Safe AI Agent — Guard Checks (free MCP server)

A free, read-only MCP server with three diagnostic tools for people who runAI agents in production. Distilled from the Safe AI Agent Pack — theproduction guard modules used by the Sage personal agent and the Growl AImarketing SaaS.

No network calls. No writes. Inputs that look like real secrets are refused.

Tools

Tool	What it does
`audit_api_keys`	Flags over-privileged API keys from their permission descriptions (never pass key values — secret-looking entries are rejected, not stored)
`check_idempotency_pattern`	Scans a code snippet for the signals that actually stop duplicate execution: idempotency key, server-side store, uniqueness, short-circuit, payload binding, approval separation
`explain_guard_pattern`	Explains a production guard pattern — the failure it prevents and its minimal shape (`idempotency_key`, `approval_gate`, `outbox`, `key_inventory`, `circuit_breaker`, `signed_approval_link`)

Install & run

git clone <this repo>
cd safe-agent-mcp
python3 -m venv .venv && .venv/bin/pip install -r requirements.txt
.venv/bin/python safe_agent_mcp.py   # stdio transport

Claude Desktop / Cursor MCP config:

{
  "mcpServers": {
    "safe-agent-guard-checks": {
      "command": "/path/to/.venv/bin/python",
      "args": ["/path/to/safe_agent_mcp.py"]
    }
  }
}

Test

.venv/bin/python test_server.py   # in-memory client; calls every tool

The full pack

This free server is the diagnostic front door. The production modules —SQLite idempotency store, @once decorator, approval outbox with HMAC-signedapproval links, the token-privilege inventory script, 18 regression tests andthe 100 production-traps catalog — ship in theSafe AI Agent Pack ($69 / team $199).

License

MIT for this free server. The paid pack has its own commercial license.

Get the kit

Starter Kit ($19) — the 24-traps checklist + guard-patterns guide bundle: https://whop.com/growl-ai/safe-ai-agent-starter-kit-guardrails-for-ai-agents
Full Pack ($69 / team $199) — 100-traps catalog, working modules, sabotage-test playbook: https://growl-ai.com/store/en
Background reading: Idempotency Keys, Explained (dev.to)

Safe AI Agent — Guard Checks (free MCP server)