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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds the meaningful behavioral detail that the result set is company-wide by default (all employees, optionally including deactivated ones), which matters for volume. It says nothing about pagination, row caps, or cost of a full-company date range query.

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 dense sentences front-load the core capability and then the optional filters, with no filler. The trailing 'GraphQL query attendanceStatements' is implementation metadata of limited value to an agent but takes only a few words.

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?

There is no output schema, and the description compensates well by enumerating the metric families returned (expected vs tracked time, time off, holidays, balance, overtime, per-project tracked time). The main remaining gap is result-set size and pagination behavior for a required date-range query over all employees.

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 86%, so the schema already documents date_from/date_to, project_id, has_uncategorized_time and include_inactive_users. The description restates the filter semantics rather than adding constraints, and the two enum parameters (sort_by, sort_direction) receive no mention in either place beyond the enum values.

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 ('Attendance summaries of ALL employees over a date range') and enumerates the returned metrics, which distinguishes it from the singular kiwihr_get_attendance_statement by its 'ALL employees' scope. The sibling distinction is only implied by capitalizing ALL rather than named explicitly.

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 explains what the optional filters do ('only employees with time tracked on a project, or with uncategorized time; inactive employees can be included'), which implies when those filters apply. It never states when to prefer this over kiwihr_get_attendance_statement for a single employee, nor any prerequisites or limits.

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