gem-install

Installs a Ruby gem using

SERVERNpm SOURCEDave-London/Pare

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-dave-london-npm/gem-install.md

WHAT IT DOES

What gem-install does on Npm

AI agents invoke gem-install to trigger actions in Npm. 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.

RISK

Why gem-install is rated High

Installing a gem executes external code (pre/post-install scripts) and modifies the environment. It is not purely a write operation because arbitrary code from the gem may run during installation. The description is minimal but the tool name clearly implies package installation with potential side effects.

From the tool's definition gem-install — installs a Ruby gem, triggering external package download and execution of install scripts

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs gem-install safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Npm, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For gem-install, this is the rule to start with:

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.

The button opens the PolicyLayer dashboard: create your workspace, connect Npm, apply this rule, and every gem-install call is checked against it from then on.

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 Npm 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 Npm 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 Npm. 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 Npm MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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