diff --git a/packages/opencode/src/tool/tool.ts b/packages/opencode/src/tool/tool.ts
index 3009f4cd27..49dd2b0605 100644
--- a/packages/opencode/src/tool/tool.ts
+++ b/packages/opencode/src/tool/tool.ts
@@ -70,7 +70,12 @@ export namespace Tool {
         ? Def<P, M>
         : never
 
-  function wrap<Parameters extends z.ZodType, Result extends Metadata>(id: string, init: Init<Parameters, Result>) {
+  function wrap<Parameters extends z.ZodType, Result extends Metadata>(
+    id: string,
+    init: Init<Parameters, Result>,
+    truncate: Truncate.Interface,
+    agents: Agent.Interface,
+  ) {
     return () =>
       Effect.gen(function* () {
         const toolInfo = init instanceof Function ? { ...(yield* init()) } : { ...init }
@@ -93,8 +98,8 @@ export namespace Tool {
             if (result.metadata.truncated !== undefined) {
               return result
             }
-            const agent = yield* Effect.promise(() => Agent.get(ctx.agent))
-            const truncated = yield* Effect.promise(() => Truncate.output(result.output, {}, agent))
+            const agent = yield* agents.get(ctx.agent)
+            const truncated = yield* truncate.output(result.output, {}, agent)
             return {
               ...result,
               output: truncated.content,
@@ -112,9 +117,14 @@ export namespace Tool {
   export function define<Parameters extends z.ZodType, Result extends Metadata, R, ID extends string = string>(
     id: ID,
     init: Effect.Effect<Init<Parameters, Result>, never, R>,
-  ): Effect.Effect<Info<Parameters, Result>, never, R> & { id: ID } {
+  ): Effect.Effect<Info<Parameters, Result>, never, R | Truncate.Service | Agent.Service> & { id: ID } {
     return Object.assign(
-      Effect.map(init, (init) => ({ id, init: wrap(id, init) })),
+      Effect.gen(function* () {
+        const resolved = yield* init
+        const truncate = yield* Truncate.Service
+        const agents = yield* Agent.Service
+        return { id, init: wrap(id, resolved, truncate, agents) }
+      }),
       { id },
     )
   }
diff --git a/packages/opencode/src/tool/truncate.ts b/packages/opencode/src/tool/truncate.ts
index 716929cc64..fa9e0bcabe 100644
--- a/packages/opencode/src/tool/truncate.ts
+++ b/packages/opencode/src/tool/truncate.ts
@@ -2,7 +2,6 @@ import { NodePath } from "@effect/platform-node"
 import { Cause, Duration, Effect, Layer, Schedule, Context } from "effect"
 import path from "path"
 import type { Agent } from "../agent/agent"
-import { makeRuntime } from "@/effect/run-service"
 import { AppFileSystem } from "@/filesystem"
 import { evaluate } from "@/permission/evaluate"
 import { Identifier } from "../id/id"
@@ -135,10 +134,4 @@ export namespace Truncate {
   )
 
   export const defaultLayer = layer.pipe(Layer.provide(AppFileSystem.defaultLayer), Layer.provide(NodePath.layer))
-
-  const { runPromise } = makeRuntime(Service, defaultLayer)
-
-  export async function output(text: string, options: Options = {}, agent?: Agent.Info): Promise<Result> {
-    return runPromise((s) => s.output(text, options, agent))
-  }
 }
diff --git a/packages/opencode/test/tool/apply_patch.test.ts b/packages/opencode/test/tool/apply_patch.test.ts
index 4efa12f2fc..d65b1126c4 100644
--- a/packages/opencode/test/tool/apply_patch.test.ts
+++ b/packages/opencode/test/tool/apply_patch.test.ts
@@ -7,12 +7,14 @@ import { Instance } from "../../src/project/instance"
 import { LSP } from "../../src/lsp"
 import { AppFileSystem } from "../../src/filesystem"
 import { Format } from "../../src/format"
+import { Agent } from "../../src/agent/agent"
 import { Bus } from "../../src/bus"
+import { Truncate } from "../../src/tool/truncate"
 import { tmpdir } from "../fixture/fixture"
 import { SessionID, MessageID } from "../../src/session/schema"
 
