,
  HttpOptions,
  LLMRequest,
  LLMResponse,
-  Model,
-  ModelLimits,
-  LLMError as LLMErrorClass,
+  LanguageModel,
+  LanguageModelLimits,
  LLMEvent,
  ProviderID,
  mergeGenerationOptions,
@@ -30,7 +30,7 @@ export interface RouteBody<Body> {
  /** Schema for the validated provider-native body sent as the JSON request. */
  readonly schema: Schema.Codec<Body, unknown>
  /** Build the provider-native body from a common `LLMRequest`. */
-  readonly from: (request: LLMRequest) => Effect.Effect<Body, LLMError>
+  readonly from: (request: LLMRequest) => Effect.Effect<Body, AIError>
 }

 export interface Route<Body, Prepared = unknown> {
@@ -45,13 +45,19 @@ export interface Route<Body, Prepared = unknown> {
  readonly defaults: RouteDefaults
  readonly body: RouteBody<Body>
  readonly with: (patch: RoutePatch<Body, Prepared>) => Route<Body, Prepared>
-  readonly model: <Options extends ProviderOptions = ProviderOptions>(input: RouteMappedModelInput) => Model<Options>
-  readonly prepareTransport: (body: Body, request: LLMRequest) => Effect.Effect<Prepared, LLMError>
+  readonly model: <Options extends ProviderOptions = ProviderOptions>(
+    input: RouteMappedLanguageModelInput,
+  ) => LanguageModel<Options>
+  readonly prepareTransport: (
+    body: Body,
+    request: LLMRequest,
+    options?: StreamOptions,
+  ) => Effect.Effect<Prepared, AIError>
  readonly streamPrepared: (
    prepared: Prepared,
    request: LLMRequest,
    runtime: TransportRuntime,
-  ) => Stream.Stream<LLMEvent, LLMError>
+  ) => Stream.Stream<LLMEvent, AIError>
 }

 // Route registries intentionally erase body generics after construction.
@@ -62,13 +68,13 @@ export type AnyRoute = Route<any, any>

 export type HttpOptionsInput = HttpOptions.Input

-export type RouteModelInput = Omit<Model.Input, "provider" | "route">
+export type RouteLanguageModelInput = Omit<LanguageModel.Input, "provider" | "route">

-export type RouteRoutedModelInput = Omit<Model.Input, "route">
+export type RouteRoutedLanguageModelInput = Omit<LanguageModel.Input, "route">

 export interface RouteDefaults {
  readonly headers?: Record<string, string>
-  readonly limits?: ModelLimits
+  readonly limits?: LanguageModelLimits
  readonly generation?: GenerationOptions
  readonly providerOptions?: ProviderOptions
  readonly http?: HttpOptions
@@ -76,7 +82,7 @@ export interface RouteDefaults {

 export interface RouteDefaultsInput {
  readonly headers?: Record<string, string>
-  readonly limits?: ModelLimits.Input
+  readonly limits?: LanguageModelLimits.Input
  readonly generation?: GenerationOptions.Input
  readonly providerOptions?: ProviderOptions
  readonly http?: HttpOptions.Input
@@ -90,14 +96,17 @@ export interface RoutePatch<Body, Prepared> extends RouteDefaultsInput {
  readonly endpoint?: EndpointPatch<Body>
 }

-type RouteMappedModelInput = RouteModelInput | RouteRoutedModelInput
+type RouteMappedLanguageModelInput = RouteLanguageModelInput | RouteRoutedLanguageModelInput

-const makeRouteModel = <Options extends ProviderOptions = ProviderOptions>(route: AnyRoute, mapped: RouteMappedModelInput) => {
+const makeRouteLanguageModel = <Options extends ProviderOptions = ProviderOptions>(
+  route: AnyRoute,
+  mapped: RouteMappedLanguageModelInput,
+) => {
  const provider = route.provider ?? ("provider" in mapped ? mapped.provider : undefined)
  if (!provider) throw new Error(`Route.model(${route.id}) requires a provider`)
  if (!endpointBaseURL(route.endpoint))
    throw new Error(`Route.model(${route.id}) requires an endpoint baseURL — configure it on the route first`)
-  return Model.make<Options>({
+  return LanguageModel.make<Options>({
    ...mapped,
    provider,
    route,
@@ -110,7 +119,7 @@ const mergeRouteDefaults = (base: RouteDefaults | undefined, patch: RouteDefault
    ...base,
    ...patch,
    headers,
-    limits: patch.limits === undefined ? base?.limits : ModelLimits.make(patch.limits),
+    limits: patch.limits === undefined ? base?.limits : LanguageModelLimits.make(patch.limits),
    generation: mergeGenerationOptions(generationOptions(base?.generation), generationOptions(patch.generation)),
    providerOptions: mergeProviderOptions(base?.providerOptions, patch.providerOptions),
    http: mergeHttpOptions(
@@ -145,12 +154,16 @@ export interface Interface {
  readonly generate: GenerateMethod
 }

+export interface StreamOptions {
+  readonly transform?: HttpRequestTransform
+}
+
 export interface StreamMethod {
-  (request: LLMRequest): Stream.Stream<LLMEvent, LLMError>
+  (request: LLMRequest, options?: StreamOptions): Stream.Stream<LLMEvent, AIError>
 }

 export interface GenerateMethod {
-  (request: LLMRequest): Effect.Effect<LLMResponse, LLMError>
+  (request: LLMRequest, options?: StreamOptions): Effect.Effect<LLMResponse, AIError>
 }

 export class Service extends Context.Service<Service, Interface>()("@opencode/LLMClient") {}
@@ -214,11 +227,11 @@ export interface MakeTransportInput<Body, Prepared, Frame, Event, State> {

 const streamError = (route: string, message: string, cause: Cause.Cause<unknown>) => {
  const failed = cause.reasons.find(Cause.isFailReason)?.error
-  if (failed instanceof LLMErrorClass) return failed
+  if (failed instanceof AIError) return failed
  return ProviderShared.eventError(route, message, Cause.pretty(cause))
 }

-const requireTerminalEvent = (route: string) => (events: Stream.Stream<LLMEvent, LLMError>) =>
+const requireTerminalEvent = (route: string) => (events: Stream.Stream<LLMEvent, AIError>) =>
  Stream.suspend(() => {
    let terminal = false
    return events.pipe(
@@ -284,9 +297,9 @@ function makeFromTransport<Body, Prepared, Frame, Event, State>(
          defaults: mergeRouteDefaults(route.defaults, defaults),
        })
      },
-      model: <Options extends ProviderOptions = ProviderOptions>(input: RouteMappedModelInput) =>
-        makeRouteModel<Options>(route, input),
-      prepareTransport: (body, request) =>
+      model: <Options extends ProviderOptions = ProviderOptions>(input: RouteMappedLanguageModelInput) =>
+        makeRouteLanguageModel<Options>(route, input),
+      prepareTransport: (body, request, options) =>
        routeInput.transport.prepare({
          body,
          request,
@@ -294,6 +307,7 @@ function makeFromTransport<Body, Prepared, Frame, Event, State>(
          auth: routeInput.auth ?? Auth.none,
          encodeBody,
          headers: routeInput.headers,
+          transform: options?.transform,
        }),
      streamPrepared: (prepared: Prepared, request: LLMRequest, runtime: TransportRuntime) => {
        const route = `${request.model.provider}/${request.model.route.id}`
@@ -359,14 +373,14 @@ export function make<Body, Prepared, Frame, Event, State>(
  })
 }

-const compile = Effect.fn("LLM.compile")(function* (request: LLMRequest) {
+const compile = Effect.fn("LLM.compile")(function* (request: LLMRequest, options?: StreamOptions) {
  const resolved = applyCachePolicy(resolveRequestOptions(request))
  const route = resolved.model.route

  const body = yield* route.body
    .from(resolved)
    .pipe(Effect.flatMap(ProviderShared.validateWith(Schema.decodeUnknownEffect(route.body.schema))))
-  const prepared = yield* route.prepareTransport(body, resolved)
+  const prepared = yield* route.prepareTransport(body, resolved, options)

  return {
    request: resolved,
@@ -389,17 +403,17 @@ export const compileRequest = Effect.fn("LLM.compileRequest")(function* (request
  }
 })

-const streamRequestWith = (runtime: TransportRuntime) => (request: LLMRequest) =>
+const streamRequestWith = (runtime: TransportRuntime) => (request: LLMRequest, options?: StreamOptions) =>
  Stream.unwrap(
    Effect.gen(function* () {
-      const compiled = yield* compile(request)
+      const compiled = yield* compile(request, options)
      return compiled.route.streamPrepared(compiled.prepared, compiled.request, runtime)
    }),
  )

 const generateWith = (stream: Interface["stream"]) =>
-  Effect.fn("LLM.generate")(function* (request: LLMRequest) {
-    const state = yield* stream(request).pipe(Stream.runFold(LLMResponse.empty, LLMResponse.reduce))
+  Effect.fn("LLM.generate")(function* (request: LLMRequest, options?: StreamOptions) {
+    const state = yield* stream(request, options).pipe(Stream.runFold(LLMResponse.empty, LLMResponse.reduce))
    const response = LLMResponse.complete(state)
    if (response) return response
    return yield* ProviderShared.eventError(
@@ -408,24 +422,24 @@ const generateWith = (stream: Interface["stream"]) =>
    )
  })

-export function stream(request: LLMRequest): Stream.Stream<LLMEvent, LLMError> {
+export function stream(request: LLMRequest, options?: StreamOptions): Stream.Stream<LLMEvent, AIError> {
  return Stream.unwrap(
    Effect.gen(function* () {
-      return (yield* Service).stream(request)
+      return (yield* Service).stream(request, options)
    }),
-  ) as Stream.Stream<LLMEvent, LLMError>
+  ) as Stream.Stream<LLMEvent, AIError>
 }

-export function generate(request: LLMRequest): Effect.Effect<LLMResponse, LLMError> {
+export function generate(request: LLMRequest, options?: StreamOptions): Effect.Effect<LLMResponse, AIError> {
  return Effect.gen(function* () {
-    return yield* (yield* Service).generate(request)
-  }) as Effect.Effect<LLMResponse, LLMError>
+    return yield* (yield* Service).generate(request, options)
+  }) as Effect.Effect<LLMResponse, AIError>
 }

-export const streamRequest = (request: LLMRequest) =>
+export const streamRequest = (request: LLMRequest, options?: StreamOptions) =>
  Stream.unwrap(
    Effect.gen(function* () {
-      return (yield* Service).stream(request)
+      return (yield* Service).stream(request, options)
    }),
  )

@@ -12,7 +12,7 @@ import {
  HttpRateLimitDetails,
  HttpRequestDetails,
  HttpResponseDetails,
-  LLMError,
+  AIError,
  TransportReason,
 } from "../schema"
 import { classifyProviderFailure } from "../provider-error"
@@ -20,10 +20,10 @@ import { classifyProviderFailure } from "../provider-error"
 export interface Interface {
  readonly execute: (
    request: HttpClientRequest.HttpClientRequest,
-  ) => Effect.Effect<HttpClientResponse.HttpClientResponse, LLMError>
+  ) => Effect.Effect<HttpClientResponse.HttpClientResponse, AIError>
 }

-export class Service extends Context.Service<Service, Interface>()("@opencode/LLM/RequestExecutor") {}
+export class Service extends Context.Service<Service, Interface>()("@opencode/AI/RequestExecutor") {}

 const BODY_LIMIT = 16_384
 const REDACTED = "<redacted>"
@@ -220,7 +220,7 @@ const statusError =
      const retryAfter = retryAfterMs(headers)
      const rateLimit = rateLimitDetails(headers, retryAfter)
      const details = responseBody(body, request)
-      return yield* new LLMError({
+      return yield* new AIError({
        module: "RequestExecutor",
        method: "execute",
        reason: classifyProviderFailure({
@@ -246,7 +246,7 @@ const toHttpError = (redactedNames: ReadonlyArray<string | RegExp>) => (error: u
    readonly kind?: string | undefined
    readonly request?: HttpClientRequest.HttpClientRequest | undefined
  }) =>
-    new LLMError({
+    new AIError({
      module: "RequestExecutor",
      method: "execute",
      reason: new TransportReason({
@@ -1,6 +1,6 @@
 import type { Stream } from "effect"
 import * as ProviderShared from "../protocols/shared"
-import type { LLMError } from "../schema"
+import type { AIError } from "../schema"

 /**
 * Decode a streaming HTTP response body into provider-protocol frames.
@@ -18,7 +18,7 @@ import type { LLMError } from "../schema"
 */
 export interface Definition<Frame> {
  readonly id: string
-  readonly frame: (bytes: Stream.Stream<Uint8Array, LLMError>) => Stream.Stream<Frame, LLMError>
+  readonly frame: (bytes: Stream.Stream<Uint8Array, AIError>) => Stream.Stream<Frame, AIError>
 }

 /** Server-Sent Events framing. Used by every JSON-streaming HTTP provider. */
@@ -1,13 +1,14 @@
 export { Route, LLMClient } from "./client"
 export type {
  Route as RouteShape,
-  RouteModelInput,
-  RouteRoutedModelInput,
+  RouteLanguageModelInput,
+  RouteRoutedLanguageModelInput,
  RouteDefaults,
  RouteDefaultsInput,
  AnyRoute,
  Interface as LLMClientShape,
  Service as LLMClientService,
+  StreamOptions,
 } from "./client"
 export * from "./executor"
 export { Auth } from "./auth"
@@ -22,4 +23,4 @@ export type { ApiKeyMode, AuthOverride, ProviderAuthOption } from "./auth-option
 export type { Definition as EndpointFn, EndpointInput } from "./endpoint"
 export type { Definition as FramingDef } from "./framing"
 export type { Protocol as ProtocolDef } from "./protocol"
-export type { Transport as TransportDef, TransportRuntime } from "./transport"
+export type { HttpRequest, HttpRequestTransform, Transport as TransportDef, TransportRuntime } from "./transport"
@@ -1,5 +1,5 @@
 import { Schema, type Effect } from "effect"
-import type { LLMError, LLMEvent, LLMRequest, ProtocolID } from "../schema"
+import type { AIError, LLMEvent, LLMRequest, ProtocolID } from "../schema"

 /**
 * The semantic API contract of one model server family.
@@ -47,7 +47,7 @@ export interface ProtocolBody<Body> {
  /** Schema for the validated provider-native body sent as the JSON request. */
  readonly schema: Schema.Codec<Body, unknown>
  /** Build the provider-native body from a common `LLMRequest`. */
-  readonly from: (request: LLMRequest) => Effect.Effect<Body, LLMError>
+  readonly from: (request: LLMRequest) => Effect.Effect<Body, AIError>
 }

 export interface ProtocolStream<Frame, Event, State> {
@@ -56,7 +56,7 @@ export interface ProtocolStream<Frame, Event, State> {
  /** Initial parser state. Called once per response with the resolved request. */
  readonly initial: (request: LLMRequest) => State
  /** Translate one event into emitted `LLMEvent`s plus the next state. */
-  readonly step: (state: State, event: Event) => Effect.Effect<readonly [State, ReadonlyArray<LLMEvent>], LLMError>
+  readonly step: (state: State, event: Event) => Effect.Effect<readonly [State, ReadonlyArray<LLMEvent>], AIError>
  /** Optional request-completion signal for transports that do not end naturally. */
  readonly terminal?: (event: Event) => boolean
  /** Optional flush emitted when the framed stream ends. */
@@ -28,57 +28,9 @@ const applyQuery = (url: string, query: Record<string, string> | undefined) => {
  return next.toString()
 }

