decision_generate_index · Musubix MCP: Risk & Policy

WHAT IT DOES

What decision_generate_index does on Musubix

AI agents use decision_generate_index 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 decision_generate_index needs a policy

This tool modifies an index file, which is a reversible operation (updates can be undone or re-indexed). It does not delete data irreversibly (Destructive), execute arbitrary code (Execute), create financial obligations (Financial), or merely read data (Read). The medium severity reflects that corrupting an index could degrade system functionality but is typically recoverable.

From the tool's definition Tool description states 'Generate or update the ADR index file' — the words 'generate' and 'update' indicate creation or modification of data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

decision_generate_index Rate-limited

decision_generate_index 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": {
    "decision_generate_index": {
      "limits": [
        {
          "counter": "decision_generate_index_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 decision_generate_index

What does the decision_generate_index tool do? +

Generate or update the ADR index file. 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 decision_generate_index? +

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

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

Can I rate-limit decision_generate_index? +

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

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

decision_generate_index 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.