expert_ears · Musubix MCP: Risk & Policy

WHAT IT DOES

What expert_ears does on Musubix

AI agents invoke expert_ears to trigger actions in Musubix. 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 expert_ears needs a policy

This tool delegates work to an external expert agent/service to perform requirements analysis and conversion. It triggers an external operation (dispatching to an expert system), which fits the Execute category. It is not purely reading data, as it initiates a process in an external system.

From the tool's definition 'Delegate requirements analysis to the EARS Analyst expert' and 'converting natural language requirements to EARS format'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

expert_ears Rate-limited

expert_ears 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": {
    "expert_ears": {
      "limits": [
        {
          "counter": "expert_ears_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 Musubix, so you can run agents against it safely.

FAQ

Questions about expert_ears

What does the expert_ears tool do? +

Delegate requirements analysis to the EARS Analyst expert. Use for converting natural language requirements to EARS format. It is categorised as a Execute tool in the Musubix MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on expert_ears? +

Register the Musubix MCP server in PolicyLayer and add a rule for expert_ears: 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 Musubix. Nothing to install.

What risk level is expert_ears? +

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

Can I rate-limit expert_ears? +

Yes. Add a rate_limit block to the expert_ears 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 expert_ears completely? +

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

expert_ears is provided by the Musubix MCP server (@nahisaho/musubix-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.