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

Annotations already declare destructiveHint=true and idempotentHint=true, so the safety profile is covered. The description adds important context not in annotations: required roles and that the whole calendar is returned. It stops short of stating whether removal is soft or permanent, but the destructive hint carries that weight.

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?

Two compact sentences, front-loaded with the action and target, with no wasted text. The id source, permissions, and return behavior each earn their 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 single-parameter destructive tool with no output schema, the description covers the id source, authorization, and return shape ('Returns the whole calendar'). It leaves minor gaps around invalid-id behavior and soft-vs-hard deletion, but the annotations cover the main destructive signal.

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 the baseline is 3. The description adds meaningful value by telling the agent that the id comes from get_working_calendar, which the schema's bare 'Day-off id' does not convey.

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 and resource ('Remove a holiday or leave entry') and clearly distinguishes itself from the sibling add_day_off. An agent can identify the operation and target 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?

Explains where to obtain the required id ('from get_working_calendar') and who may call it ('Administrator or ProjectManager'). It does not explicitly exclude cases or name alternatives, but the context is clear enough for correct selection.

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