changedetection_list_watches

THE RISK

Low Risk

Why changedetection_list_watches needs a policy

This tool retrieves and queries configuration data (list of monitored URLs and their metadata). It performs no creation, modification, deletion, code execution, or financial operations. The only risk is information disclosure of which URLs are being monitored, which is low severity in most contexts.

From the tool's definition Tool name 'changedetection_list_watches' and description 'List all configured watches (URLs being tracked) with their last-check and last-change timestamps' indicate a data retrieval operation with no modification or side effects.

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

POLICY

How to control changedetection_list_watches

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 changedetection_list_watches:

policy.json

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

changedetection_list_watches 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.
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FAQ

Questions about changedetection_list_watches

What does the changedetection_list_watches tool do? +

List all configured watches (URLs being tracked) with their last-check and last-change timestamps. 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 changedetection_list_watches? +

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

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

Can I rate-limit changedetection_list_watches? +

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

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

changedetection_list_watches 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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