wf_list_collections

THE RISK

Low Risk

Why wf_list_collections needs a policy

This tool retrieves and displays existing collections without modifying, deleting, or executing any operations. It is scoped to the authenticated user's own collections, limiting blast radius. The operation is read-only and reversible in nature.

From the tool's definition Tool name contains 'list' and description states 'List blog collections owned by the authenticated user' - a query operation with no side effects.

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

POLICY

How to control wf_list_collections

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 wf_list_collections:

policy.json

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

wf_list_collections 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 wf_list_collections

What does the wf_list_collections tool do? +

List blog collections owned by the authenticated user. 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 wf_list_collections? +

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

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

Can I rate-limit wf_list_collections? +

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

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

wf_list_collections 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 →