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

Without annotations, the description discloses key behaviors: the effect (period and time reports transition to Approved) and the preview-vs-execution mode via the confirm flag. It also mentions role restrictions, but does not discuss reversibility or potential failures. This provides solid transparency for the tool's operation.

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 description is extremely concise: two sentences that front-load the core action and effect, then provide the confirmation signal and role requirement. No redundant words or sentences.

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?

Given the lack of annotations and output schema, the description covers the core aspects: action, confirmation pattern, role constraint, and parameter sources. It does not detail error conditions or post-approval state transitions, but these are implicitly covered by the description's clarity.

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%, and the description adds meaning beyond the schema by explaining the confirm flag's preview behavior and the source for submission_period_id. The idempotency_key is described in the schema but not elaborated in the description, which is acceptable as the schema covers it.

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?

The description uses a specific verb 'Approve' and resource 'submitted timesheet period', clearly differentiating it from sibling tools like reject_timesheet, recall_timesheet, and reopen_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?

The description explains when to use the tool (to approve a submitted timesheet), how to confirm the action with confirm=true, and the required role (Manager or Admin/Owner, excluding Finance). It could further clarify when not to use it in favor of alternatives like reject, but the guidelines are clear and actionable.

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