fmt

Checks or fixes Rust formatting and returns structured output.

SERVERGit SOURCEDave-London/Pare

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-git/fmt.md

WHAT IT DOES

What fmt does on Git

AI agents invoke fmt to trigger actions in Git. 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 fmt is rated High

Running a formatter that can rewrite source files on disk is an Execute-class operation (it triggers an external process and may modify files). When in fix mode it also performs writes, but the dominant risk is the execution of an external tool that modifies code.

From the tool's definition 'fixes Rust formatting' — the tool can modify source files in place by reformatting them, and 'executes' the rustfmt toolchain to do so

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs fmt safely

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

fmt Rate-limited

fmt 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": {
    "fmt": {
      "limits": [
        {
          "counter": "fmt_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 Git, apply this rule, and every fmt call is checked against it from then on.

FAQ

Questions about fmt

What does the fmt tool do? +

Checks or fixes Rust formatting and returns structured output. It is categorised as a Execute tool in the Git MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on fmt? +

Register the Git MCP server in PolicyLayer and add a rule for fmt: 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 Git. Nothing to install.

What risk level is fmt? +

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

Can I rate-limit fmt? +

Yes. Add a rate_limit block to the fmt 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 fmt completely? +

Set action: deny in the PolicyLayer policy for fmt. 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 fmt? +

fmt is provided by the Git MCP server (Dave-London/Pare). 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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