unstar_repository · GitHub MCP Server MCP: Risk & Policy

WHAT IT DOES

What unstar_repository does on GitHub MCP Server

AI agents use unstar_repository 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 unstar_repository needs a policy

Unstarring a repository removes a star (a social/bookmarking action) from a GitHub repository. This is a reversible write action (the user can re-star at any time) with minimal blast radius. The empty description lowers confidence slightly, but the name strongly implies this social interaction toggle.

From the tool's definition Tool name 'unstar_repository' — description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unstar_repository Rate-limited

unstar_repository 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": {
    "unstar_repository": {
      "limits": [
        {
          "counter": "unstar_repository_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 unstar_repository

What does the unstar_repository tool do? +

unstar_repository. 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 unstar_repository? +

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

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

Can I rate-limit unstar_repository? +

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

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

unstar_repository 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.