vaultwarden_user_count

THE RISK

Low Risk

Why vaultwarden_user_count needs a policy

This tool queries Vaultwarden admin API to retrieve a count of registered users—a non-sensitive aggregate statistic. It performs no data modification, deletion, or execution of external operations. The requirement for admin token is a security gate, not a category escalator. The blast radius of misuse is minimal: an attacker gains knowledge of user population size, which is low-impact information disclosure.

From the tool's definition Tool name 'vaultwarden_user_count' and description 'Return the number of registered Vaultwarden users' indicates a retrieval operation.

Risk signalsAdmin/system-level operation

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

POLICY

How to control vaultwarden_user_count

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 vaultwarden_user_count:

policy.json

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

vaultwarden_user_count 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.
MCP token cost → What connecting this server costs in context-window tokens on every request.
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FAQ

Questions about vaultwarden_user_count

What does the vaultwarden_user_count tool do? +

Return the number of registered Vaultwarden users. Requires a valid VAULTWARDEN_ADMIN_TOKEN — the admin API does not expose passwords, only account metadata. 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 vaultwarden_user_count? +

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

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

Can I rate-limit vaultwarden_user_count? +

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

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

vaultwarden_user_count 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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