revert_patch · File Patch MCP Server MCP: Risk & Policy

WHAT IT DOES

What revert_patch does on File Patch MCP Server

AI agents use revert_patch to create or update resources in File Patch MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your File Patch MCP Server environment.

WHY IT NEEDS A POLICY

Why revert_patch needs a policy

This tool modifies file content by undoing previous patches, making it a Write operation rather than Destructive because: (1) the changes are reversible—the original patch state can be reapplied, (2) the operation is conditional on a prior patch having been applied, and (3) it restores a known prior state rather than irreversibly deleting data.

From the tool's definition Tool description states it 'Reverse a previously applied patch' and 'atomically reverts all changes'. The term 'reverse' and 'revert' indicate modification of existing file content back to a prior state, which is a write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

revert_patch Rate-limited

revert_patch 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": {
    "revert_patch": {
      "limits": [
        {
          "counter": "revert_patch_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 File Patch MCP Server, so you can run agents against it safely.

FAQ

Questions about revert_patch

What does the revert_patch tool do? +

Reverse a previously applied patch. For multi-hunk patches, atomically reverts all changes that were applied together. It is categorised as a Write tool in the File Patch MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on revert_patch? +

Register the File Patch MCP Server MCP server in PolicyLayer and add a rule for revert_patch: 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 File Patch MCP Server. Nothing to install.

What risk level is revert_patch? +

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

Can I rate-limit revert_patch? +

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

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

revert_patch is provided by the File Patch MCP Server MCP server (shenning00/patch_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.