npm_update · NPM MCP Server MCP: Risk & Policy

WHAT IT DOES

What npm_update does on NPM MCP Server

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

WHY IT NEEDS A POLICY

Why npm_update needs a policy

This tool creates or modifies project dependencies by updating packages to newer versions. While reversible (can downgrade or reinstall previous versions), it is a consequential write operation that changes the project state and could introduce breaking changes or unexpected behavior if dependencies are updated without proper testing.

From the tool's definition Tool name 'npm_update' and description 'Actualizar paquetes a sus últimas versiones' (Update packages to their latest versions) indicates modification of package dependencies in a project's package.json and node_modules.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

npm_update Rate-limited

npm_update 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": {
    "npm_update": {
      "limits": [
        {
          "counter": "npm_update_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 NPM MCP Server, so you can run agents against it safely.

FAQ

Questions about npm_update

What does the npm_update tool do? +

Actualizar paquetes a sus últimas versiones. It is categorised as a Write tool in the NPM MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on npm_update? +

Register the NPM MCP Server MCP server in PolicyLayer and add a rule for npm_update: 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 MCP Server. Nothing to install.

What risk level is npm_update? +

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

Can I rate-limit npm_update? +

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

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

npm_update is provided by the NPM MCP Server MCP server (kpangaa/npm-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.