test(core): fix layer node type assertion

packages/core/test/agent.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect } from "bun:test"
 import { Effect, Exit, Scope } from "effect"
 import { AgentV2 } from "@opencode-ai/core/agent"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { Location } from "@opencode-ai/core/location"
 import { AgentPlugin } from "@opencode-ai/core/plugin/agent"
 import { AbsolutePath } from "@opencode-ai/core/schema"
@@ -8,7 +9,7 @@ import { location } from "./fixture/location"
 import { testEffect } from "./lib/effect"
 import { agentHost, host } from "./plugin/host"
 
-const it = testEffect(AgentV2.locationLayer)
+const it = testEffect(AppNodeBuilder.build(AgentV2.node))
 
 describe("AgentV2", () => {
   it.effect("starts without agents", () =>

packages/core/test/background-job.test.ts

@@ -1,8 +1,11 @@
 import { describe, expect } from "bun:test"
 import { BackgroundJob } from "@opencode-ai/core/background-job"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { Deferred, Effect, Exit, Scope } from "effect"
 import { it } from "./lib/effect"
 
+const jobsLayer = LayerNode.compile(BackgroundJob.node)
+
 describe("BackgroundJob", () => {
   it.live("tracks process-local work through explicit observation", () =>
     Effect.gen(function* () {
@@ -25,7 +28,7 @@ describe("BackgroundJob", () => {
         timedOut: false,
         info: { status: "completed", output: "done" },
       })
-    }).pipe(Effect.provide(BackgroundJob.layer)),
+    }).pipe(Effect.provide(jobsLayer)),
   )
 
   it.live("publishes jobs before starting immediately settling work", () =>
@@ -55,7 +58,7 @@ describe("BackgroundJob", () => {
           })
         })
       })
-    }).pipe(Effect.provide(BackgroundJob.layer)),
+    }).pipe(Effect.provide(jobsLayer)),
   )
 
   it.live("increments pending work before starting immediately settling extensions", () =>
@@ -80,7 +83,7 @@ describe("BackgroundJob", () => {
           })
         }),
       )
-    }).pipe(Effect.provide(BackgroundJob.layer)),
+    }).pipe(Effect.provide(jobsLayer)),
   )
 
   it.live("interrupts live work without promising settlement after the owning process-local scope closes", () =>

packages/core/test/command.test.ts

@@ -1,11 +1,12 @@
 import { describe, expect } from "bun:test"
 import { Effect } from "effect"
 import { CommandV2 } from "@opencode-ai/core/command"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { ModelV2 } from "@opencode-ai/core/model"
 import { ProviderV2 } from "@opencode-ai/core/provider"
 import { testEffect } from "./lib/effect"
 
-const it = testEffect(CommandV2.locationLayer)
+const it = testEffect(AppNodeBuilder.build(CommandV2.node))
 
 describe("CommandV2", () => {
   it.effect("applies command transforms and preserves later overrides", () =>

packages/core/test/effect/layer-node/layer-node-types.test.ts

@@ -69,8 +69,8 @@ void invalidNodeReplacement
 // @ts-expect-error Replacement cannot introduce a new error
 LayerNode.compile(a, [[a, Layer.effect(A, Effect.fail(new OtherError()))]])
 
-// @ts-expect-error Node replacement cannot introduce a new error
 const invalidNodeErrorReplacement = () =>
+  // @ts-expect-error Node replacement cannot introduce a new error
   LayerNode.compile(a, [[a, make({ service: A, layer: Layer.effect(A, Effect.fail(new OtherError())), deps: [] })]])
 void invalidNodeErrorReplacement
 

packages/core/test/location.test.ts

@@ -1,5 +1,6 @@
 import { describe, expect } from "bun:test"
 import { Effect, Layer } from "effect"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { Location } from "@opencode-ai/core/location"
 import { Project } from "@opencode-ai/core/project"
 import { AbsolutePath } from "@opencode-ai/core/schema"
@@ -21,7 +22,7 @@ const projectLayer = Layer.succeed(
     commit: () => Effect.void,
   }),
 )
-const it = testEffect(Location.layer(ref).pipe(Layer.provide(projectLayer)))
+const it = testEffect(AppNodeBuilder.build(Location.boundNode(ref), [[Project.node, projectLayer]]))
 
