Get Unsplash User

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

Annotations already provide readOnlyHint=true and openWorldHint=true, covering side effects and access boundary. The description adds the qualifier 'public profile' but does not disclose other behaviors like response shape, whether the user must exist, or error semantics. Given the annotations, the bar is lower; this is adequate but not enriched.

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 one clear sentence plus a short 'Read-only.' that is redundant with the readOnlyHint annotation. The core sentence is front-loaded and contains no fluff, but the redundancy prevents a top score.

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, read-only tool with readOnlyHint and openWorldHint annotations, the description sufficiently captures the tool's function and scope. It lacks an explicit payload description or output details, but with no output schema the implied 'public profile' return value is enough for the simplicity level.

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 covers the usernname parameter fully: type string, minLength 1, description stating 'The Unsplash username (without the @)'. The description's 'by username' adds no extra semantics beyond the schema. With 100% schema coverage, baseline 3 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 states a specific verb ('Get'), resource ('an Unsplash user's public profile'), and scope ('by username'), making the tool's purpose unmistakable. 'Public profile' distinguishes it from sibling tools like unsplash_user_photos, unsplash_user_collections, or unsplash_user_statistics, which fetch other aspects of a user.

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 gives clear context: use this tool to retrieve a user's public profile when you know the username. It does not explicitly mention alternatives or when-not-to-use, but the resource-scoping ('public profile') and the username requirement imply when it is appropriate compared to searching or other user endpoints.

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