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

The annotations already indicate mutation is expected (readOnlyHint=false) and idempotency is supported. The description adds useful behavioral context: it saves exactly one answer, returns feedback plus one adaptive next question, and accepts multiple answer formats. This goes beyond the annotations without contradicting them.

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 tightly written sentences front-load the core action and result, then add input-format and batching constraints. There is no redundant or filler content.

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 one-shot diagnostic answer submission, the description covers what is saved, what is returned, accepted input forms, and the per-call limit. Combined with the schema descriptions for requestId and intent, the tool definition is complete enough for an agent to select and invoke 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 40%, so the description partially compensates by clarifying the answer parameter can be an option letter, full text, or answer id. The remaining parameters (sessionToken, questionId) are self-explanatory or already described in the schema, and the 'one question per call' note adds scope clarity.

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 states a specific action ('Saves one answer'), names the exact resource ('active Fiveable diagnostic'), and describes the return behavior ('feedback plus exactly one next adaptive question'). This clearly distinguishes the tool from sibling tools like submit_practice_answer and check_practice_answer.

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?

The description gives clear context for when this tool is appropriate: answering the current question in the student's active diagnostic. It emphasizes 'one question per call' and the diagnostic-specific scope, though it does not explicitly name alternatives or state when not to use it.

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