pnpm_add · Promethean OS MCP: Risk & Policy

WHAT IT DOES

What pnpm_add does on Promethean OS MCP

AI agents use pnpm_add to create or update resources in Promethean OS MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Promethean OS MCP environment.

WHY IT NEEDS A POLICY

Why pnpm_add needs a policy

This tool creates or modifies package.json and lock files by adding dependencies—a reversible write operation. It does not execute arbitrary code (Execute category) or permanently delete data (Destructive). While it could indirectly affect system behavior if malicious packages are injected, the primary action is data modification.

From the tool's definition Tool name is 'pnpm_add' and description states 'Add dependencies via pnpm', indicating it modifies the package manifest and dependency tree by creating/adding entries.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pnpm_add Rate-limited

pnpm_add stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pnpm_add": {
      "limits": [
        {
          "counter": "pnpm_add_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about pnpm_add

What does the pnpm_add tool do? +

Add dependencies via pnpm, optionally scoped to specific workspace packages. It is categorised as a Write tool in the Promethean OS MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pnpm_add? +

Register the Promethean OS MCP server in PolicyLayer and add a rule for pnpm_add: 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 Promethean OS MCP. Nothing to install.

What risk level is pnpm_add? +

pnpm_add is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit pnpm_add? +

Yes. Add a rate_limit block to the pnpm_add 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 pnpm_add completely? +

Set action: deny in the PolicyLayer policy for pnpm_add. 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 pnpm_add? +

pnpm_add is provided by the Promethean OS MCP server (octave-commons/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.