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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds real behavioral context beyond that: results are ordered newest first, items carry images and links, and lookup is case-insensitive whether by name or id.

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?

Three sentences, front-loaded with what is returned before the how-to-call detail. No filler, though the closing sentence about using items as references is somewhat soft guidance rather than strictly necessary.

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 tool with an output schema and rich annotations, nothing an agent needs is missing: input form, ordering, content type, and the relationship to list_collections are all covered, and the output schema handles return values.

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 single parameter already has an example, so the baseline is 3. The description earns an extra point by specifying that the name should be passed 'as the person said it' and that casing is irrelevant, which is semantics the schema does not state.

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 a specific verb and resource ('Get the items in one of the person's saved collections'), names the domain (uxkin.com), and defines the content scope (app screens, whole apps, website designs). It is clearly distinguishable from list_collections, which enumerates collections rather than their contents.

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?

Gives a concrete selection context ('Use the items as the references the person chose for the task') and points to list_collections as the way to obtain an id. It stops short of an explicit when-not-to-use or a statement of when this beats find_ui_references/find_ui_materials.

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