develop

Enters or queries a Nix dev shell. When a command is provided, runs it inside the dev shell and returns the result.

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/develop.md

WHAT IT DOES

What develop does on Npm

AI agents invoke develop 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 develop is rated High

When a command is provided, the tool executes it inside a Nix dev shell. This constitutes arbitrary command execution, as the effects depend entirely on the command argument passed. This is an Execute category with high severity due to the potential for running arbitrary code in a shell environment.

From the tool's definition 'runs it inside the dev shell and returns the result' — executes arbitrary commands within a Nix dev shell environment

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs develop 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 develop, this is the rule to start with:

develop Rate-limited

develop 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": {
    "develop": {
      "limits": [
        {
          "counter": "develop_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 develop call is checked against it from then on.

FAQ

Questions about develop

What does the develop tool do? +

Enters or queries a Nix dev shell. When a command is provided, runs it inside the dev shell and returns the result. 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 develop? +

Register the Npm MCP server in PolicyLayer and add a rule for develop: 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 develop? +

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

Can I rate-limit develop? +

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

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

develop 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

More on Npm, and thousands of servers like it.

This server

All 202 Npm tools → High-risk tools on this server →

Across the catalogue

All high-risk MCP tools → The MCP Attack Database →

Guides

Govern code and CI agents →Agent sandbox →Least privilege for MCP →