Get Unsplash Photo

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

Annotations already provide readOnly and openWorld hints; the description reinforces read-only behavior and additionally documents what the response contains: raw imgix URL, appended customization params, and fixed size variants. This adds useful behavioral detail beyond the 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 compact, front-loaded with the action, and every clause adds value. The raw URL example is practical and concise, providing exactly the customization guidance an agent needs.

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 tool with one required parameter and no output schema, the description sufficiently covers input and output: ID/slug lookup, returned detail/URLs, attribution, and available image variants. An agent can invoke the tool and interpret the response correctly.

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 the schema already describes 'id' as 'The Unsplash photo ID or slug.' The description repeats this same information and does not add new parameter-level semantics, so it stays at the baseline.

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 specific operation: get a single Unsplash photo by ID or slug, with full detail and URLs. It also distinguishes itself from sibling tools like list_photos, search_photos, and random_photo by emphasizing lookup of one specific photo.

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 conveys the main usage context: use when you have a known photo ID or slug and need that photo's detail. It does not explicitly name alternatives or exclusion conditions, but the 'single photo by ID/slug' framing makes the intended use clear.

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