fastmcp Releases

A new JSON Schema adapter is added to support plain JSON Schema definitions, simplifying the process of defining schemas for the FastMCP framework.

Jul 25, 2026

This release addresses a bug where a warning was generated regarding client capabilities when running in stateless mode, improving stability for stateless deployments.

Jul 25, 2026

A bug fix is included to ensure that OAuth proxy state is properly persisted, preventing authentication failures during the OAuth flow.

Jul 25, 2026

Enhances the development environment by adding support for non-interactive tool execution.

Jul 24, 2026

Fixes process management issues by ensuring stdin listeners are properly attached.

Jul 23, 2026

Jul 23, 2026

Introduces AI channel configuration capabilities, allowing users to manage multiple model channels in system settings and select specific channels for different conversations.

Jul 23, 2026

Refactors role selection to persist per conversation task, ensuring that switching tasks automatically restores the correct role context.

Jul 22, 2026

Adds support for resource subscriptions and list-changed capabilities, addressing issue #185.

Jul 21, 2026

This release focuses on bug fixes related to Git integration, specifically correcting git state refresh timing and preserving process environment variables for commit author resolution.

Jul 20, 2026

Fixes authentication handling by returning a specific 401 status code instead of relying on error-message heuristics.

Jul 18, 2026

Updates the jose peer dependency range to support version 6.

Jul 17, 2026

This release introduces a wide array of new Web APIs including SharedWorker and EventSource, refactors HTTP networking with caching and redirect support, and significantly enhances the Agent/MCP capabilities with Vertex AI and multi-session support. It also improves DOM and CSS spec conformance, adds performance optimizations, and introduces CLI tools like Prometheus metrics.

Jul 17, 2026

This release enables tool results to carry MCP metadata, allowing for richer data exchange and structured responses within the framework.

Jul 16, 2026

This release introduces support for elicitation, a new mechanism to handle interactions and configuration within the MCP framework.

Jul 16, 2026

This release allows resources and prompts to load with client context, including client info, logs, and session details for better tracking.

Jul 15, 2026

This maintenance release focuses on updating the signing identity and establishing a chain of trust for Apple signing certificates to ensure proper code verification.

Jul 13, 2026

A solid update bringing the first platform spider template and performance improvements.

Jul 12, 2026

This release improves GPU handling and adds user interface enhancements, specifically focusing on better model descriptions and the ability to cancel downloads during onboarding.

Jul 12, 2026

A comprehensive bug-fix update featuring performance optimizations for audio initialization, stability improvements for tray icons and memory handling, and new localization support.

Jul 10, 2026