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

Adds real context beyond annotations: the downstream effect (those days count as working days again in the Workload) and the confirm gate with a preview fallback for any non-true value. That tells the agent the blast radius and the safe dry-run pattern, which destructiveHint alone does not convey.

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?

A single compact sentence that front-loads the action, then the effect, then the required flag. No filler or repetition of the title.

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 2-parameter destructive tool with no output schema, it covers everything an agent needs: what gets removed, whose record it can be, the system consequence, and the mandatory confirm semantics including the preview outcome.

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%, so baseline is 3; the description still adds meaning by framing confirm as a safety interlock (preview vs. commit) rather than a plain boolean, and by restating the entitlement scope of timeOffId.

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 (Deletes) and resource (a time off), and scopes whose time off can be removed (the user's own, or on Pro an editor's). It doesn't explicitly name the closest sibling (update_time_off / delete_time_entry), but the destructive verb makes the distinction reasonably self-evident.

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 the operative condition — call with confirm: true to actually delete; without it you only get a preview — which effectively tells an agent both when to call and how to probe safely first. It does not mention alternatives such as update_time_off for modification instead of deletion.

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