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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds the returned field set (status, confirmation, hours, vacation days) and the underlying endpoint, but says nothing about not-found behavior, permissions, or rate limits, so it is modestly additive.

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 short fragments, front-loaded with the resource and id constraint before the field list; nothing is padded. The trailing 'GET /absences?id=.' with a dangling value is slightly rough but costs almost nothing.

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?

With no output schema, the description usefully fills the return-value gap by naming the fields returned, and the single required parameter is fully covered by the schema. For a simple id-based getter, an agent has enough to call it correctly.

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% with a single required 'absence_id' already documented as 'Papershift absence id' with bounds. The description's 'by id' merely restates the schema, so 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?

The description names a specific verb+resource ('One absence by id') and enumerates the payload fields (status, confirmation, hours, vacation days), which clearly separates it from the bulk list_absences sibling. It stops short of explicitly naming that sibling as the alternative, so it is clear but not maximally differentiated.

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 phrase 'One absence by id' implies this is the single-record fetch to use when an id is already known, as opposed to list_absences, but no when-to-use/when-not guidance or alternative is stated explicitly. Usage is inferable rather than instructed.

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