-const PROTOCOL_BODY_OVERLAY_DENYLIST = new Set([
-  "anthropic_version",
-  "content",
-  "contents",
-  "frequencyPenalty",
-  "frequency_penalty",
-  "generationConfig",
-  "inferenceConfig",
-  "input",
-  "maxTokens",
-  "max_tokens",
-  "messages",
-  "model",
-  "presencePenalty",
-  "presence_penalty",
-  "responseFormat",
-  "response_format",
-  "seed",
-  "stop",
-  "stopSequences",
-  "stop_sequences",
-  "stream",
-  "streamOptions",
-  "stream_options",
-  "system",
-  "systemInstruction",
-  "system_instruction",
-  "temperature",
-  "thinking",
-  "toolChoice",
-  "toolConfig",
-  "tool_choice",
-  "tool_config",
-  "tools",
-  "topK",
-  "topP",
-  "top_k",
-  "top_p",
-])
-
-const forbiddenBodyOverlayKeys = (body: Record<string, unknown>) =>
-  Object.keys(body).filter((key) => PROTOCOL_BODY_OVERLAY_DENYLIST.has(key))
-
 const bodyWithOverlay = <Body>(body: Body, request: LLMRequest, encodeBody: (body: Body) => string) =>
  Effect.gen(function* () {
    if (request.http?.body === undefined) return { jsonBody: body, bodyText: encodeBody(body) }
-    const forbiddenKeys = forbiddenBodyOverlayKeys(request.http.body)
-    if (forbiddenKeys.length > 0)
-      return yield* ProviderShared.invalidRequest(
-        `http.body cannot overlay protocol-owned field(s): ${forbiddenKeys.join(", ")}`,
-      )
    if (ProviderShared.isRecord(body)) {
      const overlaid = mergeJsonRecords(body, request.http.body) ?? {}
      return { jsonBody: overlaid, bodyText: ProviderShared.encodeJson(overlaid) }
@@ -120,14 +72,19 @@ export const httpJson = <Body, Frame>(input: HttpJsonInput<Body, Frame>): HttpJs
  id: "http-json",
  with: (patch) => httpJson({ ...input, ...patch }),
  prepare: (prepareInput) =>
-    jsonRequestParts({
-      ...prepareInput,
-    }).pipe(
-      Effect.map((parts) => ({
-        request: ProviderShared.jsonPost({ url: parts.url, body: parts.bodyText, headers: parts.headers }),
+    Effect.gen(function* () {
+      const parts = yield* jsonRequestParts({ ...prepareInput })
+      const request = { url: parts.url, method: "POST", headers: { ...parts.headers }, body: parts.bodyText }
+      yield* (prepareInput.transform?.(request) ?? Effect.void)
+      return {
+        request: ProviderShared.jsonPost({
+          url: request.url,
+          body: request.body ?? "",
+          headers: Headers.fromInput(request.headers),
+        }),
        framing: input.framing,
-      })),
-    ),
+      }
+    }),
  frames: (prepared, request, runtime) =>
    Stream.unwrap(
      runtime.http
@@ -3,21 +3,26 @@ import { Endpoint } from "../endpoint"
 import { Auth } from "../auth"
 import type { Interface as RequestExecutorInterface } from "../executor"
 import type { Interface as WebSocketExecutorInterface } from "./websocket"
-import type { LLMError, LLMRequest } from "../../schema"
+import type { AIError, LLMRequest } from "../../schema"

 export interface TransportRuntime {
  readonly http: RequestExecutorInterface
  readonly webSocket?: WebSocketExecutorInterface
 }

+export interface HttpRequest {
+  url: string
+  readonly method: string
+  headers: Record<string, string>
+  body: string | undefined
+}
+
+export type HttpRequestTransform = (request: HttpRequest) => Effect.Effect<void>
+
 export interface Transport<Body, Prepared, Frame> {
  readonly id: string
-  readonly prepare: (input: TransportPrepareInput<Body>) => Effect.Effect<Prepared, LLMError>
-  readonly frames: (
-    prepared: Prepared,
-    request: LLMRequest,
-    runtime: TransportRuntime,
-  ) => Stream.Stream<Frame, LLMError>
+  readonly prepare: (input: TransportPrepareInput<Body>) => Effect.Effect<Prepared, AIError>
+  readonly frames: (prepared: Prepared, request: LLMRequest, runtime: TransportRuntime) => Stream.Stream<Frame, AIError>
 }

 export interface TransportPrepareInput<Body> {
@@ -27,6 +32,7 @@ export interface TransportPrepareInput<Body> {
  readonly auth: Auth.Definition
  readonly encodeBody: (body: Body) => string
  readonly headers?: (input: { readonly request: LLMRequest }) => Record<string, string>
+  readonly transform?: HttpRequestTransform
 }

 export * as HttpTransport from "./http"
@@ -1,6 +1,6 @@
 import { Cause, Context, Effect, Layer, Queue, Stream } from "effect"
 import { Headers } from "effect/unstable/http"
-import { LLMError, TransportReason } from "../../schema"
+import { AIError, TransportReason } from "../../schema"
 import * as HttpTransport from "./http"
 import type { Transport } from "./index"

@@ -10,13 +10,13 @@ export interface WebSocketRequest {
 }

 export interface WebSocketConnection {
-  readonly sendText: (message: string) => Effect.Effect<void, LLMError>
-  readonly messages: Stream.Stream<string | Uint8Array, LLMError>
+  readonly sendText: (message: string) => Effect.Effect<void, AIError>
+  readonly messages: Stream.Stream<string | Uint8Array, AIError>
  readonly close: Effect.Effect<void, never>
 }

 export interface Interface {
-  readonly open: (input: WebSocketRequest) => Effect.Effect<WebSocketConnection, LLMError>
+  readonly open: (input: WebSocketRequest) => Effect.Effect<WebSocketConnection, AIError>
 }

 type WebSocketConstructorWithHeaders = new (
@@ -24,14 +24,14 @@ type WebSocketConstructorWithHeaders = new (
  options?: { readonly headers?: Headers.Headers },
 ) => globalThis.WebSocket

-export class Service extends Context.Service<Service, Interface>()("@opencode/LLM/WebSocketExecutor") {}
+export class Service extends Context.Service<Service, Interface>()("@opencode/AI/WebSocketExecutor") {}

 const transportError = (
  method: string,
  message: string,
  input: { readonly url?: string; readonly kind?: string } = {},
 ) =>
-  new LLMError({
+  new AIError({
    module: "WebSocketExecutor",
    method,
    reason: new TransportReason({ message, url: input.url, kind: input.kind }),
@@ -59,7 +59,7 @@ const waitOpen = (ws: globalThis.WebSocket, input: WebSocketRequest) => {
      }),
    )
  }
-  return Effect.callback<void, LLMError>((resume, signal) => {
+  return Effect.callback<void, AIError>((resume, signal) => {
    const cleanup = () => {
      ws.removeEventListener("open", onOpen)
      ws.removeEventListener("error", onError)
@@ -138,10 +138,10 @@ export const layer: Layer.Layer<Service> = Layer.succeed(Service, Service.of({ o
 export const fromWebSocket = (
  ws: globalThis.WebSocket,
  input: WebSocketRequest,
-): Effect.Effect<WebSocketConnection, LLMError> =>
+): Effect.Effect<WebSocketConnection, AIError> =>
  Effect.gen(function* () {
    yield* waitOpen(ws, input)
-    const messages = yield* Queue.bounded<string | Uint8Array, LLMError | Cause.Done<void>>(128)
+    const messages = yield* Queue.bounded<string | Uint8Array, AIError | Cause.Done<void>>(128)

    const onMessage = (event: MessageEvent) => {
      if (typeof event.data === "string") return Queue.offerUnsafe(messages, event.data)
@@ -213,7 +213,7 @@ export interface JsonPrepared {
 }

 export interface JsonInput<Body, Message> {
-  readonly toMessage: (body: Body | Record<string, unknown>) => Effect.Effect<Message, LLMError>
+  readonly toMessage: (body: Body | Record<string, unknown>) => Effect.Effect<Message, AIError>
  readonly encodeMessage: (message: Message) => string
 }

@@ -2,28 +2,28 @@ import { Schema } from "effect"
 import { Tool } from "@opencode-ai/schema/tool"
 import { ModelID, ProviderID, ProviderMetadata, RouteID } from "./ids"

-export const ProviderFailureClassification = Schema.Literal("context-overflow")
+export const ProviderFailureClassification = Schema.Literals(["context-overflow", "payload-too-large"])
 export type ProviderFailureClassification = typeof ProviderFailureClassification.Type

-export class HttpRequestDetails extends Schema.Class<HttpRequestDetails>("LLM.HttpRequestDetails")({
+export class HttpRequestDetails extends Schema.Class<HttpRequestDetails>("AI.HttpRequestDetails")({
  method: Schema.String,
  url: Schema.String,
  headers: Schema.Record(Schema.String, Schema.String),
 }) {}

-export class HttpResponseDetails extends Schema.Class<HttpResponseDetails>("LLM.HttpResponseDetails")({
+export class HttpResponseDetails extends Schema.Class<HttpResponseDetails>("AI.HttpResponseDetails")({
  status: Schema.Number,
  headers: Schema.Record(Schema.String, Schema.String),
 }) {}

-export class HttpRateLimitDetails extends Schema.Class<HttpRateLimitDetails>("LLM.HttpRateLimitDetails")({
+export class HttpRateLimitDetails extends Schema.Class<HttpRateLimitDetails>("AI.HttpRateLimitDetails")({
  retryAfterMs: Schema.optional(Schema.Number),
  limit: Schema.optional(Schema.Record(Schema.String, Schema.String)),
  remaining: Schema.optional(Schema.Record(Schema.String, Schema.String)),
  reset: Schema.optional(Schema.Record(Schema.String, Schema.String)),
 }) {}

-export class HttpContext extends Schema.Class<HttpContext>("LLM.HttpContext")({
+export class HttpContext extends Schema.Class<HttpContext>("AI.HttpContext")({
  request: HttpRequestDetails,
  response: Schema.optional(HttpResponseDetails),
  body: Schema.optional(Schema.String),
@@ -32,7 +32,7 @@ export class HttpContext extends Schema.Class<HttpContext>("LLM.HttpContext")({
  rateLimit: Schema.optional(HttpRateLimitDetails),
 }) {}

-export class InvalidRequestReason extends Schema.Class<InvalidRequestReason>("LLM.Error.InvalidRequest")({
+export class InvalidRequestReason extends Schema.Class<InvalidRequestReason>("AI.Error.InvalidRequest")({
  _tag: Schema.tag("InvalidRequest"),
  message: Schema.String,
  parameter: Schema.optional(Schema.String),
@@ -41,18 +41,18 @@ export class InvalidRequestReason extends Schema.Class<InvalidRequestReason>("LL
  http: Schema.optional(HttpContext),
 }) {}

-export class NoRouteReason extends Schema.Class<NoRouteReason>("LLM.Error.NoRoute")({
+export class NoRouteReason extends Schema.Class<NoRouteReason>("AI.Error.NoRoute")({
  _tag: Schema.tag("NoRoute"),
  route: RouteID,
  provider: ProviderID,
  model: ModelID,
 }) {
  get message() {
-    return `No LLM route for ${this.provider}/${this.model} using ${this.route}`
+    return `No AI route for ${this.provider}/${this.model} using ${this.route}`
  }
 }

-export class AuthenticationReason extends Schema.Class<AuthenticationReason>("LLM.Error.Authentication")({
+export class AuthenticationReason extends Schema.Class<AuthenticationReason>("AI.Error.Authentication")({
  _tag: Schema.tag("Authentication"),
  message: Schema.String,
  kind: Schema.Literals(["missing", "invalid", "expired", "insufficient-permissions", "unknown"]),
@@ -60,7 +60,7 @@ export class AuthenticationReason extends Schema.Class<AuthenticationReason>("LL
  http: Schema.optional(HttpContext),
 }) {}

-export class RateLimitReason extends Schema.Class<RateLimitReason>("LLM.Error.RateLimit")({
+export class RateLimitReason extends Schema.Class<RateLimitReason>("AI.Error.RateLimit")({
  _tag: Schema.tag("RateLimit"),
  message: Schema.String,
  retryAfterMs: Schema.optional(Schema.Number),
@@ -69,21 +69,21 @@ export class RateLimitReason extends Schema.Class<RateLimitReason>("LLM.Error.Ra
  http: Schema.optional(HttpContext),
 }) {}

-export class QuotaExceededReason extends Schema.Class<QuotaExceededReason>("LLM.Error.QuotaExceeded")({
+export class QuotaExceededReason extends Schema.Class<QuotaExceededReason>("AI.Error.QuotaExceeded")({
  _tag: Schema.tag("QuotaExceeded"),
  message: Schema.String,
  providerMetadata: Schema.optional(ProviderMetadata),
  http: Schema.optional(HttpContext),
 }) {}

-export class ContentPolicyReason extends Schema.Class<ContentPolicyReason>("LLM.Error.ContentPolicy")({
+export class ContentPolicyReason extends Schema.Class<ContentPolicyReason>("AI.Error.ContentPolicy")({
  _tag: Schema.tag("ContentPolicy"),
  message: Schema.String,
  providerMetadata: Schema.optional(ProviderMetadata),
  http: Schema.optional(HttpContext),
 }) {}

-export class ProviderInternalReason extends Schema.Class<ProviderInternalReason>("LLM.Error.ProviderInternal")({
+export class ProviderInternalReason extends Schema.Class<ProviderInternalReason>("AI.Error.ProviderInternal")({
  _tag: Schema.tag("ProviderInternal"),
  message: Schema.String,
  status: Schema.optional(Schema.Number),
@@ -92,7 +92,7 @@ export class ProviderInternalReason extends Schema.Class<ProviderInternalReason>
  http: Schema.optional(HttpContext),
 }) {}

-export class TransportReason extends Schema.Class<TransportReason>("LLM.Error.Transport")({
+export class TransportReason extends Schema.Class<TransportReason>("AI.Error.Transport")({
  _tag: Schema.tag("Transport"),
  message: Schema.String,
  kind: Schema.optional(Schema.String),
@@ -101,7 +101,7 @@ export class TransportReason extends Schema.Class<TransportReason>("LLM.Error.Tr
 }) {}

 export class InvalidProviderOutputReason extends Schema.Class<InvalidProviderOutputReason>(
-  "LLM.Error.InvalidProviderOutput",
+  "AI.Error.InvalidProviderOutput",
 )({
  _tag: Schema.tag("InvalidProviderOutput"),
  message: Schema.String,
@@ -110,7 +110,7 @@ export class InvalidProviderOutputReason extends Schema.Class<InvalidProviderOut
  providerMetadata: Schema.optional(ProviderMetadata),
 }) {}

-export class UnknownProviderReason extends Schema.Class<UnknownProviderReason>("LLM.Error.UnknownProvider")({
+export class UnknownProviderReason extends Schema.Class<UnknownProviderReason>("AI.Error.UnknownProvider")({
  _tag: Schema.tag("UnknownProvider"),
  message: Schema.String,
  status: Schema.optional(Schema.Number),
@@ -118,7 +118,7 @@ export class UnknownProviderReason extends Schema.Class<UnknownProviderReason>("
  http: Schema.optional(HttpContext),
 }) {}

-export const LLMErrorReason = Schema.Union([
+export const AIErrorReason = Schema.Union([
  InvalidRequestReason,
  NoRouteReason,
  AuthenticationReason,
@@ -130,12 +130,12 @@ export const LLMErrorReason = Schema.Union([
  InvalidProviderOutputReason,
  UnknownProviderReason,
 ]).pipe(Schema.toTaggedUnion("_tag"))
-export type LLMErrorReason = Schema.Schema.Type<typeof LLMErrorReason>
+export type AIErrorReason = Schema.Schema.Type<typeof AIErrorReason>

-export class LLMError extends Schema.TaggedErrorClass<LLMError>()("LLM.Error", {
+export class AIError extends Schema.TaggedErrorClass<AIError>()("AI.Error", {
  module: Schema.String,
  method: Schema.String,
-  reason: LLMErrorReason,
+  reason: AIErrorReason,
 }) {
  override readonly cause = this.reason

@@ -48,7 +48,7 @@ import { ProviderFailureClassification } from "./errors"
 * — for fields we don't normalize and for billing-level audit trails.
 * Matches the same escape-hatch field on `LLMEvent`.
 */
-export class Usage extends Schema.Class<Usage>("LLM.Usage")({
+export class Usage extends Schema.Class<Usage>("AI.Usage")({
  inputTokens: Schema.optional(Schema.Number),
  outputTokens: Schema.optional(Schema.Number),
  nonCachedInputTokens: Schema.optional(Schema.Number),
@@ -1,5 +1,6 @@
 import { Schema } from "effect"
-import { LLM, ProviderMetadata } from "@opencode-ai/schema/llm"
+import { ProviderMetadata } from "@opencode-ai/schema/ai"
+import { LLM } from "@opencode-ai/schema/llm"

 export { ProviderMetadata }

@@ -11,10 +12,10 @@ export type ProtocolID = Schema.Schema.Type<typeof ProtocolID>
 export const RouteID = Schema.String
 export type RouteID = Schema.Schema.Type<typeof RouteID>

-export const ModelID = Schema.String.pipe(Schema.brand("LLM.ModelID"))
+export const ModelID = Schema.String.pipe(Schema.brand("AI.ModelID"))
 export type ModelID = typeof ModelID.Type

-export const ProviderID = Schema.String.pipe(Schema.brand("LLM.ProviderID"))
+export const ProviderID = Schema.String.pipe(Schema.brand("AI.ProviderID"))
 export type ProviderID = typeof ProviderID.Type

 export const ResponseID = Schema.String
@@ -1,7 +1,7 @@
 import { Schema } from "effect"
 import { Tool } from "@opencode-ai/schema/tool"
 import { JsonSchema, MessageRole, ProviderMetadata } from "./ids"
-import { CacheHint, CachePolicy, GenerationOptions, HttpOptions, ModelSchema, ProviderOptions } from "./options"
+import { CacheHint, CachePolicy, GenerationOptions, HttpOptions, LanguageModelSchema, ProviderOptions } from "./options"
 import { isRecord } from "../utils/record"

 const systemPartSchema = Schema.Struct({
@@ -124,6 +124,7 @@ export const ToolCallPart = Object.assign(
    name: Schema.String,
    input: Schema.Unknown,
    providerExecuted: Schema.optional(Schema.Boolean),
+    cache: Schema.optional(CacheHint),
    metadata: Schema.optional(Schema.Record(Schema.String, Schema.Unknown)),
    providerMetadata: Schema.optional(ProviderMetadata),
  }).annotate({ identifier: "LLM.Content.ToolCall" }),
@@ -168,6 +169,7 @@ export const ReasoningPart = Schema.Struct({
  type: Schema.Literal("reasoning"),
  text: Schema.String,
  encrypted: Schema.optional(Schema.String),
+  cache: Schema.optional(CacheHint),
  metadata: Schema.optional(Schema.Record(Schema.String, Schema.Unknown)),
  providerMetadata: Schema.optional(ProviderMetadata),
 }).annotate({ identifier: "LLM.Content.Reasoning" })
@@ -261,7 +263,7 @@ export namespace ToolChoice {

 export class LLMRequest extends Schema.Class<LLMRequest>("LLM.Request")({
  id: Schema.optional(Schema.String),
-  model: ModelSchema,
+  model: LanguageModelSchema,
  system: Schema.Array(SystemPart),
  messages: Schema.Array(Message),
  tools: Schema.Array(ToolDefinition),
@@ -50,7 +50,7 @@ export const mergeProviderOptions = (
  return Object.keys(result).length === 0 ? undefined : result
 }

