mcp-evals: A Node.js package and GitHub Action for evaluating MCP tool implementations using LLM-based scoring

by mclenhard · MCP Server · ★ 132

Last updated: · Indexed by AgentSkillsHub · Auto-synced every 8h

How to install mcp-evals

npm install mcp-evals

Taken from the project's README on GitHub.

Security audit verdict: SAFE · quality 79/100

None of the 42 rules matched — no credential harvesting, no data exfiltration, no curl-pipe-shell installer. Scanned against 42 published rules built on the SlowMist agent-security taxonomy, refreshed every 8 hours.

The quality score combines nine heuristic checks of the repo and its README: completeness, clarity, specificity, examples, structure, agent readiness, step-by-step content, instruction quality and security notes. It rates how well the project explains itself to an agent, not the code.

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Quick Facts

Stars132
Forks14
LanguageTypeScript
CategoryMCP Server
LicenseMIT
Quality Score79/100
Open Issues7
Last Updated2025-06-23
Created2025-04-23
Platformsmcp, node
Est. Tokens~14k

About mcp-evals

MCP Evals A Node.js package and GitHub Action for evaluating MCP (Model Context Protocol) tool implementations using LLM-based scoring, with built-in observability support. This helps ensure your MCP server's tools are working correctly, performing well, and are fully observable with integrated monitoring and metrics.

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How this security grade is produced

Grades come from a rule-based scan built on the SlowMist agent-security taxonomy: 42 published rules, covering credential harvesting, data exfiltration, curl | sh installers and more. It is a first-layer scan, not a manual audit — we say so rather than overstate it.

The scale of the problem is documented independently: Liu et al. (2026), in a study of 31,132 agent skills, report that 26.1% contain security vulnerabilities. Our own full-catalog census is published as a citable open dataset.

Sources & who's responsible:

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