# AGENT_HANDOFF.md

## Completed

### Phase 0 — Repository Setup
- Repository skeleton (TASK 0.1)
- package.json with dependencies (TASK 0.2)

### Phase 1 — Core Utilities
- Configuration loader (`src/config/env.js`) — TASK 1.1
- Secret redaction utility (`src/utils/redact.js`) — TASK 1.2
- Context budget utility (`src/utils/context-budget.js`) — TASK 1.3
- Safe logging helper (`src/utils/logging.js`) — TASK 1.4

### Phase 2 — OpenAI Integration
- OpenAI client wrapper (`src/openai/client.js`) — TASK 2.1
- Response builder (`src/openai/responses.js`) — TASK 2.2
- Error handling and edge cases (tests) — TASK 2.3

### Phase 3 — Tool Inputs and Prompts
- Zod input validation schemas (`src/tools/schemas.js`, tests) — TASK 3.1
- Base prompt template (`src/prompts/base.js`, tests) — TASK 3.2
- ask_chatgpt prompt builder (`src/prompts/ask-chatgpt.js`, tests) — TASK 3.3
- review_plan prompt builder (`src/prompts/review-plan.js`, tests) — TASK 3.4
- review_code prompt builder (`src/prompts/review-code.js`, tests) — TASK 3.5
- debug_issue prompt builder (`src/prompts/debug-issue.js`, tests) — TASK 3.6
- architecture_review prompt builder (`src/prompts/architecture-review.js`, tests) — TASK 3.7

## Next Phase

### Phase 4 - Tool Handlers

Build the MCP tool handlers that:
1. Register each tool with the MCP server.
2. Validate input using `schemas.js`.
3. Call the appropriate prompt builder.
4. Send the prompt to OpenAI via `responses.js`.
5. Return structured advisory output to Claude Code.

## Completed (Phase 4)

All five MCP tool handlers are complete:

| Handler | File | Tests |
|---------|------|-------|
| handleAskChatGpt | `src/tools/ask-chatgpt.js` | ✅ 27 |
| handleReviewPlan | `src/tools/review-plan.js` | ✅ 28 |
| handleReviewCode | `src/tools/review-code.js` | ✅ 28 |
| handleDebugIssue | `src/tools/debug-issue.js` | ✅ 28 |
| handleArchitectureReview | `src/tools/architecture-review.js` | ✅ 28 |

Total: 139 orchestration-only tests, all passing.

## Completed (Phase 5)

**All five MCP tools registered:** ask_chatgpt, review_plan, review_code, debug_issue, architecture_review.

### Task 5.1 - MCP server skeleton ✅

Minimal MCP stdio server in `src/server.js`. MCP initialize handshake succeeds. No tools registered yet.

### Task 5.2 - Register ask_chatgpt MCP tool ✅

`ask_chatgpt` is now registered as an MCP tool on the server (`src/server.js`).

**Registration details:**
- Uses shared `baseInputSchema` (question required + context, constraints, expectedOutput, projectSummary, taskSummary, relevantFiles, logs optional).
- All 3 external deps injected: `loadConfig`, `createOpenAIClient`, `sendOpenAIResponse`.
- Returns structured MCP tool result: `{ content: [{ type: "text", text }], isError, warnings }`.

**Smoke test results (all passing):**
- initialize → server returns `chatgpt-mcp` v0.1.0 ✅
- tools/list → exposes `ask_chatgpt` with correct schema ✅
- tools/call (happy path, mocked OpenAI) → `{ content: [...], isError: false }` with answer ✅
- tools/call (minimal input `{ question: "hi" }`) → works ✅
- tools/call (full input, all 10 schema fields) → handled correctly ✅
- tools/call (missing OPENAI_API_KEY) → structured MCP error `"Error: Configuration error: OPENAI_API_KEY is missing."` ✅
- tools/call (invalid API key) → structured MCP error `"OpenAI API error (OpenAIAuthError): 401"` ✅
- All 523 unit tests pass across 18 test files ✅

**Production code (`src/server.js`):** ~39 lines, single `ask_chatgpt` tool registered with MCP via Stdio transport.

### Task 5.3 - Register remaining MCP tools ✅

Four additional MCP tools registered on the server (`src/server.js`):

| Tool | Handler |
|------|---------|
| `review_plan` | handleReviewPlan |
| `review_code` | handleReviewCode |
| `debug_issue` | handleDebugIssue |
| `architecture_review` | handleArchitectureReview |

**All five MCP tools now registered:** ask_chatgpt, review_plan, review_code, debug_issue, architecture_review.

**Smoke test results (all passing):**
- initialize → server returns `chatgpt-mcp` v0.1.0 ✅
- tools/list → 5 tools total ✅
- tools/call reaches handlers for all 5 tools ✅
- missing OPENAI_API_KEY → structured tool errors: `"Error: Configuration error: OPENAI_API_KEY is missing."` ✅
- npm test → 523 tests pass across 18 test files, no regressions ✅

**Implementation notes:**
- Each tool registered explicitly with its own `registerTool()` call — no registry abstraction.
- All handlers use existing modules only (no new imports or files).
- SDK quirk: `isError: true` wraps results in JSON-RPC error envelope (`code: -32603`).

## Next Pending

### Task 5.4 - Normalize MCP tool error formatting

## General Rules

- Read ARCHITECTURE.md before making changes.
- Work incrementally.
- Keep changes small.
- Do not implement multiple phases at once.
- Do not add features not described in ARCHITECTURE.md.
- Update documentation when appropriate.
- Claude Code is the implementation agent.
- ChatGPT MCP is advisory only.