-export class HttpOptions extends Schema.Class<HttpOptions>("LLM.HttpOptions")({
+export class HttpOptions extends Schema.Class<HttpOptions>("AI.HttpOptions")({
  body: Schema.optional(JsonSchema),
  headers: Schema.optional(Schema.Record(Schema.String, Schema.String)),
  query: Schema.optional(Schema.Record(Schema.String, Schema.String)),
@@ -121,31 +121,32 @@ export const mergeGenerationOptions = (...items: ReadonlyArray<GenerationOptions
  return Object.values(result).some((value) => value !== undefined) ? result : undefined
 }

-export class ModelLimits extends Schema.Class<ModelLimits>("LLM.ModelLimits")({
+export class LanguageModelLimits extends Schema.Class<LanguageModelLimits>("LLM.LanguageModelLimits")({
  context: Schema.optional(Schema.Number),
+  input: Schema.optional(Schema.Number),
  output: Schema.optional(Schema.Number),
 }) {}

-export namespace ModelLimits {
-  export type Input = ModelLimits | ConstructorParameters<typeof ModelLimits>[0]
+export namespace LanguageModelLimits {
+  export type Input = LanguageModelLimits | ConstructorParameters<typeof LanguageModelLimits>[0]

-  /** Normalize model limit input into the canonical `ModelLimits` class. */
+  /** Normalize model limit input into the canonical `LanguageModelLimits` class. */
  export const make = (input: Input | undefined) =>
-    input instanceof ModelLimits ? input : new ModelLimits(input ?? {})
+    input instanceof LanguageModelLimits ? input : new LanguageModelLimits(input ?? {})
 }

-export class ModelDefaults extends Schema.Class<ModelDefaults>("LLM.ModelDefaults")({
-  limits: Schema.optional(ModelLimits),
+export class LanguageModelDefaults extends Schema.Class<LanguageModelDefaults>("LLM.LanguageModelDefaults")({
+  limits: Schema.optional(LanguageModelLimits),
  generation: Schema.optional(GenerationOptions),
  providerOptions: Schema.optional(ProviderOptions),
  http: Schema.optional(HttpOptions),
 }) {}

-export namespace ModelDefaults {
+export namespace LanguageModelDefaults {
  export type Input =
-    | ModelDefaults
+    | LanguageModelDefaults
    | {
-        readonly limits?: ModelLimits.Input
+        readonly limits?: LanguageModelLimits.Input
        readonly generation?: GenerationOptions.Input
        readonly providerOptions?: ProviderOptions
        readonly http?: HttpOptions.Input
@@ -153,9 +154,9 @@ export namespace ModelDefaults {

  /** Normalize selected-model request defaults without applying precedence. */
  export const make = (input: Input) => {
-    if (input instanceof ModelDefaults) return input
-    return new ModelDefaults({
-      limits: input.limits === undefined ? undefined : ModelLimits.make(input.limits),
+    if (input instanceof LanguageModelDefaults) return input
+    return new LanguageModelDefaults({
+      limits: input.limits === undefined ? undefined : LanguageModelLimits.make(input.limits),
      generation: input.generation === undefined ? undefined : GenerationOptions.make(input.generation),
      providerOptions: input.providerOptions,
      http: input.http === undefined ? undefined : HttpOptions.make(input.http),
@@ -163,30 +164,39 @@ export namespace ModelDefaults {
  }
 }

-export const ModelToolSchemaCompatibility = Schema.Literals(["gemini", "moonshot"])
-export type ModelToolSchemaCompatibility = Schema.Schema.Type<typeof ModelToolSchemaCompatibility>
+export const LanguageModelToolSchemaCompatibility = Schema.Literals(["gemini", "moonshot"])
+export type LanguageModelToolSchemaCompatibility = Schema.Schema.Type<typeof LanguageModelToolSchemaCompatibility>

-export class ModelCompatibility extends Schema.Class<ModelCompatibility>("LLM.ModelCompatibility")({
-  toolSchema: Schema.optional(ModelToolSchemaCompatibility),
+export const LanguageModelMaxTokensFieldCompatibility = Schema.Literals(["max_completion_tokens", "max_tokens"])
+export type LanguageModelMaxTokensFieldCompatibility = Schema.Schema.Type<
+  typeof LanguageModelMaxTokensFieldCompatibility
+>
+
+export class LanguageModelCompatibility extends Schema.Class<LanguageModelCompatibility>(
+  "LLM.LanguageModelCompatibility",
+)({
+  toolSchema: Schema.optional(LanguageModelToolSchemaCompatibility),
  reasoningField: Schema.optional(Schema.String),
+  maxTokensField: Schema.optional(LanguageModelMaxTokensFieldCompatibility),
 }) {}

-export namespace ModelCompatibility {
-  export type Input = ModelCompatibility | ConstructorParameters<typeof ModelCompatibility>[0]
+export namespace LanguageModelCompatibility {
+  export type Input = LanguageModelCompatibility | ConstructorParameters<typeof LanguageModelCompatibility>[0]

  /** Normalize model/upstream compatibility metadata without projecting requests. */
-  export const make = (input: Input) => (input instanceof ModelCompatibility ? input : new ModelCompatibility(input))
+  export const make = (input: Input) =>
+    input instanceof LanguageModelCompatibility ? input : new LanguageModelCompatibility(input)
 }

-export class Model<Options extends ProviderOptions = ProviderOptions> {
+export class LanguageModel<Options extends ProviderOptions = ProviderOptions> {
  declare protected readonly _ProviderOptions: Options
  readonly id: ModelID
  readonly provider: ProviderID
  readonly route: AnyRoute
-  readonly defaults?: ModelDefaults
-  readonly compatibility?: ModelCompatibility
+  readonly defaults?: LanguageModelDefaults
+  readonly compatibility?: LanguageModelCompatibility

-  constructor(input: Model.ConstructorInput) {
+  constructor(input: LanguageModel.ConstructorInput) {
    this.id = input.id
    this.provider = input.provider
    this.route = input.route
@@ -194,17 +204,18 @@ export class Model<Options extends ProviderOptions = ProviderOptions> {
    this.compatibility = input.compatibility
  }

-  static make<Options extends ProviderOptions = ProviderOptions>(input: Model.Input) {
-    return new Model<Options>({
+  static make<Options extends ProviderOptions = ProviderOptions>(input: LanguageModel.Input) {
+    return new LanguageModel<Options>({
      id: ModelID.make(input.id),
      provider: ProviderID.make(input.provider),
      route: input.route,
-      defaults: input.defaults === undefined ? undefined : ModelDefaults.make(input.defaults),
-      compatibility: input.compatibility === undefined ? undefined : ModelCompatibility.make(input.compatibility),
+      defaults: input.defaults === undefined ? undefined : LanguageModelDefaults.make(input.defaults),
+      compatibility:
+        input.compatibility === undefined ? undefined : LanguageModelCompatibility.make(input.compatibility),
    })
  }

-  static input<Options extends ProviderOptions>(model: Model<Options>): Model.ConstructorInput {
+  static input<Options extends ProviderOptions>(model: LanguageModel<Options>): LanguageModel.ConstructorInput {
    return {
      id: model.id,
      provider: model.provider,
@@ -214,37 +225,40 @@ export class Model<Options extends ProviderOptions = ProviderOptions> {
    }
  }

-  static update<Options extends ProviderOptions>(model: Model<Options>, patch: Partial<Model.Input>) {
+  static update<Options extends ProviderOptions>(model: LanguageModel<Options>, patch: Partial<LanguageModel.Input>) {
    if (Object.keys(patch).length === 0) return model
-    return Model.make<Options>({
-      ...Model.input(model),
+    return LanguageModel.make<Options>({
+      ...LanguageModel.input(model),
      ...patch,
    })
  }
 }

-export namespace Model {
+export namespace LanguageModel {
  export type ConstructorInput = {
    readonly id: ModelID
    readonly provider: ProviderID
    readonly route: AnyRoute
-    readonly defaults?: ModelDefaults
-    readonly compatibility?: ModelCompatibility
+    readonly defaults?: LanguageModelDefaults
+    readonly compatibility?: LanguageModelCompatibility
  }

  export type Input = Omit<ConstructorInput, "id" | "provider" | "defaults" | "compatibility"> & {
    readonly id: string | ModelID
    readonly provider: string | ProviderID
-    readonly defaults?: ModelDefaults.Input
-    readonly compatibility?: ModelCompatibility.Input
+    readonly defaults?: LanguageModelDefaults.Input
+    readonly compatibility?: LanguageModelCompatibility.Input
  }
 }

-export type ModelInput = Model.Input
+export type LanguageModelInput = LanguageModel.Input

-export type ModelProviderOptions<SelectedModel> = SelectedModel extends Model<infer Options> ? Options : never
+export type LanguageModelProviderOptions<SelectedModel> =
+  SelectedModel extends LanguageModel<infer Options> ? Options : never

-export const ModelSchema = Schema.declare((value): value is Model => value instanceof Model, { expected: "LLM.Model" })
+export const LanguageModelSchema = Schema.declare((value): value is LanguageModel => value instanceof LanguageModel, {
+  expected: "LLM.LanguageModel",
+})

 export class CacheHint extends Schema.Class<CacheHint>("LLM.CacheHint")({
  type: Schema.Literals(["ephemeral", "persistent"]),
@@ -5,13 +5,13 @@ import {
  LLMEvent,
  LLMResponse,
  type FinishReasonDetails,
-  type LLMError,
+  type AIError,
  type LLMRequest,
  type UsageInput,
 } from "./schema"
 import { Context, Deferred, Effect, Latch, Layer, Queue, Scope, Stream } from "effect"

-export type Response = readonly LLMEvent[] | Stream.Stream<LLMEvent, LLMError>
+export type Response = readonly LLMEvent[] | Stream.Stream<LLMEvent, AIError>

 export type Gate = Readonly<{ started: Effect.Effect<void>; release: Effect.Effect<void> }>

@@ -63,7 +63,7 @@ export const textWithUsage = (value: string, id: string, inputTokens: number) =>

 export const tool = (id: string, name: string, input: unknown) => toolCalls(LLMEvent.toolCall({ id, name, input }))

-export const failAfter = (error: LLMError, ...events: readonly LLMEvent[]) =>
+export const failAfter = (error: AIError, ...events: readonly LLMEvent[]) =>
  Stream.fromIterable(events).pipe(Stream.concat(Stream.fail(error)))

 export const hangAfter = (...events: readonly LLMEvent[]) => Stream.concat(Stream.fromIterable(events), Stream.never)
@@ -3,11 +3,11 @@ import { Effect, Schema, Stream } from "effect"
 import { LLM, LLMRequest, LLMResponse } from "../src"
 import { Route, Endpoint, LLMClient, Protocol, type FramingDef } from "../src/route"
 import { compileRequest } from "../src/route/client"
-import { Model } from "../src/schema"
+import { LanguageModel } from "../src/schema"
 import { testEffect } from "./lib/effect"
 import { dynamicResponse } from "./lib/http"

-const updateModel = (model: Model, patch: Partial<Model.Input>) => Model.update(model, patch)
+const updateModel = (model: LanguageModel, patch: Partial<LanguageModel.Input>) => LanguageModel.update(model, patch)

 const Json = Schema.fromJsonString(Schema.Unknown)
 const encodeJson = Schema.encodeSync(Json)
@@ -86,7 +86,7 @@ const configuredGemini = gemini.with({ endpoint: { baseURL: "https://fake.local"

 const request = LLM.request({
  id: "req_1",
-  model: Model.make({
+  model: LanguageModel.make({
    id: "fake-model",
    provider: "fake-provider",
    route: configuredFake,
@@ -1,6 +1,6 @@
 import { Config } from "effect"
 import { Auth } from "../src/route"
-import type { ModelFactory } from "../src/route/auth-options"
+import type { LanguageModelFactory } from "../src/route/auth-options"
 import * as OpenAIChat from "../src/protocols/openai-chat"
 import * as AmazonBedrock from "../src/providers/amazon-bedrock"
 import * as Anthropic from "../src/providers/anthropic"
@@ -23,13 +23,13 @@ type BaseOptions = {
  readonly headers?: Record<string, string>
 }

-type Model = {
+type LanguageModel = {
  readonly id: string
 }

 declare const auth: Auth.Definition
-declare const optionalAuthModel: ModelFactory<BaseOptions, "optional", Model>
-declare const requiredAuthModel: ModelFactory<BaseOptions, "required", Model>
+declare const optionalAuthModel: LanguageModelFactory<BaseOptions, "optional", LanguageModel>
+declare const requiredAuthModel: LanguageModelFactory<BaseOptions, "required", LanguageModel>
 const configApiKey = Config.redacted("OPENAI_API_KEY")

 OpenAIChat.route.model({ id: "gpt-4.1-mini" })
@@ -4,12 +4,12 @@ import { Headers } from "effect/unstable/http"
 import { LLM } from "../src"
 import { Auth } from "../src/route/auth"
 import * as OpenAIChat from "../src/protocols/openai-chat"
-import { Model } from "../src/schema"
+import { LanguageModel } from "../src/schema"
 import { it } from "./lib/effect"

 const request = LLM.request({
  id: "req_auth",
-  model: Model.make({ id: "fake-model", provider: "fake", route: OpenAIChat.route }),
+  model: LanguageModel.make({ id: "fake-model", provider: "fake", route: OpenAIChat.route }),
  prompt: "hello",
 })

@@ -137,24 +137,61 @@ describe("request option precedence", () => {
    ),
  )

-  it.effect("rejects raw body overlays for protocol-owned roots", () =>
-    Effect.gen(function* () {
-      const model = OpenAIChat.route
-        .with({ endpoint: { baseURL: "https://api.openai.test/v1/" }, auth: Auth.bearer("test") })
-        .model({ id: "gpt-4o-mini" })
-      const error = yield* compileRequest(
-        LLM.request({
-          model,
-          prompt: "Say hello.",
-          http: { body: { model: "gpt-5", messages: [], tools: [] } },
-        }),
-      ).pipe(Effect.flip)
+  it.effect("transforms the final HTTP request after serialization and authentication", () =>
+    LLMClient.generate(
+      LLM.request({
+        model: OpenAIChat.route
+          .with({ endpoint: { baseURL: "https://api.openai.test/v1/" }, auth: Auth.bearer("fresh-key") })
+          .model({ id: "gpt-4o-mini" }),
+        prompt: "Say hello.",
+      }),
+      {
+        transform: (request) =>
+          Effect.sync(() => {
+            expect(request.headers.authorization).toBe("Bearer fresh-key")
+            request.url = "https://proxy.test/v1/chat/completions"
+            request.headers["x-plugin"] = "transformed"
+            request.body = JSON.stringify({ transformed: true })
+          }),
+      },
+    ).pipe(
+      Effect.provide(
+        dynamicResponse((input) =>
+          Effect.gen(function* () {
+            const web = yield* HttpClientRequest.toWeb(input.request).pipe(Effect.orDie)
+            expect(web.url).toBe("https://proxy.test/v1/chat/completions")
+            expect(web.headers.get("x-plugin")).toBe("transformed")
+            expect(decodeJson(input.text)).toEqual({ transformed: true })
+            return input.respond(sseEvents(deltaChunk({}, "stop")), {
+              headers: { "content-type": "text/event-stream" },
+            })
+          }),
+        ),
+      ),
+    ),
+  )

