list_scales

List the scales a course's grades can use: its own and the site's standard ones, with their values and whether something grades with them.

SERVERMoodle SOURCE@falkenslab/moodle-mcp

Low RISK CLASS

Category Read

Parameters 11 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/falkenslab-moodle-mcp/list-scales.md

WHAT IT DOES

What list_scales does on Moodle

AI agents call list_scales to retrieve information from Moodle without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`courseId`	integer	Yes

Parameters from the server's own tool schema.

RISK

Why list_scales is rated Low

Even though list_scales only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_scales safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Moodle, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_scales, this is the rule to start with:

list_scales Allowed

list_scales is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_scales": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Moodle, apply this rule, and every list_scales call is checked against it from then on.

FAQ

Questions about list_scales

What does the list_scales tool do? +

List the scales a course's grades can use: its own and the site's standard ones, with their values and whether something grades with them. It is categorised as a Read tool in the Moodle MCP Server, which means it retrieves data without modifying state.

What parameters does list_scales accept? +

list_scales accepts 1 parameter: courseId. Required: courseId. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on list_scales? +

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

list_scales is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_scales? +

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

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

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

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