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

Annotations already establish readOnly=true, destructive=false, openWorld=false, so safety is covered. The description adds genuine workflow behavior beyond that: that this is a two-step discovery flow culminating in uichemy_template_slots. It doesn't describe return shape or how withThumbnails behaves, which keeps it below 5.

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?

Only three sentences and roughly forty-five words, so nothing is bloated. However, the actual purpose is buried in the second sentence behind a negative caveat, and the caveat's colon construction is dense to parse. Front-loading the purpose would improve 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?

For a simple read-only enumeration tool with no output schema and full parameter documentation, the description covers purpose, when to use it versus create_project, and the follow-on call. It lacks any hint of what the returned layout entries look like, but that is minor given the tool's simplicity.

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 description coverage is 100%, so both 'kind' and 'withThumbnails' are already documented, including the pointer to uichemy_list_section_kinds and example values. The description only restates 'one section kind' and adds nothing new about parameter usage; baseline 3 applies.

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 concrete verb-and-resource: 'The layout ids available for one section kind.' An agent understands it returns template/layout identifiers scoped to a section category. It does not differentiate itself from similarly named siblings like uichemy_find_templates or uichemy_search_layouts, which is the only clear gap.

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 an explicit when-not ('Not needed to start a new site') with the alternative named (uichemy_create_project with page names), and an explicit when ('Useful for changing one section'). It also names the immediate next step (uichemy_template_slots), so the call is fully sequenced.

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