FastMCP is a Python framework for building Model Context Protocol applications, which connect language models with tools and data through servers and clients. Developers use it to expose Python functions as tools, connect to local or remote MCP servers, and build interactive tool interfaces. The catalogue includes eight skills, three instructions, two rules, one setting, and one hook for FastMCP.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/prefecthq/fastmcp/releasenpx skills add PrefectHQ/fastmcp --skill releasegit clone --depth 1 https://github.com/PrefectHQ/fastmcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/prefecthq/fastmcp/release)<a href="https://agentmods.dev/skills/prefecthq/fastmcp/release"><img src="https://agentmods.dev/badge/skills/prefecthq/fastmcp/release.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00083 | $0.02069 |
| Opus 5 | $0.00042 | $0.01035 |
| Sonnet 5 | $0.00017 | $0.00414 |
| Haiku 4.5 | $0.00008 | $0.00207 |
Grade A, and why
release scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
Confirm each package with `curl -fsS https://pypi.org/pypi/<pkg>/<new>/json | jq .info.version`; How it starts
The opening of the file, as written. The whole thing — 161 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cutting a release
A release is a tag on the branch that owns the line: <branch> below is main for
the current major and release/3.x for 3.x maintenance. Every step runs against that
branch, including the docs PR, so a maintenance entry lands in the maintenance
branch's own changelog above its newest 3.x entry. The tag triggers Publish fastmcp-slim to PyPI;
its success fans out to fastmcp-tasks, fastmcp-remote, and fastmcp, and the
fastmcp publish job opens the published-docs PR that makes gofastmcp.com reflect
the release. Two hand-maintained docs files mirror every release and must be on the
tagged commit, so the docs PR always lands first. PyPI releases are immutable; a bad
one gets a follow-up patch, never a re-tag.
Procedure
-
Preview what's in it.
git fetch origin && git log v<prev>..origin/<branch> --format='%h %s' gh api -X POST repos/PrefectHQ/fastmcp/releases/generate-notes \ -f tag_name=v<new> -f target_commitish=<branch> -f previous_tag_name=v<prev> --jq .bodyRead the two most recent releases for voice:
gh release list -L 5, thengh release view <tag>on each. -
Propose titles. Titles are
v<version>: <pun>, pun on the release's main theme from the release preview. Check prior titles withgh release list --repo PrefectHQ/fastmcp --limit 60to avoid repeats and keep the options on brand: two to four words, a familiar phrase bent toward the theme ("Cache Me If You Can", "Trust, but Proxy", "Come Back Any Time"), and a running family for a major's prereleases ("Fourst Contact", "Group Effourt"). Offer several; the maintainer picks. Draft the handwritten notes at the same time: one or two sentences for a patch, narrative prose for a point release. Get sign-off on both before anything is pushed. -
Write the notes file outside the repository (a temp directory), intro only. The release title is the heading, so the file has none.
-
Docs entries. Branch
docs/changelog-<new>fromorigin/<branch>and insert both blocks (the last argument is the branch the notes are generated against):
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- today Changed · +1 lines 8babb30cf7af
- yesterday First seen · 160 lines · 83 tokens per session scan A ad6164e836b2
release is a skill published in the GitHub repository PrefectHQ/fastmcp (27,528 stars, last pushed today), licensed Apache-2.0. It adds 83 tokens to every session and 2,069 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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agent-framework-py-release
Use when cutting a Python release for the microsoft/agent-framework monorepo. Triggers on "bump py versions", "cut a python release", "prepare release PR for python", "release py packages", "bump python to X.Y.Z", or similar requests to bump Python package versions and prepare a release PR. Handles all four lifecycle…