Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered by structured data. The description adds one genuinely useful behavioral constraint — that the reply/answering workflow lives in the app rather than through an MCP tool — but says nothing about ordering, volume, or what a cancellation request record contains.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two short fragments, no filler, with the read-only constraint front-loaded in the second clause. The telegraphic style is efficient but borders on under-specification, which keeps it just below a 5.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a no-parameter, no-output-schema read tool, the description supplies the minimum an agent needs to pick the tool. It stops short of saying what the returned requests look like (student, plan, reason, date) or roughly how many, leaving a gap that would help an agent decide whether to call it.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline of 4 applies. The description does not introduce any misleading parameter expectations.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description identifies the resource as 'Students asking to cancel a plan,' which narrows it against sibling lists such as list_join_requests or list_class_change_requests. However, it omits an explicit verb (the action is only implied by the name) and never specifies which plan type is being cancelled, so the agent must infer the listing behavior.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

'Read only: answering stays in the app' gives a partial when-not signal by telling the agent that responses cannot be sent through this tool. There is no explicit guidance on when to select this over the many adjacent list_* request tools, and no named alternative for acting on a request.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.