llm-cli-gateway: Cursor rule for Cursor

You are working on the llm-cli-gateway MCP server.

CRITICAL: Before making ANY changes to this codebase:

1. Read docs/guides/BEST_PRACTICES.md
2. Follow ALL conventions outlined in docs/guides/BEST_PRACTICES.md

Key Rules:

• Tool names MUST use snake_case (e.g., claude_request, not claudeRequest)
• Error messages MUST be actionable, not just "not found"
• Logging MUST go to stderr, never stdout (MCP protocol uses stdout)
• All exported functions MUST have TypeScript return types
• Session state MUST be minimal - only IDs and metadata
• Circuit breaker state MUST be respected in retry logic
• Tests MUST be added for any new functionality
• DRY principle - no duplicate constants or logic

When adding new tools:

1. Use Zod for input validation
2. Provide clear descriptions (20+ chars with action words)
3. Return structured error responses via createErrorResponse()
4. Add unit AND integration tests
5. Update docs/guides/BEST_PRACTICES.md if introducing new patterns

When adding retry/resilience logic:

1. Always add jitter to exponential backoff
2. Ensure operations are idempotent
3. Use appropriate circuit breaker
4. Log retry attempts with context

Test Requirements:

• Enforced coverage: 70% lines, functions, and statements; 60% branches
• Both unit tests (isolation) and integration tests (real calls)
• Follow AAA pattern (Arrange, Act, Assert)

Self-Check Before Finalizing Changes: □ All tool names use snake_case □ Error messages are actionable and context-aware □ No console.log (use logger.info/error/debug) □ All exported functions have return type annotations □ Tests added for new functionality □ TypeScript compiles: npm run build □ All tests pass: npm test □ No duplicate code or constants