prettier-format

Formats files with Prettier (--write) and returns a structured list of changed files.

SERVERLint SOURCEDave-London/Pare

Medium RISK CLASS

Category Write

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-lint/prettier-format.md

WHAT IT DOES

What prettier-format does on Lint

AI agents use prettier-format to create or update resources in Lint, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Lint environment.

RISK

Why prettier-format is rated Medium

This tool modifies files reversibly by applying code formatting. While the changes are reversible (the original code logic remains intact, only whitespace/style is affected), it still writes to the filesystem and alters file contents. It does not delete data irreversibly, execute arbitrary commands, or trigger financial transactions, so Write is the most appropriate category.

From the tool's definition Tool description states it 'Formats files with Prettier (--write)' and 'returns a structured list of changed files.' The --write flag indicates files are modified in-place.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs prettier-format safely

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

prettier-format Rate-limited

prettier-format 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": {
    "prettier-format": {
      "limits": [
        {
          "counter": "prettier-format_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Lint, apply this rule, and every prettier-format call is checked against it from then on.

FAQ

Questions about prettier-format

What does the prettier-format tool do? +

Formats files with Prettier (--write) and returns a structured list of changed files. It is categorised as a Write tool in the Lint MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

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

Register the Lint MCP server in PolicyLayer and add a rule for prettier-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 Lint. Nothing to install.

What risk level is prettier-format? +

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

Can I rate-limit prettier-format? +

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

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

prettier-format is provided by the Lint 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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