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Release1.3.11

Release 1.3.11

This release brings significant improvements to MCP-Use with enhanced error handling, new authorization capabilities, and several critical bug fixes. The most notable additions include a comprehensive authorization system and improved reliability across HTTP connectors and subprocess management.

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New Features

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Authorization System

PR #149 by @pietrozullo A comprehensive OAuth2 and Bearer token authentication framework has been added to MCP-Use, enabling secure access control for MCP servers and clients. The system includes automatic OAuth discovery, dynamic client registration, and secure token storage. Key features include file-based token storage, automatic token refresh, OAuth metadata discovery, and secure callback handling for the authorization code flow. For detailed usage examples and configuration options, see the Authentication documentation.

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Bug Fixes & Improvements

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HTTP Connector Error Handling

PR #279 by @renvins Significantly improved error handling in HTTP connectors with better authentication error detection and graceful fallback between transport methods. The system now properly handles HTTP 401/403/407 errors and provides clearer diagnostic messages when authentication fails.

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Empty Tool Result Handling

PR #273 by @renvins Fixed a critical issue where empty tool results (content: []) were causing validation errors in the LangChain adapter. The system now correctly processes empty results and handles cases where tools legitimately return no content.

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JSON Schema Enum Validation

PR #270 by @Amrithesh-Kakkoth Resolved a validation issue in jsonschema_to_pydantic conversion where enum fields without explicit type declarations were failing validation. The fix automatically adds "type": "string" to enum fields, ensuring proper Pydantic model generation. 
# Before: This would fail validation
{"enum": ["x", "y", "z"]}

# After: Automatically fixed to
{"type": "string", "enum": ["x", "y", "z"]}

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Documentation Fix

PR #266 by @renvins Corrected a typo in the README documentation where astream was incorrectly referenced instead of stream, improving clarity for developers following the streaming examples.

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MCPAgent Execution Tracking

PR #254 by @hetsaraiya Enhanced the MCPAgent execution flow with comprehensive success/failure tracking and telemetry collection. The system now properly tracks execution status, steps taken, tools used, and execution time for better observability and debugging. 
# New telemetry tracking includes:
# - Execution success/failure status
# - Number of steps taken
# - Tools used during execution
# - Response time and error details
# - Agent configuration metadata

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Subprocess Cleanup

PR #231 by @lorenss-m Fixed a critical resource leak in subprocess management when running multiple MCP clients concurrently. The fix ensures proper process termination and cleanup, preventing zombie processes and memory leaks in long-running applications.

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Maintenance

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Automated Dependency Updates

PRs #261, #253, #248 by @github-actions[bot] Regular automated updates to dependent package information, ensuring the project stays current with its ecosystem and maintains compatibility with the latest versions of dependencies.