-      expect(error.reason).toMatchObject({
-        _tag: "InvalidRequest",
-        message: "http.body cannot overlay protocol-owned field(s): model, messages, tools",
-      })
-    }),
+  it.effect("applies raw body overlays after protocol lowering", () =>
+    LLMClient.generate(
+      LLM.request({
+        model: OpenAIChat.route
+          .with({ endpoint: { baseURL: "https://api.openai.test/v1/" }, auth: Auth.bearer("test") })
+          .model({ id: "gpt-4o-mini" }),
+        prompt: "Say hello.",
+        http: { body: { model: "gpt-5", messages: [], tools: [] } },
+      }),
+    ).pipe(
+      Effect.provide(
+        dynamicResponse((input) =>
+          Effect.gen(function* () {
+            expect(decodeJson(input.text)).toMatchObject({ model: "gpt-5", messages: [], tools: [] })
+            return input.respond(sseEvents(deltaChunk({}, "stop")), {
+              headers: { "content-type": "text/event-stream" },
+            })
+          }),
+        ),
+      ),
+    ),
  )

  it.effect("uses model output limits after route limits and before call maxTokens", () =>
@@ -1,4 +1,12 @@
-import { LLM, Message, ToolCallPart, ToolDefinition, ToolResultPart, type ContentPart, type Model } from "../src"
+import {
+  LLM,
+  Message,
+  ToolCallPart,
+  ToolDefinition,
+  ToolResultPart,
+  type ContentPart,
+  type LanguageModel,
+} from "../src"

 export const basicContinuation = ["system", "user-text", "assistant-text", "user-follow-up"] as const
 export const toolContinuation = ["tool-call", "tool-result"] as const
@@ -40,7 +48,7 @@ export const continuationTool = ToolDefinition.make({

 export function continuationRequest(input: {
  readonly id: string
-  readonly model: Model
+  readonly model: LanguageModel
  readonly features: ReadonlyArray<ContinuationFeature>
  readonly image?: string
 }) {
@@ -2,11 +2,11 @@ import { describe, expect, test } from "bun:test"
 import { LLM } from "../src"
 import * as OpenAIChat from "../src/protocols/openai-chat"
 import { Endpoint } from "../src/route"
-import { Model } from "../src/schema"
+import { LanguageModel } from "../src/schema"

 const request = () =>
  LLM.request({
-    model: Model.make({
+    model: LanguageModel.make({
      id: "model-1",
      provider: "test",
      route: OpenAIChat.route,
@@ -1,7 +1,7 @@
 import { describe, expect } from "bun:test"
 import { Effect, Layer, Ref } from "effect"
 import { Headers, HttpClient, HttpClientRequest, HttpClientResponse } from "effect/unstable/http"
-import { LLM, LLMError } from "../src"
+import { LLM, AIError } from "../src"
 import { LLMClient, RequestExecutor } from "../src/route"
 import * as OpenAIChat from "../src/protocols/openai-chat"
 import { dynamicResponse } from "./lib/http"
@@ -58,13 +58,13 @@ const countedResponsesLayer = (attempts: Ref.Ref<number>, responses: ReadonlyArr
    ),
  )

-const expectLLMError = (error: unknown) => {
-  expect(error).toBeInstanceOf(LLMError)
-  if (!(error instanceof LLMError)) throw new Error("expected LLMError")
+const expectAIError = (error: unknown) => {
+  expect(error).toBeInstanceOf(AIError)
+  if (!(error instanceof AIError)) throw new Error("expected AIError")
  return error
 }

-const errorHttp = (error: LLMError) => ("http" in error.reason ? error.reason.http : undefined)
+const errorHttp = (error: AIError) => ("http" in error.reason ? error.reason.http : undefined)

 describe("RequestExecutor", () => {
  it.effect("classifies context overflow responses", () =>
@@ -72,7 +72,7 @@ describe("RequestExecutor", () => {
      const executor = yield* RequestExecutor.Service
      const error = yield* executor.execute(request).pipe(Effect.flip)

-      expectLLMError(error)
+      expectAIError(error)
      expect(error.reason).toMatchObject({ _tag: "InvalidRequest", classification: "context-overflow" })
    }).pipe(
      Effect.provide(
@@ -85,14 +85,17 @@ describe("RequestExecutor", () => {
    ),
  )

-  it.effect("does not classify generic HTTP 413 payload errors as context overflow", () =>
+  it.effect("classifies generic HTTP 413 payload errors", () =>
    Effect.gen(function* () {
      const executor = yield* RequestExecutor.Service
      const error = yield* executor.execute(request).pipe(Effect.flip)

-      expectLLMError(error)
-      expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
-      expect("classification" in error.reason ? error.reason.classification : undefined).toBeUndefined()
+      expectAIError(error)
+      expect(error.reason).toMatchObject({
+        _tag: "InvalidRequest",
+        classification: "payload-too-large",
+        http: { response: { status: 413 } },
+      })
    }).pipe(Effect.provide(responsesLayer([new Response("request too large", { status: 413 })]))),
  )

@@ -101,7 +104,7 @@ describe("RequestExecutor", () => {
      const executor = yield* RequestExecutor.Service
      const error = yield* executor.execute(request).pipe(Effect.flip)

-      expectLLMError(error)
+      expectAIError(error)
      expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
      expect("classification" in error.reason ? error.reason.classification : undefined).toBeUndefined()
    }).pipe(Effect.provide(responsesLayer([new Response("invalid parameter", { status: 400 })]))),
@@ -114,7 +117,7 @@ describe("RequestExecutor", () => {
          const executor = yield* RequestExecutor.Service
          const error = yield* executor.execute(request).pipe(Effect.flip)

-          expectLLMError(error)
+          expectAIError(error)
          expect(error.reason).toMatchObject({ _tag: "RateLimit" })
        }).pipe(Effect.provide(responsesLayer([new Response(body, { status: 400 })])))

@@ -131,7 +134,7 @@ describe("RequestExecutor", () => {
          const executor = yield* RequestExecutor.Service
          const error = yield* executor.execute(request).pipe(Effect.flip)

-          expectLLMError(error)
+          expectAIError(error)
          expect(error.reason).toMatchObject({ _tag: "ProviderInternal" })
        }).pipe(Effect.provide(responsesLayer([new Response(body, { status: 400 })])))

@@ -145,7 +148,7 @@ describe("RequestExecutor", () => {
      const executor = yield* RequestExecutor.Service
      const error = yield* executor.execute(request).pipe(Effect.flip)

-      expectLLMError(error)
+      expectAIError(error)
      expect(error).toMatchObject({
        reason: {
          _tag: "RateLimit",
@@ -187,7 +190,7 @@ describe("RequestExecutor", () => {
      const executor = yield* RequestExecutor.Service
      const error = yield* executor.execute(request).pipe(Effect.flip)

-      expectLLMError(error)
+      expectAIError(error)
      expect(errorHttp(error)?.request.headers["x-safe"]).toBe("<redacted>")
      expect(errorHttp(error)?.response?.headers["x-safe"]).toBe("<redacted>")
    }).pipe(
@@ -201,7 +204,7 @@ describe("RequestExecutor", () => {
      const executor = yield* RequestExecutor.Service
      const error = yield* executor.execute(request).pipe(Effect.flip)

-      expectLLMError(error)
+      expectAIError(error)
      expect(error.reason).toMatchObject({ _tag: "RateLimit" })
      expect(error.reason._tag === "RateLimit" ? error.reason.rateLimit : undefined).toEqual({
        retryAfterMs: 0,
@@ -234,7 +237,7 @@ describe("RequestExecutor", () => {
      const executor = yield* RequestExecutor.Service
      const error = yield* executor.execute(request).pipe(Effect.flip)

-      expectLLMError(error)
+      expectAIError(error)
      expect(error.reason).toMatchObject({ _tag: "ProviderInternal" })
      expect(errorHttp(error)?.rateLimit).toEqual({
        retryAfterMs: 0,
@@ -277,7 +280,7 @@ describe("RequestExecutor", () => {
        ),
      )

-      expectLLMError(error)
+      expectAIError(error)
      expect(error.reason).toMatchObject({ _tag: "ProviderInternal", status: 503 })
      expect(yield* Ref.get(attempts)).toBe(1)
    }),
@@ -290,7 +293,7 @@ describe("RequestExecutor", () => {
          const executor = yield* RequestExecutor.Service
          const error = yield* executor.execute(request).pipe(Effect.flip)

-          expectLLMError(error)
+          expectAIError(error)
          expect(error.reason).toMatchObject({ _tag: "ProviderInternal", status })
        }).pipe(
          Effect.provide(
@@ -313,7 +316,7 @@ describe("RequestExecutor", () => {
      const executor = yield* RequestExecutor.Service
      const error = yield* executor.execute(request).pipe(Effect.flip)

-      expectLLMError(error)
+      expectAIError(error)
      expect(error.reason).toMatchObject({ _tag: "Authentication" })
      expect(errorHttp(error)?.bodyTruncated).toBe(true)
      expect(errorHttp(error)?.body).toHaveLength(16_384)
@@ -332,7 +335,7 @@ describe("RequestExecutor", () => {
      const executor = yield* RequestExecutor.Service
      const error = yield* executor.execute(request).pipe(Effect.flip)

-      expectLLMError(error)
+      expectAIError(error)
      expect(errorHttp(error)?.body).toContain('"key":"<redacted>"')
      expect(errorHttp(error)?.body).toContain("api_key=<redacted>")
      expect(errorHttp(error)?.body).not.toContain("body-secret")
@@ -353,7 +356,7 @@ describe("RequestExecutor", () => {
      const executor = yield* RequestExecutor.Service
      const error = yield* executor.execute(secretRequest).pipe(Effect.flip)

-      expectLLMError(error)
+      expectAIError(error)
      expect(errorHttp(error)?.body).toContain("provider echoed <redacted>")
      expect(errorHttp(error)?.body).toContain("authorization <redacted>")
      expect(errorHttp(error)?.body).not.toContain("query-secret-123")
@@ -392,7 +395,7 @@ describe("RequestExecutor", () => {
        Effect.flip,
      )

-      expectLLMError(error)
+      expectAIError(error)
      expect(error.reason).toMatchObject({ _tag: "InvalidProviderOutput" })
      expect(yield* Ref.get(attempts)).toBe(1)
    }),
@@ -1,5 +1,5 @@
 import { describe, expect, test } from "bun:test"
-import { ImageInput, LLM, LLMClient, Provider } from "@opencode-ai/ai"
+import { AIError, ImageInput, LanguageModel, LLM, LLMClient, Provider } from "@opencode-ai/ai"
 import { Route, Protocol } from "@opencode-ai/ai/route"
 import { Provider as ProviderSubpath } from "@opencode-ai/ai/provider"
 import {
@@ -26,6 +26,8 @@ describe("public exports", () => {
    expect(LLM.request).toBeFunction()
    expect(LLMClient.Service).toBeFunction()
    expect(LLMClient.layer).toBeDefined()
+    expect(AIError).toBeFunction()
+    expect(LanguageModel.make).toBeFunction()
    expect(ImageInput.bytes).toBeFunction()
    expect(Provider.make).toBeFunction()
    expect(ProviderSubpath.make).toBe(Provider.make)
@@ -53,9 +55,7 @@ describe("public exports", () => {
    expect(CloudflareWorkersAI.configure).toBeFunction()
    expect(CloudflareWorkersAI.configure({ accountId: "fixture", apiKey: "fixture" }).model).toBeFunction()
    expect(OpenRouter.model).toBeFunction()
-    expect(OpenRouter.provider.model).toBe(OpenRouter.model)
    expect(XAI.model).toBeFunction()
-    expect(XAI.provider.model).toBe(XAI.model)
    expect(XAI.provider.responses).toBe(XAI.responses)
    expect(XAI.provider.chat).toBe(XAI.chat)
    expect(XAI.configure({ apiKey: "fixture" }).responses("grok-4.3").route.id).toBe("openai-responses")
@@ -1,5 +1,5 @@
 import { Schema } from "effect"
-import { LLM, type Model, type ModelProviderOptions, type ProviderOptions } from "../src"
+import { LLM, type LanguageModel, type LanguageModelProviderOptions, type ProviderOptions } from "../src"
 import { OpenAIChat } from "../src/protocols"

 interface ExampleOptions {
@@ -40,8 +40,8 @@ LLM.generateObject({
  providerOptions: { example: { mode: false } },
 })

-declare const generic: Model
+declare const generic: LanguageModel
 LLM.request({ model: generic, prompt: "Hello", providerOptions: { arbitrary: { option: true } } })

-const options: ModelProviderOptions<typeof model> = { example: { mode: "fast" } }
+const options: LanguageModelProviderOptions<typeof model> = { example: { mode: "fast" } }
 void options
@@ -6,7 +6,7 @@ import {
  GenerationOptions,
  LLMRequest,
  Message,
-  Model,
+  LanguageModel,
  ToolCallPart,
  ToolChoice,
  ToolDefinition,
@@ -20,13 +20,13 @@ describe("llm constructors", () => {
  test("builds canonical schema classes from ergonomic input", () => {
    const request = LLM.request({
      id: "req_1",
-      model: Model.make({ id: "fake-model", provider: "fake", route: chatRoute }),
+      model: LanguageModel.make({ id: "fake-model", provider: "fake", route: chatRoute }),
      system: "You are concise.",
      prompt: "Say hello.",
    })

    expect(request).toBeInstanceOf(LLMRequest)
-    expect(request.model).toBeInstanceOf(Model)
+    expect(request.model).toBeInstanceOf(LanguageModel)
    expect(request.messages[0]).toBeInstanceOf(Message)
    expect(request.system).toEqual([{ type: "text", text: "You are concise." }])
    expect(request.messages[0]?.content).toEqual([{ type: "text", text: "Say hello." }])
@@ -37,7 +37,7 @@ describe("llm constructors", () => {
  test("updates requests without spreading schema class instances", () => {
    const base = LLM.request({
      id: "req_1",
-      model: Model.make({ id: "fake-model", provider: "fake", route: chatRoute }),
+      model: LanguageModel.make({ id: "fake-model", provider: "fake", route: chatRoute }),
      prompt: "Say hello.",
    })
    const updated = LLMRequest.update(base, {
@@ -54,7 +54,7 @@ describe("llm constructors", () => {

  test("keeps request options separate from route defaults", () => {
    const request = LLM.request({
-      model: Model.make({
+      model: LanguageModel.make({
        id: "fake-model",
        provider: "fake",
        route: chatRoute.with({
@@ -81,7 +81,7 @@ describe("llm constructors", () => {
  test("updates canonical requests from the request datatype", () => {
    const base = LLM.request({
      id: "req_1",
-      model: Model.make({ id: "fake-model", provider: "fake", route: chatRoute }),
+      model: LanguageModel.make({ id: "fake-model", provider: "fake", route: chatRoute }),
      prompt: "Say hello.",
    })
    const updated = LLMRequest.update(base, { messages: [...base.messages, Message.assistant("Hi.")] })
@@ -94,19 +94,19 @@ describe("llm constructors", () => {
  })

  test("updates canonical models from the model datatype", () => {
-    const base = Model.make({
+    const base = LanguageModel.make({
      id: "fake-model",
      provider: "fake",
      route: chatRoute,
    })
-    const updated = Model.update(base, {
+    const updated = LanguageModel.update(base, {
      route: responsesRoute,
      defaults: { generation: { maxTokens: 20 } },
      compatibility: { toolSchema: "gemini" },
    })
-    const updatedInput = Model.input(updated)
+    const updatedInput = LanguageModel.input(updated)

-    expect(updated).toBeInstanceOf(Model)
+    expect(updated).toBeInstanceOf(LanguageModel)
    expect(String(updated.id)).toBe("fake-model")
    expect(updated.route).toBe(responsesRoute)
    expect(updated.defaults?.generation).toEqual({ maxTokens: 20 })
@@ -114,7 +114,7 @@ describe("llm constructors", () => {
    expect(updatedInput.defaults).toBe(updated.defaults)
    expect(updatedInput.compatibility).toBe(updated.compatibility)
    expect(String(updatedInput.provider)).toBe("fake")
-    expect(Model.update(updated, {})).toBe(updated)
+    expect(LanguageModel.update(updated, {})).toBe(updated)
  })

  test("carries model defaults and compatibility through route model selection", () => {
@@ -155,7 +155,7 @@ describe("llm constructors", () => {
    expect(ToolChoice.make("required")).toEqual(new ToolChoice({ type: "required" }))
    expect(
      LLM.request({
-        model: Model.make({
+        model: LanguageModel.make({
          id: "fake-model",
          provider: "fake",
          route: chatRoute,
@@ -181,7 +181,7 @@ describe("llm constructors", () => {
      { type: "text", text: "Use parameterized SQL.", cache: new CacheHint({ type: "ephemeral" }) },
    ])
    const request = LLM.request({
-      model: Model.make({ id: "fake-model", provider: "fake", route: chatRoute }),
+      model: LanguageModel.make({ id: "fake-model", provider: "fake", route: chatRoute }),
      system: "Initial operator prompt.",
      messages: [Message.user("Review this."), update],
    })
@@ -6,7 +6,6 @@ describe("provider error classification", () => {
  test("classifies provider token limit messages as context overflow", () => {
    const messages = [
      "tokens in request more than max tokens allowed",
-      '{"error":{"type":"request_too_large","message":"Request exceeds the maximum size"}}',
      "Requested token count exceeds the model's maximum context length of 131072 tokens.",
      "Input length (265330) exceeds model's maximum context length (262144).",
      "Input length 131393 exceeds the maximum allowed input length of 131040 tokens.",
@@ -19,6 +18,24 @@ describe("provider error classification", () => {
    expect(messages.every(isContextOverflow)).toBe(true)
  })

