{"categories":[{"label":"Application Frameworks","url":"https://skillfed.io/packages/category/software-development-libraries-application-frameworks/4"}],"enrichment":{"capability":"Provides hardened patterns and utilities for building Model Context Protocol servers on top of FastMCP, including auth factories, tool filtering, telemetry integration, and server scaffolding.","skillfed_tags":["mcp-server","auth-patterns","telemetry"],"use_cases":["Build an MCP server with OIDC and JWT auth already wired, so each new server inherits the same verifier logic without hand-rolling auth middleware.","Implement tool filtering (read-only mode, no-destructive mode) by annotating tools and letting the library enforce the filters across all clients automatically.","Measure tool-list size before deployment to catch context-window truncation that would break agent interactions.","Share tool implementations between a CLI and an MCP HTTP server using the same decorators and registration functions, eliminating code duplication.","Integrate Sentry and Segment telemetry across both CLI and MCP paths without per-tool wiring; telemetry becomes a no-op if keys are not supplied.","Generate Markdown documentation for your tool surface automatically, with per-tool URLs for sharing with stakeholders."],"what_it_does":"FastMCP Extensions is a library that sits on top of FastMCP 3.x and encodes common patterns for shipping production MCP servers. Instead of reinventing auth, filtering, telemetry, and documentation scaffolding for each new server, you inherit them from a single opinionated base. The library provides factories for assembling auth verifiers (OIDC for browsers, JWT for machines, token introspection), tool filtering based on MCP annotations (read-only mode, destructive-operation gating, modality checks), and integration with Sentry and Segment for structured telemetry. It also includes a server factory that wires up server-info resources, credential resolution from HTTP headers or environment variables, and optional asset discovery.\n\nThe library is designed around a philosophy that a CLI and an MCP server should share the same tool implementations, not drift into separate code paths. It provides decorators for deferred tool and resource registration, test utilities to measure tool-list size and call tools programmatically, and auto-generated Markdown documentation. Telemetry and auth are wired once and inherited by every server built on the library, reducing the surface for misconfiguration and making it easier to apply security hardening uniformly across a fleet of servers.","worth_installing":"Yes, with conditions. Install if you are building multiple MCP servers or a production MCP deployment where auth, filtering, telemetry, and documentation consistency matter. The library is actively maintained, has low install friction, and is permissively licensed. However, it is still in Beta (Development Status 4), the auth factory's production readiness is not explicitly confirmed, and the ecosystem around FastMCP itself is young. Suitable for teams standardizing on MCP; less critical for a single throwaway server."},"id":"fastmcp-extensions","links":{"html":"https://skillfed.io/packages/fastmcp-extensions","md":"https://skillfed.io/packages/fastmcp-extensions.md","pypi":"https://pypi.org/project/fastmcp-extensions/"},"maintenance":{"status":"active"},"meta":{"latest_release":"2026-08-14","license_spdx":null,"license_treatment":"permissive","name":"fastmcp-extensions","python_support":"supports_current","summary":"Unofficial extension library for FastMCP 3.x with patterns, practices, and utilities"},"popularity":{"monthly_downloads":152514,"position":10899,"tier":"top_15000"},"security":{"n_vulnerabilities":0},"version":"0.21.0"}