apply_patch_and_commit · Fs Git MCP: Risk & Policy

WHAT IT DOES

What apply_patch_and_commit does on Fs Git

AI agents use apply_patch_and_commit to create or update resources in Fs Git — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Fs Git environment.

WHY IT NEEDS A POLICY

Why apply_patch_and_commit needs a policy

This tool creates or modifies data reversibly by applying patches to files and committing them to git. While patches can theoretically delete content, the primary action is modification with commit history, making it Write rather than Destructive. The reversibility through git commits and the ability to revert makes this Write-category.

From the tool's definition Tool name 'apply_patch_and_commit' directly indicates it applies patches (modifies files) and commits changes. The description is minimal but the name clearly shows write operations paired with git commits.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

apply_patch_and_commit Rate-limited

apply_patch_and_commit 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": {
    "apply_patch_and_commit": {
      "limits": [
        {
          "counter": "apply_patch_and_commit_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Fs Git, so you can run agents against it safely.

FAQ

Questions about apply_patch_and_commit

What does the apply_patch_and_commit tool do? +

Apply patch and commit. It is categorised as a Write tool in the Fs Git MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on apply_patch_and_commit? +

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

What risk level is apply_patch_and_commit? +

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

Can I rate-limit apply_patch_and_commit? +

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

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

apply_patch_and_commit is provided by the Fs Git MCP server (wojons/fs-git-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.