fastmcp (PrefectHQ/fastmcp) is an MCP server listed on the M8ven Trust Index. It scores 86 out of 100, grade B. It declares 37 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
B
Emerging
86/100
8 days ago

fastmcp

🚀 The fast, Pythonic way to build MCP servers and clients.

→ PrefectHQ/fastmcp· listed on mcp_so

Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

How we verified

Code Verified⚡ Live Monitored: not connected

Verified is a snapshot. Live keeps it current, and builds your track record.

⚡ Connect GitHub → continuous verification on every pushwhy connect →

Who stands behind it

PrefectHQ

Source: mcp.so · also listed on github_code, github_topic

Maintenance & responsiveness
as of 2026-08-19
Issue response: median 19h
Issues closed (90d): 23 · 268 open
Releases (90d): 14
Contributor retention: 4/13 stayed · 21 active
Is this your MCP?

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Install from

mcp.soGitHubGitHub

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// key findings
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
🔐
You'll be asked for 2 credentials: GITHUB_TOKEN, HORIZON_API_KEY
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
🔐 secretGITHUB_TOKEN
configGITHUB_REPOSITORY_OWNER
configGITHUB_REPOSITORY_NAME
configFASTMCP_REMOTE_CONFIG_DIR
configFASTMCP_ENV_FILE
configXDG_CONFIG_HOME
configFASTMCP_UV_SPAWNED
🔐 secretHORIZON_API_KEY
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

38/38 tools missing one or more hints — my_tool (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); my_tool (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); my_tool (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +35 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Tool test coverage

17/38 tools referenced in tests (45%)

Write tests that reference each tool by name so every tool has at least one test.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 3 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Score](https://m8ven.ai/badge/mcp/prefecthq/fastmcp)](https://m8ven.ai/mcp/prefecthq/fastmcp)
Shows your grade and updates automatically. Prefer no grade? Append ?variant=verified to the badge URL.
commit: 07659a00ded66b9b9801fff702c00ce64d2cd902
code hash: c1cf687d6433bd71e3cfe74f62bd0d20faf625f0cd983a398dded8d2d5b2f876
verified: 9/2/2026, 11:25:33 PM
view raw JSON →
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