broadcast_message · Agent-Comm-Hub MCP: Risk & Policy

WHAT IT DOES

What broadcast_message does on Agent-Comm-Hub

AI agents use broadcast_message to create or update resources in Agent-Comm-Hub — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Agent-Comm-Hub environment.

WHY IT NEEDS A POLICY

Why broadcast_message needs a policy

Broadcasting messages creates new data artifacts (messages) in the system and modifies communication state across multiple agents. This is a reversible write operation (messages can be archived, acknowledged, or removed). While it affects multiple recipients, it does not execute code, delete data irreversibly, or move financial resources.

From the tool's definition Tool name 'broadcast_message' and description indicate it sends/transmits messages to multiple agents. The description mentions '向多个 Agent 广播消息' (broadcast message to multiple agents) for 'task coordination, status synchronization, emergency notifications.'…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

broadcast_message Rate-limited

broadcast_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": {
    "broadcast_message": {
      "limits": [
        {
          "counter": "broadcast_message_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Agent-Comm-Hub, so you can run agents against it safely.

FAQ

Questions about broadcast_message

What does the broadcast_message tool do? +

向多个 Agent 广播消息，适用于任务协调、状态同步、紧急通知。. It is categorised as a Write tool in the Agent-Comm-Hub MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on broadcast_message? +

Register the Agent-Comm-Hub MCP server in PolicyLayer and add a rule for broadcast_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 Agent-Comm-Hub. Nothing to install.

What risk level is broadcast_message? +

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

Can I rate-limit broadcast_message? +

Yes. Add a rate_limit block to the broadcast_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 broadcast_message completely? +

Set action: deny in the PolicyLayer policy for broadcast_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 broadcast_message? +

broadcast_message is provided by the Agent-Comm-Hub MCP server (liuboacean/agent-comm-hub). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.