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

Annotations already cover the safety profile (readOnlyHint, destructiveHint false, openWorldHint false), so the bar is lower. The description adds value by disclosing the shape of the result — a catalog of kinds with layout counts — which matters since there is no output schema. It does not state whether the catalog is static or reflects the user's project state, a minor remaining gap.

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?

It is short but front-loads a negation about a different tool ('Not needed to start a new site') before saying what this tool is. The 'Useful for changing one section' and 'Start here when building a project from the library' sentences overlap, and '60-odd more' is filler. Information is present but ordering and redundancy cost it.

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 no parameters, no output schema, and annotations covering safety, the description supplies what's missing: the contents of the returned catalog and how it relates to create_project. An agent can decide whether to call it and what it will get back. Only the static-vs-dynamic nature of the catalog is left unstated.

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 tool takes zero parameters, so there is nothing to disambiguate; baseline 4 applies. The description correctly implies a no-argument catalog call by framing it as browsing the library's offerings.

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 resource — every section kind the UiChemy library ships (hero, features, pricing, footer, plus 60-odd more) and the per-kind layout count. It distinguishes the tool from create_project by noting create_project picks layouts automatically. It does not explicitly contrast with close siblings like uichemy_list_saved_sections, uichemy_describe_sections, or uichemy_search_layouts, so an agent still has to infer those boundaries.

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 gives explicit conditions: not needed when starting a new site via create_project with page names, useful when changing a single section, and the entry point when building from the library rather than an uploaded site. The named alternative (create_project) is a concrete routing signal. The opening negation about another tool makes the guidance slightly circuitous, but the when-to-use is clear.

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