Agent Guard MCP

Verify-before-act safety checks for AI agents: packages, lockfiles, manifests, CI workflows.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "agent-guard-mcp-2": {
      "command": "npx",
      "args": [
        "-y",
        "agent-guard-mcp-2"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

agent-guard-mcp

One line: Verify-before-act safety for AI agents — check packages, lockfiles, skill manifests, and CI workflows before install or merge. Zero API keys. Zero config.

Scores Cursor/Claude skill manifests + GitHub Actions workflows — not just npm dependencies.

When you…	Call
`npm install foo` / agent suggests a new dep	`check_package`
Review an LLM-generated lockfile	`verify_lockfile`
Install a Cursor skill or MCP plugin	`score_manifest`
Merge a PR touching `.github/workflows/*`	`check_workflow`

Call these before installing a dependency, merging a CI change, or installing a third-party skill/plugin — so an agent refuses hallucinated packages, typosquats, poisoned manifests, and compromised CI actions.

Exposes four MCP tools (also available as a plain HTTP service):

Tool	Use before…	Returns
`check_package`	adding a single npm/PyPI dependency	OK / SUSPICIOUS / DANGER + typosquat/slop flags
`verify_lockfile`	running `npm/pip/yarn install`	scans every direct + transitive dep in a lockfile
`score_manifest`	installing a Cursor/Claude skill or MCP/Smithery plugin	poison-signature + scope-overreach + drift score 0–100
`check_workflow`	merging a PR that touches CI	flags mutable action pins, compromised actions, curl\|bash, pwn-requests, secret exposure

Why

AI agents routinely hallucinate package names (slopsquatting), trust LLM-generated lockfiles, install unvetted skill packs, and pin CI actions to mutable tags. Each is a live supply-chain vector. This server gives an agent a cheap "is this safe?" call before it acts.

Install (MCP client)

config.json

{
  "mcpServers": {
    "agent-guard": { "command": "npx", "args": ["-y", "@liminallablibs/agent-guard-mcp@0.2.1"] }
  }
}

Agent rule (paste into Cursor Rules / CLAUDE.md)

Before installing any npm/PyPI package, running install from a lockfile, installing a third-party skill/MCP plugin, or merging CI workflow changes, call the agent-guard MCP tools (check_package, verify_lockfile, score_manifest, check_workflow). If verdict is SUSPICIOUS, REVIEW, or BLOCK/DANGER, stop and show findings to the user — do not proceed.

Quick demo

Terminal

npx -y @liminallablibs/agent-guard-mcp@0.2.1   # MCP clients spawn this via npx
# HTTP mirror:
npm run http && curl "http://localhost:8402/check?name=reactt&ecosystem=npm"
# → DANGER — typosquat of "react"

Or run directly:

Terminal

npm install
node src/mcp-server.mjs        # stdio MCP server
npm run http                   # optional HTTP mirror on :8402

HTTP endpoints (mirror of the MCP tools)

GET /check?name=<pkg>&ecosystem=<npm|pypi>
POST /check-lockfile {lockfile_content, format} — format ∈ package-lock.json | yarn.lock | pnpm-lock.yaml | poetry.lock | requirements.txt
POST /score-manifest {manifest_type, manifest_content}
POST /check-workflow {workflow_content}

License

MIT.

Read the full README →View source on GitHub →

Related MCP Servers

View all in Developer Tools View all alternatives

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about Agent Guard MCP

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "agent-guard-mcp": { "command": "npx", "args": ["-y", "agent-guard-mcp"] } }

AllMCPs Directory Badge

Full Badge Customizer

Showcase your server listing on GitHub or your project documentation. Embed this dynamic SVG badge to highlight official listing status and live engagement.