 describe("Location", () => {
   it.effect("resolves the current project and vcs information", () =>

packages/core/test/npm.test.ts

@@ -1,12 +1,10 @@
 import fs from "fs/promises"
 import path from "path"
 import { describe, expect, test } from "bun:test"
-import { NodeFileSystem } from "@effect/platform-node"
-import { Effect, Layer, Option } from "effect"
-import { FSUtil } from "@opencode-ai/core/fs-util"
+import { Effect, Option } from "effect"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { Global } from "@opencode-ai/core/global"
 import { Npm } from "@opencode-ai/core/npm"
-import { EffectFlock } from "@opencode-ai/core/util/effect-flock"
 import { tmpdir } from "./fixture/tmpdir"
 
 const win = process.platform === "win32"
@@ -21,12 +19,7 @@ const writePackage = (dir: string, pkg: Record<string, unknown>) =>
   )
 
 const npmLayer = (cache: string) =>
-  Npm.layer.pipe(
-    Layer.provide(EffectFlock.layer),
-    Layer.provide(FSUtil.layer),
-    Layer.provide(Global.layerWith({ cache, state: path.join(cache, "state") })),
-    Layer.provide(NodeFileSystem.layer),
-  )
+  AppNodeBuilder.build(Npm.node, [[Global.node, Global.layerWith({ cache, state: path.join(cache, "state") })]])
 
 describe("Npm.sanitize", () => {
   test("keeps normal scoped package specs unchanged", () => {

packages/core/test/plugin/command.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect } from "bun:test"
 import { Effect, Layer } from "effect"
 import { CommandV2 } from "@opencode-ai/core/command"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { Location } from "@opencode-ai/core/location"
 import { CommandPlugin } from "@opencode-ai/core/plugin/command"
 import { AbsolutePath } from "@opencode-ai/core/schema"
@@ -10,12 +11,9 @@ import { host } from "./host"
 
 const directory = AbsolutePath.make("/repo/packages/app")
 const project = AbsolutePath.make("/repo")
+const locationLayer = Layer.succeed(Location.Service, Location.Service.of(location({ directory }, { projectDirectory: project })))
 const it = testEffect(
-  CommandV2.locationLayer.pipe(
-    Layer.provide(
-      Layer.succeed(Location.Service, Location.Service.of(location({ directory }, { projectDirectory: project }))),
-    ),
-  ),
+  AppNodeBuilder.build(CommandV2.node, [[Location.node, locationLayer]]),
 )
 
 describe("CommandPlugin.Plugin", () => {

packages/core/test/policy.test.ts

@@ -1,5 +1,6 @@
 import { describe, expect } from "bun:test"
 import { Effect, Layer } from "effect"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { Location } from "@opencode-ai/core/location"
 import { Policy } from "@opencode-ai/core/policy"
 import { AbsolutePath } from "@opencode-ai/core/schema"
@@ -7,11 +8,9 @@ import { location } from "./fixture/location"
 import { testEffect } from "./lib/effect"
 
 const it = testEffect(
-  Policy.locationLayer.pipe(
-    Layer.provide(
-      Layer.succeed(Location.Service, Location.Service.of(location({ directory: AbsolutePath.make("test") }))),
-    ),
-  ),
+  AppNodeBuilder.build(Policy.node, [
+    [Location.node, Layer.succeed(Location.Service, Location.Service.of(location({ directory: AbsolutePath.make("test") })))],
+  ]),
 )
 
 describe("Policy", () => {

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

@@ -1,6 +1,8 @@
 import { describe, expect } from "bun:test"
 import { Cause, Deferred, Effect, Exit, Layer, Queue } from "effect"
 import { Config } from "@opencode-ai/core/config"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { EventV2 } from "@opencode-ai/core/event"
 import { Location } from "@opencode-ai/core/location"
 import { Pty } from "@opencode-ai/core/pty"
@@ -17,11 +19,10 @@ const locationLayer = Layer.succeed(
 )
 const configLayer = Layer.mock(Config.Service)({ entries: () => Effect.succeed([]) })
 const it = testEffect(
-  Pty.layer.pipe(
-    Layer.provide(configLayer),
-    Layer.provideMerge(EventV2.defaultLayer),
-    Layer.provideMerge(locationLayer),
-  ),
+  AppNodeBuilder.build(LayerNode.group([Pty.node, EventV2.node]), [
+    [Config.node, configLayer],
+    [Location.node, locationLayer],
+  ]),
 )
 const ptyTest = process.platform === "win32" ? it.live.skip : it.live
 
