update_pull_request · Mcp Gmail MCP: Risk & Policy

WHAT IT DOES

What update_pull_request does on Mcp Gmail

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

WHY IT NEEDS A POLICY

Why update_pull_request needs a policy

This tool modifies PR metadata reversibly rather than deleting it or executing arbitrary code. The impact is scoped to a single PR's editable fields. Severity is medium because unauthorized updates to PRs could mislead code review, block merges, or disrupt collaboration workflows, but the changes are reversible and don't affect production systems directly.

From the tool's definition Tool name 'update_pull_request' and description 'Update an existing pull request in a GitHub repository' indicate modification of existing data (PR details, title, description, labels, etc.) without deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_pull_request Rate-limited

update_pull_request 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": {
    "update_pull_request": {
      "limits": [
        {
          "counter": "update_pull_request_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 Mcp Gmail, so you can run agents against it safely.

FAQ

Questions about update_pull_request

What does the update_pull_request tool do? +

Update an existing pull request in a GitHub repository. It is categorised as a Write tool in the Mcp Gmail MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_pull_request? +

Register the Mcp Gmail MCP server in PolicyLayer and add a rule for update_pull_request: 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 Mcp Gmail. Nothing to install.

What risk level is update_pull_request? +

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

Can I rate-limit update_pull_request? +

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

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

update_pull_request is provided by the Mcp Gmail MCP server (@monsoft/mcp-gmail). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.