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

Annotations already declare read-only, idempotent, non-destructive, closed-world behavior, and the description adds useful context: capped at 5 results, returns place_id and country, and defines the ambiguity-handling policy. It stops short of discussing matching/fuzzy-failure behavior, so not 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?

One front-loaded 'Use when' clause followed by a single disambiguation sentence; every clause carries actionable information with zero filler.

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 a full schema, an output schema, and rich annotations, the description supplies exactly the missing pieces — the trigger condition, the consumers, and the multi-match policy — leaving nothing an agent needs unanswered.

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% and already documents query (city/region/island, any language) and the language enum, so the description only restates the query semantics without adding format constraints or examples. 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 transformation (city/region/island name → place_id) and identifies the exact consumers of that id (search_hotels, get_hotel_facts, get_price_guide), so it is unmistakable against its siblings.

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 an explicit trigger ('Use when ... has to be turned into a place_id'), names the downstream tools that require it, and prescribes resolution behavior when multiple matches exist ('choose by country or ask the user').

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