Skills/npm/fastmcp-ts

fastmcp-ts@1.10.0

VERIFIED· install only

Publisher claims: "🏎️ The official FastMCP TypeScript library - build MCP servers and clients, fast 🏎️" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher prefecthq · publishing for 714 daysInstalls 85,883Last detonated 39 h ago
$claude mcp add fastmcp-ts -- npx -y @prefecthq/fastmcp-ts
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Coverage

Nothing executable in the bundle ran; the trace covers the install step only.
Tested
every file read, file written and host contacted by what ran
Not tested
use of the skill by an agent

Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (1 scenario; nothing executable in the bundle ran; the trace covers the install step only) on 2026-11-12 and scored it 83/100 (Verified). In what ran, nothing we could detect went wrong: no undeclared network egress, no credential reads, no persistent instruction writes. What it does with a real credential was not observed; the static findings and the publisher carry the rest of the score. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 0 s · 1 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
0.0sprocessscript backend runs setup only
0.0sprocessscript backend runs setup only
0.0sprocessno install scripts to re-run

Static findings

MEDIUM
npx invocation of non-well-known packagepackage.json:64 · npx invocation of non-well-known package — may execute untrusted code"docs:links": "cd docs && npx --yes mint@latest broken-links",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/client.js:1025 · npx invocation of non-well-known package — may execute untrusted code"docs:links": "cd docs && npx --yes mint@latest broken-links",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagepackage.json:62 · npx invocation of non-well-known package — may execute untrusted code"docs:dev": "cd docs && npx --yes mint@latest dev",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/client.js:1023 · npx invocation of non-well-known package — may execute untrusted code"docs:dev": "cd docs && npx --yes mint@latest dev",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Unicode escape sequence detecteddist/server.js:1364 · Unicode escape sequence detected — may contain obfuscated payloads…u2026" : "...", reload: isUnicode ? "\u21BA" : "~", separator: isUnicode ? "\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\…Fix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.
AST07
HIGH
Access to sensitive file pathsdist/client.js:758 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesthis.env = options?.env;Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Destructive file system command detecteddist/server.js:580 · Destructive file system command detected// - explicit `emit`: byte-identical to the pre-logger-injection formatFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05

Cost to the agent

Instructions loaded
≈50 tok
1 file · 9 in bundle

Tokens estimated at four characters each. Skills load their instruction text when triggered; the figure is what that costs.

Known vulnerabilities

No advisories in OSV for @prefecthq/fastmcp-ts@1.10.0 as of 38 h ago. This is the package itself, not its dependencies.