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

Annotations only declare readOnlyHint=true; the description adds real behavioral context beyond that: the default response is a compact record, sensitive data is never returned, and bank/insurance/tax/salary/ID-document data is unavailable. It does not say what happens when the id is not found, which is the main remaining gap.

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 verb and resource, then the return-shape expectation, then the data restriction. Nothing is wasted or buried.

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?

With no output schema, the description does the necessary work of setting return-shape expectations (compact by default, expand via `fields`) and ruling out sensitive data. Error behavior for a missing id is the only meaningful omission for a read-only two-parameter tool.

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 coverage is 100%, so both `id` and `fields` are fully documented in the schema, including the enum and the never-available categories. The description's 'compact record' framing and field examples largely restate the schema description, so it sits at the baseline rather than adding much new meaning.

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: 'Get one employee by id', which is clearly a single-record fetch and implicitly contrasts with the list siblings. It does not explicitly name smarthr_list_employees as the alternative, so differentiation is only implied by 'one ... by id'.

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?

It tells the agent to use `fields` when address, phone, birth date, custom fields or contract dates are needed, which is useful in-call guidance. However, there is no explicit when-to-use-this-vs-alternatives statement (e.g. versus smarthr_list_employees or smarthr_list_users), leaving the routing to inference.

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