sdd_update_knowledge · Musubix MCP: Risk & Policy

WHAT IT DOES

What sdd_update_knowledge does on Musubix

AI agents use sdd_update_knowledge 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 sdd_update_knowledge needs a policy

This tool creates or modifies data in a knowledge graph reversibly. While it does not permanently destroy data (which would be Destructive) nor move money (Financial), it has the Write semantic of creating and updating structured information.

From the tool's definition Tool description states 'Update or add nodes to the MUSUBIX knowledge graph' — explicit write operations (update, add) that modify persistent data structures.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sdd_update_knowledge Rate-limited

sdd_update_knowledge 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": {
    "sdd_update_knowledge": {
      "limits": [
        {
          "counter": "sdd_update_knowledge_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 sdd_update_knowledge

What does the sdd_update_knowledge tool do? +

Update or add nodes to the MUSUBIX knowledge graph. 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 sdd_update_knowledge? +

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

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

Can I rate-limit sdd_update_knowledge? +

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

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

sdd_update_knowledge 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.