births_on_this_day

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It usefully discloses the data source (Wikipedia 'On This Day'), the temporal scope (today's date, UTC), and the content type (notable births). However, it does not mention behavior around empty results, count handling beyond the schema, or whether the API always uses the current date rather than a user-supplied date.

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 front-loaded with the core action and scope, followed by relevant use cases and sibling integration. It is slightly generous with marketing-style phrases, but each sentence earns its place by clarifying purpose or usage.

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?

Given the tool's low complexity, two optional parameters, and 100% schema coverage, the description is largely complete. It explains source, scope, use cases, and relationship to siblings. The lack of an output schema means return shape is not specified, but 'notable births' plus a count parameter gives enough context for most agents to infer a list of birth entries.

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%, so both parameters (lang and count) are already fully documented with defaults and constraints. The description adds no additional parameter-level meaning beyond the overall resource context, so the baseline score of 3 is appropriate.

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 opens with a specific verb and resource: 'Get notable births that happened on today's date (UTC) from Wikipedia's On This Day feed.' It also explicitly differentiates this tool from its siblings by calling it the 'births companion' to on_this_day (events) and deaths_on_this_day (deaths), so an agent can immediately understand its unique role.

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 names the sibling tools and clarifies which one handles births vs events vs deaths, giving clear selection context. It also provides concrete use cases like birthday round-ups and newsletter intros, though it does not explicitly state when not to use this tool or list exclusion criteria.

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