--- phase: 02-tool-handling verified: 2026-03-14T11:35:00Z status: passed score: 8/8 must-haves verified re_verification: false --- # Phase 2: Tool Handling Verification Report **Phase Goal:** Claude proposes tool calls that pi intercepts, translates, and executes natively -- the "Claude proposes, pi executes" loop works **Verified:** 2026-03-14T11:35:00Z **Status:** passed **Re-verification:** No -- initial verification ## Goal Achievement ### Observable Truths (from ROADMAP.md Success Criteria) | # | Truth | Status | Evidence | |----|------------------------------------------------------------------------------------------------------------|------------|---------------------------------------------------------------------------------------------------| | 1 | When Claude wants to read a file, pi receives a tool call with pi name `read` and translated arg `path` | VERIFIED | `event-bridge.ts` maps via `mapClaudeToolNameToPi` + `translateClaudeArgsToPi` at block_stop | | 2 | Claude's built-in tool execution is denied via control protocol -- tools never execute inside subprocess | VERIFIED | `control-handler.ts` `handleControlRequest` always writes `behavior: "deny"` for non-MCP tools | | 3 | MCP-prefixed tool calls are allowed through the control protocol without denial | VERIFIED | `handleControlRequest` checks `tool_name.startsWith("mcp__")` and writes `behavior: "allow"` | | 4 | Pi receives `toolcall_start`, `toolcall_delta`, and `toolcall_end` events with correct names/args | VERIFIED | `event-bridge.ts` emits all three events for `tool_use` content blocks; 9 event-bridge tests cover this | **Score:** 4/4 ROADMAP success criteria verified ### Must-Have Truths (from PLAN frontmatter -- Plan 01) | # | Truth | Status | Evidence | |----|--------------------------------------------------------------------------------|------------|-------------------------------------------------------------------------------------------------------| | 1 | Claude tool name 'Read' maps to pi name 'read' and vice versa for all 6 tools | VERIFIED | `TOOL_MAPPINGS` array in `tool-mapping.ts` covers all 6; 8 name-mapping tests pass | | 2 | Pi names 'find' AND 'glob' both map back to Claude's 'Glob' | VERIFIED | `PI_TO_CLAUDE_NAME["glob"] = "Glob"` added explicitly after loop; dedicated test passes | | 3 | Claude arg 'file_path' maps to pi arg 'path' for Read/Write/Edit tools | VERIFIED | `CLAUDE_TO_PI_ARGS` entries confirmed; 5 arg-translation tests pass | | 4 | Unknown tool names pass through unchanged in both directions | VERIFIED | `?? claudeName` / `?? piName` fallback in both mapping functions; passthrough tests pass | | 5 | Unknown arguments pass through unchanged (not dropped) | VERIFIED | Translation iterates input keys and only renames known ones; "preserves unknown args" test passes | | 6 | Built-in tool control_requests are denied with correct message | VERIFIED | Deny message constant `TOOL_EXECUTION_DENIED_MESSAGE` exported and included in response; 7 tests cover this | | 7 | MCP-prefixed tool control_requests are allowed | VERIFIED | `mcp__` prefix check in `handleControlRequest`; 3 allow tests pass | | 8 | Control response includes matching request_id | VERIFIED | `request_id: msg.request_id` in `ControlResponse` construction; dedicated test verifies this | **Score Plan 01:** 8/8 truths verified ### Must-Have Truths (from PLAN frontmatter -- Plan 02) | # | Truth | Status | Evidence | |----|------------------------------------------------------------------------------------------------------------|------------|---------------------------------------------------------------------------------------------------| | 1 | When Claude streams tool_use block, pi receives toolcall_start, toolcall_delta, toolcall_end events | VERIFIED | Event bridge handles all three event types for `input_json_delta` deltas; 9 dedicated tests pass | | 2 | toolcall_start fires immediately with mapped tool name on content_block_start | VERIFIED | `handleContentBlockStart` creates `TrackedToolBlock`, calls `mapClaudeToolNameToPi`, pushes event | | 3 | toolcall_delta streams raw JSON argument fragments as they arrive | VERIFIED | `handleContentBlockDelta` pushes `event.delta!.partial_json` unchanged as `delta` field | | 4 | toolcall_end contains fully parsed and argument-mapped ToolCall object | VERIFIED | `handleContentBlockStop` parses, calls `translateClaudeArgsToPi(block.claudeName, parsed)`; test confirms `{ path: "/foo.ts" }` for `{ file_path: "/foo.ts" }` | | 5 | If JSON arg accumulation fails to parse, toolcall_end emits