 const runtime = ManagedRuntime.make(
-  Layer.mergeAll(LSP.defaultLayer, AppFileSystem.defaultLayer, Format.defaultLayer, Bus.layer),
+  Layer.mergeAll(LSP.defaultLayer, AppFileSystem.defaultLayer, Format.defaultLayer, Bus.layer, Truncate.defaultLayer, Agent.defaultLayer),
 )
 
 const baseCtx = {
diff --git a/packages/opencode/test/tool/bash.test.ts b/packages/opencode/test/tool/bash.test.ts
index e9a6ae38cf..839c066c6c 100644
--- a/packages/opencode/test/tool/bash.test.ts
+++ b/packages/opencode/test/tool/bash.test.ts
@@ -8,6 +8,7 @@ import { Instance } from "../../src/project/instance"
 import { Filesystem } from "../../src/util/filesystem"
 import { tmpdir } from "../fixture/fixture"
 import type { Permission } from "../../src/permission"
+import { Agent } from "../../src/agent/agent"
 import { Truncate } from "../../src/tool/truncate"
 import { SessionID, MessageID } from "../../src/session/schema"
 import * as CrossSpawnSpawner from "../../src/effect/cross-spawn-spawner"
@@ -15,7 +16,13 @@ import { AppFileSystem } from "../../src/filesystem"
 import { Plugin } from "../../src/plugin"
 
 const runtime = ManagedRuntime.make(
-  Layer.mergeAll(CrossSpawnSpawner.defaultLayer, AppFileSystem.defaultLayer, Plugin.defaultLayer),
+  Layer.mergeAll(
+    CrossSpawnSpawner.defaultLayer,
+    AppFileSystem.defaultLayer,
+    Plugin.defaultLayer,
+    Truncate.defaultLayer,
+    Agent.defaultLayer,
+  ),
 )
 
 function initBash() {
diff --git a/packages/opencode/test/tool/edit.test.ts b/packages/opencode/test/tool/edit.test.ts
index 0695b54bac..c19c22d2c5 100644
--- a/packages/opencode/test/tool/edit.test.ts
+++ b/packages/opencode/test/tool/edit.test.ts
@@ -9,8 +9,10 @@ import { FileTime } from "../../src/file/time"
 import { LSP } from "../../src/lsp"
 import { AppFileSystem } from "../../src/filesystem"
 import { Format } from "../../src/format"
+import { Agent } from "../../src/agent/agent"
 import { Bus } from "../../src/bus"
 import { BusEvent } from "../../src/bus/bus-event"
+import { Truncate } from "../../src/tool/truncate"
 import { SessionID, MessageID } from "../../src/session/schema"
 
 const ctx = {
@@ -34,7 +36,7 @@ async function touch(file: string, time: number) {
 }
 
 const runtime = ManagedRuntime.make(
-  Layer.mergeAll(LSP.defaultLayer, FileTime.defaultLayer, AppFileSystem.defaultLayer, Format.defaultLayer, Bus.layer),
+  Layer.mergeAll(LSP.defaultLayer, FileTime.defaultLayer, AppFileSystem.defaultLayer, Format.defaultLayer, Bus.layer, Truncate.defaultLayer, Agent.defaultLayer),
 )
 
 afterAll(async () => {
diff --git a/packages/opencode/test/tool/grep.test.ts b/packages/opencode/test/tool/grep.test.ts
index 4078c9ce6a..926b26003c 100644
--- a/packages/opencode/test/tool/grep.test.ts
+++ b/packages/opencode/test/tool/grep.test.ts
@@ -6,8 +6,10 @@ import { Instance } from "../../src/project/instance"
 import { tmpdir } from "../fixture/fixture"
 import { SessionID, MessageID } from "../../src/session/schema"
 import * as CrossSpawnSpawner from "../../src/effect/cross-spawn-spawner"
+import { Truncate } from "../../src/tool/truncate"
+import { Agent } from "../../src/agent/agent"
 
