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

Annotations already declare readOnly/idempotent/non-destructive, so the safety bar is met. The description adds genuinely useful behavior beyond that: the authorization model (managers-mode OWNER/ADMIN/MANAGER vs approvers-mode explicit list), GUEST exclusion, and the return shape (rows plus KPI summary for the Approvals inbox).

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?

Three tight sentences, front-loaded with the purpose before the parenthetical auth constraints. Dense with parentheticals but no wasted sentences; each clause carries a constraint.

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 single-param read tool with full annotation coverage, the definition supplies what's needed: authorization gating, week semantics, and a sketch of the return payload. No output schema exists, but the description partially covers what comes back, so the gap is minor.

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 100%, so the single parameter is fully documented in the schema. The description restates the YYYY-MM-DD format and Monday-of-week semantics rather than adding new meaning. 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+resource+scope: 'Per-user timesheet submission state for one week'. An agent knows exactly what it retrieves. It does not, however, differentiate itself from the very similar sibling weekly_compliance, so the reader must infer the boundary.

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 real usage context (approver-only, mode-specific role gating, GUESTs excluded), which tells the agent whether it is even allowed to call it. But it names no alternative and no condition for choosing this over weekly_compliance or list_timesheet_entries, so the sibling boundary is left implicit.

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