Is Fastmcp Ts safe and trustworthy?

tashan scores Fastmcp Ts on public evidence — tashan score 73.0/100, it is currently active, no known advisories against the current release, its declared dependencies reach: filesystem. Audit scope: OSV advisories, install-time scripts, build provenance and declared permission surface. We do not review source code or execute the capability.

How do I install Fastmcp Ts?

In Claude Code: run `claude mcp add prefecthq-fastmcp-ts -- npx -y @prefecthq/fastmcp-ts`. In Cursor / Claude Desktop, add it to mcp.json / claude_desktop_config.json.

‹ The Index

Fastmcp Ts

npm

🏎️ The official FastMCP TypeScript library - build MCP servers and clients, fast 🏎️

Works with: Claude Code, Cursor, Claude Desktop, Codex CLI, Gemini CLI, Cline, Windsurf, VS Code (installable)
installable: each client documents how to load an MCP server of this type — that is the client's promise, not a claim verified against this capability

Install (Claude Code):

claude mcp add prefecthq-fastmcp-ts -- npx -y @prefecthq/fastmcp-ts

tashan score: 73.0
Adoption: 3.4k/wk
Upkeep: 83.0
Freshness: 99.0
Evidence coverage: 100% of the inputs this score can use
Health: active
License: Apache-2.0

Security audit

Every finding is shown in full — which advisory, the version that fixes it, and the exact command run at install time. Nothing in this audit is behind a licence.

No known advisoriesclearchecked against OSV for 1.5.1 — this package, not its dependency tree

Reads and writes filesfrom declared dependencies

Signed build provenancepublished from public CI with an attestation

What changed recently

2026-08-11 @prefecthq/fastmcp-ts now reaches filesystem Its declared dependencies reach further into your machine than they did before.
2026-08-15 @prefecthq/fastmcp-ts published 1.5.1, was 1.4.0 A new release is available.

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We recorded 2 changes to Fastmcp Ts in the last 45 days. Pro tells you on the day — for the servers in your own config, not the ones you thought to look up.

Every score since we started measuring, for any capability
The named replacement when something you run is dying — not just that it is
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npm ↗ · source ↗ · pkg:@prefecthq/fastmcp-ts

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Measured 2026-08-21 · scorer s5 · how · something wrong here?