createSiteFromGitHub · Netlify MCP Server MCP: Risk & Policy

WHAT IT DOES

What createSiteFromGitHub does on Netlify MCP Server

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

WHY IT NEEDS A POLICY

Why createSiteFromGitHub needs a policy

This tool creates new infrastructure (a Netlify site deployment) which is a reversible write operation. While creating infrastructure has blast radius (cost implications, potential resource sprawl), it is not destructive (can be undone via deleteSite) and not immediately financial.

From the tool's definition Tool name 'createSiteFromGitHub' and description 'Create a new Netlify site from a GitHub repository' indicate the tool creates new resources (a Netlify site) by connecting to an external repository.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

createSiteFromGitHub Rate-limited

createSiteFromGitHub 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": {
    "createSiteFromGitHub": {
      "limits": [
        {
          "counter": "createsitefromgithub_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 Netlify MCP Server, so you can run agents against it safely.

FAQ

Questions about createSiteFromGitHub

What does the createSiteFromGitHub tool do? +

Create a new Netlify site from a GitHub repository. It is categorised as a Write tool in the Netlify 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 createSiteFromGitHub? +

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

What risk level is createSiteFromGitHub? +

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

Can I rate-limit createSiteFromGitHub? +

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

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

createSiteFromGitHub is provided by the Netlify MCP Server MCP server (mcerqua/netlify-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.