crow_discover_relays

THE RISK

Low Risk

Why crow_discover_relays needs a policy

This tool performs information retrieval only (listing and discovery). It has no side effects, does not modify state, and does not execute external operations or trigger destructive actions. The blast radius of misuse is minimal — an attacker would gain visibility into relay configuration but cannot alter infrastructure or cause harm. Confidence is high because the description is clear and unambiguous.

From the tool's definition Tool description states 'List configured relays and discover new ones' — both are read operations that retrieve information about relays without modifying or deleting data.

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

POLICY

How to control crow_discover_relays

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 crow_discover_relays:

policy.json

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

crow_discover_relays 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.

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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.
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FAQ

Questions about crow_discover_relays

What does the crow_discover_relays tool do? +

List configured relays and discover new ones. Relays enable offline message delivery and contact discovery. 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 crow_discover_relays? +

Register the Crow MCP server in PolicyLayer and add a rule for crow_discover_relays: 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 crow_discover_relays? +

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

Can I rate-limit crow_discover_relays? +

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

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

crow_discover_relays 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.

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