refactor(tool): convert codesearch to defineEffect with HttpClient

Replace raw fetch with Effect HttpClient service. Remove manual
AbortController/signal/clearTimeout plumbing — fiber interruption
and Effect.timeout handle cancellation natively.

packages/opencode/src/tool/codesearch.ts

@@ -1,132 +1,99 @@
 import z from "zod"
+import { Effect } from "effect"
+import { HttpClient, HttpClientRequest } from "effect/unstable/http"
 import { Tool } from "./tool"
 import DESCRIPTION from "./codesearch.txt"
-import { abortAfterAny } from "../util/abort"
 
-const API_CONFIG = {
-  BASE_URL: "https://mcp.exa.ai",
-  ENDPOINTS: {
-    CONTEXT: "/mcp",
-  },
-} as const
+const URL = "https://mcp.exa.ai/mcp"
 
-interface McpCodeRequest {
-  jsonrpc: string
-  id: number
-  method: string
-  params: {
-    name: string
-    arguments: {
-      query: string
-      tokensNum: number
-    }
-  }
-}
+export const CodeSearchTool = Tool.defineEffect(
+  "codesearch",
+  Effect.gen(function* () {
+    const http = yield* HttpClient.HttpClient
 
-interface McpCodeResponse {
-  jsonrpc: string
-  result: {
-    content: Array<{
-      type: string
-      text: string
-    }>
-  }
-}
+    return {
+      description: DESCRIPTION,
+      parameters: z.object({
+        query: z
+          .string()
+          .describe(
+            "Search query to find relevant context for APIs, Libraries, and SDKs. For example, 'React useState hook examples', 'Python pandas dataframe filtering', 'Express.js middleware', 'Next js partial prerendering configuration'",
+          ),
+        tokensNum: z
+          .number()
+          .min(1000)
+          .max(50000)
+          .default(5000)
+          .describe(
+            "Number of tokens to return (1000-50000). Default is 5000 tokens. Adjust this value based on how much context you need - use lower values for focused queries and higher values for comprehensive documentation.",
+          ),
+      }),
+      execute: (params: { query: string; tokensNum: number }, ctx: Tool.Context) =>
+        Effect.gen(function* () {
+          yield* Effect.promise(() =>
+            ctx.ask({
+              permission: "codesearch",
+              patterns: [params.query],
+              always: ["*"],
+              metadata: {
+                query: params.query,
+                tokensNum: params.tokensNum,
+              },
+            }),
+          )
 
-export const CodeSearchTool = Tool.define("codesearch", {
-  description: DESCRIPTION,
-  parameters: z.object({
-    query: z
-      .string()
-      .describe(
-        "Search query to find relevant context for APIs, Libraries, and SDKs. For example, 'React useState hook examples', 'Python pandas dataframe filtering', 'Express.js middleware', 'Next js partial prerendering configuration'",
-      ),
-    tokensNum: z
-      .number()
-      .min(1000)
-      .max(50000)
-      .default(5000)
-      .describe(
-        "Number of tokens to return (1000-50000). Default is 5000 tokens. Adjust this value based on how much context you need - use lower values for focused queries and higher values for comprehensive documentation.",
-      ),
-  }),
-  async execute(params, ctx) {
-    await ctx.ask({
-      permission: "codesearch",
-      patterns: [params.query],
-      always: ["*"],
-      metadata: {
-        query: params.query,
-        tokensNum: params.tokensNum,
-      },
-    })
+          const request = HttpClientRequest.post(URL).pipe(
+            HttpClientRequest.setHeaders({
+              accept: "application/json, text/event-stream",
+              "content-type": "application/json",
+            }),
+            HttpClientRequest.bodyJsonUnsafe({
+              jsonrpc: "2.0",
+              id: 1,
+              method: "tools/call",
+              params: {
+                name: "get_code_context_exa",
+                arguments: {
+                  query: params.query,
+                  tokensNum: params.tokensNum || 5000,
+                },
+              },
+            }),
+          )
 
-    const codeRequest: McpCodeRequest = {
-      jsonrpc: "2.0",
-      id: 1,
-      method: "tools/call",
-      params: {
-        name: "get_code_context_exa",
-        arguments: {
-          query: params.query,
-          tokensNum: params.tokensNum || 5000,
-        },
-      },
-    }
+          const response = yield* http.execute(request).pipe(Effect.timeout("30 seconds"))
 
-    const { signal, clearTimeout } = abortAfterAny(30000, ctx.abort)
+          if (response.status < 200 || response.status >= 300) {
+            const errorText = yield* response.text
+            throw new Error(`Code search error (${response.status}): ${errorText}`)
+          }
 
-    try {
-      const headers: Record<string, string> = {
-        accept: "application/json, text/event-stream",
-        "content-type": "application/json",
-      }
+          const responseText = yield* response.text
 
