gists_star

THE RISK

Medium Risk

Why gists_star needs a policy

Starring a gist is a reversible write operation (it can be unstarred). It modifies state on a remote service but has no destructive, financial, or execution implications. Blast radius is very low as it only affects the user's starred gists list.

From the tool's definition 'Star a gist' — starring is a reversible action that modifies a user's starred list without deleting or creating content

Documented attack patterns abuse exactly the kind of access gists_star gives an agent:

POLICY

How to control gists_star

PolicyLayer is an MCP gateway — it sits between your AI agents and TypeSpec MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for gists_star:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gists_star": {
      "limits": [
        {
          "counter": "gists_star_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

gists_star 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.

Create a free account and register TypeSpec MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More TypeSpec MCP Server tools

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All 28 TypeSpec MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about gists_star

What does the gists_star tool do? +

Star a gist. It is categorised as a Write tool in the TypeSpec 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 gists_star? +

Register the TypeSpec MCP Server MCP server in PolicyLayer and add a rule for gists_star: 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 TypeSpec MCP Server. Nothing to install.

What risk level is gists_star? +

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

Can I rate-limit gists_star? +

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

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

gists_star is provided by the TypeSpec MCP Server MCP server (microsoft/typespec-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every TypeSpec MCP Server tool call.

Start from TypeSpec MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →