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

Goes beyond the destructiveHint annotation by explaining the downstream consequence: approved timesheets flow toward payroll export. It still does not say whether approval is reversible or requires specific supervisor permissions, but the payroll-flow context is genuinely useful behavior an agent cannot get from the annotations.

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 short sentences plus an endpoint: the purpose is front-loaded, the caveat follows immediately, and nothing is wasted.

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?

Adequate for a single-parameter mutation with a destructive annotation and a stated downstream effect. The only gap is error/response behavior (e.g., what happens if already approved), which is minor given there is no output schema.

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?

Only one parameter (timesheet_id) and schema coverage is 100%, with an inline description; the description adds no format, range, or sourcing detail beyond the schema, so the 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 (approve), a specific resource (one timesheet's times), and the actor role (as a supervisor), which cleanly separates it from the sibling deputy_update_timesheet and the read-only deputy_get_timesheet.

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 an explicit prerequisite/verification step ('check it first with deputy_get_timesheet') and a reason for it, but does not state when approval should be withheld or which alternative to use if the timesheet is wrong.

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