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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), so the bar is lower. The description adds genuinely valuable behavior the schema/annotations do not: that the topic argument performs no filtering and every topic yields the same city ranking, plus an explicit note that no tips/logistics text is returned. That is exactly the kind of honesty that prevents misuse.

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?

Four short sentences, front-loaded with the usage trigger followed by the return shape and the caveats. Every sentence carries information; minor room to tighten the redundancy between the topic caveat and the payload note.

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 an output schema present, return values need not be explained, and annotations cover the safety posture. The description completes the picture by flagging the topic no-op and the absence of tips/logistics content. Only the sibling-disambiguation gap keeps it from a 5.

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 schema already documents city, the topic enum, format and language. The description's statement that topic is a no-op duplicates the schema's own note but reinforces it, which is helpful yet not net-new information. 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?

States a specific verb+resource (ranked search of bookable experience rows) and scopes it to a city plus keyword/topic. It does not name any of the many sibling search tools (search_experiences, search_local_experiences, search_by_mood), so an agent cannot fully disambiguate from siblings on the description alone.

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 a clear trigger condition ('when the user asks for bookable experiences by keyword or topic in a city'), which is real guidance. However, with ~27 siblings including several near-identical search tools, it offers no when-not or alternative routing, so the agent must infer which search tool to pick.

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