expert_security · Musubix MCP: Risk & Policy

WHAT IT DOES

What expert_security does on Musubix

AI agents invoke expert_security 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_security needs a policy

This tool delegates tasks to an external expert agent, triggering external operations (security analysis, code review, threat modeling). It executes analysis workflows on potentially sensitive code/systems. The blast radius is high since misuse could expose vulnerabilities or sensitive security information to unintended parties, and it involves executing agent-based operations rather than simple reads.

From the tool's definition "Delegate security analysis to the Security Analyst expert" and "vulnerability detection, security code review, and threat modeling"

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

expert_security Rate-limited

expert_security 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_security": {
      "limits": [
        {
          "counter": "expert_security_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_security

What does the expert_security tool do? +

Delegate security analysis to the Security Analyst expert. Use for vulnerability detection, security code review, and threat modeling. 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_security? +

Register the Musubix MCP server in PolicyLayer and add a rule for expert_security: 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_security? +

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

Can I rate-limit expert_security? +

Yes. Add a rate_limit block to the expert_security 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_security completely? +

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

expert_security 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.