Brummer MCP Server

# Hub Implementation Analysis - Gaps Between Requirements and Implementation ## 1. Hub Tools Implementation (hub_tools.go) ### ✅ Implemented: - All standard tools are properly proxied with `hub_` prefix - Error handling is consistent using `mcplib.NewToolResultError` - Tools correctly pass through instance_id parameter - Script tools: hub_scripts_list, hub_scripts_run, hub_scripts_stop, hub_scripts_status - Log tools: hub_logs_stream, hub_logs_search - Proxy/telemetry tools: hub_proxy_requests, hub_telemetry_sessions, hub_telemetry_events - Browser tools: hub_browser_open, hub_browser_refresh, hub_browser_navigate, hub_browser_screenshot - REPL tool: hub_repl_execute ### ❌ Missing: - **Streaming support**: The hub tools don't handle streaming responses. They all return the raw JSON result from `CallTool`, but streaming tools like `hub_logs_stream` and `hub_telemetry_events` should support real-time streaming - **Resource proxying**: No hub resources are implemented (e.g., hub_logs_recent, hub_telemetry_sessions) - **Prompt proxying**: No hub prompts are implemented ## 2. Connection State Management (connection_manager.go) ### ✅ Implemented: - ConnectionInfo struct has all required fields: - State tracking (discovered/connecting/active/retrying/dead) - Timing fields: DiscoveredAt, StateChangedAt, ConnectedAt - StateHistory with transitions and reasons - LastActivity tracking - RetryCount - State transition recording with reasons - Proper state management through channels - Activity updates via UpdateActivity method ### ❌ Missing: - **Connection timing statistics**: While timing data is tracked, it's not calculated/exposed in a useful way - **State duration tracking**: No aggregated statistics on how long instances spend in each state ## 3. Instance Discovery ### ✅ Implemented: - File watching via fsnotify in discovery package - Initial scan on startup - Real-time updates when instance files are created/modified/removed - Cleanup of stale instances via CleanupStaleInstances ### ❌ Missing: - **Process validation**: The discovery system doesn't validate if the process is actually running - **Port validation**: No checking if the port is actually listening ## 4. Health Monitoring (health_monitor.go) ### ✅ Implemented: - Periodic health checks using MCP ping - Activity updates on successful pings - Failure tracking with consecutive failure count - State transitions based on health (healthy -> unhealthy -> dead) - Callbacks for state changes - Response time tracking ### ❌ Missing: - **Integration with ConnectionManager state**: Health monitor updates activity but doesn't directly update connection state - **Recovery from dead state**: Once marked dead, there's no automatic recovery mechanism ## 5. instances_list Tool ### ✅ Implemented (in cmd/brum/main.go): - Returns all required fields: - id, name, directory, port, process_pid - state (as string) - connected (boolean) - discovered_at, state_changed_at - time_in_state, total_time - retry_count - state_stats with transitions ### ❌ Missing: - **Response time statistics**: While tracked by health monitor, not included in instances_list - **Last activity timestamp**: Tracked but not exposed - **Connected sessions count**: Available but not included ## 6. Hub Mode Integration ### ✅ Implemented: - Hub mode flag (--mcp) properly switches to hub functionality - Stdio-based MCP server for hub mode - Connection manager, health monitor, and discovery system integration - Dynamic tool registration from instances - Session management ### ❌ Missing: - **Hub mode is not integrated into StreamableServer**: The hub uses the older server.MCPServer instead of the new StreamableServer - **No HTTP endpoint for hub**: Hub only works via stdio, not HTTP - **Missing hub resources and prompts**: Only tools are implemented ## 7. Overall Architecture Gaps ### Major Issues: 1. **Two separate MCP server implementations**: Hub uses `server.MCPServer` while normal mode uses `StreamableServer` 2. **No streaming support in hub mode**: Hub tools can't stream responses 3. **Incomplete protocol support**: Hub only implements tools, not resources or prompts 4. **State synchronization**: Health monitor and connection manager don't fully coordinate state changes 5. **Error recovery**: Limited retry logic and no automatic recovery from dead state ### Recommendations: 1. Merge hub functionality into StreamableServer for consistency 2. Implement streaming support for hub tools 3. Add hub resources and prompts 4. Improve state coordination between health monitor and connection manager 5. Add automatic recovery mechanisms for dead instances 6. Include more statistics in instances_list response