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

With no annotations, the description carries the full behavioral burden and does so well: it discloses the role-based authorization model and the safety gate that a preview is returned unless confirm=true. It omits reversibility/soft-delete behavior and what the preview contains, keeping it out of the 5 tier.

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 short sentences, zero filler, with the core action front-loaded and the safety/permission caveats following in priority order. Every sentence earns its place.

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 tool with no annotations and no output schema, the description supplies the critical missing context: permissions and the preview-before-write behavior. It could still say whether deletion is reversible or what the preview returns, but it is largely complete.

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 all three parameters (confirm, time_report_id, idempotency_key) are already documented in the schema. The description only restates the confirm=true gate and adds no syntax or format detail beyond it; baseline 3 is appropriate.

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 (Delete) and resource (a time report entry), which cleanly separates it from sibling mutations like delete_draft_invoice, delete_task, or permanent_delete_entity. It does not, however, explicitly name any sibling or scope boundary, so it stops short of the 5 tier.

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 permission model ('Members can delete their own reports; Managers/Admins can delete others' subject to org settings') implies who should call it, but there is no explicit when-to-use guidance or routing against alternatives such as update_time_report or permanent_delete_entity. 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.