AI agents use matricular_csv 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.
matricular_csv is a Write operation—it creates new user accounts and modifies course enrollment, both of which are data mutations. While reversible (unlike Destructive actions), this tool has high severity because: (1) bulk operations on enrollment carry wide blast radius if misused (many users affected), (2) automated user account creation with temporary passwords has account-security implications, and (3)…
From the tool's definition Tool performs batch user enrollment ('Batch-enrol users'), creates missing users ('Creates missing users'), and generates credentials ('random temp password'). These are persistent, reversible modifications to course enrollment and user records.
Attacks that exploit this kind of access
Batch-enrol users in a course from a CSV (email,firstname,lastname[,role]). Creates missing users by default with a random temp password. Returns per-row status. 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.
Register the Moodle MCP server in PolicyLayer and add a rule for matricular_csv: 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.
matricular_csv is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the matricular_csv 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 matricular_csv. 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.
matricular_csv 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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