uv-run

Runs a command in a uv-managed environment and returns structured output.

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/uv-run.md

WHAT IT DOES

What uv-run does on Npm

AI agents invoke uv-run 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 uv-run is rated High

The uv-run tool executes commands in an isolated environment, which is an Execute operation because it triggers external processes with uncontrolled outcomes. The blast radius is high because a malicious agent could run any command (shell injection, dependency installation, code compilation, etc.) within that environment, though isolation may limit damage to that environment only.

From the tool's definition Tool description states it 'Runs a command in a uv-managed environment' — this permits arbitrary command execution with effects dependent on the supplied command argument.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs uv-run 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 uv-run, this is the rule to start with:

uv-run Rate-limited

uv-run 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": {
    "uv-run": {
      "limits": [
        {
          "counter": "uv-run_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 uv-run call is checked against it from then on.

FAQ

Questions about uv-run

What does the uv-run tool do? +

Runs a command in a uv-managed environment and returns structured output. 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 uv-run? +

Register the Npm MCP server in PolicyLayer and add a rule for uv-run: 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 uv-run? +

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

Can I rate-limit uv-run? +

Yes. Add a rate_limit block to the uv-run 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 uv-run completely? +

Set action: deny in the PolicyLayer policy for uv-run. 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 uv-run? +

uv-run 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.

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