feat(mcp): MCP Server Core + Adapter Framework#35
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- Add JSON-RPC 2.0 protocol handler - Implement stdio transport for process communication - Create extensible adapter framework (ToolAdapter, ResourceAdapter) - Build adapter registry with lifecycle management - Implement MCPServer core class with MCP protocol support - Add mock adapter for testing - Support tools/list, tools/call, and initialize methods Package structure: - src/server/protocol: JSON-RPC and MCP types - src/server/transport: Stdio transport implementation - src/adapters: Base adapter classes and registry - src/utils: Logger utilities - tests/adapters: Mock adapter for testing Relates to #27
Implement the foundation of the MCP server with a robust, extensible adapter framework. This establishes the core protocol handler and plugin system for all future adapters. Implementation: - JSON-RPC 2.0 protocol handler with full spec compliance - Message routing and request/response handling - Structured error handling with proper error codes - Server lifecycle management (start, stop, health checks) - Stdio transport for process communication - Abstract Transport interface for future HTTP support - Base adapter interfaces (Adapter, ToolAdapter) - Adapter lifecycle hooks (initialize, shutdown, healthCheck) - Adapter Registry for management and execution routing - Message handler utilities and logger - Extracted pure functions following testability guidelines Features: ✅ JSON-RPC 2.0 protocol implementation ✅ Stdio transport with event-based communication ✅ Extensible adapter framework with plugin architecture ✅ Dynamic adapter registration/unregistration ✅ Structured error handling throughout ✅ Comprehensive README with architecture docs ✅ Kebab-case file naming for consistency Testing: - 80 tests, all passing - 67% statement coverage (utils at 94%+, integration at >60%) - Unit tests for JSON-RPC protocol (23 tests) - Unit tests for message handlers (25 tests) - Unit tests for adapter registry (23 tests) - Integration tests for full server stack (9 tests) - Mock adapter for testing framework Documentation: - Comprehensive README with examples - Architecture overview with diagrams - API reference for all public classes - Quick start guide with configuration examples Branch: feat/mcp-server-core Priority: High (blocks all other Epic #3 issues) Estimate: 3 days (actual: ~6 hours with AI assistance) Parent Epic: #26 (Epic: MCP Integration) Issue: #27
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Summary
Implements the foundational MCP server with a robust, extensible adapter framework. Establishes the core protocol handler and plugin system for all future adapters.
Features
✅ JSON-RPC 2.0 protocol implementation
✅ Stdio transport with event-based communication
✅ Extensible adapter framework with plugin architecture
✅ Dynamic adapter registration/unregistration
✅ Structured error handling throughout
✅ Comprehensive README with architecture docs
✅ Kebab-case file naming for consistency
Testing
Test Organization:
tests/server/jsonrpc.test.ts- Protocol teststests/server/utils/message-handlers.test.ts- Utility teststests/adapters/adapter-registry.test.ts- Registry teststests/integration/server.integration.test.ts- E2E teststests/adapters/mock-adapter.ts- Test helperCoverage by Component:
Architecture
Follows testability guidelines from
docs/TESTABILITY.md:utils/for direct testingDocumentation
File Organization
All files use kebab-case naming for readability:
adapter.ts,adapter-registry.ts,tool-adapter.tsmcp-server.ts,stdio-transport.ts,transport.tsmessage-handlers.tsand corresponding testsSuccess Metrics
Closes
Closes #27