generate_pr_description · Pr Narrator MCP: Risk & Policy

WHAT IT DOES

What generate_pr_description does on Pr Narrator

AI agents use generate_pr_description 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_description needs a policy

This tool creates or modifies PR descriptions, which are reversible metadata on pull requests. It does not execute code, delete data, move money, or trigger external operations—it simply generates text content that documents changes.

From the tool's definition Tool name is 'generate_pr_description' and description states it will 'Generate a PR description with sections.' The verb 'generate' combined with 'description' indicates creation of new content.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_pr_description Rate-limited

generate_pr_description 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_description": {
      "limits": [
        {
          "counter": "generate_pr_description_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_description

What does the generate_pr_description tool do? +

Generate a PR description with sections. Auto-populates: -. 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_description? +

Register the Pr Narrator MCP server in PolicyLayer and add a rule for generate_pr_description: 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_description? +

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

Can I rate-limit generate_pr_description? +

Yes. Add a rate_limit block to the generate_pr_description 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_description completely? +

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

generate_pr_description 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.