-const runtime = ManagedRuntime.make(Layer.mergeAll(CrossSpawnSpawner.defaultLayer))
+const runtime = ManagedRuntime.make(Layer.mergeAll(CrossSpawnSpawner.defaultLayer, Truncate.defaultLayer, Agent.defaultLayer))
 
 function initGrep() {
   return runtime.runPromise(GrepTool.pipe(Effect.flatMap((info) => info.init())))
diff --git a/packages/opencode/test/tool/question.test.ts b/packages/opencode/test/tool/question.test.ts
index f651f019ef..4b94552368 100644
--- a/packages/opencode/test/tool/question.test.ts
+++ b/packages/opencode/test/tool/question.test.ts
@@ -4,7 +4,9 @@ import { Tool } from "../../src/tool/tool"
 import { QuestionTool } from "../../src/tool/question"
 import { Question } from "../../src/question"
 import { SessionID, MessageID } from "../../src/session/schema"
+import { Agent } from "../../src/agent/agent"
 import * as CrossSpawnSpawner from "../../src/effect/cross-spawn-spawner"
+import { Truncate } from "../../src/tool/truncate"
 import { provideTmpdirInstance } from "../fixture/fixture"
 import { testEffect } from "../lib/effect"
 
@@ -19,7 +21,7 @@ const ctx = {
   ask: () => Effect.void,
 }
 
-const it = testEffect(Layer.mergeAll(Question.defaultLayer, CrossSpawnSpawner.defaultLayer))
+const it = testEffect(Layer.mergeAll(Question.defaultLayer, CrossSpawnSpawner.defaultLayer, Truncate.defaultLayer, Agent.defaultLayer))
 
 const pending = Effect.fn("QuestionToolTest.pending")(function* (question: Question.Interface) {
   for (;;) {
diff --git a/packages/opencode/test/tool/read.test.ts b/packages/opencode/test/tool/read.test.ts
index c41cefda37..2064193d5b 100644
--- a/packages/opencode/test/tool/read.test.ts
+++ b/packages/opencode/test/tool/read.test.ts
@@ -11,6 +11,7 @@ import { Instance } from "../../src/project/instance"
 import { SessionID, MessageID } from "../../src/session/schema"
 import { Instruction } from "../../src/session/instruction"
 import { ReadTool } from "../../src/tool/read"
+import { Truncate } from "../../src/tool/truncate"
 import { Tool } from "../../src/tool/tool"
 import { Filesystem } from "../../src/util/filesystem"
 import { provideInstance, tmpdirScoped } from "../fixture/fixture"
@@ -41,6 +42,7 @@ const it = testEffect(
     FileTime.defaultLayer,
     Instruction.defaultLayer,
     LSP.defaultLayer,
+    Truncate.defaultLayer,
   ),
 )
 
