emit-event · Claude Flow MCP: Risk & Policy

WHAT IT DOES

What emit-event does on Claude Flow

AI agents invoke emit-event to trigger actions in Claude Flow. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why emit-event needs a policy

Emitting events is a side-effecting operation that triggers execution in one or more subscribers. The actual blast radius depends on what those subscribers do, which could range from benign logging to spawning agents or modifying state. Given the context of an AI orchestration platform with agent swarms, misuse could cascade into significant unintended operations.

From the tool's definition 'Emit an event to subscribers' — triggers an external operation (event dispatch) whose downstream effects depend on what subscribers are registered and what actions they take.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

emit-event Rate-limited

emit-event stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "emit-event": {
      "limits": [
        {
          "counter": "emit-event_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about emit-event

What does the emit-event tool do? +

Emit an event to subscribers. It is categorised as a Execute tool in the Claude Flow MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on emit-event? +

Register the Claude Flow MCP server in PolicyLayer and add a rule for emit-event: 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 Claude Flow. Nothing to install.

What risk level is emit-event? +

emit-event is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit emit-event? +

Yes. Add a rate_limit block to the emit-event 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 emit-event completely? +

Set action: deny in the PolicyLayer policy for emit-event. 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 emit-event? +

emit-event is provided by the Claude Flow MCP server (claude-flow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.