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

Annotations already mark the tool as read-only and safe; the description adds concrete behavioral detail: at most two photos shown inline, direct photo links provided, and a postcard fallback when spot is empty. No contradictions with annotations.

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 sentences with the core behavior front-loaded and immediately followed by actionable parameter guidance. No filler or repetition.

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 full schema documentation, annotations, and an output schema present, the description covers the one non-obvious nuance an agent needs: how an empty spot changes the result. Nothing critical 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 covers both parameters, and the description enriches them by clarifying that leaving spot empty returns a postcard of the destination and giving a concrete example for spot. This goes beyond the static property descriptions.

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 that the tool returns real photos of a single spot, with up to two shown inline plus direct links, and explains the difference between naming a specific place and leaving spot empty for a destination postcard. This clearly distinguishes it from itinerary, briefing, and discovery 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?

The description implies photo-related use and gives parameter-level guidance, but it does not explicitly contrast this tool with siblings like top_spots or find_destinations. There is no clear when-to-use vs when-not-to-use statement.

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