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

Annotations already declare this is a non-read-only, non-destructive, non-idempotent mutation, so the safety profile is covered. The description adds the cross-reference to get_household_overview for valid member names, which is genuine behavioral context. It does not say what happens on repeat calls for the same member/date, or whether an existing dinner plan is affected.

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?

One sentence, front-loaded with the action, with no filler. The trailing clause 'by the name get_household_overview shows' is slightly awkward but carries real information about name provenance.

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 two-parameter mutation with no output schema and reasonable annotation coverage, the definition is mostly adequate: it states the effect, required inputs and name source. It stops short of describing the effect on the existing dinner plan or behavior on duplicate marking, which matter for a non-idempotent write.

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, but the description adds a constraint the schema lacks: memberName must match a name surfaced by get_household_overview. That is an actionable validity rule an agent could not infer from 'Name of the member who is away.'

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?

Specific verb+resource: marks one household member as not home for dinner on a given date. The phrase 'one member of the household' implicitly separates it from the bulk sibling mark_away, but no sibling is named explicitly, so the differentiation is inferred rather than stated.

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?

Usage is implied by the tool's phrasing (per-member absence on a date) and the description usefully points to get_household_overview as the source of valid names. It never states when to prefer this over mark_away or mark_eating_out, nor any prerequisite like an active plan for the date.

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