diff --git a/packages/opencode/test/tool/skill.test.ts b/packages/opencode/test/tool/skill.test.ts
index 47a8321efc..85af7f3789 100644
--- a/packages/opencode/test/tool/skill.test.ts
+++ b/packages/opencode/test/tool/skill.test.ts
@@ -1,6 +1,8 @@
 import { Effect, Layer, ManagedRuntime } from "effect"
+import { Agent } from "../../src/agent/agent"
 import { Skill } from "../../src/skill"
 import { Ripgrep } from "../../src/file/ripgrep"
+import { Truncate } from "../../src/tool/truncate"
 import { afterEach, describe, expect, test } from "bun:test"
 import path from "path"
 import { pathToFileURL } from "url"
@@ -150,7 +152,7 @@ Use this skill.
       await Instance.provide({
         directory: tmp.path,
         fn: async () => {
-          const runtime = ManagedRuntime.make(Layer.mergeAll(Skill.defaultLayer, Ripgrep.defaultLayer))
+          const runtime = ManagedRuntime.make(Layer.mergeAll(Skill.defaultLayer, Ripgrep.defaultLayer, Truncate.defaultLayer, Agent.defaultLayer))
           const info = await runtime.runPromise(SkillTool)
           const tool = await runtime.runPromise(info.init())
           const requests: Array<Omit<Permission.Request, "id" | "sessionID" | "tool">> = []
diff --git a/packages/opencode/test/tool/task.test.ts b/packages/opencode/test/tool/task.test.ts
index e2ae52bf05..436c46490b 100644
--- a/packages/opencode/test/tool/task.test.ts
+++ b/packages/opencode/test/tool/task.test.ts
@@ -10,6 +10,7 @@ import type { SessionPrompt } from "../../src/session/prompt"
 import { MessageID, PartID } from "../../src/session/schema"
 import { ModelID, ProviderID } from "../../src/provider/schema"
 import { TaskTool, type TaskPromptOps } from "../../src/tool/task"
+import { Truncate } from "../../src/tool/truncate"
 import { ToolRegistry } from "../../src/tool/registry"
 import { provideTmpdirInstance } from "../fixture/fixture"
 import { testEffect } from "../lib/effect"
@@ -29,6 +30,7 @@ const it = testEffect(
     Config.defaultLayer,
     CrossSpawnSpawner.defaultLayer,
     Session.defaultLayer,
+    Truncate.defaultLayer,
     ToolRegistry.defaultLayer,
   ),
 )
diff --git a/packages/opencode/test/tool/tool-define.test.ts b/packages/opencode/test/tool/tool-define.test.ts
index 425c83ffdd..b8003e475d 100644
--- a/packages/opencode/test/tool/tool-define.test.ts
+++ b/packages/opencode/test/tool/tool-define.test.ts
@@ -1,7 +1,11 @@
 import { describe, test, expect } from "bun:test"
-import { Effect } from "effect"
+import { Effect, Layer, ManagedRuntime } from "effect"
 import z from "zod"
+import { Agent } from "../../src/agent/agent"
 import { Tool } from "../../src/tool/tool"
+import { Truncate } from "../../src/tool/truncate"
+
+const runtime = ManagedRuntime.make(Layer.mergeAll(Truncate.defaultLayer, Agent.defaultLayer))
 
 const params = z.object({ input: z.string() })
 
@@ -21,7 +25,7 @@ describe("Tool.define", () => {
     const original = makeTool("test")
     const originalExecute = original.execute
 
-    const info = await Effect.runPromise(Tool.define("test-tool", Effect.succeed(original)))
+    const info = await runtime.runPromise(Tool.define("test-tool", Effect.succeed(original)))
 
     await Effect.runPromise(info.init())
     await Effect.runPromise(info.init())
@@ -31,7 +35,7 @@ describe("Tool.define", () => {
   })
 
   test("effect-defined tool returns fresh objects and is unaffected", async () => {
-    const info = await Effect.runPromise(
+    const info = await runtime.runPromise(
       Tool.define(
         "test-fn-tool",
         Effect.succeed(() => Effect.succeed(makeTool("test"))),
@@ -45,7 +49,7 @@ describe("Tool.define", () => {
   })
 
   test("object-defined tool returns distinct objects per init() call", async () => {
-    const info = await Effect.runPromise(Tool.define("test-copy", Effect.succeed(makeTool("test"))))
+    const info = await runtime.runPromise(Tool.define("test-copy", Effect.succeed(makeTool("test"))))
 
     const first = await Effect.runPromise(info.init())
     const second = await Effect.runPromise(info.init())
diff --git a/packages/opencode/test/tool/truncation.test.ts b/packages/opencode/test/tool/truncation.test.ts
index 9ec5b78400..493cd9d7e1 100644
--- a/packages/opencode/test/tool/truncation.test.ts
+++ b/packages/opencode/test/tool/truncation.test.ts
@@ -1,7 +1,7 @@
 import { describe, test, expect } from "bun:test"
 import { NodeFileSystem } from "@effect/platform-node"
 import { Effect, FileSystem, Layer } from "effect"
-import { Truncate, Truncate as TruncateSvc } from "../../src/tool/truncate"
+import { Truncate } from "../../src/tool/truncate"
 import { Identifier } from "../../src/id/id"
 import { Process } from "../../src/util/process"
 import { Filesystem } from "../../src/util/filesystem"
@@ -12,120 +12,155 @@ import { writeFileStringScoped } from "../lib/filesystem"
 const FIXTURES_DIR = path.join(import.meta.dir, "fixtures")
 const ROOT = path.resolve(import.meta.dir, "..", "..")
 