+  test("classifies request size failures separately from context overflow", () => {
+    const failures = [
+      classifyProviderFailure({ message: "request too large", status: 413 }),
+      classifyProviderFailure({
+        message: '{"error":{"type":"request_too_large","message":"Request exceeds the maximum size"}}',
+        status: 400,
+      }),
+      classifyProviderFailure({ message: "upstream request entity too large", status: 502 }),
+    ]
+
+    expect(failures).toEqual(
+      failures.map((failure) =>
+        expect.objectContaining({ _tag: "InvalidRequest", classification: "payload-too-large" }),
+      ),
+    )
+    expect(isContextOverflow("413 status code (no body)")).toBe(false)
+  })
+
  test("does not classify rate limits as context overflow", () => {
    const messages = [
      "Throttling error: Too many tokens, please wait before trying again.",
@@ -59,9 +76,10 @@ describe("provider error classification", () => {
  })

  test("classifies transient client statuses as provider internal", () => {
-    expect(
-      [408, 409].map((status) => classifyProviderFailure({ message: `HTTP ${status}`, status })._tag),
-    ).toEqual(["ProviderInternal", "ProviderInternal"])
+    expect([408, 409].map((status) => classifyProviderFailure({ message: `HTTP ${status}`, status })._tag)).toEqual([
+      "ProviderInternal",
+      "ProviderInternal",
+    ])
  })

  test("classifies nested provider codes when a top-level code is also present", () => {
@@ -9,9 +9,39 @@ LLM.request({
  providerOptions: { gemini: { thinkingConfig: { thinkingBudget: 1024 } } },
 })

+LLM.request({
+  model,
+  prompt: "Hello",
+  providerOptions: {
+    gemini: {
+      // @ts-expect-error Gemini safety settings require a threshold for every category.
+      safetySettings: [{ category: "HARM_CATEGORY_HATE_SPEECH" }],
+    },
+  },
+})
+
+LLM.request({
+  model,
+  prompt: "Hello",
+  providerOptions: {
+    gemini: {
+      cachedContent: "cachedContents/example",
+      safetySettings: [{ category: "HARM_CATEGORY_HATE_SPEECH", threshold: "BLOCK_ONLY_HIGH" }],
+      serviceTier: "future-tier",
+      thinkingConfig: { thinkingLevel: "high", includeThoughts: true },
+    },
+  },
+})
+
 LLM.request({
  model,
  prompt: "Hello",
  // @ts-expect-error Gemini thinking budgets must be numeric.
  providerOptions: { gemini: { thinkingConfig: { thinkingBudget: "large" } } },
 })
+
+LLM.request({
+  model,
+  prompt: "Hello",
+  providerOptions: { gemini: { thinkingConfig: { thinkingLevel: "maximum" } } },
+})
@@ -5,6 +5,28 @@ const model = OpenRouter.provider.model("anthropic/claude-sonnet-4.5")

 LLM.request({ model, prompt: "Hello", providerOptions: { openrouter: { usage: true } } })

+LLM.request({
+  model,
+  prompt: "Hello",
+  providerOptions: {
+    openrouter: {
+      models: ["google/gemini-3.1-pro"],
+      provider: {
+        order: ["anthropic"],
+        require_parameters: true,
+        data_collection: "future-policy",
+        sort: "future-sort",
+        max_price: { prompt: "0.50" },
+      },
+      reasoning: { effort: "future-effort", exclude: false },
+      plugins: [{ id: "future-plugin", enabled: true }],
+      web_search_options: { engine: "future-engine" },
+      debug: { echo_upstream_body: true },
+      user: "user_123",
+    },
+  },
+})
+
 LLM.request({
  model,
  prompt: "Hello",
@@ -3,11 +3,11 @@ import { XAI } from "../../src/providers"

 const model = XAI.provider.model("grok-4")

-LLM.request({ model, prompt: "Hello", providerOptions: { openai: { reasoningEffort: "high" } } })
+LLM.request({ model, prompt: "Hello", providerOptions: { xai: { reasoningEffort: "high" } } })

 LLM.request({
  model,
  prompt: "Hello",
  // @ts-expect-error xAI's OpenAI-compatible reasoning effort must be a string.
-  providerOptions: { openai: { reasoningEffort: true } },
+  providerOptions: { xai: { reasoningEffort: true } },
 })
@@ -21,6 +21,8 @@ describe("provider package entrypoints", () => {
      import("@opencode-ai/ai/providers/google-vertex/chat"),
      import("@opencode-ai/ai/providers/google-vertex/responses"),
      import("@opencode-ai/ai/providers/google-vertex/messages"),
+      import("@opencode-ai/ai/providers/openrouter"),
+      import("@opencode-ai/ai/providers/xai"),
    ])

    for (const module of modules) expect(module.model).toBeFunction()
@@ -29,6 +31,35 @@ describe("provider package entrypoints", () => {
    expect(modules[12].model).toBe(modules[13].model)
  })

+  test("maps OpenRouter and xAI package settings onto executable models", async () => {
+    const OpenRouter = await import("@opencode-ai/ai/providers/openrouter")
+    const XAI = await import("@opencode-ai/ai/providers/xai")
+    const settings = {
+      apiKey: "fixture",
+      baseURL: "https://provider.example.test/v1",
+      headers: { "x-application": "opencode" },
+      body: { service_tier: "priority" },
+      limits: { context: 200_000, output: 64_000 },
+    }
+    const openrouter = OpenRouter.model("anthropic/claude-sonnet-4", {
+      ...settings,
+      providerOptions: { openrouter: { usage: true } },
+    })
+    const xai = XAI.model("grok-4", {
+      ...settings,
+      providerOptions: { xai: { reasoningEffort: "high" } },
+    })
+
+    for (const selected of [openrouter, xai]) {
+      expect(selected.route.endpoint.baseURL).toBe(settings.baseURL)
+      expect(selected.route.defaults.headers).toEqual(settings.headers)
+      expect(selected.route.defaults.http?.body).toEqual(settings.body)
+      expect(selected.route.defaults.limits).toEqual(settings.limits)
+    }
+    expect(openrouter.route.defaults.providerOptions).toEqual({ openrouter: { usage: true } })
+    expect(xai.route.defaults.providerOptions).toMatchObject({ xai: { reasoningEffort: "high", store: false } })
+  })
+
  test("maps package settings onto the executable model", () => {
    const selected = model("gpt-5", {
      apiKey: "fixture",
@@ -1,9 +1,9 @@
 import { Provider } from "../src/provider"
-import { ProviderID, type Model } from "../src/schema"
+import { ProviderID, type LanguageModel } from "../src/schema"

-declare const model: (id: string) => Model
-declare const requiredModel: (id: string, options: { readonly baseURL: string }) => Model
-declare const chat: (id: string, options: { readonly apiKey: string }) => Model
+declare const model: (id: string) => LanguageModel
+declare const requiredModel: (id: string, options: { readonly baseURL: string }) => LanguageModel
+declare const chat: (id: string, options: { readonly apiKey: string }) => LanguageModel

 Provider.make({
  id: ProviderID.make("example"),
@@ -1,6 +1,6 @@
 import { describe, expect } from "bun:test"
 import { Effect } from "effect"
-import { LLM, LLMError, Message, ToolCallPart } from "../../src"
+import { LLM, AIError, Message, ToolCallPart } from "../../src"
 import { LLMClient } from "../../src/route"
 import * as Anthropic from "../../src/providers/anthropic"
 import { weatherToolName } from "../recorded-scenarios"
@@ -37,7 +37,7 @@ describe("Anthropic Messages sad-path recorded", () => {
    Effect.gen(function* () {
      const error = yield* LLMClient.generate(malformedToolOrderRequest).pipe(Effect.flip)

-      expect(error).toBeInstanceOf(LLMError)
+      expect(error).toBeInstanceOf(AIError)
      expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
      expect(error.message).toContain("HTTP 400")
    }),
@@ -1,7 +1,7 @@
 import { describe, expect } from "bun:test"
 import { Effect } from "effect"
 import { HttpClientRequest } from "effect/unstable/http"
-import { CacheHint, LLM, LLMError, LLMRequest, Message, ToolCallPart, ToolDefinition, Usage } from "../../src"
+import { CacheHint, LLM, AIError, LLMRequest, Message, ToolCallPart, ToolDefinition, Usage } from "../../src"
 import { Auth, LLMClient } from "../../src/route"
 import { compileRequest } from "../../src/route/client"
 import * as AnthropicMessages from "../../src/protocols/anthropic-messages"
@@ -684,9 +684,7 @@ describe("Anthropic Messages route", () => {
        ),
      )

-      expect(response.toolCalls).toMatchObject([
-        { id: "call_1", name: "lookup", input: { query: "weather" } },
-      ])
+      expect(response.toolCalls).toMatchObject([{ id: "call_1", name: "lookup", input: { query: "weather" } }])
    }),
  )

@@ -935,7 +933,7 @@ describe("Anthropic Messages route", () => {

      const error = yield* LLMClient.generate(request).pipe(Effect.provide(fixedResponse(body)), Effect.flip)

-      expect(error).toBeInstanceOf(LLMError)
+      expect(error).toBeInstanceOf(AIError)
      expect(error.message).toContain("Invalid JSON input for anthropic-messages tool call web_search")
    }),
  )
@@ -1009,7 +1007,7 @@ describe("Anthropic Messages route", () => {
        Effect.flip,
      )

-      expect(error).toBeInstanceOf(LLMError)
+      expect(error).toBeInstanceOf(AIError)
      expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
      expect(error.message).toContain("HTTP 400")
    }),
@@ -1,6 +1,6 @@
 import { describe, expect } from "bun:test"
 import { Effect } from "effect"
-import { LLM, LLMError, LLMRequest, Message, ToolCallPart, ToolDefinition, Usage } from "../../src"
+import { LLM, AIError, LLMRequest, Message, ToolCallPart, ToolDefinition, Usage } from "../../src"
 import { Auth, LLMClient } from "../../src/route"
 import { compileRequest } from "../../src/route/client"
 import * as Gemini from "../../src/protocols/gemini"
@@ -41,7 +41,14 @@ describe("Gemini route", () => {
    Effect.gen(function* () {
      const prepared = yield* compileRequest(
        LLMRequest.update(request, {
-          providerOptions: { gemini: { thinkingConfig: { thinkingBudget: 0, includeThoughts: false } } },
+          providerOptions: {
+            gemini: {
+              cachedContent: "cachedContents/example",
+              safetySettings: [{ category: "HARM_CATEGORY_HATE_SPEECH", threshold: "BLOCK_ONLY_HIGH" }],
+              serviceTier: "priority",
+              thinkingConfig: { thinkingBudget: 0, includeThoughts: false, thinkingLevel: "high" },
+            },
+          },
        }),
      )
      const filtered = yield* compileRequest(
@@ -49,12 +56,33 @@ describe("Gemini route", () => {
          providerOptions: { gemini: { thinkingConfig: { thinkingBudget: "invalid", includeThoughts: false } } },
        }),
      )
+      const defaulted = yield* compileRequest(
+        LLMRequest.update(request, {
+          providerOptions: { gemini: { thinkingConfig: { thinkingLevel: "high" } } },
+        }),
+      )
+      const emptySafetySettings = yield* compileRequest(
+        LLMRequest.update(request, {
+          providerOptions: { gemini: { safetySettings: [] } },
+        }),
+      )

      expect(prepared.body.generationConfig?.thinkingConfig).toEqual({
        thinkingBudget: 0,
        includeThoughts: false,
+        thinkingLevel: "high",
      })
+      expect(prepared.body.cachedContent).toBe("cachedContents/example")
+      expect(prepared.body.safetySettings).toEqual([
+        { category: "HARM_CATEGORY_HATE_SPEECH", threshold: "BLOCK_ONLY_HIGH" },
+      ])
+      expect(prepared.body.serviceTier).toBe("priority")
      expect(filtered.body.generationConfig?.thinkingConfig).toEqual({ includeThoughts: false })
+      expect(defaulted.body.generationConfig?.thinkingConfig).toEqual({
+        includeThoughts: true,
+        thinkingLevel: "high",
+      })
+      expect(emptySafetySettings.body.safetySettings).toEqual([])
    }),
  )

@@ -684,7 +712,7 @@ describe("Gemini route", () => {
        Effect.flip,
      )

-      expect(error).toBeInstanceOf(LLMError)
+      expect(error).toBeInstanceOf(AIError)
      expect(error.reason).toMatchObject({ _tag: "InvalidProviderOutput" })
      expect(error.message).toContain("Invalid google/gemini stream event")
    }),
@@ -181,23 +181,6 @@ describe("Google Vertex providers", () => {
    }),
  )

-  it.effect("protects the Vertex Messages API version from body overlays", () =>
-    Effect.gen(function* () {
-      const error = yield* compileRequest(
-        LLM.request({
-          model: GoogleVertexMessages.configure({
-            accessToken: "vertex-token",
-            http: { body: { anthropic_version: "wrong" } },
-            project: "vertex-project",
-          }).model("claude-sonnet-4-6"),
-          prompt: "Say hello.",
-        }),
-      ).pipe(Effect.flip)
-
-      expect(error.message).toContain("http.body cannot overlay protocol-owned field(s): anthropic_version")
-    }),
-  )
-
  it.effect("routes tuned Gemini models through their deployed endpoint", () =>
    Effect.gen(function* () {
      const response = yield* LLMClient.generate(
@@ -1,6 +1,6 @@
 import { describe, expect } from "bun:test"
 import { Effect } from "effect"
-import { LLM, LLMEvent, LLMResponse, Model } from "../../src"
+import { LLM, LLMEvent, LLMResponse, LanguageModel } from "../../src"
 import { OpenAIChat } from "../../src/protocols/openai-chat"
 import * as OpenAICompatible from "../../src/providers/openai-compatible"
 import * as OpenRouter from "../../src/providers/openrouter"
@@ -12,7 +12,7 @@ import { expectWeatherToolLoop, goldenWeatherToolLoopRequest, runWeatherToolLoop
 const cases = [
  {
    name: "OpenRouter",
-    model: Model.update(
+    model: LanguageModel.update(
      OpenRouter.configure({
        apiKey: process.env.OPENROUTER_API_KEY ?? "fixture",
        providerOptions: { openrouter: { reasoning: { max_tokens: 1024 } } },
@@ -25,7 +25,7 @@ const cases = [
  },
  {
    name: "Vercel AI Gateway",
-    model: Model.update(
+    model: LanguageModel.update(
      OpenAICompatible.configure({
        provider: "vercel-ai-gateway",
        baseURL: "https://ai-gateway.vercel.sh/v1",
@@ -4,11 +4,11 @@ import { HttpClientRequest } from "effect/unstable/http"
 import {
  HttpOptions,
  LLM,
-  LLMError,
+  AIError,
  LLMEvent,
  LLMRequest,
  Message,
-  Model,
+  LanguageModel,
  ToolCallPart,
  ToolDefinition,
  Usage,
@@ -104,7 +104,7 @@ describe("OpenAI Chat route", () => {
    Effect.gen(function* () {
      const prepared = yield* compileRequest(
        LLM.request({
-          model: Model.update(model, { compatibility: { reasoningField: "vendor_reasoning" } }),
+          model: LanguageModel.update(model, { compatibility: { reasoningField: "vendor_reasoning" } }),
          messages: [
            Message.assistant([
              {
@@ -130,7 +130,7 @@ describe("OpenAI Chat route", () => {
    Effect.gen(function* () {
      const error = yield* compileRequest(
        LLM.request({
-          model: Model.update(model, { compatibility: { reasoningField: "content" } }),
+          model: LanguageModel.update(model, { compatibility: { reasoningField: "content" } }),
          messages: [Message.assistant([{ type: "reasoning", text: "thinking" }])],
        }),
      ).pipe(Effect.flip)
@@ -171,7 +171,9 @@ describe("OpenAI Chat route", () => {
  it.effect("adds native query params to the Chat Completions URL", () =>
    LLMClient.generate(
      LLMRequest.update(request, {
-        model: Model.update(model, { route: model.route.with({ endpoint: { query: { "api-version": "v1" } } }) }),
+        model: LanguageModel.update(model, {
+          route: model.route.with({ endpoint: { query: { "api-version": "v1" } } }),
+        }),
      }),
    ).pipe(
      Effect.provide(
@@ -624,7 +626,7 @@ describe("OpenAI Chat route", () => {

  it.effect("parses and replays a configured custom reasoning field", () =>
    Effect.gen(function* () {
-      const custom = Model.update(model, { compatibility: { reasoningField: "vendor_reasoning" } })
+      const custom = LanguageModel.update(model, { compatibility: { reasoningField: "vendor_reasoning" } })
      const response = yield* LLMClient.generate(LLMRequest.update(request, { model: custom })).pipe(
        Effect.provide(
          fixedResponse(
@@ -1172,7 +1174,7 @@ describe("OpenAI Chat route", () => {
        Effect.flip,
      )

-      expect(error).toBeInstanceOf(LLMError)
+      expect(error).toBeInstanceOf(AIError)
      expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
      expect(error.message).toContain("HTTP 400")
    }),
@@ -144,6 +144,20 @@ describe("OpenAI-compatible Chat route", () => {
    }),
  )

