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

Annotations only declare readOnlyHint, so the description carries the rest and does well: nulls appear for unstored days, the range is capped at 93 days, and days are interpreted in the company timezone with an exclusive `to`. It does not mention auth requirements or error behavior when the cap is exceeded.

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?

Front-loads what is returned before the range constraints, with no filler. The semicolon-joined fragment style and shorthand like 'max93days' are dense but readable; a little more structure would help.

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 enough: it names the returned fields, warns that array entries may be null, and constrains the range. The per-day object shape and the failure mode when the 93-day cap is exceeded are the remaining gaps.

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 33%, so the description must compensate, and it does for `from`/`to`: inclusive start, exclusive end, company-zone days, and the 93-day max. `departmentID` is left to the schema's own description, which is acceptable since that field is documented there.

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 (read) and the exact resource contents (stored daily notes, manual revenue, extra labor, targets) over a day range. It clearly distinguishes itself from the calculated-totals sibling get_department_stats, though it does not mention the single-day sibling workfeed_get_department_day.

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?

Explicitly routes calculated labor totals to get_department_stats, giving a clear when-not-to-use-this signal. It does not say when to prefer the single-day get_department_day, but the range semantics make the split largely implicit.

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