createOrUpdateFile · GitHub MCP Server MCP: Risk & Policy

WHAT IT DOES

What createOrUpdateFile does on GitHub MCP Server

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

WHY IT NEEDS A POLICY

Why createOrUpdateFile needs a policy

This tool creates or updates files in a repository, which are reversible write operations. It does not delete data (would be Destructive), execute arbitrary code (would be Execute), or move money (would be Financial). However, the severity is high because unauthorized file modifications in a repository could corrupt source code, introduce malicious changes, or disrupt development workflows.

From the tool's definition Tool name 'createOrUpdateFile' and description 'Create or update a file in a GitHub repository' indicate reversible modification of repository content.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

createOrUpdateFile Rate-limited

createOrUpdateFile 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": {
    "createOrUpdateFile": {
      "limits": [
        {
          "counter": "createorupdatefile_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 GitHub MCP Server, so you can run agents against it safely.

FAQ

Questions about createOrUpdateFile

What does the createOrUpdateFile tool do? +

Create or update a file in a GitHub repository. It is categorised as a Write tool in the GitHub 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 createOrUpdateFile? +

Register the GitHub MCP Server MCP server in PolicyLayer and add a rule for createOrUpdateFile: 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 GitHub MCP Server. Nothing to install.

What risk level is createOrUpdateFile? +

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

Can I rate-limit createOrUpdateFile? +

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

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

createOrUpdateFile is provided by the GitHub MCP Server MCP server (j-nowcow/github-mcp-practice). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.