Runs ruff format and returns structured results (files changed, file list).
AI agents invoke ruff-format to trigger actions in Http. 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.
This tool executes an external code formatting process (ruff format) that modifies files on disk. It is not purely read-only since it changes file contents, and it is not destructive in an irreversible sense (formatting can be reverted), but it does run an external command and alters files. Execute is the most appropriate category as it triggers an external operation whose effects depend on arguments.
From the tool's definition 'Runs ruff format' — actively executes the ruff formatter tool, modifying source files in place
Documented attack patterns abuse exactly the kind of access ruff-format gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Http, and nothing reaches the server without passing your rules. This is the rule we recommend for ruff-format:
{
"version": "1",
"default": "deny",
"tools": {
"ruff-format": {
"limits": [
{
"counter": "ruff-format_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}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.
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Runs ruff format and returns structured results (files changed, file list). It is categorised as a Execute tool in the Http MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Http 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 Http. Nothing to install.
ruff-format is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
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.
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.
ruff-format is provided by the Http MCP server (@paretools/http). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Http, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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