cambiar_rol · Moodle MCP: Risk & Policy

WHAT IT DOES

What cambiar_rol does on Moodle

AI agents use cambiar_rol 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 cambiar_rol needs a policy

The tool explicitly assigns roles to users, which modifies access control and permissions in the Moodle learning management system. This is a Write operation because it creates/modifies authorization data reversibly—role assignments can be unassigned.

From the tool's definition Assign a course-level role to a user (student / teacher / editingteacher / manager). This creates a new role assignment that modifies user permissions within a course context.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cambiar_rol Rate-limited

cambiar_rol 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": {
    "cambiar_rol": {
      "limits": [
        {
          "counter": "cambiar_rol_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 cambiar_rol

What does the cambiar_rol tool do? +

Assign a course-level role to a user (student / teacher / editingteacher / manager). Does NOT unassign previous roles — Moodle supports multiple roles per user per context. 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 cambiar_rol? +

Register the Moodle MCP server in PolicyLayer and add a rule for cambiar_rol: 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 cambiar_rol? +

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

Can I rate-limit cambiar_rol? +

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

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

cambiar_rol 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.