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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so safety is covered. The description adds genuinely new behavioral facts: sold-out venues are returned with available:false, results are not rendered on screen, and prices must never be converted or estimated. It stops short of return-format/pagination detail, but this is well above the annotation bar.

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-loads purpose and the returned shape, then usage routing, then naming/price guardrails. Dense but largely non-redundant; the proper-noun and price-exactness sentences are operational instructions rather than tool semantics, which slightly dilutes focus.

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?

An output schema exists, yet the description still summarizes the returned fields, covering edge cases (sold-out venues, availability flag, booking link) that an agent needs for reasoning tasks. Combined with full annotation coverage and full schema coverage, nothing material is missing.

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 the baseline is 3. The description only adds a small nuance beyond the schema — that country alone works for smaller markets like Mauritius, and that prices/currency must be passed through verbatim — while city/date/sort/type/locale semantics live entirely in the schema.

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 (search) and resource (DayPass venues and their bookable experiences), plus the query axes (city or country/island). It explicitly distinguishes itself from render_results and get_experience, so an agent can route without opening sibling schemas.

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 explicit when-to-use ('when you need the data to reason or answer a specific question'), when-not ('to show options to the user, use render_results'), and the escalation path for detail ('call get_experience with an experience id'). Concrete example questions make the intent unambiguous.

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