prettier-format
Formats files with Prettier (--write) and returns a structured list of changed files.
This record as markdown: /tools/io-github-dave-london-pare-search/prettier-format.md
What prettier-format does on Search
AI agents use prettier-format to create or update resources in Search, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Search environment.
Why prettier-format is rated Medium
The tool modifies files in place using the --write flag, making it a Write operation. While formatting is reversible and non-destructive, it permanently alters file content. The blast radius is medium because unintended formatting of critical files could break builds or introduce unwanted changes, though the operation itself is reversible by version control or undo.
From the tool's definition Tool uses Prettier with '--write' flag which modifies files on disk. Description explicitly states it 'Formats files' and returns 'changed files', indicating reversible modifications to file content.
Attacks that exploit this kind of access
The rule that runs prettier-format safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Search, 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 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Search, apply this rule, and every prettier-format call is checked against it from then on.
Questions about prettier-format
Formats files with Prettier (--write) and returns a structured list of changed files. It is categorised as a Write tool in the Search MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Search 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 Search. Nothing to install.
prettier-format is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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.
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.
prettier-format is provided by the Search 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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