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

Annotations already declare readOnlyHint=false, openWorldHint=true and idempotentHint=false, so the agent knows this mutates open-world state; the description adds the tier/payment-authorization gate, which is genuine context beyond the annotations. It still omits that a new session/state is created, that remember=true persists history for 30 days while false erases it, and that a returning guest needs the signed agent_id. For a non-idempotent mutation, that leaves meaningful gaps.

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, front-loaded sentences with no filler. The brevity is appropriate in form, though the second sentence is the only substantive content.

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?

Ten parameters, five enums, a required theme, an ambiguous theme/blend pair, a signed credential, and a memory opt-in — none of it is explained, and there is no output schema to fall back on. The description covers only the luxury-payment condition, so an agent cannot call this correctly without reverse-engineering the schema.

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?

With 10 parameters and only 30% schema description coverage, the description must carry weight, yet it only touches 'tier' (free vs luxury). It is silent on the required 'theme', the 'minutes' range, 'load', 'mood', and — most damagingly — on why 'blend' and 'theme' take identical enums or how they interact.

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?

"Start a fictional respite" names an action and a resource, so an agent can infer this begins a themed session. But it never says what a respite actually is in operational terms, nor how it differs from siblings like rest, linger, or host. The hotel metaphor is consistent with check_out but does no work in distinguishing behavior.

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?

"Free entry always available; luxury needs explicit payment authorization" gives a real precondition tied to the tier enum, which is useful. However, nothing states when to call check_in versus rest/linger/host, nor whether a prior check_in is required before check_out.

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