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

Annotations already declare readOnlyHint=false, idempotentHint=false, destructiveHint=false, so the description need not restate the safety profile. It does add genuinely new operational context: the 30-requests-per-hour per-API-key rate limit and the underlying endpoint POST /v1/categories/category.json. No contradiction with the annotations.

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?

Three short sentences, front-loaded with the 'WRITE:' marker, then the return value, then the operational limits. Every sentence carries distinct information with no padding.

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 mutation with full schema coverage and annotations, the description fills the main gaps: it discloses the return value (category_id) in the absence of an output schema, plus rate limits. It stops short of describing failure modes, such as what happens if parent_category_id does not exist.

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 100% – both parameters carry their own descriptions, including the useful pointer that parent_category_id comes from classmarker_list_categories. The description adds no syntax, format, or validation detail beyond that, so the baseline 3 applies.

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 and resource ('create a question category') and adds scope ('under a parent category'), which implicitly separates it from the sibling classmarker_create_parent_category. An agent can pick between the two category-creation tools without opening either schema.

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 'WRITE:' prefix signals this is a mutating operation, and 'under a parent category' implies a parent must already exist, but the description never states when to prefer this over classmarker_create_parent_category or classmarker_update_category, nor any preconditions. Usage is inferable rather than guided.

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