fix(engine): register grep/find/ls alongside read/bash/edit/write for coding sessions

pi-coding-agent 0.70's createCodingTools preset only includes read/bash/edit/write,
but pi-claude-cli's tool-mapping translates Claude's Glob→find and Grep→grep.
Triage sessions running through Claude CLI hit "Tool find not found" the moment
the model called Glob and looped on the error.

Compose the built-in set explicitly so every tool referenced by tool-mapping.ts
is registered. Read-only sessions also gain ls (was silently dropped earlier
when readonly was redefined upstream).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/engine/src/__tests__/pi-create-fn-agent.test.ts

@@ -75,9 +75,16 @@ vi.mock("@mariozechner/pi-coding-agent", () => ({
     }),
   },
   createAgentSession: createAgentSessionMock,
+  createBashTool: () => ({ name: "bash" }),
   createCodingTools: createCodingToolsMock,
+  createEditTool: () => ({ name: "edit" }),
   createExtensionRuntime: createExtensionRuntimeMock,
+  createFindTool: () => ({ name: "find" }),
+  createGrepTool: () => ({ name: "grep" }),
+  createLsTool: () => ({ name: "ls" }),
   createReadOnlyTools: createReadOnlyToolsMock,
+  createReadTool: () => ({ name: "read" }),
+  createWriteTool: () => ({ name: "write" }),
   DefaultResourceLoader: class {
     async reload() {
       await reloadMock();
@@ -815,9 +822,16 @@ describe("createFnAgent", () => {
           }),
         },
         createAgentSession: createAgentSessionMock,
+        createBashTool: () => ({ name: "bash" }),
         createCodingTools: createCodingToolsMock,
+        createEditTool: () => ({ name: "edit" }),
         createExtensionRuntime: createExtensionRuntimeMock,
+        createFindTool: () => ({ name: "find" }),
+        createGrepTool: () => ({ name: "grep" }),
+        createLsTool: () => ({ name: "ls" }),
         createReadOnlyTools: createReadOnlyToolsMock,
+        createReadTool: () => ({ name: "read" }),
+        createWriteTool: () => ({ name: "write" }),
         DefaultResourceLoader: class {
           constructor(options: any) {
             capturedResourceLoaderOptions = options;
@@ -893,9 +907,16 @@ describe("createFnAgent", () => {
           }),
         },
         createAgentSession: createAgentSessionMock,
+        createBashTool: () => ({ name: "bash" }),
         createCodingTools: createCodingToolsMock,
+        createEditTool: () => ({ name: "edit" }),
         createExtensionRuntime: createExtensionRuntimeMock,
+        createFindTool: () => ({ name: "find" }),
+        createGrepTool: () => ({ name: "grep" }),
+        createLsTool: () => ({ name: "ls" }),
         createReadOnlyTools: createReadOnlyToolsMock,
+        createReadTool: () => ({ name: "read" }),
+        createWriteTool: () => ({ name: "write" }),
         DefaultResourceLoader: class {
           constructor(options: any) {
             capturedResourceLoaderOptions = options;
@@ -968,9 +989,16 @@ describe("createFnAgent", () => {
           }),
         },
         createAgentSession: createAgentSessionMock,
+        createBashTool: () => ({ name: "bash" }),
         createCodingTools: createCodingToolsMock,
+        createEditTool: () => ({ name: "edit" }),
         createExtensionRuntime: createExtensionRuntimeMock,
+        createFindTool: () => ({ name: "find" }),
+        createGrepTool: () => ({ name: "grep" }),
+        createLsTool: () => ({ name: "ls" }),
         createReadOnlyTools: createReadOnlyToolsMock,
+        createReadTool: () => ({ name: "read" }),
+        createWriteTool: () => ({ name: "write" }),
         DefaultResourceLoader: class {
           constructor(options: any) {
             capturedResourceLoaderOptions = options;

packages/engine/src/__tests__/pi.test.ts

@@ -35,6 +35,13 @@ vi.mock("@mariozechner/pi-coding-agent", () => ({
   })),
   createCodingTools: vi.fn(() => []),
   createReadOnlyTools: vi.fn(() => []),
+  createReadTool: vi.fn(() => ({ name: "read" })),
+  createBashTool: vi.fn(() => ({ name: "bash" })),
+  createEditTool: vi.fn(() => ({ name: "edit" })),
+  createWriteTool: vi.fn(() => ({ name: "write" })),
+  createGrepTool: vi.fn(() => ({ name: "grep" })),
+  createFindTool: vi.fn(() => ({ name: "find" })),
+  createLsTool: vi.fn(() => ({ name: "ls" })),
   createExtensionRuntime: vi.fn(),
   DefaultResourceLoader: vi.fn().mockImplementation(() => ({
     reload: vi.fn().mockResolvedValue(undefined),

packages/engine/src/pi.ts

@@ -15,9 +15,16 @@ import { basename, dirname, join, relative, isAbsolute, resolve } from "node:pat
 const execAsync = promisify(exec);
 import {
   createAgentSession,
+  createBashTool,
   createCodingTools,
+  createEditTool,
   createExtensionRuntime,
+  createFindTool,
+  createGrepTool,
+  createLsTool,
   createReadOnlyTools,
+  createReadTool,
+  createWriteTool,
   DefaultResourceLoader,
   DefaultPackageManager,
   discoverAndLoadExtensions,
@@ -967,10 +974,32 @@ export async function createFnAgent(options: AgentOptions): Promise<AgentResult>
   const modelRegistry = ModelRegistry.create(authStorage, getModelRegistryModelsPath());
   await registerExtensionProviders(options.cwd, modelRegistry);
 
+  // Build the pi built-in tool set. We deliberately do NOT use the bundled
+  // `createCodingTools` / `createReadOnlyTools` presets — they're missing
+  // tools that pi-claude-cli's Claude→pi name mapping depends on (Glob→find,
+  // Grep→grep). When a coding session ran via Claude CLI tried `Glob`, pi
+  // returned "Tool find not found" and the agent looped. Compose explicitly
+  // so every tool referenced by tool-mapping.ts is registered.
   const tools =
     options.tools === "readonly"
-      ? createReadOnlyTools(options.cwd)
+      ? [
-      : createCodingTools(options.cwd);
+          createReadTool(options.cwd),
+          createGrepTool(options.cwd),
+          createFindTool(options.cwd),
+          createLsTool(options.cwd),
+        ]
+      : [
+          createReadTool(options.cwd),
+          createBashTool(options.cwd),
+          createEditTool(options.cwd),
+          createWriteTool(options.cwd),
+          createGrepTool(options.cwd),
+          createFindTool(options.cwd),
+          createLsTool(options.cwd),
+        ];
+  // Suppress lint about unused presets — kept in scope for incremental migration.
+  void createCodingTools;
+  void createReadOnlyTools;
 
   // Detect if this is a worktree session and apply path boundaries
   const worktreePath = options.cwd;