crow_media_list_sources

THE RISK

Low Risk

Why crow_media_list_sources needs a policy

This tool only retrieves and displays information about subscribed news sources. It has no side effects, does not modify any data, and does not execute external operations. It is a simple query that returns configuration or status information, fitting the Read category with low severity since the blast radius of misuse is minimal—an agent could only view the list of news sources the user is already subscribed to.

From the tool's definition Tool name contains 'list' and description states 'List subscribed news sources with status' — a straightforward data retrieval operation with no modification, deletion, or execution.

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

POLICY

How to control crow_media_list_sources

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_media_list_sources:

policy.json

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

crow_media_list_sources 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 →

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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.
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FAQ

Questions about crow_media_list_sources

What does the crow_media_list_sources tool do? +

List subscribed news sources with status. 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_media_list_sources? +

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

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

Can I rate-limit crow_media_list_sources? +

Yes. Add a rate_limit block to the crow_media_list_sources 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_media_list_sources completely? +

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

crow_media_list_sources 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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