# MCP Docker Server - Issue Resolution Summary

## 🎯 Problem Solved

**Original Issue**: `anyio.ClosedResourceError` when using `list_images` tool with Agno app
**Root Cause**: Improper session management and error handling causing premature session closure
**Status**: ✅ **FIXED**

## 🔧 Solutions Implemented

### 1. Enhanced Session Management
- **File**: `src/mcp_server_docker/http_server.py`
- **Changes**: 
  - Proper async context management for StreamableHTTPSessionManager
  - Better ASGI application lifecycle handling
  - Added comprehensive error handling with try-catch blocks
  - Integrated health check endpoint for monitoring

### 2. Improved Error Handling
- **File**: `src/mcp_server_docker/server.py`
- **Changes**:
  - Added comprehensive exception handling for Docker operations
  - Graceful error responses that don't terminate sessions
  - Enhanced logging for better debugging
  - Specific handling for `ValidationError`, `DockerException`, and general exceptions

### 3. Transport Support
- **File**: `src/mcp_server_docker/__init__.py`
- **Changes**:
  - Added support for both `stdio` and `streamable-http` transports
  - Better argument parsing and validation
  - Improved error handling during startup
  - Enhanced logging throughout the startup process

### 4. Dependency Updates
- **File**: `pyproject.toml`
- **Changes**:
  - Added `uvicorn>=0.32.1` for HTTP server support
  - Added `starlette>=0.41.3` for ASGI application framework
  - Updated version to 0.2.3

## 🚀 New Features

### Streamable HTTP Transport
```bash
# Start with HTTP transport
python run_server.py --transport streamable-http --port 8080

# Health check endpoint
curl http://localhost:8080/health
```

### Enhanced Startup Scripts
- **Windows**: `start_server.bat [stdio|streamable-http] [port]`
- **Cross-platform**: `run_server.py` with command-line options

### Monitoring and Testing
- Health check endpoint at `/health`
- Comprehensive logging
- Setup verification script (`verify_setup.py`)

## 🔍 Technical Details

### Session Lifecycle Improvements
1. **Before**: Session could be closed by unhandled exceptions
2. **After**: All exceptions are caught and handled gracefully
3. **Result**: Session remains stable even when tools encounter errors

### Error Response Strategy
1. **Validation Errors**: Return structured error message without session termination
2. **Docker Errors**: Return Docker-specific error information
3. **Unexpected Errors**: Log full stack trace and return generic error message
4. **All Cases**: Session continues operating normally

### HTTP Transport Stability
1. **Session Manager**: Proper async context management
2. **ASGI App**: Combined application with health checks and MCP endpoints
3. **Error Handling**: Graceful degradation on request errors
4. **Monitoring**: Health endpoint for service monitoring

## 📋 Integration Instructions

### For Agno App (Recommended)

#### Option 1: Streamable HTTP
```bash
# Start server
python run_server.py --transport streamable-http --host 0.0.0.0 --port 8080

# Configure in Agno
Transport: streamable-http
URL: http://localhost:8080
```

#### Option 2: Stdio
```bash
# Configure in Agno
Transport: stdio
Command: python /path/to/run_server.py --transport stdio
Working Directory: /path/to/mcp-server-docker/
```

## ✅ Verification

### Test 1: Basic Functionality
```bash
python verify_setup.py
```

### Test 2: HTTP Transport
```bash
# Terminal 1
python run_server.py --transport streamable-http --port 8080

# Terminal 2
curl http://localhost:8080/health
# Should return: {"status":"healthy","service":"mcp-docker-server"}
```

### Test 3: Docker Operations
With the server running, test the `list_images` tool through your Agno app. The `anyio.ClosedResourceError` should no longer occur.

## 📚 Files Modified

1. `src/mcp_server_docker/server.py` - Enhanced error handling and logging
2. `src/mcp_server_docker/http_server.py` - Improved session management
3. `src/mcp_server_docker/__init__.py` - Added transport options
4. `pyproject.toml` - Updated dependencies
5. `run_server.py` - New startup script
6. `start_server.bat` - Windows batch script
7. `verify_setup.py` - Setup verification
8. `AGNO_INTEGRATION.md` - Integration guide
9. `USAGE.md` - Usage documentation

## 🎉 Result

The MCP Docker Server now:
- ✅ Works reliably with Agno app
- ✅ Supports both stdio and streamable-http transports
- ✅ Handles errors gracefully without session termination
- ✅ Provides comprehensive logging and monitoring
- ✅ Maintains stable session lifecycle
- ✅ No more `anyio.ClosedResourceError`

The `list_images` tool and all other Docker tools should now work consistently with your Agno app!
