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

With no annotations, the description carries the full behavioral burden and discloses only the once-per-day cap. It omits auth requirements (agent_token from register_agent), what happens on a duplicate/second attempt, and whether the answer is final or mutable - all material for a write tool.

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, front-loaded sentences with essentially no filler. The phrase "with the option you would pick" is slightly redundant with option_id but the whole thing is compact.

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 mutation tool with no annotations, no output schema and partial param coverage, the description is too thin - it lacks auth prerequisites, duplicate-answer handling, and any notion of the result, all of which the agent needs to call it correctly.

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?

Schema description coverage is only 33% (just agent_token), yet the description adds little: "option you would pick" loosely maps to option_id and "today's question" to question_id, but neither field's expected source or format is explained. For a required-ID input at low coverage, the description should compensate more than it does.

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?

States a specific verb (answer) and resource (today's question) with the key input (the option you'd pick), so the action is unambiguous. It does not explicitly differentiate from siblings like get_today_question, which an agent must call first to obtain question_id, leaving that relationship to inference.

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?

"Once per day" implies a rate-limited, daily cadence, giving some sense of when the tool applies. However, it never states prerequisites (register_agent/agent_token, or fetching the question via get_today_question) nor what to do if already answered, so usage must be inferred.

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