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

Goes well beyond the destructiveHint/idempotentHint annotations by spelling out exactly which data is destroyed, that the action is irreversible, that the exam date and account survive, and that each call appends a usage record so repeats erase nothing further. That last point concretely reinforces the idempotency claim rather than restating it.

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?

The irreversible effect is front-loaded in the first clause, followed by scope, preconditions, and side effects in descending priority. No sentence is redundant; even the closing note about usage records carries behavioral information.

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 two-parameter destructive tool with no output schema, the definition covers scope, irreversibility, consent, and repeat-call behavior adequately. Only the shape of the response after a reset is unaddressed, a minor gap given the action's terminal nature.

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 coverage is already 100%, including the exam id format and the save_study_settings default, so the baseline is 3. The description still adds value by interpreting confirm as evidence of explicit user consent and grade selection, which is a semantic requirement the schema phrase alone only partly conveys.

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?

Names a specific verb and object ('Permanently erase the learner's progress for one exam (grade)') and enumerates exactly what is removed: recorded answers, mastery per topic, review schedule, and timed set results. This is clearly distinguishable from read-oriented siblings such as get_progress.

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?

Gives an explicit precondition for use: the user must have explicitly asked to reset and confirmed which grade, enforced via confirm: true. It also bounds scope ('Other grades are not touched') and explains the default when exam is omitted. It does not name a sibling alternative for viewing progress instead, so it stops just short of a 5.

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