+  it.effect("configures the max tokens request field", () =>
+    Effect.gen(function* () {
+      const compatible = OpenAICompatibleChat.route
+        .with({ provider: "custom", endpoint: { baseURL: "https://api.custom.test/v1" } })
+        .model({ id: "custom-model", compatibility: { maxTokensField: "max_completion_tokens" } })
+      const prepared = yield* compileRequest(
+        LLM.request({ model: compatible, prompt: "Say hello.", generation: { maxTokens: 20 } }),
+      )
+
+      expect(prepared.body).toMatchObject({ max_completion_tokens: 20 })
+      expect(prepared.body).not.toHaveProperty("max_tokens")
+    }),
+  )
+
  it.effect("matches AI SDK compatible tool request body fixture", () =>
    Effect.gen(function* () {
      const prepared = yield* compileRequest(
@@ -3,11 +3,11 @@ import { ConfigProvider, Effect, Layer, Stream } from "effect"
 import { Headers, HttpClientRequest } from "effect/unstable/http"
 import {
  LLM,
-  LLMError,
+  AIError,
  LLMEvent,
  LLMRequest,
  Message,
-  Model,
+  LanguageModel,
  ToolCallPart,
  ToolDefinition,
  ToolResultPart,
@@ -304,7 +304,9 @@ describe("OpenAI Responses route", () => {
    Effect.gen(function* () {
      yield* LLMClient.generate(
        LLMRequest.update(request, {
-          model: Model.update(model, { route: model.route.with({ endpoint: { query: { "api-version": "v1" } } }) }),
+          model: LanguageModel.update(model, {
+            route: model.route.with({ endpoint: { query: { "api-version": "v1" } } }),
+          }),
        }),
      ).pipe(
        Effect.provide(
@@ -985,9 +987,7 @@ describe("OpenAI Responses route", () => {

      for (const event of events) {
        const error = yield* LLMClient.generate(request).pipe(
-          Effect.provide(
-            fixedResponse(sseEvents(event, { type: "response.completed", response: { id: "resp_1" } })),
-          ),
+          Effect.provide(fixedResponse(sseEvents(event, { type: "response.completed", response: { id: "resp_1" } }))),
          Effect.flip,
        )
        expect(error.reason._tag).toBe("InvalidProviderOutput")
@@ -1843,7 +1843,7 @@ describe("OpenAI Responses route", () => {
        Effect.flip,
      )

-      expect(error).toBeInstanceOf(LLMError)
+      expect(error).toBeInstanceOf(AIError)
      expect(error.reason).toMatchObject({ _tag: "RateLimit", message: "rate_limit_exceeded: Slow down" })
    }),
  )
@@ -2037,7 +2037,7 @@ describe("OpenAI Responses route", () => {
        Effect.flip,
      )

-      expect(error).toBeInstanceOf(LLMError)
+      expect(error).toBeInstanceOf(AIError)
      expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
      expect(error.message).toContain("HTTP 400")
    }),
@@ -1,6 +1,6 @@
 import { describe, expect } from "bun:test"
 import { Effect } from "effect"
-import { LLM, Message } from "../../src"
+import { CacheHint, LLM, Message } from "../../src"
 import { LLMClient } from "../../src/route"
 import { compileRequest } from "../../src/route/client"
 import * as OpenRouter from "../../src/providers/openrouter"
@@ -27,10 +27,131 @@ describe("OpenRouter", () => {
        model: "openai/gpt-4o-mini",
        messages: [{ role: "user", content: "Say hello." }],
        stream: true,
+        usage: { include: true },
      })
    }),
  )

+  it.effect("lowers the native cache policy to OpenRouter cache controls", () =>
+    Effect.gen(function* () {
+      const prepared = yield* compileRequest(
+        LLM.request({
+          model: OpenRouter.configure({ apiKey: "test-key" }).model("anthropic/claude-sonnet-4.6"),
+          system: [
+            { type: "text", text: "Base agent", cache: new CacheHint({ type: "ephemeral", ttlSeconds: 3_600 }) },
+            { type: "text", text: "Project instructions" },
+          ],
+          tools: [{ name: "lookup", description: "Lookup", inputSchema: { type: "object", properties: {} } }],
+          prompt: "Hello",
+          cache: { tools: true, system: true, messages: { tail: 1 } },
+        }),
+      )
+
+      expect(prepared.body).toMatchObject({
+        tools: [{ cache_control: { type: "ephemeral" } }],
+        messages: [
+          {
+            role: "system",
+            content: [
+              { text: "Base agent", cache_control: { type: "ephemeral", ttl: "1h" } },
+              { text: "Project instructions", cache_control: { type: "ephemeral" } },
+            ],
+          },
+          {
+            role: "user",
+            content: [{ text: "Hello", cache_control: { type: "ephemeral" } }],
+          },
+        ],
+      })
+    }),
+  )
+
+  it.effect("lowers manual assistant and tool-result cache hints", () =>
+    Effect.gen(function* () {
+      const prepared = yield* compileRequest(
+        LLM.request({
+          model: OpenRouter.configure({ apiKey: "test-key" }).model("anthropic/claude-sonnet-4.6"),
+          cache: "none",
+          messages: [
+            Message.user("Call the tool"),
+            Message.assistant([
+              { type: "text", text: "Calling", cache: new CacheHint({ type: "ephemeral" }) },
+              { type: "tool-call", id: "call_1", name: "lookup", input: {} },
+            ]),
+            Message.tool({
+              id: "call_1",
+              name: "lookup",
+              result: "Done",
+              cache: new CacheHint({ type: "ephemeral", ttlSeconds: 3_600 }),
+            }),
+          ],
+        }),
+      )
+
+      expect(prepared.body.messages).toMatchObject([
+        { role: "user", content: "Call the tool" },
+        { role: "assistant", content: "Calling", cache_control: { type: "ephemeral" } },
+        { role: "tool", content: '"Done"', cache_control: { type: "ephemeral", ttl: "1h" } },
+      ])
+    }),
+  )
+
+  it.effect("caps manual cache controls at four breakpoints", () =>
+    Effect.gen(function* () {
+      const cache = new CacheHint({ type: "ephemeral" })
+      const prepared = yield* compileRequest(
+        LLM.request({
+          model: OpenRouter.configure({ apiKey: "test-key" }).model("anthropic/claude-sonnet-4.6"),
+          cache: "none",
+          system: [1, 2, 3, 4, 5].map((index) => ({ type: "text" as const, text: `System ${index}`, cache })),
+          prompt: "Hello",
+        }),
+      )
+
+      const system = prepared.body.messages[0]
+      expect(system?.role).toBe("system")
+      expect(
+        system && Array.isArray(system.content)
+          ? system.content.filter((part) => "cache_control" in part && part.cache_control !== undefined)
+          : [],
+      ).toHaveLength(4)
+    }),
+  )
+
+  it.effect("preserves cache policy hints on reasoning-only assistant messages", () =>
+    Effect.gen(function* () {
+      const prepared = yield* compileRequest(
+        LLM.request({
+          model: OpenRouter.configure({ apiKey: "test-key" }).model("anthropic/claude-sonnet-4.6"),
+          cache: { messages: "latest-assistant" },
+          messages: [Message.user("Think"), Message.assistant([{ type: "reasoning", text: "Reasoning" }])],
+        }),
+      )
+
+      expect(prepared.body.messages).toMatchObject([
+        { role: "user", content: "Think" },
+        { role: "assistant", cache_control: { type: "ephemeral" } },
+      ])
+    }),
+  )
+
+  it.effect("allows usage accounting to be disabled explicitly", () =>
+    Effect.gen(function* () {
+      const prepared = yield* compileRequest(
+        LLM.request({
+          model: OpenRouter.configure({
+            apiKey: "test-key",
+            providerOptions: { openrouter: { usage: false } },
+          }).model("openai/gpt-4o-mini"),
+          cache: "none",
+          prompt: "Hello",
+        }),
+      )
+
+      expect(prepared.body.usage).toEqual({ include: false })
+    }),
+  )
+
  it.effect("applies OpenRouter payload options from the model helper", () =>
    Effect.gen(function* () {
      const prepared = yield* compileRequest(
@@ -42,6 +163,13 @@ describe("OpenRouter", () => {
                usage: true,
                reasoning: { effort: "high" },
                promptCacheKey: "session_123",
+                models: ["anthropic/claude-sonnet-4.6", "google/gemini-3.1-pro"],
+                provider: { order: ["anthropic", "google"], require_parameters: true },
+                plugins: [{ id: "response-healing" }],
+                web_search_options: { engine: "native", max_results: 3 },
+                debug: { echo_upstream_body: true },
+                user: "user_123",
+                future_option: { enabled: true },
              },
            },
          }).model("anthropic/claude-3.7-sonnet:thinking"),
@@ -53,10 +181,54 @@ describe("OpenRouter", () => {
        usage: { include: true },
        reasoning: { effort: "high" },
        prompt_cache_key: "session_123",
+        models: ["anthropic/claude-sonnet-4.6", "google/gemini-3.1-pro"],
+        provider: { order: ["anthropic", "google"], require_parameters: true },
+        plugins: [{ id: "response-healing" }],
+        web_search_options: { engine: "native", max_results: 3 },
+        debug: { echo_upstream_body: true },
+        user: "user_123",
+        future_option: { enabled: true },
      })
    }),
  )

+  it.effect("filters invalid known OpenRouter options while preserving extensions", () =>
+    Effect.gen(function* () {
+      const invalid: Record<string, unknown> = {
+        usage: "yes",
+        models: "anthropic/claude-sonnet-4.6",
+        provider: [],
+        plugins: {},
+        web_search_options: [],
+        debug: [],
+        user: 123,
+        reasoning: [],
+        promptCacheKey: 123,
+        future_option: { enabled: true },
+      }
+      const prepared = yield* compileRequest(
+        LLM.request({
+          model: OpenRouter.configure({
+            apiKey: "test-key",
+            providerOptions: { openrouter: invalid },
+          }).model("openai/gpt-4o-mini"),
+          prompt: "Hello",
+        }),
+      )
+
+      expect(prepared.body).toMatchObject({ future_option: { enabled: true } })
+      expect(prepared.body).not.toHaveProperty("usage")
+      expect(prepared.body).not.toHaveProperty("models")
+      expect(prepared.body).not.toHaveProperty("provider")
+      expect(prepared.body).not.toHaveProperty("plugins")
+      expect(prepared.body).not.toHaveProperty("web_search_options")
+      expect(prepared.body).not.toHaveProperty("debug")
+      expect(prepared.body).not.toHaveProperty("user")
+      expect(prepared.body).not.toHaveProperty("reasoning")
+      expect(prepared.body).not.toHaveProperty("prompt_cache_key")
+    }),
+  )
+
  it.effect("preserves the upstream provider finish reason", () =>
    Effect.gen(function* () {
      const model = OpenRouter.configure({ apiKey: "test-key" }).model("anthropic/claude-sonnet-4.6")
@@ -104,6 +276,7 @@ describe("OpenRouter", () => {
      const prepared = yield* compileRequest(
        LLM.request({
          model: OpenRouter.configure({ apiKey: "test-key" }).model("anthropic/claude-sonnet-4.6"),
+          cache: "none",
          messages: [
            Message.assistant([
              {
@@ -137,6 +310,7 @@ describe("OpenRouter", () => {
      const prepared = yield* compileRequest(
        LLM.request({
          model: OpenRouter.configure({ apiKey: "test-key" }).model("anthropic/claude-sonnet-4.6"),
+          cache: "none",
          messages: [
            Message.assistant({
              type: "reasoning",
@@ -162,6 +336,7 @@ describe("OpenRouter", () => {
      const prepared = yield* compileRequest(
        LLM.request({
          model: OpenRouter.configure({ apiKey: "test-key" }).model("anthropic/claude-sonnet-4.6"),
+          cache: "none",
          messages: [
            Message.assistant({
              type: "reasoning",
@@ -183,6 +358,7 @@ describe("OpenRouter", () => {
      const prepared = yield* compileRequest(
        LLM.request({
          model: OpenRouter.configure({ apiKey: "test-key" }).model("anthropic/claude-sonnet-4.6"),
+          cache: "none",
          messages: [Message.assistant({ type: "reasoning", text: "Thinking" })],
        }),
      )
@@ -1,6 +1,6 @@
 import { describe, expect } from "bun:test"
 import { Effect, Schema, Stream } from "effect"
-import { LLM, LLMResponse, Message, ToolDefinition, type Model } from "../../src"
+import { LLM, LLMResponse, Message, ToolDefinition, type LanguageModel } from "../../src"
 import { AmazonBedrock, Anthropic, Google, OpenAI, XAI } from "../../src/providers"
 import { LLMClient } from "../../src/route"
 import { Tool } from "../../src/tool"
@@ -28,7 +28,7 @@ const targets: ReadonlyArray<{
  readonly requires: string
  readonly filename: string
  readonly maxTokens: number
-  readonly model: Model
+  readonly model: LanguageModel
 }> = [
  {
    id: "openai",
@@ -1,7 +1,7 @@
 import type { HttpRecorder } from "@opencode-ai/http-recorder"
 import { describe } from "bun:test"
 import { Effect } from "effect"
-import type { Model } from "../src"
+import type { LanguageModel } from "../src"
 import { goldenScenarioTags, goldenScenarioTitle, runGoldenScenario, type GoldenScenarioID } from "./recorded-scenarios"
 import { recordedTests } from "./recorded-test"
 import { kebab } from "./recorded-utils"
@@ -22,7 +22,7 @@ type ScenarioInput =

 type TargetInput = {
  readonly name: string
-  readonly model: Model
+  readonly model: LanguageModel
  readonly protocol?: string
  readonly requires?: ReadonlyArray<string>
  readonly transport?: Transport
@@ -12,7 +12,7 @@ import {
  toDefinitions,
  type ContentPart,
  type FinishReason,
-  type Model,
+  type LanguageModel,
 } from "../src"
 import { LLMClient } from "../src/route"
 import { Tool } from "../src/tool"
@@ -54,7 +54,7 @@ export const weatherRuntimeTool = Tool.make({

 export const weatherToolLoopRequest = (input: {
  readonly id: string
-  readonly model: Model
+  readonly model: LanguageModel
  readonly system?: string
  readonly maxTokens?: number
  readonly temperature?: number | false
@@ -73,7 +73,7 @@ export const weatherToolLoopRequest = (input: {

 export const goldenWeatherToolLoopRequest = (input: {
  readonly id: string
-  readonly model: Model
+  readonly model: LanguageModel
  readonly maxTokens?: number
  readonly temperature?: number | false
 }) =>
@@ -163,7 +163,7 @@ export const expectGoldenWeatherToolLoop = (events: ReadonlyArray<LLMEvent>) =>

 export interface GoldenScenarioContext {
  readonly id: string
-  readonly model: Model
+  readonly model: LanguageModel
  readonly maxTokens?: number
  readonly temperature?: number | false
 }
@@ -1,11 +1,21 @@
 import { describe, expect, test } from "bun:test"
-import { Schema } from "effect"
+import { Effect, Schema } from "effect"
 import * as OpenAIChat from "../src/protocols/openai-chat"
 import * as OpenAIResponses from "../src/protocols/openai-responses"
-import { ContentPart, LLMEvent, LLMRequest, Model, ModelID, ProviderID, Usage } from "../src/schema"
+import {
+  AIError,
+  ContentPart,
+  InvalidRequestReason,
+  LLMEvent,
+  LLMRequest,
+  LanguageModel,
+  ModelID,
+  ProviderID,
+  Usage,
+} from "../src/schema"
 import { ProviderShared } from "../src/protocols/shared"

-const model = new Model({
+const model = new LanguageModel({
  id: ModelID.make("fake-model"),
  provider: ProviderID.make("fake-provider"),
  route: OpenAIChat.route,
@@ -33,7 +43,7 @@ describe("llm schema", () => {

  test("accepts custom route ids", () => {
    const decoded = decodeLLMRequest({
-      model: Model.update(model, { route: OpenAIResponses.route }),
+      model: LanguageModel.update(model, { route: OpenAIResponses.route }),
      system: [],
      messages: [],
      tools: [],
@@ -51,9 +61,7 @@ describe("llm schema", () => {
    expect(
      LLMEvent.stepFinish({ index: 0, reason: { normalized: "stop" }, usage: { inputTokens: 1 } }).usage,
    ).toBeInstanceOf(Usage)
-    expect(LLMEvent.finish({ reason: { normalized: "stop" }, usage: { outputTokens: 2 } }).usage).toBeInstanceOf(
-      Usage,
-    )
+    expect(LLMEvent.finish({ reason: { normalized: "stop" }, usage: { outputTokens: 2 } }).usage).toBeInstanceOf(Usage)
  })

  test("content part tagged union exposes guards", () => {
@@ -62,7 +70,7 @@ describe("llm schema", () => {
  })
 })

-describe("LLM.Usage", () => {
+describe("AI.Usage", () => {
  test("subtractTokens clamps non-sensical breakdowns to zero", () => {
    // Defense against a provider reporting cached_tokens > prompt_tokens or
    // reasoning_tokens > completion_tokens — the negative would otherwise
@@ -88,3 +96,15 @@ describe("LLM.Usage", () => {
    expect(new Usage({}).visibleOutputTokens).toBe(0)
  })
 })
+
+test("AI errors expose the shared runtime tag", async () => {
+  const error = new AIError({
+    module: "test",
+    method: "call",
+    reason: new InvalidRequestReason({ message: "invalid" }),
+  })
+  expect(error._tag).toBe("AI.Error")
+  expect(
+    await Effect.runPromise(Effect.fail(error).pipe(Effect.catchTag("AI.Error", () => Effect.succeed("caught")))),
+  ).toBe("caught")
+})
@@ -1,6 +1,6 @@
 import { describe, expect } from "bun:test"
 import { Effect } from "effect"
-import { LLMError } from "../src/schema"
+import { AIError } from "../src/schema"
 import { ToolStream } from "../src/protocols/utils/tool-stream"
 import { it } from "./lib/effect"