@@ -205,8 +206,9 @@ describe("pty", () => {
 
 const configuredShell = process.platform === "win32" ? undefined : Bun.which("bash")
 const configuredIt = testEffect(
-  Pty.layer.pipe(
-    Layer.provide(
+  AppNodeBuilder.build(LayerNode.group([Pty.node, EventV2.node]), [
+    [
+      Config.node,
       Layer.mock(Config.Service)({
         entries: () =>
           Effect.succeed(
@@ -215,10 +217,9 @@ const configuredIt = testEffect(
               : [],
           ),
       }),
-    ),
-    Layer.provideMerge(EventV2.defaultLayer),
-    Layer.provideMerge(locationLayer),
-  ),
+    ],
+    [Location.node, locationLayer],
+  ]),
 )
 const configuredTest = process.platform === "win32" ? configuredIt.live.skip : configuredIt.live
 

packages/core/test/pty/ticket.test.ts

@@ -1,12 +1,15 @@
 import { describe, expect } from "bun:test"
 import { Effect, Layer } from "effect"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { PtyID } from "@opencode-ai/core/pty/schema"
 import { PtyTicket } from "@opencode-ai/core/pty/ticket"
 import { WorkspaceV2 } from "@opencode-ai/core/workspace"
 import { testEffect } from "../lib/effect"
 
-const it = testEffect(PtyTicket.layer)
-const itExpiring = testEffect(Layer.effect(PtyTicket.Service, PtyTicket.make(5)))
+const it = testEffect(LayerNode.compile(PtyTicket.node))
+const itExpiring = testEffect(
+  LayerNode.compile(PtyTicket.node, [[PtyTicket.node, Layer.effect(PtyTicket.Service, PtyTicket.make(5))]]),
+)
 
 describe("PTY websocket tickets", () => {
   it.live("consumes tickets once", () =>

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

@@ -1,11 +1,15 @@
 import { describe, expect } from "bun:test"
 import { Effect, Layer } from "effect"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { AbsolutePath } from "@opencode-ai/core/schema"
 import { Reference } from "@opencode-ai/core/reference"
 import { ReferenceGuidance } from "@opencode-ai/core/reference/guidance"
 import { SystemContext } from "@opencode-ai/core/system-context/index"
 import { it } from "./lib/effect"
 
+const guidanceLayer = (referenceLayer: Layer.Layer<Reference.Service>) =>
+  AppNodeBuilder.build(ReferenceGuidance.node, [[Reference.node, referenceLayer]])
+
 describe("ReferenceGuidance", () => {
   it.effect("lists available references in the system context", () =>
     Effect.gen(function* () {
@@ -17,23 +21,24 @@ describe("ReferenceGuidance", () => {
       expect(generation.baseline).toContain("<path>/docs</path>")
       expect(generation.baseline).toContain("<description>Use for product documentation</description>")
     }).pipe(
-      Effect.provide(ReferenceGuidance.layer),
       Effect.provide(
-        Layer.mock(Reference.Service, {
-          list: () =>
-            Effect.succeed([
-              new Reference.Info({
-                name: "docs",
-                path: AbsolutePath.make("/docs"),
-                description: "Use for product documentation",
-                source: Reference.LocalSource.make({
-                  type: "local",
+        guidanceLayer(
+          Layer.mock(Reference.Service, {
+            list: () =>
+              Effect.succeed([
+                new Reference.Info({
+                  name: "docs",
                   path: AbsolutePath.make("/docs"),
                   description: "Use for product documentation",
+                  source: Reference.LocalSource.make({
+                    type: "local",
+                    path: AbsolutePath.make("/docs"),
+                    description: "Use for product documentation",
+                  }),
                 }),
-              }),
-            ]),
-        }),
+              ]),
+          }),
+        ),
       ),
     ),
   )
@@ -43,10 +48,7 @@ describe("ReferenceGuidance", () => {
       const guidance = yield* ReferenceGuidance.Service
       const generation = yield* SystemContext.initialize(yield* guidance.load())
       expect(generation.baseline).toBe("")
-    }).pipe(
-      Effect.provide(ReferenceGuidance.layer),
-      Effect.provide(Layer.mock(Reference.Service, { list: () => Effect.succeed([]) })),
-    ),
+    }).pipe(Effect.provide(guidanceLayer(Layer.mock(Reference.Service, { list: () => Effect.succeed([]) })))),
   )
 