raw string instead of parsed object | VERIFIED | `catch` branch sets `finalArgs = block.partialJson`; dedicated "raw string" test passes | | 6 | control_request messages from stdout are intercepted and responded to on stdin | VERIFIED | `provider.ts` line 121-123: `else if (msg.type === "control_request") { handleControlRequest(msg, proc!.stdin!); }` | | 7 | Built-in tools are denied, MCP tools are allowed | VERIFIED | Routing goes through `handleControlRequest` which implements deny/allow; 2 provider tests confirm | | 8 | Prompt builder maps pi tool names and args back to Claude format for history replay | VERIFIED | `prompt-builder.ts` imports `mapPiToolNameToClaude` + `translatePiArgsToClaude`; 5 tests confirm | **Score Plan 02:** 8/8 truths verified --- ### Required Artifacts | Artifact | Expected | Status | Details | |-----------------------------------|----------------------------------------------------------------|------------|------------------------------------------------------------------------------------| | `src/tool-mapping.ts` | Single-source mapping table, 5 exports | VERIFIED | 112 lines, exports `TOOL_MAPPINGS`, `mapClaudeToolNameToPi`, `mapPiToolNameToClaude`, `translateClaudeArgsToPi`, `translatePiArgsToClaude` | | `src/control-handler.ts` | Control protocol handler, exports `handleControlRequest` + constant | VERIFIED | 74 lines, exports both `handleControlRequest` and `TOOL_EXECUTION_DENIED_MESSAGE`; also exports `MCP_PREFIX` | | `src/types.ts` | `ClaudeControlRequest` with `request_id` and nested `request` | VERIFIED | Lines 25-33 confirm wire protocol format with `request_id` and `request.{ subtype, tool_name, input }` | | `src/event-bridge.ts` | Tool_use content block handling with toolcall events | VERIFIED | `TrackedToolBlock` interface, `tool_use` branch in all three content block handlers | | `src/provider.ts` | control_request routing to `handleControlRequest` | VERIFIED | Line 121-123: `else if (msg.type === "control_request")` routes to handler | | `src/prompt-builder.ts` | Pi-to-Claude reverse mapping via `mapPiToolNameToClaude` | VERIFIED | Line 13 imports both functions; `contentToText` and `buildPrompt` use them | | `tests/tool-mapping.test.ts` | Unit tests for name mapping and arg translation | VERIFIED | 30 tests covering all 6 tools, asymmetry, passthrough, unknown args | | `tests/control-handler.test.ts` | Unit tests for control protocol deny/allow logic | VERIFIED | 17 tests covering deny, allow, response format, malformed input | | `tests/event-bridge.test.ts` | Tests for tool_use streaming (Phase 2 additions) | VERIFIED | 9 new tests in `tool_use content block streaming` describe block | | `tests/provider.test.ts` | Tests for control_request routing | VERIFIED | 2 new tests: routing test + stream-continues-after-control test | | `tests/prompt-builder.test.ts` | Tests for reverse name/arg mapping in history replay | VERIFIED | 5 tests in `tool name and argument reverse mapping` describe block | --- ### Key Link Verification **Plan 01 key links:** | From | To | Via | Status | Details | |---------------------------|-----------------------|-------------------------------------------------|---------|------------------------------------------------------------------------------| | `src/control-handler.ts` | `src/tool-mapping.ts` | imports `mapClaudeToolNameToPi` for MCP detection | NOT LINKED | Control handler uses `startsWith("mcp__")` directly -- does NOT import from tool-mapping | | `src/control-handler.ts` | `src/types.ts` | imports `ClaudeControlRequest` type | VERIFIED | Line 9: `import type { ClaudeControlRequest } from "./types";` | **Note on first key link:** The PLAN specified that `control-handler.ts` would import `mapClaudeToolNameToPi` "for MCP prefix detection." In practice, the implementation uses `tool_name.startsWith(MCP_PREFIX)` directly where `MCP_PREFIX = "mcp__"` is a constant defined in `control-handler.ts` itself. This is a correct and intentional deviation -- the MCP prefix check does not need the tool-mapping module. The behavior specified in the truth ("MCP-prefixed tool control_requests are allowed") is fully implemented and tested. This is a documentation artifact in the PLAN, not a code defect. **Plan 02 key links:** | From | To | Via | Status | Details | |---------------------------|-------------------------|----------------------------------------------------------------------|----------|--------------------------------------------------------------------------------------------| | `src/event-bridge.ts` | `src/tool-mapping.ts` | imports `mapClaudeToolNameToPi` and `translateClaudeArgsToPi` | VERIFIED | Line 11: `import { mapClaudeToolNameToPi, translateClaudeArgsToPi } from "./tool-mapping.js";` | | `src/provider.ts` | `src/control-handler.ts`| imports `handleControlRequest`, routes control_request messages | VERIFIED | Line 20: import; line 121-123: routing in `rl.on("line")` callback | | `src/prompt-builder.ts` | `src/tool-mapping.ts` | imports `mapPiToolNameToClaude` and `translatePiArgsToClaude` | VERIFIED | Line 13: `import { mapPiToolNameToClaude, translatePiArgsToClaude } from "./tool-mapping.js";` | --- ### Requirements Coverage | Requirement | Source Plan | Description | Status | Evidence | |-------------|-------------|--------------------------------------------------------------------------------------------------|------------|-----------------------------------------------------------------------------------| | STRM-03 | 02-01, 02-02| Extension sends `control_response` messages to deny or allow tool execution | SATISFIED | `handleControlRequest` writes JSON control_response to stdin; 17 tests confirm | | TOOL-01 | 02-01, 02-02| Extension denies all built-in tool execution requests via control protocol | SATISFIED | Non-`mcp__` tools always get `behavior: "deny"`; wired in provider.ts | | TOOL-02 | 02-01, 02-02| Extension allows `mcp__` prefixed tool execution via control protocol | SATISFIED | `startsWith("mcp__")` check returns `behavior: "allow"`; wired in provider.ts | | TOOL-03 | 02-01, 02-02| Extension maps tool names bidirectionally between Claude names and pi equivalents | SATISFIED | `TOOL_MAPPINGS` array + 4 functions cover all 6 tools bidirectionally | | TOOL-04 | 02-01, 02-02| Extension translates tool arguments between Claude and pi formats | SATISFIED | `translateClaudeArgsToPi` / `translatePiArgsToClaude` applied in event-bridge and prompt-builder | **All 5 phase requirements satisfied. No orphaned requirements found.** Traceability note: REQUIREMENTS.md lists STRM-03 and TOOL-01 through TOOL-04 as mapping to Phase 2 with status "Complete" -- consistent with this verification. --- ### Anti-Patterns Found | File | Line | Pattern | Severity | Impact | |-------------------------------|------|--------------------------------------------------|----------|-------------| | `src/prompt-builder.ts` | 118 | Comment uses word "placeholder" | Info | No impact -- comment describes the runtime fallback string `[${block.type}]` for unknown block types. The implementation is complete and intentional. | No stub implementations, empty handlers, or TODO markers found in Phase 2 source files. --- ### Human Verification Required None. All Phase 2 behaviors are verifiable programmatically: - Tool name and argument translation is pure data transformation (fully covered by unit tests) - Control protocol request/response is wire-format JSON (fully covered by unit tests) - Event streaming is synchronous mock-based (fully covered by unit tests) - TypeScript compilation is clean (tsc --noEmit produces no output) --- ### Commit Verification All 8 task commits from both SUMMARYs verified in git history: | Commit | Description | |-----------|----------------------------------------------------------| | `ad652a6` | test(02-01): add failing tests for tool name/arg mapping | | `d324b03` | feat(02-01): implement tool mapping module | | `fce2ac4` | test(02-01): add failing tests for control handler + type update | | `c11ff96` | feat(02-01): implement control protocol handler | | `66fe3c5` | test(02-02): add failing tests for tool_use content block streaming | | `5edc4ee` | feat(02-02): add tool_use content block handling to event bridge | | `8365e1e` | test(02-02): add failing tests for control_request routing and tool name mapping | | `80beb6a` | feat(02-02): wire control handler into provider, add reverse mapping to prompt builder | --- ### Test Suite Results - **Total tests:** 150 (all pass) - **Phase 2 additions:** 47 tests (Plan 01) + 16 tests (Plan 02) = 63 new tests - **Phase 1 regression:** All 87 Phase 1 tests continue to pass - **TypeScript:** `tsc --noEmit` exits clean (zero errors) --- ### Gaps Summary No gaps. All must-haves verified. The single key-link discrepancy (control-handler.ts not importing from tool-mapping.ts for MCP detection) is a PLAN documentation artifact -- the behavior it was meant to ensure ("MCP tools allowed") is implemented correctly via an equivalent direct prefix check. Goal achievement is not affected. --- *Verified: 2026-03-14T11:35:00Z* *Verifier: Claude (gsd-verifier)*