list_participants
List a course's participants with their roles and groups, as the participants page does: people as aliases when the server pseudonymizes, never emails or profile fields. Filter by role, group, or those who haven't accessed the course since a date (inactiveSince). A page at a time: limit participa...
This record as markdown: /tools/falkenslab-moodle-mcp/list-participants.md
What list_participants does on Moodle
AI agents call list_participants 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 |
|---|---|---|---|
role | integer | — | Only this role's, by its id (as the participants' roles give it) |
group | integer | — | Only this group's members, by its id from list_groups |
limit | integer | — | How many participants (50 by default, up to 500) |
offset | integer | — | How many participants to skip first (0 by default) |
courseId | integer | Yes | |
inactiveSince | string | — | Only those who haven't accessed the course since this date (ISO 8601) |
Parameters from the server's own tool schema.
Why list_participants is rated Low
Even though list_participants 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
The rule that runs list_participants 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_participants, this is the rule to start with:
list_participants is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Moodle, apply this rule, and every list_participants call is checked against it from then on.
Questions about list_participants
List a course's participants with their roles and groups, as the participants page does: people as aliases when the server pseudonymizes, never emails or profile fields. Filter by role, group, or those who haven't accessed the course since a date (inactiveSince). A page at a time: limit participants (50 by default) after skipping offset; more says whether there are others. It is categorised as a Read tool in the Moodle MCP Server, which means it retrieves data without modifying state.
list_participants accepts 6 parameters: role, group, limit, offset, courseId, inactiveSince. Required: courseId. The full parameter table on this page comes from the server's own tool schema.
Register the Moodle MCP server in PolicyLayer and add a rule for list_participants: 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.
list_participants is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_participants 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.
Set action: deny in the PolicyLayer policy for list_participants. 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.
list_participants 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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