-      const response = await fetch(`${API_CONFIG.BASE_URL}${API_CONFIG.ENDPOINTS.CONTEXT}`, {
-        method: "POST",
-        headers,
-        body: JSON.stringify(codeRequest),
-        signal,
-      })
-
-      clearTimeout()
-
-      if (!response.ok) {
-        const errorText = await response.text()
-        throw new Error(`Code search error (${response.status}): ${errorText}`)
-      }
-
-      const responseText = await response.text()
-
-      // Parse SSE response
-      const lines = responseText.split("\n")
-      for (const line of lines) {
-        if (line.startsWith("data: ")) {
-          const data: McpCodeResponse = JSON.parse(line.substring(6))
-          if (data.result && data.result.content && data.result.content.length > 0) {
-            return {
-              output: data.result.content[0].text,
-              title: `Code search: ${params.query}`,
-              metadata: {},
+          // Parse SSE response
+          for (const line of responseText.split("\n")) {
+            if (line.startsWith("data: ")) {
+              const data = JSON.parse(line.substring(6))
+              if (data.result?.content?.[0]?.text) {
+                return {
+                  output: data.result.content[0].text,
+                  title: `Code search: ${params.query}`,
+                  metadata: {},
+                }
+              }
             }
           }
-        }
-      }
 
-      return {
-        output:
-          "No code snippets or documentation found. Please try a different query, be more specific about the library or programming concept, or check the spelling of framework names.",
-        title: `Code search: ${params.query}`,
-        metadata: {},
-      }
-    } catch (error) {
-      clearTimeout()
-
-      if (error instanceof Error && error.name === "AbortError") {
-        throw new Error("Code search request timed out")
-      }
-
-      throw error
+          return {
+            output:
+              "No code snippets or documentation found. Please try a different query, be more specific about the library or programming concept, or check the spelling of framework names.",
+            title: `Code search: ${params.query}`,
+            metadata: {},
+          }
+        }).pipe(
+          Effect.catchTag("TimeoutError", () => Effect.die(new Error("Code search request timed out"))),
+          Effect.runPromise,
+        ),
     }
-  },
-})
+  }),
+)

packages/opencode/src/tool/registry.ts

@@ -28,6 +28,7 @@ import { Glob } from "../util/glob"
 import path from "path"
 import { pathToFileURL } from "url"
 import { Effect, Layer, ServiceMap } from "effect"
+import { FetchHttpClient, HttpClient } from "effect/unstable/http"
 import { InstanceState } from "@/effect/instance-state"
 import { makeRuntime } from "@/effect/run-service"
 import { Env } from "../env"
@@ -80,6 +81,7 @@ export namespace ToolRegistry {
     | FileTime.Service
     | Instruction.Service
     | AppFileSystem.Service
+    | HttpClient.HttpClient
   > = Layer.effect(
     Service,
     Effect.gen(function* () {
@@ -92,6 +94,7 @@ export namespace ToolRegistry {
       const read = yield* ReadTool
       const question = yield* QuestionTool
       const todo = yield* TodoWriteTool
+      const codesearch = yield* CodeSearchTool
 
       const state = yield* InstanceState.make<State>(
         Effect.fn("ToolRegistry.state")(function* (ctx) {
@@ -160,7 +163,7 @@ export namespace ToolRegistry {
             fetch: Tool.init(WebFetchTool),
             todo: Tool.init(todo),
             search: Tool.init(WebSearchTool),
-            code: Tool.init(CodeSearchTool),
+            code: Tool.init(codesearch),
             skill: Tool.init(SkillTool),
             patch: Tool.init(ApplyPatchTool),
             question: Tool.init(question),
@@ -301,6 +304,7 @@ export namespace ToolRegistry {
       Layer.provide(FileTime.defaultLayer),
       Layer.provide(Instruction.defaultLayer),
       Layer.provide(AppFileSystem.defaultLayer),
+      Layer.provide(FetchHttpClient.layer),
     ),
   )
 

packages/opencode/test/session/prompt-effect.test.ts

@@ -1,4 +1,5 @@
 import { NodeFileSystem } from "@effect/platform-node"
+import { FetchHttpClient } from "effect/unstable/http"
 import { expect } from "bun:test"
 import { Cause, Effect, Exit, Fiber, Layer } from "effect"
 import path from "path"
@@ -169,6 +170,7 @@ function makeHttp() {
   const todo = Todo.layer.pipe(Layer.provideMerge(deps))
   const registry = ToolRegistry.layer.pipe(
     Layer.provide(Skill.defaultLayer),
+    Layer.provide(FetchHttpClient.layer),
     Layer.provideMerge(todo),
     Layer.provideMerge(question),
     Layer.provideMerge(deps),

packages/opencode/test/session/snapshot-tool-race.test.ts

@@ -53,6 +53,7 @@ import { ToolRegistry } from "../../src/tool/registry"
 import { Truncate } from "../../src/tool/truncate"
 import { AppFileSystem } from "../../src/filesystem"
 import * as CrossSpawnSpawner from "../../src/effect/cross-spawn-spawner"
+import { FetchHttpClient } from "effect/unstable/http"
 
 Log.init({ print: false })
 
@@ -134,6 +135,7 @@ function makeHttp() {
   const todo = Todo.layer.pipe(Layer.provideMerge(deps))
   const registry = ToolRegistry.layer.pipe(
     Layer.provide(Skill.defaultLayer),
+    Layer.provide(FetchHttpClient.layer),
     Layer.provideMerge(todo),
     Layer.provideMerge(question),
     Layer.provideMerge(deps),