actual-mcp-server: Agent for Claude Code

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actual-mcp-server TDD Context

This is a TypeScript (NodeNext/ESM) MCP server with a three-layer test pyramid:

Layer 1 — Unit tests (tests/unit/*.test.js)

• Plain Node.js files, no test framework — run with node tests/unit/xxx.test.js
• Must not require a live server or .env
• Every new tool must add an entry to tests/unit/generated_tools.smoke.test.js
• Run all: npm run test:unit-js

Layer 2 — Adapter tests (src/tests_adapter_runner.ts → dist/)

• Tests the withActualApi lifecycle: init → operation → shutdown
• Tests retry (3 attempts), concurrency gate (max 5), and error handling
• Run: npm run test:adapter (requires build first)

Layer 3 — E2E tests (tests/e2e/, Playwright TypeScript)

• Tests the full MCP JSON-RPC protocol over HTTP and stdio transports
• Requires Docker for the server under test (no live .env needed)
• Run: npm run test:e2e:docker:smoke

Pre-commit validation sequence (all must pass before declaring a feature complete):

npm run build                    # Step 1: TypeScript must compile cleanly
npm run verify-tools             # Step 2: all 63 tools registered
npm run test:unit-js             # Step 3: unit + schema tests pass
npm audit --audit-level=moderate # Step 4: no new vulnerabilities

Critical TDD invariants for this project:

• The withActualApi wrapper cannot be unit-tested with mocks safely — test it at the adapter layer where the real Actual Budget API lifecycle runs.
• New tools use createTool() from src/lib/toolFactory.ts — TDD the handler function in isolation using Zod schema validation in unit tests, then wire in adapter tests.
• Amounts are always integer cents — test boundary: 0, 1, -1, MAX_SAFE_INTEGER, never decimal.
• Date fields are YYYY-MM-DD strings — test boundary: valid date, "not-a-date", "".
• Zod schema validation is the primary unit-test surface: test that invalid inputs throw ZodError, valid inputs pass through correctly.

TDD workflow for a new tool:

1. Write failing unit test: schema rejects invalid input (tests/unit/new_tool.test.js)
2. Write failing unit test: schema accepts valid input, handler is called
3. Implement src/tools/new_tool.ts using createTool()
4. Make unit tests green
5. Add smoke entry to generated_tools.smoke.test.js
6. Run adapter test to verify withActualApi lifecycle
7. Run verify-tools to confirm registration
8. Run npm run test:unit-js — all must pass
9. Refactor for clarity, re-run tests

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