generate_pr · Pr Narrator MCP: Risk & Policy

WHAT IT DOES

What generate_pr does on Pr Narrator

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

WHY IT NEEDS A POLICY

Why generate_pr needs a policy

This tool creates or modifies PR metadata (title and description) in a version control system. While it does not directly execute code or delete data, it writes new content that becomes part of the codebase workflow.

From the tool's definition Tool description states it 'Generate[s] a PR title and description' which creates new content that will be written to a pull request. The tool is part of a server that 'Generates commit messages, PR titles and descriptions' indicating content creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_pr Rate-limited

generate_pr 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": {
    "generate_pr": {
      "limits": [
        {
          "counter": "generate_pr_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 Pr Narrator, so you can run agents against it safely.

FAQ

Questions about generate_pr

What does the generate_pr tool do? +

Generate a PR title and description. IMPORTANT: The returned. It is categorised as a Write tool in the Pr Narrator MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate_pr? +

Register the Pr Narrator MCP server in PolicyLayer and add a rule for generate_pr: 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 Pr Narrator. Nothing to install.

What risk level is generate_pr? +

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

Can I rate-limit generate_pr? +

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

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

generate_pr is provided by the Pr Narrator MCP server (mhaviv/pr-narrator-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.