fastmcp Releases

This release reverts recent UI modifications by restoring the previous model-selection interface and removing the expandable sections and ClinePass models.

Jun 17, 2026

This update introduces significant enhancements including ClinePass support and MCP server capabilities, alongside performance improvements and various bug fixes.

Jun 17, 2026

This release marks a substantial update focusing on web API expansion, URL handling improvements via rust-url, and stability fixes, alongside various performance optimizations.

Jun 16, 2026

This release introduces a new CORS configuration option for the HTTP stream, allowing users to customize cross-origin resource sharing settings.

Jun 15, 2026

This release enhances the OAuthProxy authentication mechanism by allowing the inclusion of extra authorization parameters.

Jun 14, 2026

Feature release adding support for structured tool output, enabling tools to return data in a more organized and machine-readable format.

Jun 10, 2026

Improves stability and responsiveness of the TUI by implementing instant quit mechanisms and handling sandbox container races. Additionally cleans up terminal output by stripping ANSI escapes and images from rejected vision sessions.

Jun 9, 2026

This release significantly expands Chrome DevTools capabilities by adding experimental TOON support, new memory debugging tools, and heap snapshot management. It also improves performance through concurrent Lighthouse file saving and refactors internal logging and validation processes.

Jun 8, 2026

Bug fix release addressing critical OAuth security vulnerabilities in the OAuthProxy implementation.

Jun 6, 2026

A bug fix release addressing compatibility issues where reasoning models were rejecting the `tool_choice=required` parameter.

May 28, 2026

This is a maintenance release that fixes a CLI argument order issue, ensuring the pageId is passed as the first argument to the command-line interface.

May 27, 2026

A patch release fixing broken PyInstaller bundles by restoring missing agents SDK data and GraphQL (gql) files that were incorrectly excluded.

May 27, 2026

This release introduces HTTP header emulation and Cursor plugin configuration, alongside several stability improvements including CPU throttling fixes and clean shutdown handling.

May 26, 2026

A minor patch release focusing on CLI output improvements and documentation updates to support the v1.0.0 LTS version.

May 18, 2026

This is a critical security patch release that fixes a Remote Code Execution vulnerability (CVE-2026-8467) by removing the insecure HTTP '/storybook' endpoint.

May 15, 2026

This release introduces Electrobun as a dependency for building applications, providing CLI tools, core binaries, and optional CEF binaries that are automatically downloaded by the CLI.

May 4, 2026

This update improves the training pipeline by adding SDPA support and switching to torchaudio resampling, while fixing model loading issues and enhancing documentation.

Apr 28, 2026

Handy v0.8.3 introduces new features like AWS Bedrock integration, performance optimizations for local models, and various UI/UX fixes including toast notifications and Linux overlay support.

Apr 28, 2026

Bug fix release that updates the mcp-proxy dependency to resolve issues with the proxy functionality.

Apr 24, 2026

This moving release serves as a proxy that replicates the assets and commit hash of the latest CLI version (v1.1.0).

Apr 24, 2026