+const it = testEffect(Layer.mergeAll(Truncate.defaultLayer, NodeFileSystem.layer))
+
 describe("Truncate", () => {
   describe("output", () => {
-    test("truncates large json file by bytes", async () => {
-      const content = await Filesystem.readText(path.join(FIXTURES_DIR, "models-api.json"))
-      const result = await Truncate.output(content)
+    it.live("truncates large json file by bytes", () =>
+      Effect.gen(function* () {
+        const svc = yield* Truncate.Service
+        const content = yield* Effect.promise(() => Filesystem.readText(path.join(FIXTURES_DIR, "models-api.json")))
+        const result = yield* svc.output(content)
 
-      expect(result.truncated).toBe(true)
-      expect(result.content).toContain("truncated...")
-      if (result.truncated) expect(result.outputPath).toBeDefined()
-    })
+        expect(result.truncated).toBe(true)
+        expect(result.content).toContain("truncated...")
+        if (result.truncated) expect(result.outputPath).toBeDefined()
+      }),
+    )
 
-    test("returns content unchanged when under limits", async () => {
-      const content = "line1\nline2\nline3"
-      const result = await Truncate.output(content)
+    it.live("returns content unchanged when under limits", () =>
+      Effect.gen(function* () {
+        const svc = yield* Truncate.Service
+        const content = "line1\nline2\nline3"
+        const result = yield* svc.output(content)
 
-      expect(result.truncated).toBe(false)
-      expect(result.content).toBe(content)
-    })
+        expect(result.truncated).toBe(false)
+        expect(result.content).toBe(content)
+      }),
+    )
 
-    test("truncates by line count", async () => {
-      const lines = Array.from({ length: 100 }, (_, i) => `line${i}`).join("\n")
-      const result = await Truncate.output(lines, { maxLines: 10 })
+    it.live("truncates by line count", () =>
+      Effect.gen(function* () {
+        const svc = yield* Truncate.Service
+        const lines = Array.from({ length: 100 }, (_, i) => `line${i}`).join("\n")
+        const result = yield* svc.output(lines, { maxLines: 10 })
 
-      expect(result.truncated).toBe(true)
-      expect(result.content).toContain("...90 lines truncated...")
-    })
+        expect(result.truncated).toBe(true)
+        expect(result.content).toContain("...90 lines truncated...")
+      }),
+    )
 
-    test("truncates by byte count", async () => {
-      const content = "a".repeat(1000)
-      const result = await Truncate.output(content, { maxBytes: 100 })
+    it.live("truncates by byte count", () =>
+      Effect.gen(function* () {
+        const svc = yield* Truncate.Service
+        const content = "a".repeat(1000)
+        const result = yield* svc.output(content, { maxBytes: 100 })
 
-      expect(result.truncated).toBe(true)
-      expect(result.content).toContain("truncated...")
-    })
+        expect(result.truncated).toBe(true)
+        expect(result.content).toContain("truncated...")
+      }),
+    )
 
-    test("truncates from head by default", async () => {
-      const lines = Array.from({ length: 10 }, (_, i) => `line${i}`).join("\n")
-      const result = await Truncate.output(lines, { maxLines: 3 })
+    it.live("truncates from head by default", () =>
+      Effect.gen(function* () {
+        const svc = yield* Truncate.Service
+        const lines = Array.from({ length: 10 }, (_, i) => `line${i}`).join("\n")
+        const result = yield* svc.output(lines, { maxLines: 3 })
 
-      expect(result.truncated).toBe(true)
-      expect(result.content).toContain("line0")
-      expect(result.content).toContain("line1")
-      expect(result.content).toContain("line2")
-      expect(result.content).not.toContain("line9")
-    })
+        expect(result.truncated).toBe(true)
+        expect(result.content).toContain("line0")
+        expect(result.content).toContain("line1")
+        expect(result.content).toContain("line2")
+        expect(result.content).not.toContain("line9")
+      }),
+    )
 
