myob_raw_prepare_mutation · MYOB Codex MCP: Risk & Policy

WHAT IT DOES

What myob_raw_prepare_mutation does on MYOB Codex MCP

AI agents invoke myob_raw_prepare_mutation to trigger actions in MYOB Codex MCP. 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 myob_raw_prepare_mutation needs a policy

This tool prepares arbitrary POST/PUT/PATCH/DELETE mutations against the MYOB API, covering write, update, and destructive operations. While it stages the request (doesn't execute immediately), it encompasses the full spectrum up to and including DELETE operations.

From the tool's definition Prepare any MYOB POST/PUT/PATCH/DELETE request. This does not call MYOB until approved and committed.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

myob_raw_prepare_mutation Rate-limited

myob_raw_prepare_mutation 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": {
    "myob_raw_prepare_mutation": {
      "limits": [
        {
          "counter": "myob_raw_prepare_mutation_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 MYOB Codex MCP, so you can run agents against it safely.

FAQ

Questions about myob_raw_prepare_mutation

What does the myob_raw_prepare_mutation tool do? +

Prepare any MYOB POST/PUT/PATCH/DELETE request. This does not call MYOB until approved and committed. It is categorised as a Execute tool in the MYOB Codex MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on myob_raw_prepare_mutation? +

Register the MYOB Codex MCP server in PolicyLayer and add a rule for myob_raw_prepare_mutation: 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 MYOB Codex MCP. Nothing to install.

What risk level is myob_raw_prepare_mutation? +

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

Can I rate-limit myob_raw_prepare_mutation? +

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

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

myob_raw_prepare_mutation is provided by the MYOB Codex MCP server (jaeko44/myob-codex-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.