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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true, so the safety profile is carried by structured data. The description still adds real value by disclosing company rounding rules and that the reply echoes the times actually registered, but it could say more about what happens to conflicting or duplicate entries beyond "not undone by repeating it".

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 verb and write nature are front-loaded, and almost every clause carries information an agent needs. It is a single dense paragraph though, and the key-sourcing plus break-pairing rules would scan faster as separate sentences or bullets.

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 destructive, non-idempotent mutation with no output schema, the definition covers prerequisites, ordering, break pairing, rounding behavior, the shape of the reply, and the wage impact plus a confirm-first warning. An agent has everything needed to call it correctly.

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 the baseline is 3, and the description goes beyond it: it explains that department_key/employee_key are POS keys with a specific configuration origin, that each entry needs EITHER check_in_time OR check_out_time, and that a shared activity_name on a pair brackets a break. That is genuine semantics the schema does not express.

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?

Opens with an explicit "WRITE:" marker and states the precise resource (check-in/check-out times in the Tamigo timesheet) and scope (one or many employees). It also notes it is the same call a POS system makes, which immediately separates it from every read-only sibling such as tamigo_list_shifts or tamigo_list_absences.

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?

Gives concrete preconditions (POS keys configured under Configuration -> Departments / POS Keys) and names the two sibling tools that supply those keys, tamigo_list_departments and tamigo_list_employees. It also states ordering requirements, how to register a break, and advises confirming entries first.

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