mastodon_search

THE RISK

Low Risk

Why mastodon_search needs a policy

This tool retrieves and queries data from Mastodon (accounts, hashtags, statuses) without side effects. The WebFinger resolution is a lookup mechanism, not a write or destructive action. Rate limiting (60/hour) is a standard constraint on read operations. Classification as Read is appropriate; the worst misuse would be information gathering or enumeration, which carries low blast radius.

From the tool's definition Tool description explicitly states 'Search accounts/hashtags/statuses' and performs 'remote queries' without modification. No creation, deletion, or execution of code is mentioned.

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

POLICY

How to control mastodon_search

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mastodon_search": {}
  }
}

mastodon_search is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mastodon_search

What does the mastodon_search tool do? +

Search accounts/hashtags/statuses. Remote queries resolve via WebFinger when resolve=true. Rate-limited: 60/hour. It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on mastodon_search? +

Register the Crow MCP server in PolicyLayer and add a rule for mastodon_search: 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 Crow. Nothing to install.

What risk level is mastodon_search? +

mastodon_search is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit mastodon_search? +

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

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

mastodon_search is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crow tool call.

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

CHECK YOUR STACK →