@@ -67,7 +67,7 @@ describe("ToolStream", () => {
    Effect.gen(function* () {
      const error = ToolStream.appendExisting(ADAPTER, ToolStream.empty<number>(), 0, "{}", "missing tool")

-      expect(error).toBeInstanceOf(LLMError)
+      expect(error).toBeInstanceOf(AIError)
      if (ToolStream.isError(error)) expect(error.reason.message).toBe("missing tool")
    }),
  )
@@ -59,6 +59,7 @@
    "@opencode-ai/sdk": "file:vendor/opencode-ai-sdk-1.18.8-dev.tgz",
    "@opencode-ai/session-ui": "workspace:*",
    "@opencode-ai/ui": "workspace:*",
+    "@opencode-ai/util": "workspace:*",
    "@pierre/trees": "1.0.0-beta.4",
    "@sentry/solid": "catalog:",
    "@shikijs/transformers": "3.9.2",
@@ -4,6 +4,7 @@ import { createResizeObserver } from "@solid-primitives/resize-observer"
 import { createMutation } from "@tanstack/solid-query"
 import { IconButtonV2 } from "@opencode-ai/ui/v2/icon-button-v2"
 import { Icon as IconV2 } from "@opencode-ai/ui/v2/icon"
+import { displayLabel } from "@opencode-ai/util/session-title-fallback"
 import { useGlobal } from "@/context/global"
 import { ServerConnection, serverName } from "@/context/server"
 import { displayName, projectForSession } from "@/pages/layout/helpers"
@@ -54,7 +55,10 @@ export function TabNavItem(props: {
    if (!session) return
    return projectForSession(session, serverCtx()?.projects.list() ?? [])
  })
-  const title = createMemo(() => props.session()?.title ?? props.fallbackTitle)
+  const title = createMemo(() => {
+    const session = props.session()
+    return session ? displayLabel(session) : props.fallbackTitle
+  })

  const projectName = createMemo(() => {
    const session = props.session()
@@ -143,7 +147,7 @@ export function TabNavItem(props: {
    if (!canOpenTabRename(props.dragging, editing(), rename.isPending)) return
    const session = props.session()
    if (!session) return
-    titleEl.textContent = session.title
+    titleEl.textContent = session.title ?? ""
    setEditing(true)

    requestAnimationFrame(() => {
@@ -302,7 +306,7 @@ export function TabNavItem(props: {
      }}
      data={{
        projectName: projectName(),
-        title: props.session()?.title,
+        title: title(),
        path: previewPath(),
        serverName: serverLabel(),
      }}
@@ -129,8 +129,8 @@ export const loadProjectsQuery = (scope: ServerScope, api: ProjectApi) =>
        api.list().then((projects) => {
          return projects
            .filter((p) => !!p?.id)
-            .filter((p) => !!p.worktree && !p.worktree.includes("opencode-test"))
            .map(normalizeProjectInfo)
+            .filter((p) => !!p.worktree && !p.worktree.includes("opencode-test"))
            .slice()
            .sort((a, b) => cmp(a.id, b.id))
        }),
@@ -168,6 +168,7 @@ export function sanitizeProject(project: Project) {
 export function normalizeProjectInfo(project: Project | CurrentProject): Project {
  return {
    ...project,
+    worktree: "canonical" in project ? project.canonical : project.worktree,
    vcs: project.vcs === "git" ? "git" : undefined,
  }
 }
@@ -3,6 +3,7 @@ import { useLanguage } from "@/context/language"
 import { serverName } from "@/context/server"
 import { displayName } from "@/pages/layout/helpers"
 import { makeEventListener } from "@solid-primitives/event-listener"
+import { displayLabel } from "@opencode-ai/util/session-title-fallback"
 import { createMemo, onCleanup } from "solid-js"
 import { createStore } from "solid-js/store"
 import type { HomeController } from "./home-controller"
@@ -23,7 +24,7 @@ export function createHomeSessionSearchController(home: HomeController, sessions
    if (!value) return []
    return sessions.data
      .searchRecords()
-      .filter((record) => `${record.session.title} ${record.projectName}`.toLowerCase().includes(value))
+      .filter((record) => `${displayLabel(record.session)} ${record.projectName}`.toLowerCase().includes(value))
  })
  const active = createMemo(() => {
    const records = results()
@@ -6,10 +6,10 @@ import { ButtonV2 } from "@opencode-ai/ui/v2/button-v2"
 import { Icon as IconV2 } from "@opencode-ai/ui/v2/icon"
 import { IconButtonV2 } from "@opencode-ai/ui/v2/icon-button-v2"
 import { TooltipV2 } from "@opencode-ai/ui/v2/tooltip-v2"
+import { displayLabel } from "@opencode-ai/util/session-title-fallback"
 import { useLanguage } from "@/context/language"
 import { ServerConnection } from "@/context/server"
 import { SessionTabAvatarView } from "@/pages/layout/session-tab-avatar"
-import { sessionTitle } from "@/utils/session-title"
 import { shouldOpenSessionInBackground } from "../home-session-open"
 import {
  HomeSessionStatusController,
@@ -344,7 +344,7 @@ function HomeSessionSearchResultRow(
    selected: boolean
  },
 ) {
-  const title = createMemo(() => sessionTitle(props.record.session.title) || props.record.session.id)
+  const title = createMemo(() => displayLabel(props.record.session))
  const showProjectName = () => props.showProjectName() && props.record.projectName
  const key = () => homeSessionSearchKey(props.record)

@@ -415,7 +415,7 @@ function HomeSessionGroupHeader(props: {
 }

 function HomeSessionRow(props: HomeSessionsViewProps & { record: HomeSessionRecord }) {
-  const title = createMemo(() => sessionTitle(props.record.session.title) || props.record.session.id)
+  const title = createMemo(() => displayLabel(props.record.session))
  const showProjectName = () => props.showProjectName() && props.record.projectName

  return (
@@ -5,6 +5,7 @@ import { Icon as IconV2 } from "@opencode-ai/ui/v2/icon"
 import { IconButton } from "@opencode-ai/ui/icon-button"
 import { Spinner } from "@opencode-ai/ui/spinner"
 import { Tooltip } from "@opencode-ai/ui/tooltip"
+import { displayLabel } from "@opencode-ai/util/session-title-fallback"
 import { getFilename } from "@opencode-ai/core/util/path"
 import { A, useParams } from "@solidjs/router"
 import { type Accessor, createMemo, For, type JSX, Match, Show, Switch } from "solid-js"
@@ -14,7 +15,6 @@ import { getAvatarColors, type LocalProject, useLayout } from "@/context/layout"
 import { useNotification } from "@/context/notification"
 import { usePermission } from "@/context/permission"
 import { messageAgentColor } from "@/utils/agent"
-import { sessionTitle } from "@/utils/session-title"
 import { sessionPermissionRequest } from "../session/composer/session-request-tree"
 import { childSessionOnPath, getProjectAvatarSource, hasProjectPermissions } from "./helpers"

@@ -104,7 +104,7 @@ const SessionRow = (props: {
  warmPress: () => void
  warmFocus: () => void
 }): JSX.Element => {
-  const title = () => sessionTitle(props.session.title)
+  const title = () => displayLabel(props.session)

  return (
    <A
@@ -229,7 +229,7 @@ export const SessionItem = (props: SessionItemProps): JSX.Element => {
              fallback={
                <Tooltip
                  placement={props.mobile ? "bottom" : "right"}
-                  value={sessionTitle(props.session.title)}
+                  value={displayLabel(props.session)}
                  gutter={10}
                  class="min-w-0 w-full"
                >
@@ -70,7 +70,7 @@ import { legacySessionHref, requireServerKey, sessionHref } from "@/utils/sessio
 import { useSDK } from "@/context/sdk"
 import { useSync } from "@/context/sync"
 import { notifySessionTabsRemoved } from "@/components/titlebar-session-events"
-import { sessionTitle } from "@/utils/session-title"
+import { displayLabel } from "@opencode-ai/util/session-title-fallback"
 import { scheduleConnectedMeasure } from "./measure"
 import { observeElementOffsetReconnectAware } from "./observe-element-offset"
 import { createTimelineProjection } from "./projection"
@@ -296,8 +296,11 @@ export function MessageTimeline(props: {
    if (!id) return
    return sync().session.get(id)
  })
-  const titleValue = createMemo(() => info()?.title)
-  const titleLabel = createMemo(() => sessionTitle(titleValue()))
+  const titleLabel = createMemo(() => {
+    const session = info()
+    if (!session) return
+    return displayLabel(session)
+  })
  const shareUrl = createMemo(() => info()?.share?.url)
  const shareEnabled = createMemo(() => sync().data.config.share !== "disabled")
  const parentID = createMemo(() => info()?.parentID)
@@ -311,7 +314,10 @@ export function MessageTimeline(props: {
    if (!id) return emptyMessages
    return sync().data.message[id] ?? emptyMessages
  })
-  const parentTitle = createMemo(() => sessionTitle(parent()?.title) ?? language.t("command.session.new"))
+  const parentTitle = createMemo(() => {
+    const session = parent()
+    return session ? displayLabel(session) : language.t("command.session.new")
+  })
  const getMsgParts = (msgId: string) => sync().data.part[msgId] ?? emptyParts
  const getMsgPart = (messageID: string, partID: string) => getMsgParts(messageID).find((part) => part.id === partID)
  const childTaskDescription = createMemo(() => {
@@ -329,7 +335,7 @@ export function MessageTimeline(props: {
    if (value) return value
    return language.t("command.session.new")
  })
-  const showHeader = createMemo(() => !!(titleValue() || parentID()))
+  const showHeader = createMemo(() => !!(titleLabel() || parentID()))
  const projection = createTimelineProjection({
    messages: sessionMessages,
    userMessages: () => props.userMessages,
@@ -912,9 +918,10 @@ export function MessageTimeline(props: {
  }

  function DialogDeleteSession(props: { sessionID: string }) {
-    const name = createMemo(
-      () => sessionTitle(sync().session.get(props.sessionID)?.title) ?? language.t("command.session.new"),
-    )
+    const name = createMemo(() => {
+      const session = sync().session.get(props.sessionID)
+      return session ? displayLabel(session) : language.t("command.session.new")
+    })
    const handleDelete = async () => {
      await deleteSession(props.sessionID)
      dialog.close()
@@ -38,17 +38,19 @@ test("reports a divergent native offset once and ignores equal offsets and unrel
    instance.scrollOffset = offset
  })

-  document.body.append(unrelated)
-  unrelated.remove()
-  await frames(2)
-  expect(calls).toEqual([])
-
  route.remove()
  document.body.append(route)
  await new Promise((resolve) => setTimeout(resolve, 0))
  await frames(3)
  expect(calls).toEqual([[0, false]])

+  instance.scrollOffset = 79_400
+  document.body.append(unrelated)
+  unrelated.remove()
+  await frames(2)
+  expect(calls).toEqual([[0, false]])
+
+  instance.scrollOffset = 0
  route.remove()
  document.body.append(route)
  await new Promise((resolve) => setTimeout(resolve, 0))
@@ -128,7 +128,7 @@ function createV1Api(input: CompatibleInput): CompatibleApi {
  const located = <T>(data: T, value?: { directory?: string }) => ({
    location: {
      directory: directory(value) ?? "",
-      project: { id: "", directory: directory(value) ?? "" },
+      project: { id: "", directory: directory(value) ?? "", canonical: directory(value) ?? "" },
    },
    data,
  })
@@ -298,12 +298,19 @@ function createV1Api(input: CompatibleInput): CompatibleApi {
    project: {
      ...input.current.project,
      async list() {
-        return ((await legacy().project.list()).data ?? []) as Project[]
+        return ((await legacy().project.list()).data ?? []).map((project) => ({
+          ...project,
+          canonical: project.worktree,
+        }))
      },
      async current(value?: Parameters<ServerApi["project"]["current"]>[0]) {
        const result = await legacy(value?.location).project.current()
        if (!result.data) throw new Error("Project not found")
-        return { id: result.data.id, directory: result.data.worktree } satisfies ProjectCurrent
+        return {
+          id: result.data.id,
+          directory: result.data.worktree,
+          canonical: result.data.worktree,
+        } satisfies ProjectCurrent
      },
      // async update(value: Parameters<ServerApi["project"]["update"]>[0]) {
      //   const project = (await legacy().project.list()).data?.find((item) => item.id === value.projectID)
@@ -1,7 +0,0 @@
-const pattern = /^(New session|Child session) - \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z$/
-
-export function sessionTitle(title?: string) {
-  if (!title) return title
-  const match = title.match(pattern)
-  return match?.[1] ?? title
-}
@@ -1,5 +1,6 @@
 import type { SessionApi, SessionInfo, SessionListInput } from "@opencode-ai/client/promise"
 import type { Session } from "@opencode-ai/sdk/v2/client"
+import { withTimestampedFallback } from "@opencode-ai/util/session-title-fallback"

 export function normalizeSessionInfo(input: SessionInfo | Session): Session {
  if (!("location" in input)) return input
@@ -13,7 +14,7 @@ export function normalizeSessionInfo(input: SessionInfo | Session): Session {
    parentID: input.parentID,
    cost: input.cost,
    tokens: input.tokens,
-    title: input.title,
+    title: withTimestampedFallback(input),
    agent: input.agent,
    model: input.model,
    version: "",
@@ -40,6 +40,9 @@
    "open": "10.1.2",
    "semver": "catalog:",
    "solid-js": "catalog:",
+    "tree-sitter-bash": "0.25.0",
+    "tree-sitter-powershell": "0.25.10",
+    "web-tree-sitter": "0.25.10",
    "uqr": "0.1.3",
    "ws": "8.21.0"
  },
@@ -62,8 +62,8 @@ for (const target of targets) {
  await rm("dist-node", { recursive: true, force: true })
  const assetHash = await hashNodeAssets(assets)
  const input = { version: Script.version, channel: Script.channel, models: modelsData, assetHash, target }
-  await build(mainConfig(input))
  await copyNodeAssets(assets)
+  await build(mainConfig(input))

  const host = target.platform === process.platform && target.arch === process.arch
  if (host) {
@@ -3,7 +3,7 @@ import { copyFile, mkdir, readdir, readFile, stat } from "node:fs/promises"
 import path from "node:path"
 import { fileURLToPath } from "node:url"
 import { getNodeAssets } from "@opentui/core/node-assets"
-import { attentionSoundAssets, type NodeTarget, photonWasmAsset } from "../src/node/target"
+import { attentionSoundAssets, type NodeTarget, photonWasmAsset, shellParserWasmAssets } from "../src/node/target"

 const dir = path.resolve(import.meta.dirname, "..")