Badge Style:

Live Dynamic SVG Preview

Markdown (GitHub README)

[![AllMCPs](https://allmcps.com/api/badge/agent-guard-mcp-2?style=directory)](https://allmcps.com/mcp/agent-guard-mcp-2)

HTML Embed

<a href="https://allmcps.com/mcp/agent-guard-mcp-2"><img src="https://allmcps.com/api/badge/agent-guard-mcp-2?style=directory" alt="Agent Guard MCP on AllMCPs" /></a>

Technical Specs & Signals

CategoryDeveloper Tools

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

★ Featured

AllMCPs Server

The official MCP server for AllMCPs.com - submit and manage tools directly from your AI. The open directory for MCP servers. Connect Claude, Cursor, Windsurf, and AI agents to databases, tools, files, and APIs. Explore 10,000+ servers. AllMCPs is the premier, open directory for discovering, evaluating, and installing Model Context Protocol (MCP) servers to equip AI agents and LLMs with real-world superpowers.

Explore Server →

Own this project?

This directory is pre-filled from public sources. Claim via GitHub README, site badge, or DNS TXT to unlock edit access and the Official badge and attach your website — proof is checked automatically, then reviewed by our team.

Free dofollow backlink: add your website and place the AllMCPs badge on it — no claim needed. We detect it automatically and keep it verified as long as the badge stays live.

Claim & get free dofollow

Share & Embed

Add our SVG badge (dark/light directory styles) or embeddable widget to your site.

Explore more

More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Agent Guard MCP →Install in Claude Desktop Install in Cursor Install in VS Code

Documentation Overview

agent-guard-mcp

One line: Verify-before-act safety for AI agents — check packages, lockfiles, skill manifests, and CI workflows before install or merge. Zero API keys. Zero config.

Scores Cursor/Claude skill manifests + GitHub Actions workflows — not just npm dependencies.

When you…	Call
`npm install foo` / agent suggests a new dep	`check_package`
Review an LLM-generated lockfile	`verify_lockfile`
Install a Cursor skill or MCP plugin	`score_manifest`
Merge a PR touching `.github/workflows/*`	`check_workflow`

Exposes four MCP tools (also available as a plain HTTP service):

Tool	Use before…	Returns
`check_package`	adding a single npm/PyPI dependency	OK / SUSPICIOUS / DANGER + typosquat/slop flags
`verify_lockfile`	running `npm/pip/yarn install`	scans every direct + transitive dep in a lockfile
`score_manifest`	installing a Cursor/Claude skill or MCP/Smithery plugin	poison-signature + scope-overreach + drift score 0–100
`check_workflow`	merging a PR that touches CI	flags mutable action pins, compromised actions, curl\|bash, pwn-requests, secret exposure

Why

Install (MCP client)

config.json

{
  "mcpServers": {
    "agent-guard": { "command": "npx", "args": ["-y", "@liminallablibs/agent-guard-mcp@0.2.1"] }
  }
}

Agent rule (paste into Cursor Rules / CLAUDE.md)

Before installing any npm/PyPI package, running install from a lockfile, installing a third-party skill/MCP plugin, or merging CI workflow changes, call the agent-guard MCP tools (check_package, verify_lockfile, score_manifest, check_workflow). If verdict is SUSPICIOUS, REVIEW, or BLOCK/DANGER, stop and show findings to the user — do not proceed.

Quick demo

Terminal

npx -y @liminallablibs/agent-guard-mcp@0.2.1   # MCP clients spawn this via npx
# HTTP mirror:
npm run http && curl "http://localhost:8402/check?name=reactt&ecosystem=npm"
# → DANGER — typosquat of "react"

Or run directly:

Terminal

npm install
node src/mcp-server.mjs        # stdio MCP server
npm run http                   # optional HTTP mirror on :8402

HTTP endpoints (mirror of the MCP tools)

GET /check?name=<pkg>&ecosystem=<npm|pypi>
POST /check-lockfile {lockfile_content, format} — format ∈ package-lock.json | yarn.lock | pnpm-lock.yaml | poetry.lock | requirements.txt
POST /score-manifest {manifest_type, manifest_content}
POST /check-workflow {workflow_content}

License

MIT.