Add comprehensive agent activity tracking
- Enhanced Agent struct with current_activity, current_files, and activity_history fields - Created ActivityTracker module to infer activities from tool calls - Integrated activity tracking into MCP server tool routing - Updated task board APIs to include activity information - Agents now show real-time status like 'Reading file.ex', 'Editing main.py', 'Sequential thinking', etc. - Added activity history to track recent agent actions - All file operations and tool calls are now tracked and displayed
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docs/MCP_COMPLIANCE_ENHANCEMENTS.md
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docs/MCP_COMPLIANCE_ENHANCEMENTS.md
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# MCP Compliance Enhancement Summary
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## Overview
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This document summarizes the enhanced Model Context Protocol (MCP) compliance features implemented in the Agent Coordinator system, focusing on session management, security, and real-time streaming capabilities.
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## Implemented Features
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### 1. 🔐 Enhanced Session Management
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#### Session Token Authentication
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- **Implementation**: Modified `register_agent` to return cryptographically secure session tokens
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- **Token Format**: 32-byte secure random tokens, Base64 encoded
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- **Expiry**: 60-minute session timeout with automatic cleanup
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- **Headers**: Support for `Mcp-Session-Id` header (MCP compliant) and `X-Session-Id` (legacy)
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#### Session Validation Flow
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```
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Client Server
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|-- POST /mcp/request ---->|
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| register_agent |
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|<-- session_token --------|
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| expires_at |
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|-- Subsequent requests -->|
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| Mcp-Session-Id: token |
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|<-- Authenticated resp ---|
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```
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#### Key Components
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- **SessionManager GenServer**: Manages token lifecycle and validation
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- **Secure token generation**: Uses `:crypto.strong_rand_bytes/1`
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- **Automatic cleanup**: Periodic removal of expired sessions
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- **Backward compatibility**: Supports legacy X-Session-Id headers
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### 2. 📋 MCP Protocol Version Compliance
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#### Protocol Headers
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- **MCP-Protocol-Version**: `2025-06-18` (current specification)
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- **Server**: `AgentCoordinator/1.0` identification
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- **Applied to**: All JSON responses via enhanced `send_json_response/3`
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#### CORS Enhancement
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- **Session Headers**: Added `mcp-session-id`, `mcp-protocol-version` to allowed headers
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- **Exposed Headers**: Protocol version and server headers exposed to clients
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- **Security**: Enhanced origin validation with localhost and HTTPS preference
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### 3. 🔒 Security Enhancements
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#### Origin Validation
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```elixir
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defp validate_origin(origin) do
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case URI.parse(origin) do
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%URI{host: host} when host in ["localhost", "127.0.0.1", "::1"] -> origin
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%URI{host: host} when is_binary(host) ->
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if String.starts_with?(origin, "https://") or
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String.contains?(host, ["localhost", "127.0.0.1", "dev", "local"]) do
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origin
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else
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Logger.warning("Potentially unsafe origin: #{origin}")
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"*"
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end
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_ -> "*"
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end
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end
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```
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#### Authenticated Method Protection
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Protected methods requiring valid session tokens:
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- `agents/register` ✓
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- `agents/unregister` ✓
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- `agents/heartbeat` ✓
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- `tasks/create` ✓
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- `tasks/complete` ✓
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- `codebase/register` ✓
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- `stream/subscribe` ✓
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### 4. 📡 Server-Sent Events (SSE) Support
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#### Real-time Streaming Endpoint
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- **Endpoint**: `GET /mcp/stream`
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- **Transport**: Streamable HTTP (MCP specification)
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- **Authentication**: Requires valid session token
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- **Content-Type**: `text/event-stream`
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#### SSE Event Format
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```
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event: connected
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data: {"session_id":"agent_123","protocol_version":"2025-06-18","timestamp":"2025-01-11T..."}
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event: heartbeat
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data: {"timestamp":"2025-01-11T...","session_id":"agent_123"}
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```
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#### Features
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- **Connection establishment**: Sends initial `connected` event
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- **Heartbeat**: Periodic keepalive events
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- **Session tracking**: Events include session context
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- **Graceful disconnection**: Handles client disconnects
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## Technical Implementation Details
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### File Structure
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```
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lib/agent_coordinator/
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├── session_manager.ex # Session token management
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├── mcp_server.ex # Enhanced register_agent
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├── http_interface.ex # HTTP/SSE endpoints + security
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└── application.ex # Supervision tree
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```
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### Session Manager API
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```elixir
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# Create new session
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{:ok, session_info} = SessionManager.create_session(agent_id, capabilities)
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# Validate existing session
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{:ok, session_info} = SessionManager.validate_session(token)
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{:error, :expired} = SessionManager.validate_session(old_token)
