provider_select · Musubix MCP: Risk & Policy

WHAT IT DOES

What provider_select does on Musubix

AI agents use provider_select to create or update resources in Musubix — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Musubix environment.

WHY IT NEEDS A POLICY

Why provider_select needs a policy

This tool modifies configuration by selecting and setting up an LLM provider. It creates/updates a persistent configuration state, making it a Write operation. Misuse could redirect AI operations to an unintended provider, but it is reversible by reconfiguring.

From the tool's definition 'Select and configure the LLM provider for expert delegation'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

provider_select Rate-limited

provider_select stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "provider_select": {
      "limits": [
        {
          "counter": "provider_select_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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 provider_select

What does the provider_select tool do? +

Select and configure the LLM provider for expert delegation. Currently supports VS Code Language Model API. It is categorised as a Write tool in the Musubix MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on provider_select? +

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

provider_select is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit provider_select? +

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

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

provider_select 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.