   it.effect("omits references without descriptions", () =>
@@ -55,18 +57,19 @@ describe("ReferenceGuidance", () => {
       const generation = yield* SystemContext.initialize(yield* guidance.load())
       expect(generation.baseline).toBe("")
     }).pipe(
-      Effect.provide(ReferenceGuidance.layer),
       Effect.provide(
-        Layer.mock(Reference.Service, {
-          list: () =>
-            Effect.succeed([
-              new Reference.Info({
-                name: "docs",
-                path: AbsolutePath.make("/docs"),
-                source: Reference.LocalSource.make({ type: "local", path: AbsolutePath.make("/docs") }),
-              }),
-            ]),
-        }),
+        guidanceLayer(
+          Layer.mock(Reference.Service, {
+            list: () =>
+              Effect.succeed([
+                new Reference.Info({
+                  name: "docs",
+                  path: AbsolutePath.make("/docs"),
+                  source: Reference.LocalSource.make({ type: "local", path: AbsolutePath.make("/docs") }),
+                }),
+              ]),
+          }),
+        ),
       ),
     ),
   )

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

@@ -4,6 +4,8 @@ import { Effect, Layer, Stream } from "effect"
 import { AgentV2 } from "@opencode-ai/core/agent"
 import { asc, eq } from "drizzle-orm"
 import { Database } from "@opencode-ai/core/database/database"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { EventV2 } from "@opencode-ai/core/event"
 import { EventTable } from "@opencode-ai/core/event/sql"
 import { Location } from "@opencode-ai/core/location"
@@ -13,7 +15,6 @@ import { ProjectTable } from "@opencode-ai/core/project/sql"
 import { ProviderV2 } from "@opencode-ai/core/provider"
 import { AbsolutePath } from "@opencode-ai/core/schema"
 import { SessionV2 } from "@opencode-ai/core/session"
-import { locationServiceMapLayer } from "@opencode-ai/core/location-services"
 import { SessionV1 } from "@opencode-ai/core/v1/session"
 import { Prompt } from "@opencode-ai/core/session/prompt"
 import { SessionProjector } from "@opencode-ai/core/session/projector"
@@ -34,24 +35,11 @@ const projects = Layer.succeed(
     commit: () => Effect.void,
   }),
 )
-const sessions = SessionV2.layer.pipe(
-  Layer.provide(locationServiceMapLayer),
-  Layer.provide(EventV2.defaultLayer),
-  Layer.provide(Database.defaultLayer),
-  Layer.provide(SessionStore.defaultLayer),
-  Layer.provide(projects),
-  Layer.provide(SessionExecution.noopLayer),
-)
 const it = testEffect(
-  Layer.mergeAll(
-    Database.defaultLayer,
-    EventV2.defaultLayer,
-    projects,
-    SessionProjector.defaultLayer,
-    SessionStore.defaultLayer,
-    SessionExecution.noopLayer,
-    sessions,
-  ),
+  AppNodeBuilder.build(LayerNode.group([Database.node, EventV2.node, SessionProjector.node, SessionStore.node, SessionV2.node]), [
+    [ProjectV2.node, projects],
+    [SessionExecution.node, SessionExecution.noopLayer],
+  ]),
 )
 const location = Location.Ref.make({ directory: AbsolutePath.make("/project") })
 const id = SessionV2.ID.create()
@@ -248,9 +236,10 @@ describe("SessionV2.create", () => {
         (tmp) => Effect.promise(() => tmp[Symbol.asyncDispose]()),
       )
       const targetDatabase = Database.layerFromPath(path.join(tmp.path, "target.sqlite"))
-      const targetEvents = EventV2.layer.pipe(Layer.provide(targetDatabase))
-      const targetProjector = SessionProjector.layer.pipe(Layer.provide(targetEvents), Layer.provide(targetDatabase))
-      const targetStore = SessionStore.layer.pipe(Layer.provide(targetDatabase))
+      const targetLayer = AppNodeBuilder.build(
+        LayerNode.group([Database.node, EventV2.node, SessionProjector.node, SessionStore.node]),
+        [[Database.node, targetDatabase]],
+      )
 
