FastMCP
Latest release v4.2.0a1 on 2026-10-27 · Actively maintained · 15 releases in 90 days
🚀 The fast, Pythonic way to build MCP servers and clients.
| Latest release | v4.2.0a1 on 2026-10-27 |
|---|---|
| Maintenance | Actively maintained — pushed within the last 14 days, with 3 or more releases in 90 days |
| Stars | 28,230 |
| Releases in 90 days | 15 |
| Last commit | 2026-10-29 |
| Repository | PrefectHQ/fastmcp |
| Licence | Apache-2.0 |
| Open issues | 583 |
FastMCP release notes and changelog
v4.2.0a1 2026-10-27
What's new
- Add skills discovery to ClientGroup
- Add --skills to fastmcp list
- Add Client.readskill and tighten skills docs
- Add v4.2.0a1 changelog entries
Fixed
- Make the version-check InvalidURL regression independent of proxy parsing
- Build the Prefab renderer page on read, not on resources/list
- Install mounted skills under their own name in syncskills
- Stage skill exports before replacing installed files
Changed
- Make Skill a storage-neutral object with folders as one loader
- Rename the resource-era listskills helper to listskillsummaries
v4.1.4 2026-10-26
What's new
- Add server authoring guidance through the docs site
- Add a downstream smoke for Redis credential providers
Fixed
- Forward maxsseeventsize through StreamableHttpTransport
- Fix maintained skill discovery on the docs site
- Publish regular skill files for Mintlify discovery
- Serialize HTTP and SSE transports in generate-cli
Changed
- Bump certifi to 2026.10.19
v4.1.3 2026-10-20
What's new
- Add v4.1.3 changelog entries
Fixed
- Default the upstream token auth method to none without a client secret
- Preserve empty session visibility selections
- Make unreachable proxy failures deterministic by and
- Materialize generator transformfn results in TransformedTool.run by and
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- Activepieces · 0.87.3-hotfix.1
- MCP Toolbox · v1.15.0
Maintenance status is derived from public repository activity — release cadence and commit recency. It is not a review, an endorsement, or a security assessment. Star counts measure attention, not quality.