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# Manual cleanup (automatic via timer)
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SessionManager.cleanup_expired_sessions()
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```
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### HTTP Interface Enhancements
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```elixir
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# Session validation middleware
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case validate_session_for_method(method, conn, context) do
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{:ok, session_info} -> # Process request
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{:error, auth_error} -> # Return 401 Unauthorized
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end
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# MCP headers on all responses
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defp put_mcp_headers(conn) do
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conn
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|> put_resp_header("mcp-protocol-version", "2025-06-18")
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|> put_resp_header("server", "AgentCoordinator/1.0")
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end
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```
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## Usage Examples
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### 1. Agent Registration with Session Token
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```bash
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curl -X POST http://localhost:4000/mcp/request \
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-H "Content-Type: application/json" \
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-d '{
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"jsonrpc": "2.0",
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"id": "1",
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"method": "agents/register",
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"params": {
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"name": "My Agent Blue Koala",
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"capabilities": ["coding", "testing"],
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"codebase_id": "my_project"
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}
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}'
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# Response:
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{
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"jsonrpc": "2.0",
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"id": "1",
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"result": {
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"agent_id": "My Agent Blue Koala",
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"session_token": "abc123...",
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"expires_at": "2025-01-11T15:30:00Z"
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}
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}
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```
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### 2. Authenticated Tool Call
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```bash
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curl -X POST http://localhost:4000/mcp/request \
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-H "Content-Type: application/json" \
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-H "Mcp-Session-Id: abc123..." \
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-d '{
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"jsonrpc": "2.0",
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"id": "2",
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"method": "tools/call",
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"params": {
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"name": "get_task_board",
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"arguments": {"agent_id": "My Agent Blue Koala"}
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}
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}'
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```
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### 3. Server-Sent Events Stream
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```javascript
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const eventSource = new EventSource('/mcp/stream', {
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headers: {
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'Mcp-Session-Id': 'abc123...'
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}
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});
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eventSource.onmessage = function(event) {
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const data = JSON.parse(event.data);
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console.log('Received:', data);
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};
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```
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## Testing and Verification
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### Automated Test Script
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- **File**: `test_session_management.exs`
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- **Coverage**: Registration flow, session validation, protocol headers
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- **Usage**: `elixir test_session_management.exs`
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### Manual Testing
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1. Start server: `mix phx.server`
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2. Register agent via `/mcp/request`
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3. Use returned session token for authenticated calls
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4. Verify MCP headers in responses
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5. Test SSE stream endpoint
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## Benefits
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### 🔐 Security
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- **Token-based authentication**: Prevents unauthorized access
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- **Session expiry**: Limits exposure of compromised tokens
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- **Origin validation**: Mitigates CSRF and unauthorized origins
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- **Method-level protection**: Granular access control
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### 📋 MCP Compliance
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- **Official protocol version**: Headers indicate MCP 2025-06-18 support
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- **Streamable HTTP**: Real-time capabilities via SSE
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- **Proper error handling**: Standard JSON-RPC error responses
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- **Session context**: Request metadata for debugging
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### 🚀 Developer Experience
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- **Backward compatibility**: Legacy headers still supported
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- **Clear error messages**: Detailed authentication failure reasons
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- **Real-time updates**: Live agent status via SSE
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- **Easy testing**: Comprehensive test utilities
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## Future Enhancements
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### Planned Features
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- **PubSub integration**: Event-driven SSE updates
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- **Session persistence**: Redis/database backing
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- **Rate limiting**: Per-session request throttling
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- **Audit logging**: Session activity tracking
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- **WebSocket upgrade**: Bidirectional real-time communication
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### Configuration Options
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- **Session timeout**: Configurable expiry duration
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- **Security levels**: Strict/permissive origin validation
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- **Token rotation**: Automatic refresh mechanisms
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- **Multi-tenancy**: Workspace-scoped sessions
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---
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*This implementation provides a solid foundation for MCP-compliant session management while maintaining the flexibility to extend with additional features as requirements evolve.*
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