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.
This tool retrieves aggregated statistical data about rubric assessments. It does not create, modify, delete, or execute any operations—it only queries and returns information. Even though it accesses student assessment data, the read-only nature and lack of side effects place it firmly in the Read category with low severity, as misuse would only expose information rather than cause operational or financial harm.
From the tool's definition Tool name 'get-rubric-statistics' and description 'Get statistics for rubric assessments on an assignment' indicate data retrieval only. The verb 'Get' and noun 'statistics' confirm a read-only query operation with no modification or side effects.
Attacks that exploit this kind of access
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 (ranver/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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