create_milestone · Mcp Gmail MCP: Risk & Policy

WHAT IT DOES

What create_milestone does on Mcp Gmail

AI agents use create_milestone 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 create_milestone needs a policy

The tool creates a new milestone, which is a Write operation—it creates data in a reversible manner. The severity is medium because creating milestones could clutter a repository or be used to spam/disrupt project planning, but the impact is reversible and scoped to milestone management.

From the tool's definition Tool description: 'Create a new milestone in a GitHub repository' - this creates new data (a milestone) in a repository, a reversible operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_milestone Rate-limited

create_milestone 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_milestone": {
      "limits": [
        {
          "counter": "create_milestone_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 create_milestone

What does the create_milestone tool do? +

Create a new milestone 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 create_milestone? +

Register the Mcp Gmail MCP server in PolicyLayer and add a rule for create_milestone: 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 create_milestone? +

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

Can I rate-limit create_milestone? +

Yes. Add a rate_limit block to the create_milestone 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_milestone completely? +

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

create_milestone 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.