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MCP Customs

Registre officiel Sécurité

Inspect an MCP server for common security risks before you install it. Offline, zero telemetry.

Code source Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

NPM package mcp-customs
Claude Code 
claude mcp add mcp-customs -- npx -y mcp-customs@0.1.1
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "mcp-customs": {
            "command": "npx",
            "args": [
                "-y",
                "mcp-customs@0.1.1"
            ]
        }
    }
}

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. mcp-customs
  2. Why
  3. What it checks (v0.1)
  4. CI usage
  5. Get a badge for your README
  6. Roadmap
  7. License

mcp-customs

Inspect an MCP server for common security risks before you install it. Runs fully offline. No telemetry, no cloud upload, no account.

npx mcp-customs scan ./some-mcp-server
──────────────────────────────────────────────────────
MCP-CUSTOMS INSPECTION REPORT
──────────────────────────────────────────────────────
target        ./some-mcp-server
files scanned 14
score         62 / 100
stamp         [ REVIEW ]
──────────────────────────────────────────────────────
[HIGH] MCP002 — Unsanitized file path (possible path traversal)
  server.js:41  return fs.readFileSync(userPath, 'utf8');
  fix: Resolve the path against an allowed base directory ...

Why

Developers install MCP servers the way they used to install npm packages — quickly, trusting the name, and moving on. An MCP server can read your files, call your APIs, and execute commands on your behalf. Almost nobody checks what it can actually do before connecting it to their agent.

mcp-customs is the "audit before install" step, run locally, in seconds.

What it checks (v0.1)

RuleSeverityWhat it looks for
MCP001criticalShell command execution with unsanitized interpolation
MCP002highFile reads/writes without a path-traversal guard
MCP003criticaleval() / dynamic code execution
MCP004highHardcoded API keys / credentials
MCP005criticalTool descriptions containing hidden-instruction language (prompt injection via the tool's own metadata)
MCP006mediumOutbound network calls combined with environment-variable reads (possible exfiltration)
MCP007lowNo permissions/scopes declared in the manifest

These are heuristic, regex-based checks — fast and fully auditable in one sitting, not a dataflow analysis. They will produce false positives and will miss things a deeper analysis would catch. Treat a CLEARED stamp as "nothing obvious," not "verified safe."

CI usage

# .github/workflows/mcp-customs.yml
- run: npx mcp-customs scan . --sarif results.sarif --fail-on high
- uses: github/codeql-action/upload-sarif@v3
  with:
    sarif_file: results.sarif

Get a badge for your README

npx mcp-customs scan . --badge --name your-server-name

Roadmap

  • [ ] Publish scan results to a public registry (mcp-customs.dev) with searchable trust scores
  • [ ] Dynamic/sandboxed analysis (catch what static checks miss)
  • [ ] Python-specific AST checks (current Python rules are regex-only)
  • [ ] Community flagging / verification on registry entries

License

Apache-2.0. No open-core trap — this CLI stays free either way. If a hosted registry/dashboard ships later, that's a separate paid product; this tool's local scanning will never require it.

Questions fréquentes

Qu'est-ce que MCP Customs ?

Inspect an MCP server for common security risks before you install it. Offline, zero telemetry.

Comment installer MCP Customs ?

Il s'exécute sur votre machine. Dans Claude Code : claude mcp add mcp-customs -- npx -y mcp-customs@0.1.1. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour MCP Customs ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

MCP Customs est-il open source ?

Oui. Son code est sur GitHub sous licence Apache-2.0.

Qui maintient MCP Customs ?

Il est publié par mcpcustoms. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.