get_categories

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

Without annotations, the description carries the full burden. It discloses the primary behavior (returning categories and counts) and the default date behavior, but it does not state whether the operation is read-only, mention permission requirements, or describe error conditions. This is adequate for a simple getter but lacks richer behavioral context.

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 description is extremely concise, with a one-sentence purpose followed by a clear parameter specification. Every part contributes meaning, and the most important information is front-loaded.

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-parameter tool with no output schema, the description covers the essential behavior and parameter semantics. It clearly conveys the return concept ('categories and their article counts') and the default behavior. It doesn't detail ordering, pagination, or error handling, but for this simplicity level it is sufficiently complete.

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 input schema provides only the type and default for 'date' (string|null, default null), with no description. The description compensates by specifying 'Target date in YYYY-MM-DD format (optional, defaults to today)', adding meaning and format guidance beyond the schema.

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 clearly states what the tool does: 'Get all categories and their article counts for a specific date.' This is a specific verb+resource+scope combination, and it distinguishes itself from sibling tools by focusing on categories and counts rather than articles or article groups.

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 provides no guidance on when to use this tool versus its siblings (e.g., get_articles_by_date, get_article_groups). It does not mention alternatives or exclude contexts, so the agent is left without contextual usage direction.

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