ops_broadcast_message · Slack Max API MCP: Risk & Policy

WHAT IT DOES

What ops_broadcast_message does on Slack Max API MCP

AI agents use ops_broadcast_message to create or update resources in Slack Max API MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Slack Max API MCP environment.

WHY IT NEEDS A POLICY

Why ops_broadcast_message needs a policy

The tool creates new message content across multiple channels, which is a write operation that modifies the state of the Slack workspace. The blast radius is high because a compromised AI agent could spam or distribute misleading operational messages to many channels simultaneously, disrupting communication and potentially causing business impact through misinformation.

From the tool's definition Tool description states it will 'Broadcast the same operational message to multiple channels', which creates and distributes messages across the workspace. This is a write operation that modifies Slack by adding new messages.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ops_broadcast_message Rate-limited

ops_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": {
    "ops_broadcast_message": {
      "limits": [
        {
          "counter": "ops_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 Slack Max API MCP, so you can run agents against it safely.

FAQ

Questions about ops_broadcast_message

What does the ops_broadcast_message tool do? +

Broadcast the same operational message to multiple channels, or send a prepared broadcast draft. It is categorised as a Write tool in the Slack Max API MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on ops_broadcast_message? +

Register the Slack Max API MCP server in PolicyLayer and add a rule for ops_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 Slack Max API MCP. Nothing to install.

What risk level is ops_broadcast_message? +

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

Can I rate-limit ops_broadcast_message? +

Yes. Add a rate_limit block to the ops_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 ops_broadcast_message completely? +

Set action: deny in the PolicyLayer policy for ops_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 ops_broadcast_message? +

ops_broadcast_message is provided by the Slack Max API MCP server (jeongwoobin335/slack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.