feat(backend): implement MCP client infrastructure (#55) #69

cardosofelipe · 2026-01-03T10:13:07Z

cardosofelipe commented

2026-01-03 10:13:07 +00:00

Summary

Implements the complete MCP (Model Context Protocol) client infrastructure for Phase 2, enabling Syndarix to connect to and orchestrate multiple MCP servers for AI agent tool execution.

Key Components

MCPClientManager: Main facade for all MCP operations with singleton pattern
MCPServerRegistry: Thread-safe singleton for managing server configurations
ConnectionPool: Connection pooling with automatic reconnection and exponential backoff
ToolRouter: Automatic tool routing with custom AsyncCircuitBreaker for resilience
Configuration: YAML-based config with Pydantic models and env var expansion

API Endpoints

Endpoint	Description
`GET /mcp/servers`	List all MCP servers
`GET /mcp/servers/{name}/tools`	List server tools
`GET /mcp/tools`	List all tools from all servers
`GET /mcp/health`	Health check all servers
`POST /mcp/call`	Execute tool (admin only)
`GET /mcp/circuit-breakers`	Circuit breaker status
`POST /mcp/circuit-breakers/{name}/reset`	Reset circuit breaker
`POST /mcp/servers/{name}/reconnect`	Force reconnection

Testing

156 unit tests with comprehensive coverage
All tests passing
Covers services, routes, error handling, edge cases

Documentation

backend/docs/MCP_CLIENT.md with usage examples
Phase 2+ workflow documentation added to WORKFLOW.md

Code Quality

Linting passes (ruff)
Type checking passes (mypy)
Multi-agent code review completed and all issues addressed:
- Fixed race conditions in singleton pattern
- Added thread-safe circuit breaker reset
- Added server name input validation
- Used public methods instead of private attribute access

Test plan

All 156 MCP unit tests pass
Type checking (mypy) passes
Linting (ruff) passes
Multi-agent code review completed
Manual testing with real MCP servers (deferred to integration phase)

Closes #55

## Summary Implements the complete MCP (Model Context Protocol) client infrastructure for Phase 2, enabling Syndarix to connect to and orchestrate multiple MCP servers for AI agent tool execution. ### Key Components - **MCPClientManager**: Main facade for all MCP operations with singleton pattern - **MCPServerRegistry**: Thread-safe singleton for managing server configurations - **ConnectionPool**: Connection pooling with automatic reconnection and exponential backoff - **ToolRouter**: Automatic tool routing with custom AsyncCircuitBreaker for resilience - **Configuration**: YAML-based config with Pydantic models and env var expansion ### API Endpoints | Endpoint | Description | |----------|-------------| | `GET /mcp/servers` | List all MCP servers | | `GET /mcp/servers/{name}/tools` | List server tools | | `GET /mcp/tools` | List all tools from all servers | | `GET /mcp/health` | Health check all servers | | `POST /mcp/call` | Execute tool (admin only) | | `GET /mcp/circuit-breakers` | Circuit breaker status | | `POST /mcp/circuit-breakers/{name}/reset` | Reset circuit breaker | | `POST /mcp/servers/{name}/reconnect` | Force reconnection | ### Testing - 156 unit tests with comprehensive coverage - All tests passing - Covers services, routes, error handling, edge cases ### Documentation - `backend/docs/MCP_CLIENT.md` with usage examples - Phase 2+ workflow documentation added to `WORKFLOW.md` ### Code Quality - Linting passes (ruff) - Type checking passes (mypy) - Multi-agent code review completed and all issues addressed: - Fixed race conditions in singleton pattern - Added thread-safe circuit breaker reset - Added server name input validation - Used public methods instead of private attribute access ## Test plan - [x] All 156 MCP unit tests pass - [x] Type checking (mypy) passes - [x] Linting (ruff) passes - [x] Multi-agent code review completed - [ ] Manual testing with real MCP servers (deferred to integration phase) ## Closes #55

cardosofelipe added 1 commit 2026-01-03 10:13:07 +00:00

feat(backend): implement MCP client infrastructure (#55 ) e5975fa5d0

Core MCP client implementation with comprehensive tooling:

**Services:**
- MCPClientManager: Main facade for all MCP operations
- MCPServerRegistry: Thread-safe singleton for server configs
- ConnectionPool: Connection pooling with auto-reconnection
- ToolRouter: Automatic tool routing with circuit breaker
- AsyncCircuitBreaker: Custom async-compatible circuit breaker

**Configuration:**
- YAML-based config with Pydantic models
- Environment variable expansion support
- Transport types: HTTP, SSE, STDIO

**API Endpoints:**
- GET /mcp/servers - List all MCP servers
- GET /mcp/servers/{name}/tools - List server tools
- GET /mcp/tools - List all tools from all servers
- GET /mcp/health - Health check all servers
- POST /mcp/call - Execute tool (admin only)
- GET /mcp/circuit-breakers - Circuit breaker status
- POST /mcp/circuit-breakers/{name}/reset - Reset circuit breaker
- POST /mcp/servers/{name}/reconnect - Force reconnection

**Testing:**
- 156 unit tests with comprehensive coverage
- Tests for all services, routes, and error handling
- Proper mocking and async test support

**Documentation:**
- MCP_CLIENT.md with usage examples
- Phase 2+ workflow documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>