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MCP Server Implementation Complete - v0.1.2

Summary

Successfully implemented and tested the Yoto Smart Stream MCP (Model Context Protocol) server with comprehensive fixes, features, and documentation updates.

Changes Made

1. Core Fixes

Commit: Fix MCP server: correct syntax error and update mcp.json to use local package

  • Fixed .vscode/mcp.json to use --from flag with absolute path
  • Fixed syntax error in server.py (missing closing parenthesis)
  • Properly configured to use local mcp-server package instead of PyPI

Commit: Fix MCP server: use direct Python execution instead of uvx entry point

  • Changed MCP execution from uvx to direct Python for better reliability
  • Simplified configuration and eliminated entry point resolution issues

Commit: Fix MCP server entry point: use sync_main wrapper for asyncio.run()

  • Created sync_main() wrapper function for proper async entry point handling
  • Updated pyproject.toml entry point to use server:sync_main

2. Feature Implementation

Commit: MCP: Make YOTO_SERVICE_URL optional at startup - lazy initialization

  • YOTO_SERVICE_URL no longer required to start the server
  • Implements lazy initialization pattern
  • Per-tool deployment support via service_url parameter
  • Authentication happens only on first tool call
  • Per-host auth cookie caching in memory

3. Testing & Validation

Commit: Add comprehensive MCP server testing suite

  • test_mcp_structure.py: Validates server structure, tools, and configuration (8/8 tests pass)
  • test_api_integration.py: Tests against production API (4/4 tests pass)
  • All tests verify correct tool exposure and API compatibility

4. Version Management

Commits: MCP: Bump version & Release MCP server version 0.1.2

  • Version bumped from 0.1.1 to 0.1.2 (patch release)
  • Includes build identifier testing phase (+build.1)
  • Final stable release version 0.1.2

5. Documentation

Commit: Update skills documentation for MCP server v0.1.2

  • Removed duplicate MCP sections from skills documentation
  • Updated version and feature documentation
  • Added lazy initialization feature documentation
  • Documented multi-deployment query capabilities
  • Added per-host auth caching details
  • Clarified environment variable requirements
  • Added testing instructions
  • Removed outdated uvx configuration examples

Technical Details

Architecture

MCP Server
├── Entry Point: server.py (direct Python execution)
├── Lazy Initialization: YOTO_SERVICE_URL optional at startup
├── Per-Tool Deployments: service_url parameter in each tool call
├── Auth Caching: Per-host cookie caching in memory (AUTH_CACHE dict)
└── Tools:
    ├── oauth(service_url, action): Manage Yoto authentication
    └── query_library(service_url, query): Natural language library queries

Configuration

Current .vscode/mcp.json:

{
  "servers": {
    "yoto-library": {
      "command": "python",
      "args": ["/path/to/yoto-smart-stream/mcp-server/server.py"],
      "env": {
        "ADMIN_USERNAME": "admin",
        "ADMIN_PASSWORD": "yoto",
        "YOTO_USERNAME": "email@example.com",
        "YOTO_PASSWORD": "${input:yotoPassword}"
      }
    }
  }
}

Environment Variables

  • ADMIN_USERNAME (required): Admin account for server API authentication
  • ADMIN_PASSWORD (required): Admin account password
  • YOTO_USERNAME (optional): Yoto account email for OAuth activation
  • YOTO_PASSWORD (optional): Yoto account password for OAuth activation
  • YOTO_SERVICE_URL (optional): Default service URL (can be overridden per tool call)

Test Results

Structure Tests (8/8 Pass ✅)

  • MCP Server object exists
  • list_tools handler exists
  • call_tool handler exists
  • Tool definitions in source code (oauth, query_library)
  • Authentication caching (AUTH_CACHE)
  • Tool argument schemas with service_url
  • Lazy YOTO_SERVICE_URL initialization
  • Entry point configuration (sync_main)

API Integration Tests (4/4 Pass ✅)

  • API health check
  • API authentication
  • Library data retrieval (243 cards in production)
  • OAuth endpoints available

Multi-Deployment Support

The MCP server now supports querying different deployments:

# Query production
query_library(
  service_url="https://yoto-smart-stream-production.up.railway.app",
  query="how many cards?"
)

# Query staging
query_library(
  service_url="https://yoto-smart-stream-staging.up.railway.app",
  query="how many cards?"
)

# Compare results

Commits on develop branch (not pushed)

  1. 0c0e775 - Fix MCP server: correct syntax error and update mcp.json
  2. 1305e3d - Fix MCP server: use direct Python execution
  3. 2ea91b1 - Fix MCP server entry point: use sync_main wrapper
  4. c87e393 - MCP: Make YOTO_SERVICE_URL optional
  5. 269c0ee - Add comprehensive MCP server testing suite
  6. 54ca168 - MCP: Bump version to 0.1.2+build.1
  7. 6aa7360 - Release MCP server version 0.1.2
  8. ba5c605 - Update skills documentation

Status: Ready for Deployment

✅ All tests passing ✅ Stable version released (0.1.2) ✅ Documentation updated and pruned ✅ No push required (awaiting approval)

Next Steps

  1. Review commits on develop branch
  2. When ready, push to main to trigger Railway deployment
  3. Test deployed MCP server in VS Code/Claude Desktop