gem-install · Python MCP: Risk & Policy

WHAT IT DOES

What gem-install does on Python

AI agents invoke gem-install to trigger actions in Python. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why gem-install needs a policy

Installing a Ruby gem executes an external operation (gem install) that modifies the system environment by downloading and installing packages. This goes beyond a simple write operation as it runs an external command with potential side effects on the system. Severity is medium because it can introduce arbitrary code/packages into the environment, but is generally reversible via uninstall.

From the tool's definition gem-install — installs a Ruby gem, triggering an external package installation operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

gem-install Rate-limited

gem-install stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gem-install": {
      "limits": [
        {
          "counter": "gem-install_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Python, so you can run agents against it safely.

FAQ

Questions about gem-install

What does the gem-install tool do? +

Installs a Ruby gem using. It is categorised as a Execute tool in the Python MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on gem-install? +

Register the Python MCP server in PolicyLayer and add a rule for gem-install: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Python. Nothing to install.

What risk level is gem-install? +

gem-install is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit gem-install? +

Yes. Add a rate_limit block to the gem-install rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block gem-install completely? +

Set action: deny in the PolicyLayer policy for gem-install. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides gem-install? +

gem-install is provided by the Python MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

// THE FULL RECORD

gem-install is one line of Python's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

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