-    test("truncates from tail when direction is tail", async () => {
-      const lines = Array.from({ length: 10 }, (_, i) => `line${i}`).join("\n")
-      const result = await Truncate.output(lines, { maxLines: 3, direction: "tail" })
+    it.live("truncates from tail when direction is tail", () =>
+      Effect.gen(function* () {
+        const svc = yield* Truncate.Service
+        const lines = Array.from({ length: 10 }, (_, i) => `line${i}`).join("\n")
+        const result = yield* svc.output(lines, { maxLines: 3, direction: "tail" })
 
-      expect(result.truncated).toBe(true)
-      expect(result.content).toContain("line7")
-      expect(result.content).toContain("line8")
-      expect(result.content).toContain("line9")
-      expect(result.content).not.toContain("line0")
-    })
+        expect(result.truncated).toBe(true)
+        expect(result.content).toContain("line7")
+        expect(result.content).toContain("line8")
+        expect(result.content).toContain("line9")
+        expect(result.content).not.toContain("line0")
+      }),
+    )
 
     test("uses default MAX_LINES and MAX_BYTES", () => {
       expect(Truncate.MAX_LINES).toBe(2000)
       expect(Truncate.MAX_BYTES).toBe(50 * 1024)
     })
 
-    test("large single-line file truncates with byte message", async () => {
-      const content = await Filesystem.readText(path.join(FIXTURES_DIR, "models-api.json"))
-      const result = await Truncate.output(content)
+    it.live("large single-line file truncates with byte message", () =>
+      Effect.gen(function* () {
+        const svc = yield* Truncate.Service
+        const content = yield* Effect.promise(() => Filesystem.readText(path.join(FIXTURES_DIR, "models-api.json")))
+        const result = yield* svc.output(content)
 
-      expect(result.truncated).toBe(true)
-      expect(result.content).toContain("bytes truncated...")
-      expect(Buffer.byteLength(content, "utf-8")).toBeGreaterThan(Truncate.MAX_BYTES)
-    })
+        expect(result.truncated).toBe(true)
+        expect(result.content).toContain("bytes truncated...")
+        expect(Buffer.byteLength(content, "utf-8")).toBeGreaterThan(Truncate.MAX_BYTES)
+      }),
+    )
 
-    test("writes full output to file when truncated", async () => {
-      const lines = Array.from({ length: 100 }, (_, i) => `line${i}`).join("\n")
-      const result = await Truncate.output(lines, { maxLines: 10 })
+    it.live("writes full output to file when truncated", () =>
+      Effect.gen(function* () {
+        const svc = yield* Truncate.Service
+        const lines = Array.from({ length: 100 }, (_, i) => `line${i}`).join("\n")
+        const result = yield* svc.output(lines, { maxLines: 10 })
 
-      expect(result.truncated).toBe(true)
-      expect(result.content).toContain("The tool call succeeded but the output was truncated")
-      expect(result.content).toContain("Grep")
-      if (!result.truncated) throw new Error("expected truncated")
-      expect(result.outputPath).toBeDefined()
-      expect(result.outputPath).toContain("tool_")
+        expect(result.truncated).toBe(true)
+        expect(result.content).toContain("The tool call succeeded but the output was truncated")
+        expect(result.content).toContain("Grep")
+        if (!result.truncated) throw new Error("expected truncated")
+        expect(result.outputPath).toBeDefined()
+        expect(result.outputPath).toContain("tool_")
 
-      const written = await Filesystem.readText(result.outputPath!)
-      expect(written).toBe(lines)
-    })
+        const written = yield* Effect.promise(() => Filesystem.readText(result.outputPath!))
+        expect(written).toBe(lines)
+      }),
+    )
 
