dar_baja · Moodle MCP: Risk & Policy

WHAT IT DOES

What dar_baja does on Moodle

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

WHY IT NEEDS A POLICY

Why dar_baja needs a policy

The tool modifies course enrollment status for users, which is a Write operation as it changes data state reversibly. While unenrollment could be sensitive in an educational context, it is explicitly non-destructive and can be reversed by re-enrolling users.

From the tool's definition Tool description states it 'Unenrol one or more users from a course' and explicitly notes 'user data is preserved, only the course enrolment link is removed.' This is a reversible modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

dar_baja Rate-limited

dar_baja 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": {
    "dar_baja": {
      "limits": [
        {
          "counter": "dar_baja_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 Moodle, so you can run agents against it safely.

FAQ

Questions about dar_baja

What does the dar_baja tool do? +

Unenrol one or more users from a course. Non-destructive: user data is preserved, only the course enrolment link is removed. It is categorised as a Write tool in the Moodle MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on dar_baja? +

Register the Moodle MCP server in PolicyLayer and add a rule for dar_baja: 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 Moodle. Nothing to install.

What risk level is dar_baja? +

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

Can I rate-limit dar_baja? +

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

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

dar_baja is provided by the Moodle MCP server (marcosnahuel/moodle-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.