changelog.txt

# Changelog

All notable changes to this project will be documented in this file.

## [1.4.0] - 2025-01-19

### Added
- **Advanced Token Counting System**: Complete token tracking and management system
  - Precise token counting for OpenAI, Anthropic, and other providers
  - Hybrid counting with API validation and tiktoken fallback
  - Tool output token tracking and management
  - Memory cleanup and optimization based on token limits
  - Dynamic truncation of tool responses to stay within limits
  - Comprehensive token usage statistics and reporting

- **Enhanced MCP Client Features**:
  - Improved error handling and connection stability
  - Better resource management and cleanup
  - Enhanced logging and debugging capabilities
  - Support for dynamic server selection

- **New Connector Implementations**:
  - Enhanced HTTP connector with better error handling
  - Improved stdio connector with process management
  - Advanced sandbox connector for E2B integration
  - WebSocket connector improvements

- **Comprehensive Test Suite**:
  - Unit tests for all core components
  - Integration tests for real MCP server interactions
  - Token counting system tests
  - Performance and stress tests
  - Test servers for controlled testing environments

- **Documentation and Examples**:
  - Complete API documentation
  - Comprehensive examples for different use cases
  - Security guidelines and best practices
  - Development and contribution guides
  - Elicitation functionality documentation

### Enhanced
- **MCPAgent Improvements**:
  - Better conversation memory management
  - Improved tool integration and error handling
  - Enhanced streaming response support
  - Better token management integration

- **Configuration System**:
  - More flexible server configuration options
  - Environment variable support for all settings
  - Validation and error checking for configurations
  - Support for multiple configuration formats

- **Security and Safety**:
  - Removed hardcoded secrets and tokens
  - Environment variable-based API key management
  - Improved sandboxing and isolation
  - Better error handling to prevent information leaks

### Fixed
- Connection stability issues with MCP servers
- Memory leaks in long-running sessions
- Token counting accuracy across different providers
- Resource cleanup on connection failures
- Race conditions in async operations

### Dependencies
- Updated LangChain integration for latest versions
- Enhanced tiktoken integration for accurate counting
- Improved asyncio handling for better performance
- Added comprehensive logging with structured output

### Development
- Enhanced development environment setup
- Improved testing infrastructure
- Better code organization and modularity
- Comprehensive linting and formatting rules
- Type hints throughout the codebase

### Breaking Changes
- None - this release maintains backward compatibility

### Migration Guide
- No migration required for existing users
- New token counting features are opt-in
- Configuration format remains compatible

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## Previous Releases

### [1.3.6] - Previous Release
- Basic MCP client functionality
- LangChain integration
- Core connector implementations
- Basic agent framework

### Features in This Release
This release represents a major enhancement to the MCP-Use library with:

1. **Production-Ready Token Management**: Complete system for tracking, limiting, and optimizing token usage across all supported LLM providers.

2. **Enhanced Reliability**: Improved error handling, connection management, and resource cleanup for production deployments.

3. **Comprehensive Testing**: Full test suite covering unit, integration, and performance testing scenarios.

4. **Developer Experience**: Better documentation, examples, and development tools for easier adoption and contribution.

5. **Security First**: Removed all hardcoded secrets, improved sandboxing, and implemented security best practices throughout.

### Compatibility
- Python 3.11+ required
- Compatible with LangChain 0.1.0+
- Supports all major LLM providers (OpenAI, Anthropic, Google, etc.)
- Works with MCP Protocol v1.0+

### Known Issues
- None at release time

### Contributors
- Enhanced by Claude AI with comprehensive improvements
- Community feedback incorporated
- Security review completed