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- Replaced local image paths with CDN links for releases 1.3.11, 1.3.12, 1.4.0, 1.4.1, 1.5.0, and 1.5.2 in the changelog files. - Updated the changelog entries to ensure consistent image sourcing and improve loading performance.
84 lines
4.3 KiB
Plaintext
84 lines
4.3 KiB
Plaintext
---
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title: "Version 1.3.11"
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description: "Enhanced error handling, authorization features, and critical bug fixes"
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icon: "key"
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og:image: "https://mcp-use.com/api/og/release?v=1.3.11"
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---
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import { Contributors } from '/snippets/contributors.jsx'
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<Card img="https://mcp-use.com/api/og/release?v=1.3.11" title="Release 1.3.11" href="https://github.com/mcp-use/mcp-use/releases/tag/1.3.11">
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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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</Card>
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## New Features
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### Authorization System
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**[PR #149](https://github.com/pietrozullo/mcp-use/pull/149) by @pietrozullo**
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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.
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For detailed usage examples and configuration options, see the [Authentication documentation](/python/client/authentication).
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## Bug Fixes & Improvements
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### HTTP Connector Error Handling
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**[PR #279](https://github.com/pietrozullo/mcp-use/pull/279) by @renvins**
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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
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**[PR #273](https://github.com/pietrozullo/mcp-use/pull/273) by @renvins**
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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
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**[PR #270](https://github.com/pietrozullo/mcp-use/pull/270) by @Amrithesh-Kakkoth**
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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.
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```python
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# Before: This would fail validation
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{"enum": ["x", "y", "z"]}
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# After: Automatically fixed to
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{"type": "string", "enum": ["x", "y", "z"]}
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```
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### Documentation Fix
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**[PR #266](https://github.com/pietrozullo/mcp-use/pull/266) by @renvins**
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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
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**[PR #254](https://github.com/pietrozullo/mcp-use/pull/254) by @hetsaraiya**
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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.
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```python
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# New telemetry tracking includes:
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# - Execution success/failure status
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# - Number of steps taken
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# - Tools used during execution
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# - Response time and error details
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# - Agent configuration metadata
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```
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### Subprocess Cleanup
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**[PR #231](https://github.com/pietrozullo/mcp-use/pull/231) by @lorenss-m**
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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
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**[PRs #261](https://github.com/pietrozullo/mcp-use/pull/261), [#253](https://github.com/pietrozullo/mcp-use/pull/253), [#248](https://github.com/pietrozullo/mcp-use/pull/248) by @github-actions[bot]**
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Regular automated updates to dependent package information, ensuring the project stays current with its ecosystem and maintains compatibility with the latest versions of dependencies.
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## Contributors
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Thank you to all contributors who made this release possible:
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<Contributors users="pietrozullo,renvins,Amrithesh-Kakkoth,hetsaraiya,lorenss-m" />
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