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

Annotations only declare destructiveHint=true; the description adds real substance beyond that: a write to company HR records, employee-visible approval/rejection, notification side effects with a confirmation gate, and PATCH partial-update semantics ('Only the fields you pass change'). It omits permissions/auth requirements and whether status changes are reversible, which keeps it from a 5.

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?

Front-loaded with the core action, then the side-effect warnings, ending with partial-update semantics and the endpoint. Dense and mostly waste-free; the HTTP path is implementation detail that could be trimmed.

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 13-parameter mutation with no output schema, the description covers the riskiest aspects: write scope, employee visibility, notification gating, and partial-update behavior. Remaining gaps (return payload, applicability of kind-specific fields like puc or assisted_ssn) are minor since the schema labels those.

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 every parameter is already documented, including the send_notification/confirm_notification dependency. The description mostly restates those rules in prose, adding only the grouping of 'dates, hours, note, or its status' — 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 ('Change') on a specific resource ('presence/absence request') and enumerates the mutable dimensions: dates, hours, note, status. The verb alone distinguishes it from the create/delete siblings, so an agent can route correctly 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?

Gives conditional guidance that matters at call time: 'give rejection_reason when rejecting' and 'send_notification=true ... needs confirm_notification=true'. It does not explicitly exclude any case or name a sibling alternative, so it stops short of a 5.

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