       yield* Effect.gen(function* () {
         const db = (yield* Database.Service).db
@@ -298,7 +287,7 @@ describe("SessionV2.create", () => {
           [1, EventV2.versionedType(SessionEvent.PromptAdmitted.type, 1)],
           [2, EventV2.versionedType(SessionEvent.Prompted.type, 1)],
         ])
-      }).pipe(Effect.provide(Layer.fresh(Layer.mergeAll(targetDatabase, targetEvents, targetProjector, targetStore))))
+      }).pipe(Effect.provide(Layer.fresh(targetLayer)))
     }),
   )
 

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

@@ -1,9 +1,10 @@
 import { describe, expect } from "bun:test"
 import { Effect, Layer, Schema } from "effect"
 import { Database } from "@opencode-ai/core/database/database"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { EventV2 } from "@opencode-ai/core/event"
 import { Location } from "@opencode-ai/core/location"
-import { locationServiceMapLayer } from "@opencode-ai/core/location-services"
 import { ProjectV2 } from "@opencode-ai/core/project"
 import { ProjectTable } from "@opencode-ai/core/project/sql"
 import { AbsolutePath } from "@opencode-ai/core/schema"
@@ -22,24 +23,11 @@ const projects = Layer.succeed(
     commit: () => Effect.void,
   }),
 )
-const sessions = SessionV2.layer.pipe(
-  Layer.provide(locationServiceMapLayer),
-  Layer.provide(EventV2.defaultLayer),
-  Layer.provide(Database.defaultLayer),
-  Layer.provide(SessionStore.defaultLayer),
-  Layer.provide(projects),
-  Layer.provide(SessionExecution.noopLayer),
-)
 const it = testEffect(
-  Layer.mergeAll(
-    Database.defaultLayer,
-    EventV2.defaultLayer,
-    projects,
-    SessionProjector.defaultLayer,
-    SessionStore.defaultLayer,
-    SessionExecution.noopLayer,
-    sessions,
-  ),
+  AppNodeBuilder.build(LayerNode.group([Database.node, EventV2.node, SessionProjector.node, SessionStore.node, SessionV2.node]), [
+    [ProjectV2.node, projects],
+    [SessionExecution.node, SessionExecution.noopLayer],
+  ]),
 )
 const location = Location.Ref.make({ directory: AbsolutePath.make("/project") })
 

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

@@ -2,6 +2,8 @@ import { describe, expect } from "bun:test"
 import { DateTime, Effect, Fiber, Layer, Stream } from "effect"
 import { eq } from "drizzle-orm"
 import { Database } from "@opencode-ai/core/database/database"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { EventV2 } from "@opencode-ai/core/event"
 import { EventTable } from "@opencode-ai/core/event/sql"
 import { SessionEvent } from "@opencode-ai/core/session/event"
@@ -9,7 +11,6 @@ import { Project } from "@opencode-ai/core/project"
 import { ProjectTable } from "@opencode-ai/core/project/sql"
 import { AbsolutePath } from "@opencode-ai/core/schema"
 import { SessionV2 } from "@opencode-ai/core/session"
-import { locationServiceMapLayer } from "@opencode-ai/core/location-services"
 import { Prompt } from "@opencode-ai/core/session/prompt"
 import { SessionMessage } from "@opencode-ai/core/session/message"
 import { SessionProjector } from "@opencode-ai/core/session/projector"
@@ -41,23 +42,10 @@ const execution = Layer.succeed(
       }),
   }),
 )
-const sessions = SessionV2.layer.pipe(
-  Layer.provide(locationServiceMapLayer),
-  Layer.provide(EventV2.defaultLayer),
-  Layer.provide(Database.defaultLayer),
-  Layer.provide(SessionStore.defaultLayer),
-  Layer.provide(Project.defaultLayer),
-  Layer.provide(execution),
-)
 const it = testEffect(
-  Layer.mergeAll(
-    Database.defaultLayer,
-    EventV2.defaultLayer,
-    SessionProjector.defaultLayer,
-    SessionStore.defaultLayer,
-    execution,
-    sessions,
-  ),
+  AppNodeBuilder.build(LayerNode.group([Database.node, EventV2.node, SessionProjector.node, SessionStore.node, SessionV2.node]), [
+    [SessionExecution.node, execution],
+  ]),
 )
 const sessionID = SessionV2.ID.make("ses_prompt_test")
 const messageID = SessionMessage.ID.create()

