moleculer_emit_event · Moleculer MCP Server MCP

WHAT IT DOES

What moleculer_emit_event does on Moleculer MCP Server

AI agents invoke moleculer_emit_event to trigger actions in Moleculer MCP Server. 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 moleculer_emit_event needs a policy

Emitting an event in a microservices architecture triggers external operations across potentially many services. The effects depend entirely on what event handlers are registered, which could include writes, deletes, financial operations, or other side effects. This is Execute at minimum, with high severity due to the broad and unpredictable blast radius of event-driven side effects across microservices.

From the tool's definition "Emit a Moleculer event" — triggers an event in the Moleculer microservices bus, which can invoke arbitrary downstream service handlers

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

moleculer_emit_event Rate-limited

moleculer_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": {
    "moleculer_emit_event": {
      "limits": [
        {
          "counter": "moleculer_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 Moleculer MCP Server, so you can run agents against it safely.

FAQ

Questions about moleculer_emit_event

What does the moleculer_emit_event tool do? +

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

How do I enforce a policy on moleculer_emit_event? +

Register the Moleculer MCP Server MCP server in PolicyLayer and add a rule for moleculer_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 Moleculer MCP Server. Nothing to install.

What risk level is moleculer_emit_event? +

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

Can I rate-limit moleculer_emit_event? +

Yes. Add a rate_limit block to the moleculer_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 moleculer_emit_event completely? +

Set action: deny in the PolicyLayer policy for moleculer_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 moleculer_emit_event? +

moleculer_emit_event is provided by the Moleculer MCP Server MCP server (moleculerjs/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.