ruff-format

Runs ruff format and returns structured results (files changed, file list).

SERVERDocker SOURCE@paretools/docker

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-docker/ruff-format.md

WHAT IT DOES

What ruff-format does on Docker

AI agents invoke ruff-format to trigger actions in Docker. 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 ruff-format is rated High

This tool executes an external code formatting command (ruff format) that modifies source files on disk. While formatting is reversible in principle, it actively runs a process and rewrites file contents, placing it in the Execute category. Misuse could cause unintended reformatting of source files across a codebase.

From the tool's definition 'Runs ruff format' — executes the ruff formatter tool against files, modifying them in place

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs ruff-format safely

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

ruff-format Rate-limited

ruff-format 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": {
    "ruff-format": {
      "limits": [
        {
          "counter": "ruff-format_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 Docker, apply this rule, and every ruff-format call is checked against it from then on.

FAQ

Questions about ruff-format

What does the ruff-format tool do? +

Runs ruff format and returns structured results (files changed, file list). It is categorised as a Execute tool in the Docker MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on ruff-format? +

Register the Docker MCP server in PolicyLayer and add a rule for ruff-format: 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 Docker. Nothing to install.

What risk level is ruff-format? +

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

Can I rate-limit ruff-format? +

Yes. Add a rate_limit block to the ruff-format 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 ruff-format completely? +

Set action: deny in the PolicyLayer policy for ruff-format. 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 ruff-format? +

ruff-format is provided by the Docker MCP server (@paretools/docker). 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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