-    test("suggests Task tool when agent has task permission", async () => {
-      const lines = Array.from({ length: 100 }, (_, i) => `line${i}`).join("\n")
-      const agent = { permission: [{ permission: "task", pattern: "*", action: "allow" as const }] }
-      const result = await Truncate.output(lines, { maxLines: 10 }, agent as any)
+    it.live("suggests Task tool when agent has task permission", () =>
+      Effect.gen(function* () {
+        const svc = yield* Truncate.Service
+        const lines = Array.from({ length: 100 }, (_, i) => `line${i}`).join("\n")
+        const agent = { permission: [{ permission: "task", pattern: "*", action: "allow" as const }] }
+        const result = yield* svc.output(lines, { maxLines: 10 }, agent as any)
 
-      expect(result.truncated).toBe(true)
-      expect(result.content).toContain("Grep")
-      expect(result.content).toContain("Task tool")
-    })
+        expect(result.truncated).toBe(true)
+        expect(result.content).toContain("Grep")
+        expect(result.content).toContain("Task tool")
+      }),
+    )
 
-    test("omits Task tool hint when agent lacks task permission", async () => {
-      const lines = Array.from({ length: 100 }, (_, i) => `line${i}`).join("\n")
-      const agent = { permission: [{ permission: "task", pattern: "*", action: "deny" as const }] }
-      const result = await Truncate.output(lines, { maxLines: 10 }, agent as any)
+    it.live("omits Task tool hint when agent lacks task permission", () =>
+      Effect.gen(function* () {
+        const svc = yield* Truncate.Service
+        const lines = Array.from({ length: 100 }, (_, i) => `line${i}`).join("\n")
+        const agent = { permission: [{ permission: "task", pattern: "*", action: "deny" as const }] }
+        const result = yield* svc.output(lines, { maxLines: 10 }, agent as any)
 
-      expect(result.truncated).toBe(true)
-      expect(result.content).toContain("Grep")
-      expect(result.content).not.toContain("Task tool")
-    })
+        expect(result.truncated).toBe(true)
+        expect(result.content).toContain("Grep")
+        expect(result.content).not.toContain("Task tool")
+      }),
+    )
 
-    test("does not write file when not truncated", async () => {
-      const content = "short content"
-      const result = await Truncate.output(content)
+    it.live("does not write file when not truncated", () =>
+      Effect.gen(function* () {
+        const svc = yield* Truncate.Service
+        const content = "short content"
+        const result = yield* svc.output(content)
 
-      expect(result.truncated).toBe(false)
-      if (result.truncated) throw new Error("expected not truncated")
-      expect("outputPath" in result).toBe(false)
-    })
+        expect(result.truncated).toBe(false)
+        if (result.truncated) throw new Error("expected not truncated")
+        expect("outputPath" in result).toBe(false)
+      }),
+    )
 
     test("loads truncate effect in a fresh process", async () => {
       const out = await Process.run([process.execPath, "run", path.join(ROOT, "src", "tool", "truncate.ts")], {
@@ -138,10 +173,10 @@ describe("Truncate", () => {
 
   describe("cleanup", () => {
     const DAY_MS = 24 * 60 * 60 * 1000
-    const it = testEffect(Layer.mergeAll(TruncateSvc.defaultLayer, NodeFileSystem.layer))
 
     it.live("deletes files older than 7 days and preserves recent files", () =>
       Effect.gen(function* () {
+        const svc = yield* Truncate.Service
         const fs = yield* FileSystem.FileSystem
 
         yield* fs.makeDirectory(Truncate.DIR, { recursive: true })
@@ -151,7 +186,7 @@ describe("Truncate", () => {
 
         yield* writeFileStringScoped(old, "old content")
         yield* writeFileStringScoped(recent, "recent content")
-        yield* TruncateSvc.Service.use((s) => s.cleanup())
+        yield* svc.cleanup()
 
