moleculer_call_action · Moleculer MCP Server MCP

WHAT IT DOES

What moleculer_call_action does on Moleculer MCP Server

AI agents invoke moleculer_call_action 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_call_action needs a policy

Calling a Moleculer action executes arbitrary microservice logic whose effects are entirely dependent on the action invoked. Since the tool provides a generic interface to call any action across the microservice network, it could trigger reads, writes, destructive operations, or financial transactions depending on what actions are registered.

From the tool's definition "Call a Moleculer action" — triggers execution of arbitrary Moleculer microservice actions

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

moleculer_call_action Rate-limited

moleculer_call_action 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_call_action": {
      "limits": [
        {
          "counter": "moleculer_call_action_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_call_action

What does the moleculer_call_action tool do? +

Call a Moleculer action. 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_call_action? +

Register the Moleculer MCP Server MCP server in PolicyLayer and add a rule for moleculer_call_action: 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_call_action? +

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

Can I rate-limit moleculer_call_action? +

Yes. Add a rate_limit block to the moleculer_call_action 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_call_action completely? +

Set action: deny in the PolicyLayer policy for moleculer_call_action. 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_call_action? +

moleculer_call_action 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.