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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds real value beyond that by specifying which fields are returned ('expected birth, leave start/end and scheduled return dates') and explicitly stating that bank, insurance and memo data are excluded, which prevents the agent from over-claiming results.

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?

Two tight sentences, zero filler: the first front-loads what the tool returns and for what scope, the second disambiguates excluded fields. Nothing here is redundant or padded.

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 paginated read-only list with no output schema, the description covers returned fields, excluded data, and scope, and pagination is handled by the schema. A brief note on ordering or empty-result behavior would make it fully complete, but nothing an agent needs to call it correctly is missing.

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 page, per_page and employee_id are fully documented in the schema. The description only reinforces that the call is scoped to a single employee; it adds no syntax or format detail beyond the schema, so 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 ('List the maternity and childcare leave records'), names the scope (one employee), and enumerates the returned fields. No sibling covers the same resource, so no sibling differentiation is needed, but the description doesn't spell out how it relates to other employee sub-resource listers.

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?

Usage is only implied: the phrase 'of one employee' signals this is a per-employee lookup requiring employee_id, but there is no explicit when-to-use or prerequisite statement. No alternatives are named, which is acceptable given no sibling overlaps, but no positive guidance is given either.

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