crow_voice_memo

THE RISK

Medium Risk

Why crow_voice_memo needs a policy

The tool creates and transmits a new message artifact (voice memo) within the Crow system. This is a Write operation (reversible modification/creation of data) rather than Read (no data retrieval), Execute (no code execution), Destructive (reversible), Financial (no money movement), or Other.

From the tool's definition Tool description states 'Send a text voice memo to a Crow contact' — this is a write operation that creates/sends new data (a voice memo message) to another user.

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

POLICY

How to control crow_voice_memo

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_voice_memo:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "crow_voice_memo": {
      "limits": [
        {
          "counter": "crow_voice_memo_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

crow_voice_memo stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about crow_voice_memo

What does the crow_voice_memo tool do? +

Send a text voice memo to a Crow contact. The recipient. It is categorised as a Write tool in the Crow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on crow_voice_memo? +

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

crow_voice_memo is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit crow_voice_memo? +

Yes. Add a rate_limit block to the crow_voice_memo 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_voice_memo completely? +

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

crow_voice_memo 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 →