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

@@ -1,6 +1,8 @@
 import { describe, expect } from "bun:test"
 import { Tool } from "@opencode-ai/core/tool/tool"
 import { AgentV2 } from "@opencode-ai/core/agent"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { ApplicationTools } from "@opencode-ai/core/tool/application-tools"
 import { SessionV2 } from "@opencode-ai/core/session"
 import { SessionMessage } from "@opencode-ai/core/session/message"
@@ -27,9 +29,11 @@ const outputStore = Layer.mock(ToolOutputStore.Service, {
     )
   },
 })
-const registry = ToolRegistry.layer.pipe(Layer.provide(ApplicationTools.layer), Layer.provide(outputStore))
-const it = testEffect(registry)
-const integrated = testEffect(Layer.mergeAll(ApplicationTools.layer, registry))
+const registryLayer = AppNodeBuilder.build(ToolRegistry.node, [[ToolOutputStore.node, outputStore]])
+const it = testEffect(registryLayer)
+const integrated = testEffect(
+  AppNodeBuilder.build(LayerNode.group([ApplicationTools.node, ToolRegistry.node]), [[ToolOutputStore.node, outputStore]]),
+)
 const identity = {
   agent: AgentV2.ID.make("build"),
   assistantMessageID: SessionMessage.ID.make("msg_registry"),

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

@@ -2,6 +2,7 @@ import path from "path"
 import { describe, expect } from "bun:test"
 import { Effect, Layer } from "effect"
 import { AgentV2 } from "@opencode-ai/core/agent"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { AbsolutePath } from "@opencode-ai/core/schema"
 import { SkillV2 } from "@opencode-ai/core/skill"
 import { SystemContext } from "@opencode-ai/core/system-context"
@@ -28,7 +29,9 @@ const denied = SkillV2.Info.make({
 })
 
 const layer = (list: () => SkillV2.Info[]) =>
-  SkillGuidance.layer.pipe(Layer.provide(Layer.mock(SkillV2.Service, { list: () => Effect.succeed(list()) })))
+  AppNodeBuilder.build(SkillGuidance.node, [
+    [SkillV2.node, Layer.mock(SkillV2.Service, { list: () => Effect.succeed(list()) })],
+  ])
 
 describe("SkillGuidance", () => {
   it.effect("renders described agent skills and reconciles the complete available list", () => {

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

@@ -1,5 +1,6 @@
 import { describe, expect } from "bun:test"
 import { Cause, Effect, Exit, Schema, Scope } from "effect"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { SystemContext } from "@opencode-ai/core/system-context"
 import { SystemContextRegistry } from "@opencode-ai/core/system-context/registry"
 import { testEffect } from "../lib/effect"
@@ -17,7 +18,7 @@ const entry = (key: string, text: string, sourceKey = key) => ({
   ),
 })
 
-const it = testEffect(SystemContextRegistry.layer)
+const it = testEffect(AppNodeBuilder.build(SystemContextRegistry.node))
 
 describe("SystemContextRegistry", () => {
   it.effect("loads empty system context when there are no entries", () =>

