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

Annotations already establish readOnly/non-destructive/closed-world, so the bar is lower, and the description still adds real behavior: output is a download command rather than raw CSS by default, the file is self-contained and works with Tailwind v4, v3, or none, and coverage is bounded by the layouts passed. It does not discuss failure modes or what happens if an unknown layout kind is supplied.

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?

Front-loaded with what is returned, then routing, then parameter guidance. Four dense sentences with parenthetical asides; nothing is filler, though the parenthetical and the inline sentence could be tightened.

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 output schema, the description does the work of saying what comes back (a download command, or CSS itself when inline is set). Combined with the coverage caveat and framework compatibility, an agent has enough to call it correctly; error behavior and the layout kind vocabulary remain 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?

Schema coverage is 75% and already documents fonts/palette/inline/layouts shapes, so the baseline is 3; the description adds non-obvious semantics — that palette and fonts brand every section at once, and that layouts must enumerate the full set for the kit to cover it. It does not clarify the hex format of palette beyond the schema's #RRGGBB notes or the layout `kind` vocabulary.

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+resource (produce the stylesheet / CSS file the library sections need for a user's React app) and explicitly distinguishes itself from the sibling that overlaps: 'uichemy_get_page_code already includes it.' An agent can route between this and get_page_code without opening either schema.

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?

Explicit when-not (get_page_code already contains the stylesheet), explicit completeness rule ('pass every layout the app uses'), explicit re-invocation trigger ('when a section is added, run it again with the full list'), and an explicit condition for the alternative output mode ('Set inline only when the caller cannot run a command').

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