         expect(yield* fs.exists(old)).toBe(false)
         expect(yield* fs.exists(recent)).toBe(true)
diff --git a/packages/opencode/test/tool/webfetch.test.ts b/packages/opencode/test/tool/webfetch.test.ts
index c6b2fd331c..7d2ff1dcab 100644
--- a/packages/opencode/test/tool/webfetch.test.ts
+++ b/packages/opencode/test/tool/webfetch.test.ts
@@ -1,7 +1,9 @@
 import { describe, expect, test } from "bun:test"
 import path from "path"
-import { Effect } from "effect"
+import { Effect, Layer } from "effect"
 import { FetchHttpClient } from "effect/unstable/http"
+import { Agent } from "../../src/agent/agent"
+import { Truncate } from "../../src/tool/truncate"
 import { Instance } from "../../src/project/instance"
 import { WebFetchTool } from "../../src/tool/webfetch"
 import { SessionID, MessageID } from "../../src/session/schema"
@@ -24,10 +26,11 @@ async function withFetch(fetch: (req: Request) => Response | Promise<Response>,
   await fn(server.url)
 }
 
-function initTool() {
+function exec(args: { url: string; format: "text" | "markdown" | "html" }) {
   return WebFetchTool.pipe(
     Effect.flatMap((info) => info.init()),
-    Effect.provide(FetchHttpClient.layer),
+    Effect.flatMap((tool) => tool.execute(args, ctx)),
+    Effect.provide(Layer.mergeAll(FetchHttpClient.layer, Truncate.defaultLayer, Agent.defaultLayer)),
     Effect.runPromise,
   )
 }
@@ -41,10 +44,7 @@ describe("tool.webfetch", () => {
         await Instance.provide({
           directory: projectRoot,
           fn: async () => {
-            const webfetch = await initTool()
-            const result = await Effect.runPromise(
-              webfetch.execute({ url: new URL("/image.png", url).toString(), format: "markdown" }, ctx),
-            )
+            const result = await exec({ url: new URL("/image.png", url).toString(), format: "markdown" })
             expect(result.output).toBe("Image fetched successfully")
             expect(result.attachments).toBeDefined()
             expect(result.attachments?.length).toBe(1)
@@ -72,10 +72,7 @@ describe("tool.webfetch", () => {
         await Instance.provide({
           directory: projectRoot,
           fn: async () => {
-            const webfetch = await initTool()
-            const result = await Effect.runPromise(
-              webfetch.execute({ url: new URL("/image.svg", url).toString(), format: "html" }, ctx),
-            )
+            const result = await exec({ url: new URL("/image.svg", url).toString(), format: "html" })
             expect(result.output).toContain("<svg")
             expect(result.attachments).toBeUndefined()
           },
@@ -95,10 +92,7 @@ describe("tool.webfetch", () => {
         await Instance.provide({
           directory: projectRoot,
           fn: async () => {
-            const webfetch = await initTool()
-            const result = await Effect.runPromise(
-              webfetch.execute({ url: new URL("/file.txt", url).toString(), format: "text" }, ctx),
-            )
+            const result = await exec({ url: new URL("/file.txt", url).toString(), format: "text" })
             expect(result.output).toBe("hello from webfetch")
             expect(result.attachments).toBeUndefined()
           },
diff --git a/packages/opencode/test/tool/write.test.ts b/packages/opencode/test/tool/write.test.ts
index 3607a9272e..f7daa1e971 100644
--- a/packages/opencode/test/tool/write.test.ts
+++ b/packages/opencode/test/tool/write.test.ts
@@ -9,7 +9,9 @@ import { AppFileSystem } from "../../src/filesystem"
 import { FileTime } from "../../src/file/time"
 import { Bus } from "../../src/bus"
 import { Format } from "../../src/format"
+import { Truncate } from "../../src/tool/truncate"
 import { Tool } from "../../src/tool/tool"
+import { Agent } from "../../src/agent/agent"
 import { SessionID, MessageID } from "../../src/session/schema"
 import * as CrossSpawnSpawner from "../../src/effect/cross-spawn-spawner"
 import { provideTmpdirInstance } from "../fixture/fixture"
@@ -38,6 +40,8 @@ const it = testEffect(
     Bus.layer,
     Format.defaultLayer,
     CrossSpawnSpawner.defaultLayer,
+    Truncate.defaultLayer,
+    Agent.defaultLayer,
   ),
 )