crow_list_sources

THE RISK

Low Risk

Why crow_list_sources needs a policy

The tool performs a listing operation with filters, which is a read-only retrieval action. There is no indication of data creation, modification, deletion, code execution, or financial impact. The blast radius of misuse is minimal—an agent could only retrieve information it may not be authorized to see, but cannot cause irreversible damage or side effects.

From the tool's definition Tool name 'crow_list_sources' and description 'List sources with filtering options' indicate a query/retrieval operation with no modification of data.

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

POLICY

How to control crow_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_list_sources:

policy.json

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

crow_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.
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 crow_list_sources

What does the crow_list_sources tool do? +

List sources with filtering options. 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_list_sources? +

Register the Crow MCP server in PolicyLayer and add a rule for crow_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_list_sources? +

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

Can I rate-limit crow_list_sources? +

Yes. Add a rate_limit block to the crow_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_list_sources completely? +

Set action: deny in the PolicyLayer policy for crow_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_list_sources? +

crow_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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