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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the safety profile is covered. The description adds real behavioral context beyond that: it discloses the entry's post-state (returned to submitter for correction) and the timeTracking PRO+ feature gate, which the annotations do not.

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 fragments, front-loaded with the action and its state precondition, with no filler. The feature/PRO+ note earns its place as a gating constraint, though it sits slightly awkwardly as a trailing tag.

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-entity mutation whose annotations carry the destructive/idempotent profile and which has no output schema, the description covers action, precondition, effect, optional parameter, and feature gate. It omits what happens on a non-SUBMITTED entry and any permission/approver requirement, which are minor 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 50%: 'reason' is documented in the schema, but 'entryId' has no description anywhere. The description adds only that reason is optional and 'shown to submitter' behavior already lives in the schema, so it neither compensates for nor extends the undocumented entryId.

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 precise verb+resource (reject a timesheet entry) and scopes it with 'single SUBMITTED', which separates it from the sibling reject_timesheet_week and from update_timesheet_entry. An agent can tell what it does without opening the schema.

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 'SUBMITTED' precondition and the parenthetical effect ('returns it to the submitter for correction') imply when the tool applies, but no alternative is named — not approve_timesheet_entry, not reject_timesheet_week, not update_timesheet_entry. Usage is inferable rather than stated.

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