Track Unsplash Photo Download

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

The description clearly discloses the side effect (downloads are counted toward the photographer's stats) and explicitly warns it is NOT read-only, which aligns with annotations readOnlyHint=false. It also adds non-obvious behavior: it returns a fresh, usable image download URL. No contradiction 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?

The description is tight and well-structured: it states the purpose, the required input, the return value, and the critical side-effect warning in four purposeful sentences. Nothing is redundant or unnecessary.

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?

For a single-parameter side-effectful operation, this is complete. It explains why it exists, when and how to call it, what it returns, and what the consequences are. No important contextual gaps remain.

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?

The schema already fully describes the single parameter with clear guidance at 100% coverage. The description repeats the same instruction about passing the download_location URL, adding no substantial new semantic information beyond the schema, so a baseline score is appropriate.

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?

The description clearly states the tool's action ('Register a download'), the exact resource (a photo download), and the triggering condition (actually used/displayed). This distinguishes it from all sibling tools, which cover listing, searching, and modifying photos or collections, not tracking downloads.

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?

It explicitly explains when to call the tool — on actual use/display per Unsplash API guidelines — and when not to call it: only on real use, because it is not read-only. It also tells the agent to pass the download_location from a prior photo result, fully specifying the required context.

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