crow_list_posts

THE RISK

Low Risk

Why crow_list_posts needs a policy

The tool performs a read-only query operation to retrieve and filter blog posts. It retrieves or queries data without creating, modifying, deleting, or executing any side effects. This is characteristic of the Read category with low severity since it has minimal blast radius—even if an AI misuses it, it can only access existing post data without causing harm.

From the tool's definition Tool name 'crow_list_posts' and description 'List blog posts with filtering' indicate a data retrieval operation with no modification or execution of external operations.

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

POLICY

How to control crow_list_posts

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_posts:

policy.json

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

crow_list_posts 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 →
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FAQ

Questions about crow_list_posts

What does the crow_list_posts tool do? +

List blog posts with filtering. 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_posts? +

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

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

Can I rate-limit crow_list_posts? +

Yes. Add a rate_limit block to the crow_list_posts 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_posts completely? +

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

crow_list_posts 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 →