packages/core/test/tool-question.test.ts

@@ -1,5 +1,6 @@
 import { describe, expect } from "bun:test"
 import { Effect, Exit, Fiber, Layer } from "effect"
+import { makeLocationNode } from "@opencode-ai/core/effect/app-node"
 import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { PermissionV2 } from "@opencode-ai/core/permission"
@@ -31,9 +32,6 @@ const permission = Layer.succeed(
     list: () => Effect.die("unused"),
   }),
 )
-const registry = AppNodeBuilder.build(LayerNode.group([ToolRegistry.node, ToolRegistry.toolsNode]), [
-  [ToolOutputStore.node, ToolOutputStore.nodeWithoutConfig],
-])
 const question = Layer.succeed(
   QuestionV2.Service,
   QuestionV2.Service.of({
@@ -46,8 +44,18 @@ const question = Layer.succeed(
     list: () => Effect.die("unused"),
   }),
 )
-const tool = QuestionTool.layer.pipe(Layer.provide(registry), Layer.provide(permission), Layer.provide(question))
-const it = testEffect(Layer.mergeAll(permission, registry, question, tool))
+const toolNode = makeLocationNode({
+  name: "test/question-tool",
+  layer: QuestionTool.layer,
+  deps: [ToolRegistry.node, PermissionV2.node, QuestionV2.node],
+})
+const it = testEffect(
+  AppNodeBuilder.build(LayerNode.group([ToolRegistry.node, ToolRegistry.toolsNode, toolNode]), [
+    [PermissionV2.node, permission],
+    [QuestionV2.node, question],
+    [ToolOutputStore.node, ToolOutputStore.nodeWithoutConfig],
+  ]),
+)
 
 describe("QuestionTool", () => {
   it.effect("omits a denied built-in question and terminally settles a stale call", () =>

packages/core/test/tool-todowrite.test.ts

@@ -1,6 +1,9 @@
 import { describe, expect } from "bun:test"
 import { Effect, Layer } from "effect"
 import { Database } from "@opencode-ai/core/database/database"
+import { makeLocationNode } from "@opencode-ai/core/effect/app-node"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { EventV2 } from "@opencode-ai/core/event"
 import { PermissionV2 } from "@opencode-ai/core/permission"
 import { Project } from "@opencode-ai/core/project"
@@ -11,6 +14,7 @@ import { SessionTable } from "@opencode-ai/core/session/sql"
 import { SessionTodo } from "@opencode-ai/core/session/todo"
 import { TodoWriteTool } from "@opencode-ai/core/tool/todowrite"
 import { ToolRegistry } from "@opencode-ai/core/tool/registry"
+import { ToolOutputStore } from "@opencode-ai/core/tool-output-store"
 import { testEffect } from "./lib/effect"
 import { toolIdentity, executeTool, settleTool, toolDefinitions } from "./lib/tool"
 
@@ -32,14 +36,19 @@ const permission = Layer.succeed(
     list: () => Effect.die("unused"),
   }),
 )
-const registry = ToolRegistry.defaultLayer.pipe(Layer.provide(permission))
-const tool = TodoWriteTool.layer.pipe(
-  Layer.provide(registry),
-  Layer.provide(permission),
-  Layer.provide(SessionTodo.defaultLayer),
-)
+const toolNode = makeLocationNode({
+  name: "test/todowrite-tool",
+  layer: TodoWriteTool.layer,
+  deps: [ToolRegistry.node, PermissionV2.node, SessionTodo.node],
+})
 const it = testEffect(
-  Layer.mergeAll(Database.defaultLayer, EventV2.defaultLayer, SessionTodo.defaultLayer, permission, registry, tool),
+  AppNodeBuilder.build(
+    LayerNode.group([Database.node, EventV2.node, SessionTodo.node, ToolRegistry.node, ToolRegistry.toolsNode, toolNode]),
+    [
+      [PermissionV2.node, permission],
+      [ToolOutputStore.node, ToolOutputStore.nodeWithoutConfig],
+    ],
+  ),
 )
 
 const setup = Effect.gen(function* () {

packages/core/test/tool-webfetch.test.ts

@@ -1,11 +1,16 @@
 import { describe, expect, test } from "bun:test"
 import { Duration, Effect, Fiber, Layer, Schema } from "effect"
 import * as TestClock from "effect/testing/TestClock"
-import { FetchHttpClient, HttpClient, HttpClientRequest, HttpClientResponse } from "effect/unstable/http"
+import { HttpClient, HttpClientRequest, HttpClientResponse } from "effect/unstable/http"
+import { makeLocationNode } from "@opencode-ai/core/effect/app-node"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
+import { LayerNodePlatform } from "@opencode-ai/core/effect/app-node-platform"
 import { PermissionV2 } from "@opencode-ai/core/permission"
 import { SessionV2 } from "@opencode-ai/core/session"
 import { ToolRegistry } from "@opencode-ai/core/tool/registry"
 import { WebFetchTool } from "@opencode-ai/core/tool/webfetch"
+import { ToolOutputStore } from "@opencode-ai/core/tool-output-store"
 import { testEffect } from "./lib/effect"
 import { toolIdentity, executeTool, settleTool, toolDefinitions } from "./lib/tool"
 
