Create a broadcast distribution list and send messages
AI agents use create_broadcast to create or update resources in Mcp Ap2 — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Ap2 environment.
This is a Write operation because it creates a new broadcast distribution list and sends messages, both of which are reversible or have bounded impact. While message sending could reach many users, it is not financial (no money moved), not destructive (distribution lists and messages can be managed/deleted), and not execute-class (no arbitrary code execution).
From the tool's definition The tool description states 'Create a broadcast distribution list and send messages' — it creates a new distribution list (Write) and sends messages to multiple recipients.
Documented attack patterns abuse exactly the kind of access create_broadcast gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for create_broadcast:
{
"version": "1",
"default": "deny",
"tools": {
"create_broadcast": {
"limits": [
{
"counter": "create_broadcast_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_broadcast 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.
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Create a broadcast distribution list and send messages. It is categorised as a Write tool in the Mcp Ap2 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for create_broadcast: 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 Mcp Ap2. Nothing to install.
create_broadcast is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_broadcast 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.
Set action: deny in the PolicyLayer policy for create_broadcast. 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.
create_broadcast is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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