prettier-format

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

SERVERGo 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-go/prettier-format.md

WHAT IT DOES

What prettier-format does on Go

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

RISK

Why prettier-format is rated Medium

Prettier --write performs reversible formatting changes to files, which constitutes a Write operation. The severity is medium because unintended reformatting could alter code structure or introduce unexpected whitespace changes, though the operation is reversible (files can be reverted from version control).

From the tool's definition The tool uses Prettier with the --write flag, which modifies files in place by reformatting code. The description explicitly states it 'returns a structured list of changed files,' confirming file modification.

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 Go, 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 Go, 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 Go 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 Go 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 Go. 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 Go 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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