create_patch

Create a patch file from differences between files or directories

SERVERCode MCP Server SOURCEagentics-ai/code-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/agentics-ai-code-mcp/create-patch.md

WHAT IT DOES

What create_patch does on Code MCP Server

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

RISK

Why create_patch is rated Medium

This tool creates new patch files, which are reversible modifications to code. While patches themselves are non-destructive artifacts, they enable code changes. The severity is medium because misuse could result in creating patches that introduce bugs or security issues when applied elsewhere, but the tool itself only creates metadata files rather than directly modifying source.

From the tool's definition Tool creates patch files from file/directory differences. Patches are text representations of changes that can be applied to modify source code. The description states 'Create a patch file' which is a write/create operation.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_patch safely

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

create_patch Rate-limited

create_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": {
    "create_patch": {
      "limits": [
        {
          "counter": "create_patch_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Code MCP Server, apply this rule, and every create_patch call is checked against it from then on.

FAQ

Questions about create_patch

What does the create_patch tool do? +

Create a patch file from differences between files or directories. It is categorised as a Write tool in the Code 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 create_patch? +

Register the Code MCP Server MCP server in PolicyLayer and add a rule for create_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 Code MCP Server. Nothing to install.

What risk level is create_patch? +

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

Can I rate-limit create_patch? +

Yes. Add a rate_limit block to the create_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 create_patch completely? +

Set action: deny in the PolicyLayer policy for create_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 create_patch? +

create_patch is provided by the Code MCP Server MCP server (agentics-ai/code-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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