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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds the payload scope ('in full' with photos and an external link), which is useful, but says nothing about failure behavior for an unknown id, ownership scoping, or photo format.

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?

A single front-loaded sentence with the verb and scope first and the returned fields enumerated after; no filler. The field enumeration partially duplicates what the output schema already carries, which is the only inefficiency.

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 one parameter, full schema coverage, annotations and an output schema, the description supplies everything needed to call it correctly. The only gap is edge-case behavior (missing/foreign id), which is minor given the structured fields.

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?

There is a single required parameter with 100% schema description coverage, including its origin ('A saved look id from search_my_looks'), so the schema does the heavy lifting. The description only reinforces that the id identifies a saved look, adding no format or validation detail beyond the schema.

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 and resource ('Get one saved look') and enumerates what comes back (steps, products/shades, tags, categories, notes, photos, BeautySpark link), which clearly separates it from list/search siblings. It stops short of naming an alternative such as search_my_looks to route discovery, so it is clear but not fully differentiated.

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?

Usage is only implied: the singular 'one saved look' plus the required id conveys a fetch-by-id operation. There is no explicit when-to-use/when-not guidance, no note that an id comes from search_my_looks (that hint lives only in the schema), and no mention of related siblings like get_look_status or list_my_generations.

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