@@ -43,6 +43,10 @@ export async function collectNodeAssets(target: NodeTarget) {
      key: photonWasmAsset,
      source: fileURLToPath(import.meta.resolve(photonWasmAsset)),
    },
+    ...Object.values(shellParserWasmAssets).map((key) => ({
+      key,
+      source: fileURLToPath(import.meta.resolve(key)),
+    })),
    ...attentionSoundAssets.map((key) => ({
      key,
      source: path.resolve(dir, "../ui/src/assets/audio", path.basename(key)),
@@ -54,8 +58,9 @@ export async function collectNodeAssets(target: NodeTarget) {
        source: path.join(ptyRoot, relative),
      })),
  ]
-  await Promise.all(assets.map((asset) => stat(asset.source)))
-  return assets
+  const unique = [...new Map(assets.map((asset) => [asset.key, asset])).values()]
+  await Promise.all(unique.map((asset) => stat(asset.source)))
+  return unique
 }

 export async function hashNodeAssets(assets: readonly NodeAsset[]) {
@@ -8,6 +8,7 @@ import {
  type SessionMessageInfo,
  type SkillInfo,
 } from "@opencode-ai/client/promise"
+import { withTimestampedFallback } from "@opencode-ai/util/session-title-fallback"
 import type {
  AgentSideConnection,
  AuthenticateRequest,
@@ -213,7 +214,7 @@ export function make(input: { readonly client: OpenCodeClient; readonly connecti
        sessions: page.data.map((session) => ({
          sessionId: session.id,
          cwd: session.location.directory,
-          title: session.title,
+          title: withTimestampedFallback(session),
          updatedAt: new Date(session.time.updated).toISOString(),
        })),
        ...(page.cursor.next ? { nextCursor: page.cursor.next } : {}),
@@ -133,7 +133,6 @@ export const Commands = Spec.make(typeof OPENCODE_CLI_NAME === "string" ? OPENCO
      description: "Manage plugins",
      commands: [Spec.make("list", { description: "List active plugins" })],
    }),
-    Spec.make("migrate", { description: "Migrate v1 data to v2" }),
    Spec.make("mini", {
      description: "Start the minimal interactive interface",
      params: {
@@ -1,5 +0,0 @@
-import { Effect } from "effect"
-import { Commands } from "../commands"
-import { Runtime } from "../../framework/runtime"
-
-export default Runtime.handler(Commands.commands.migrate, (_input) => Effect.log("No migrations to run."))
@@ -116,13 +116,6 @@ export function migrateV1(legacy: TuiConfigV1.Info | undefined, kv: Record<strin
              : { grouping: kv.exploration_grouping ? ("auto" as const) : ("none" as const) }),
          },
        }),
-    ...(kv.dismissed_getting_started === undefined
-      ? {}
-      : {
-          hints: {
-            onboarding: !kv.dismissed_getting_started,
-          },
-        }),
    ...(kv.animations_enabled === undefined ? {} : { animations: kv.animations_enabled }),
    ...(legacy?.mouse === undefined ? {} : { mouse: legacy.mouse }),
  }
@@ -35,7 +35,6 @@ const Handlers = Runtime.handlers(Commands, {
  plugin: {
    list: () => import("./commands/handlers/plugin/list"),
  },
-  migrate: () => import("./commands/handlers/migrate"),
  mini: () => import("./commands/handlers/mini"),
  run: () => import("./commands/handlers/run"),
  pair: () => import("./commands/handlers/pair"),
@@ -29,6 +29,11 @@ export function nodeTarget(platform: string, arch: string) {
 }

 export const photonWasmAsset = "@silvia-odwyer/photon-node/photon_rs_bg.wasm"
+export const shellParserWasmAssets = {
+  runtime: "web-tree-sitter/tree-sitter.wasm",
+  bash: "tree-sitter-bash/tree-sitter-bash.wasm",
+  powershell: "tree-sitter-powershell/tree-sitter-powershell.wasm",
+} as const
 export const nodeExecArgv = ["--experimental-ffi", "--use-system-ca", "--disable-warning=ExperimentalWarning"] as const

 export const attentionSoundAssets = [
@@ -235,10 +235,6 @@ async function renderToolError(part: SessionMessageAssistantTool, directory: str
  UI.println(UI.Style.TEXT_NORMAL + "✗", UI.Style.TEXT_NORMAL + `${info.title} failed`)
 }

-function warning(message: string) {
-  UI.println(UI.Style.TEXT_WARNING_BOLD + "!", UI.Style.TEXT_NORMAL, message)
-}
-
 function errorMessage(error: unknown) {
  if (error instanceof Error) return error.message
  if (typeof error === "object" && error !== null && "message" in error && typeof error.message === "string")
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Aiden Cline	6ea55e63ad	refactor(ai): align multimodal naming	2026-08-01 11:35:11 -05:00
Aiden Cline	003b22edda	fix: preserve provider error status (#39976 )	2026-08-01 11:06:00 -05:00
Kit Langton	d5f6c088f0	fix(tui): prevent sidebar scrollbar flash (#40056 )	2026-08-01 15:12:37 +00:00
Kit Langton	e872bd3c8f	feat(tui): prioritize favorite model search results (#40049 )	2026-08-01 14:54:46 +00:00
opencode-agent[bot]	85ea15e56d	test(tui): wait for mini prompt readiness (#39980 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-08-01 01:05:18 +00:00
Kit Langton	6a543791b6	fix(tui): persist tab reorder once per drag (#39942 )	2026-07-31 20:36:00 -04:00
Kit Langton	47c6840752	fix(tui): harden session tab state hygiene (#39941 )	2026-07-31 20:35:07 -04:00
Kit Langton	14e4c3dfd7	fix(tui): ignore hidden tab close hitbox (#39940 )	2026-07-31 20:34:13 -04:00
opencode-agent[bot]	ee6577936d	refactor(tui): remove unused duration formatter (#39964 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:32:46 -04:00
opencode-agent[bot]	8285a18f18	refactor(tui): remove unused revert diff parser (#39963 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:32:35 -04:00
opencode-agent[bot]	cfcd8de62a	refactor(cli): remove unused warning helper (#39962 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:32:21 -04:00
opencode-agent[bot]	c2db18c59b	refactor(tui): remove unwired file selection helper (#39961 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:31:50 -04:00
opencode-agent[bot]	70393a1d18	Remove unused error data serializer (#39960 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:31:22 -04:00
opencode-agent[bot]	eab59ea021	Remove unused locale helpers (#39959 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:31:06 -04:00
opencode-agent[bot]	4569659b03	Remove unused Zed helpers (#39958 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:30:53 -04:00
opencode-agent[bot]	b5afaed053	Remove unused config optional hook (#39957 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:30:29 -04:00
opencode-agent[bot]	97f5fb3399	Remove unused subagent retry formatter (#39952 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:30:20 -04:00
opencode-agent[bot]	18843682ad	refactor(tui): remove ignored attention kv option (#39956 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:30:09 -04:00
opencode-agent[bot]	9eb9c1db7d	refactor(tui): remove placeholder LSP panel (#39955 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:29:54 -04:00
opencode-agent[bot]	8846336e11	refactor(tui): remove unused fade file path (#39954 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:29:34 -04:00
opencode-agent[bot]	f6b5f6b6b3	refactor(tui): remove prompt re-export barrels (#39953 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:29:27 -04:00
opencode-agent[bot]	02df1e9737	refactor(tui): reuse canonical logo (#39951 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:28:55 -04:00
opencode-agent[bot]	5b84e39f6d	refactor(tui): remove stub child cycling commands (#39949 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:28:23 -04:00
opencode-agent[bot]	6d3f84b4ff	refactor(tui): remove dialog show helpers (#39948 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:28:02 -04:00
opencode-agent[bot]	255e9bbf06	refactor(tui): remove onboarding hint residue (#39947 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:27:52 -04:00
opencode-agent[bot]	25b6a179e2	refactor(cli): remove no-op migrate command (#39946 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:27:29 -04:00
opencode-agent[bot]	80874c241f	refactor(tui): remove dead assistant renderer (#39945 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:27:15 -04:00
opencode-agent[bot]	f99469bdf8	refactor(core): remove unused layer exports (#39975 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:26:38 -04:00
opencode-agent[bot]	fe0eb4ea8f	refactor(core): remove orphaned move service (#39974 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:26:21 -04:00
opencode-agent[bot]	a484f87680	refactor(core): remove unused dependencies (#39973 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:26:06 -04:00
opencode-agent[bot]	3b6ab392ac	refactor(core): remove unused console state model (#39972 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:25:45 -04:00
opencode-agent[bot]	6c567dc745	refactor(core): remove unreferenced layer map example (#39971 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:25:27 -04:00
opencode-agent[bot]	92567700f6	refactor(tui): remove unused stop voice operation (#39969 ) Co-authored-by: Kit Langton <kit.langton@gmail.com>	2026-07-31 20:25:17 -04:00
James Long	90c84639e3	feat(theme): export expandTheme (#39967 )	2026-07-31 18:32:55 -04:00
opencode-agent[bot]	56c6add5c3	refactor(core): remove unused helpers (#39943 ) Co-authored-by: Aiden Cline <rekram1-node@users.noreply.github.com>	2026-07-31 16:17:14 -05:00
Kit Langton	2cfe8883ea	feat(plugin): expose session rename and wait to plugins (#39932 )	2026-07-31 21:08:33 +00:00
Kit Langton	102086c50f	feat(tui): hot-reload local TUI plugins (#39776 )	2026-07-31 16:35:05 -04:00
Kit Langton	06e26d89ad	feat(protocol): accept title on session create (#39935 )	2026-07-31 19:39:54 +00:00
Aiden Cline	84dd56ed34	fix(core): bound outbound image history (#39929 )	2026-07-31 13:57:04 -05:00
opencode-agent[bot]	f92e490bb6	fix(tui): preserve diff hunk boundaries (#39693 ) Co-authored-by: James Long <17031+jlongster@users.noreply.github.com>	2026-07-31 14:47:36 -04:00
Kit Langton	0481dba88e	fix(tui): improve narrow layouts (#39918 )	2026-07-31 14:44:13 -04:00
Kit Langton	dd0e41c633	fix(tui): render plugin slots and routes with component semantics (#39917 )	2026-07-31 14:30:57 -04:00
opencode-agent[bot]	b69e51d835	refactor(ai): simplify provider options (#39924 ) Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>	2026-07-31 13:27:32 -05:00
opencode-agent[bot]	e60e8d9387	refactor(core): rename attachments config to media (#39927 ) Co-authored-by: Aiden Cline <rekram1-node@users.noreply.github.com>	2026-07-31 13:26:53 -05:00
Kit Langton	3bfce3fd2d	feat(tui): expand pasted text (#39920 )	2026-07-31 18:17:35 +00:00
Aiden Cline	b498a5c6c4	feat(ai): expand OpenRouter native support (#39907 )	2026-07-31 12:57:18 -05:00
Kit Langton	db9e942398	fix(core): resize large image attachments (#39919 )	2026-07-31 13:24:05 -04:00
Kit Langton	0e26116f68	fix(tui): stabilize open picker	2026-07-31 16:38:48 +00:00
Aiden Cline	3468aa0140	feat(ai): configure chat max tokens field (#39909 )	2026-07-31 11:14:08 -05:00
Kit Langton	7757f712a2	test(app): restore stable offset observer ordering (#39901 )	2026-07-31 12:13:16 -04:00
Aiden Cline	7129ed6e62	fix(core): respect model input limits (#39797 )	2026-07-31 10:41:36 -05:00
Kit Langton	6c37842520	fix(cli): deduplicate Node asset destinations (#39900 )	2026-07-31 11:40:38 -04:00
Kit Langton	dc3c996892	fix(tui): stabilize generated session titles (#39894 )	2026-07-31 11:13:25 -04:00
Kit Langton	7fd12c560c	fix(tui): fit project paths in open menu (#39887 )	2026-07-31 11:07:12 -04:00
Kit Langton	7aaf4e7750	refactor(session): centralize fallback title policy (#39890 )	2026-07-31 10:56:38 -04:00
Kit Langton	1311d909a7	fix(tui): preserve session location during handoff (#39886 )	2026-07-31 10:54:36 -04:00
Kit Langton	d07d9ae0da	fix(tui): remove shells from their location (#39885 )	2026-07-31 10:46:43 -04:00
Kit Langton	1d18459cdc	fix(tui): align session picker scope (#39784 )	2026-07-31 10:32:16 -04:00
Kit Langton	db45026c6c	fix(tui): default tabs to global scope (#39783 )	2026-07-31 10:15:53 -04:00
Kit Langton	77df98db51	Revert "feat(tui): delete current session (#39750 )" This reverts commit `7814568ba0`.	2026-07-31 10:01:35 -04:00
Aiden Cline	ff2b184af1	feat(ai): support Gemini thinking levels (#39796 )	2026-07-30 23:38:00 -05:00
Aiden Cline	671e164f8d	refactor(core): contain Codex in OpenAI plugin (#39734 )	2026-07-30 21:43:38 -05:00
Aiden Cline	5b4ebf3e9d	fix(core): map xAI native options (#39787 )	2026-07-30 21:42:53 -05:00
Aiden Cline	98229d466d	feat(plugin): add session request hook (#39764 )	2026-07-30 21:11:22 -05:00
Kit Langton	5c7e2b5042	fix(tui): clarify open menu project labels (#39780 )	2026-07-30 21:34:29 -04:00
Kit Langton	0a6a5d3e80	fix(session): retry failed title generation (#39748 )	2026-07-30 21:26:44 -04:00
Kit Langton	eb95bd27fe	feat(session): make generated titles optional (#39747 )	2026-07-30 21:24:34 -04:00
Kit Langton	865f512a44	fix(tui): preserve current selection across list updates (#39774 )	2026-07-31 00:48:51 +00:00
Kit Langton	a460f02f67	feat(tui): inherit session directory when creating a new session (#39753 )	2026-07-30 20:31:38 -04:00
Kit Langton	146fdb9de1	feat(tui): add open menu for sessions and projects (#39752 )	2026-07-30 20:08:12 -04:00
Kit Langton	b866900417	fix(tui): name deleted session in toast (#39768 )	2026-07-30 19:59:27 -04:00
Kit Langton	8e3e94aa26	fix(tui): focus palette settings after layout (#39585 )	2026-07-30 19:39:16 -04:00
Aiden Cline	cc1289048e	refactor(core): isolate AI SDK native mappings (#39761 )	2026-07-30 18:38:29 -05:00
Kit Langton	7814568ba0	feat(tui): delete current session (#39750 )	2026-07-30 17:06:41 -04:00
Kit Langton	16b247f756	fix(tui): smooth new session tab handoff (#39745 )	2026-07-30 16:17:01 -04:00
Kit Langton	9abd9594de	fix(simulation): mirror kitty keyboard protocol (#39741 )	2026-07-30 20:03:21 +00:00
Kit Langton	22d2012f75	fix(tui): register storybook only for story runs (#39733 )	2026-07-30 15:55:05 -04:00
Kit Langton	cc883058df	feat(tui): reopen closed session tabs (#39731 )	2026-07-30 15:54:43 -04:00
Kit Langton	8ebc4c6f85	fix(tui): call session tabs just tabs (#39730 )	2026-07-30 15:52:58 -04:00
Kit Langton	b0ed9990b3	feat(tui): add option tab shortcuts (#39725 )	2026-07-30 15:51:10 -04:00
Kit Langton	e1c04dcce6	feat(tui): add temporary new session tab (#39735 )	2026-07-30 15:05:34 -04:00
Kit Langton	188c642d8c	refactor(tui): flatten project picker list (#39726 )	2026-07-30 14:18:16 -04:00
Kit Langton	9d55b223bb	fix(core): stop repository discovery at nearest marker (#39714 )	2026-07-30 13:28:29 -04:00
Kit Langton	ce7a7e4e23	fix(tui): truncate project picker paths (#39678 )	2026-07-30 13:13:31 -04:00
Kit Langton	cba5ba03e3	fix(tui): show shells from session location (#39691 )	2026-07-30 13:12:01 -04:00
Kit Langton	49081a4e24	fix(tui): flash tabs on prompt admission (#39702 )	2026-07-30 16:57:36 +00:00
opencode-agent[bot]	d6371f2fcd	fix(session): update activity on prompt (#39539 ) Co-authored-by: James Long <17031+jlongster@users.noreply.github.com>	2026-07-30 16:28:10 +00:00
Aiden Cline	7625cbdf47	feat(core): route providers through native AI (#39615 )	2026-07-30 11:26:18 -05:00
opencode-agent[bot]	0ffec67ca3	refactor: remove unused V2 code (#39699 ) Co-authored-by: Aiden Cline <rekram1-node@users.noreply.github.com>	2026-07-30 11:25:03 -05:00
Kit Langton	bd132f2614	refactor(core): skip redundant worktree lookup (#39692 )	2026-07-30 16:15:07 +00:00
opencode-agent[bot]	dcb0df4ac1	fix(core): stop MCP SSE error reconnect loops (#39671 ) Co-authored-by: Aiden Cline <rekram1-node@users.noreply.github.com>	2026-07-30 10:53:33 -05:00
Kit Langton	02f3504055	fix(tui): hide redundant session directory labels (#39686 )	2026-07-30 11:37:33 -04:00
James Long	f23ee5e4a8	refactor(core): simplify formatter selection (#39575 )	2026-07-30 10:59:01 -04:00
Kit Langton	77aa85c589	feat(tui): project picker with footer crossfade (#39566 )	2026-07-30 10:39:22 -04:00
Dax Raad	a618946b7e	fix(tui): reload plugins with config	2026-07-30 10:31:09 -04:00
opencode-agent[bot]	f9de608dea	chore: refresh bun lockfile (#39617 ) Co-authored-by: Aiden Cline <rekram1-node@users.noreply.github.com>	2026-07-30 04:36:21 +00:00
Aiden Cline	906dc8f5b2	fix(ai): apply catalog settings to provider models (#39613 )	2026-07-29 22:42:47 -05:00
Aiden Cline	12971935ab	feat(core): parse shell permission commands (#39567 )	2026-07-29 22:42:18 -05:00
Kit Langton	78c139b8b5	feat(plugin): add ui.tabs API for session tab control (#39591 )	2026-07-29 22:57:39 -04:00
Kit Langton	c161978852	feat(tui): prefetch open session tabs after connect (#39589 )	2026-07-29 22:23:13 -04:00
Kit Langton	cb37a7166a	feat(tui): make session tab switching fast for long transcripts (#39568 )	2026-07-29 22:23:10 -04:00
Dax Raad	488445a679	fix(tui): correct project-aware session lists	2026-07-29 21:59:33 -04:00
opencode-agent[bot]	97786afdd8	refactor(core): share file diff construction (#39586 ) Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>	2026-07-30 00:28:33 +00:00
Aiden Cline	b1a5e8a6ae	test(tui): restore compaction event lifecycle (#39581 )	2026-07-29 18:11:58 -05:00
Aiden Cline	0ece10af43	fix(core): add mutation permission previews (#39578 )	2026-07-29 18:04:13 -05:00
Aiden Cline	d1a02b149c	fix(core): clarify subagent tool guidance (#39572 )	2026-07-29 16:48:49 -05:00
James Long	94ee274aeb	feat(core): add V2 formatter runtime (#39564 )	2026-07-29 17:23:04 -04:00
Kit Langton	3c259fc552	feat(tui): replace scrap screen with component storybook (#39548 )	2026-07-29 15:51:15 -04:00
Aiden Cline	210be4b749	fix(core): preserve shell output on timeout (#39559 )	2026-07-29 14:31:26 -05:00
James Long	464649e67e	feat(tui): batch event delivery (#39551 )	2026-07-29 15:20:39 -04:00