analytics_period_categories_distinct

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

Annotations already provide readOnlyHint=true and openWorldHint=true. Description adds no further behavioral details (e.g., no mention of result format or error handling). But it is consistent and does not contradict 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?

Very concise, front-loaded with purpose, then usage guidance, then trigger words. No wasted sentences.

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 simple list tool with one parameter and no output schema, the description covers prerequisite, use cases, and trigger words. Lacks return format details but still adequate given context signals.

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 only parameter 'period' is required with minLength:1 but no description in schema (0% coverage). Description mentions period only in the prerequisite context without clarifying format, expected values, or examples. Fails to compensate for missing schema documentation.

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 'List distinct categories in a statement period', specifying a verb, resource, and scope. It distinguishes from siblings like analytics_categories_distinct_global (global scope) and analytics_period_categories (likely more detailed listing).

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?

Provides explicit prerequisite (call analytics_periods_list first) and when to use ('discover which categories exist in one statement period'). Includes trigger words. Does not explicitly exclude use cases for siblings but is clear enough.

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