@@ -35,15 +40,19 @@ const permission = Layer.succeed(
     list: () => Effect.die("unused"),
   }),
 )
-const registry = ToolRegistry.defaultLayer.pipe(Layer.provide(permission))
-const webfetch = WebFetchTool.layer.pipe(Layer.provide(registry), Layer.provide(permission), Layer.provide(http))
-const it = testEffect(Layer.mergeAll(registry, permission, http, webfetch))
-const fetchWebfetch = WebFetchTool.layer.pipe(
-  Layer.provide(registry),
-  Layer.provide(permission),
-  Layer.provide(FetchHttpClient.layer),
-)
-const live = testEffect(Layer.mergeAll(registry, permission, FetchHttpClient.layer, fetchWebfetch))
+const toolNode = makeLocationNode({
+  name: "test/webfetch-tool",
+  layer: WebFetchTool.layer,
+  deps: [ToolRegistry.node, PermissionV2.node, LayerNodePlatform.httpClient],
+})
+const toolLayer = (replacements: LayerNode.Replacements = []) =>
+  AppNodeBuilder.build(LayerNode.group([ToolRegistry.node, ToolRegistry.toolsNode, toolNode]), [
+    [PermissionV2.node, permission],
+    [ToolOutputStore.node, ToolOutputStore.nodeWithoutConfig],
+    ...replacements,
+  ])
+const it = testEffect(toolLayer([[LayerNodePlatform.httpClient, http]]))
+const live = testEffect(toolLayer())
 
 const reset = () => {
   requests.length = 0

packages/core/test/tool-websearch.test.ts

@@ -1,10 +1,15 @@
 import { beforeEach, describe, expect, test } from "bun:test"
 import { Effect, Layer, Schema } from "effect"
 import { HttpClient, HttpClientResponse } from "effect/unstable/http"
+import { makeLocationNode } from "@opencode-ai/core/effect/app-node"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
+import { LayerNodePlatform } from "@opencode-ai/core/effect/app-node-platform"
 import { PermissionV2 } from "@opencode-ai/core/permission"
 import { SessionV2 } from "@opencode-ai/core/session"
 import { ToolRegistry } from "@opencode-ai/core/tool/registry"
 import { WebSearchTool } from "@opencode-ai/core/tool/websearch"
+import { ToolOutputStore } from "@opencode-ai/core/tool-output-store"
 import { testEffect } from "./lib/effect"
 import { toolIdentity, executeTool, settleTool, toolDefinitions } from "./lib/tool"
 
@@ -99,7 +104,6 @@ const permission = Layer.succeed(
     list: () => Effect.die("unused"),
   }),
 )
-const registry = ToolRegistry.defaultLayer.pipe(Layer.provide(permission))
 const websearchConfig = Layer.succeed(
   WebSearchTool.ConfigService,
   WebSearchTool.ConfigService.of({
@@ -120,13 +124,23 @@ const websearchConfig = Layer.succeed(
     },
   }),
 )
-const websearch = WebSearchTool.layer.pipe(
-  Layer.provide(registry),
-  Layer.provide(permission),
-  Layer.provide(http),
-  Layer.provide(websearchConfig),
+const websearchConfigNode = makeLocationNode({
+  service: WebSearchTool.ConfigService,
+  layer: websearchConfig,
+  deps: [],
+})
+const toolNode = makeLocationNode({
+  name: "test/websearch-tool",
+  layer: WebSearchTool.layer,
+  deps: [ToolRegistry.node, PermissionV2.node, LayerNodePlatform.httpClient, websearchConfigNode],
+})
+const it = testEffect(
+  AppNodeBuilder.build(LayerNode.group([ToolRegistry.node, ToolRegistry.toolsNode, websearchConfigNode, toolNode]), [
+    [PermissionV2.node, permission],
+    [LayerNodePlatform.httpClient, http],
+    [ToolOutputStore.node, ToolOutputStore.nodeWithoutConfig],
+  ]),
 )
-const it = testEffect(Layer.mergeAll(registry, permission, http, websearchConfig, websearch))
 
 describe("WebSearchTool registration", () => {
   it.effect("registers websearch, asserts query permission, and calls Exa", () =>