crow_send_group_message

Send a message to all members of a contact group. Messages are sent as individual encrypted DMs with group context.

SERVERCrow SOURCEkh0pper/crow

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/kh0pper-crow/crow-send-group-message.md

WHAT IT DOES

What crow_send_group_message does on Crow

AI agents use crow_send_group_message to create or update resources in Crow, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Crow environment.

RISK

Why crow_send_group_message is rated Medium

The tool creates new data (messages) and modifies persistent state by sending communications to multiple recipients. While it affects multiple users, the action is reversible (messages can typically be deleted/unsent in modern systems) and does not permanently destroy data or commit financial obligations.

From the tool's definition Tool description states 'Send a message to all members of a contact group' — this creates new message records and modifies communication state. Messages are persisted ('encrypted DMs'), making this a Write operation that creates data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs crow_send_group_message safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Crow, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For crow_send_group_message, this is the rule to start with:

crow_send_group_message Rate-limited

crow_send_group_message 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.

View as policy code

policy.json

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

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Crow, apply this rule, and every crow_send_group_message call is checked against it from then on.

FAQ

Questions about crow_send_group_message

What does the crow_send_group_message tool do? +

Send a message to all members of a contact group. Messages are sent as individual encrypted DMs with group context. 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_send_group_message? +

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

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

Can I rate-limit crow_send_group_message? +

Yes. Add a rate_limit block to the crow_send_group_message 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_send_group_message completely? +

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

crow_send_group_message 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.

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