create_pr_review · GitHub MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_pr_review does on GitHub MCP Server

AI agents use create_pr_review 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 create_pr_review needs a policy

Creating a pull request review is a reversible Write operation—it adds a review comment/approval to a PR, which can be edited or deleted. While not as severe as Destructive (deletion is irreversible), it modifies repository state. Severity is medium because PR reviews affect collaboration workflows and visibility, but the impact is bounded to review metadata and can be undone.

From the tool's definition Tool name 'create_pr_review' indicates creation of a pull request review. Sibling tools like 'create_issue', 'create_pull_request', and 'create_or_update_file' are Write operations that modify repository state reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_pr_review Rate-limited

create_pr_review 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_pr_review": {
      "limits": [
        {
          "counter": "create_pr_review_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 create_pr_review

What does the create_pr_review tool do? +

create_pr_review. 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 create_pr_review? +

Register the GitHub MCP Server MCP server in PolicyLayer and add a rule for create_pr_review: 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 create_pr_review? +

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

Can I rate-limit create_pr_review? +

Yes. Add a rate_limit block to the create_pr_review 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_pr_review completely? +

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

create_pr_review is provided by the GitHub MCP Server MCP server (software-engineer-mj/github-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.