Get statistics for rubric assessments on an assignment
AI agents call get-rubric-statistics to retrieve information from Canvas MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves aggregate statistics about existing rubric assessments. It has no side effects, does not modify data, and does not execute code or trigger external operations. This is a read-only operation characteristic of data retrieval tools. Severity is low because viewing statistics on assignment rubrics poses minimal security risk even if an AI agent misuses it — it only exposes educational data visibility.
From the tool's definition Tool name and description: 'Get statistics for rubric assessments on an assignment' — this is a retrieval operation that queries and returns data without modifying, deleting, or executing external operations.
Documented attack patterns abuse exactly the kind of access get-rubric-statistics gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Canvas MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get-rubric-statistics:
{
"version": "1",
"default": "deny",
"tools": {
"get-rubric-statistics": {}
}
}get-rubric-statistics is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get statistics for rubric assessments on an assignment. It is categorised as a Read tool in the Canvas MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Canvas MCP Server MCP server in PolicyLayer and add a rule for get-rubric-statistics: 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 Canvas MCP Server. Nothing to install.
get-rubric-statistics 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 get-rubric-statistics 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 get-rubric-statistics. 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.
get-rubric-statistics is provided by the Canvas MCP Server MCP server (r-huijts/canvas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Canvas MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
50 Canvas MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.