update_group

Change a group's name, description, ID number or enrolment key; what isn't given stays. Confirm with the person first.

SERVERMoodle SOURCE@falkenslab/moodle-mcp

Medium RISK CLASS

Category Write

Parameters 51 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/falkenslab-moodle-mcp/update-group.md

WHAT IT DOES

What update_group does on Moodle

AI agents use update_group 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.

Parameter	Type	Required	Description
`name`	string	—
`groupId`	integer	Yes	The group's id, as list_groups gives it
`idNumber`	string	—	An id for external systems
`description`	string	—	HTML
`enrolmentKey`	string	—	A key that enrols students straight into this group with self enrolment

Parameters from the server's own tool schema.

RISK

Why update_group is rated Medium

An AI agent can call update_group faster than any human can review: one bad instruction and it creates or modifies resources in Moodle by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs update_group 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 update_group, this is the rule to start with:

update_group Rate-limited

update_group 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": {
    "update_group": {
      "limits": [
        {
          "counter": "update_group_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about update_group

What does the update_group tool do? +

Change a group's name, description, ID number or enrolment key; what isn't given stays. Confirm with the person first. 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.

What parameters does update_group accept? +

update_group accepts 5 parameters: name, groupId, idNumber, description, enrolmentKey. Required: groupId. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on update_group? +

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

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

Can I rate-limit update_group? +

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

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

update_group 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.

KEEP EXPLORING

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This server

All 233 Moodle tools →

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aroflo_create_or_update_record on AroFlo MCP → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →