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

Annotations already flag readOnlyHint=false and idempotentHint=true, so the mutation/idempotency profile is known; the description adds real context beyond that — credit consumption, purchase gating, and free re-retrieval. It doesn't disclose error behavior or what exactly is produced when the theme is locked.

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 tight clauses with the core action front-loaded, then cost, then the discovery route. No filler, though the credit/purchase clause is somewhat dense and could be split for scanning.

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 12-parameter, 10-required tool with 0% schema coverage and no output schema, the description is under-specified. It never explains the semantics of most inputs or the shape of the returned theme files, so an agent cannot confidently construct a valid call.

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 0% across 12 parameters (10 required), so the description must carry the burden. It names only a few fields (colors, fonts, 1–8 section IDs) and leaves the rest — theme, brand, headline, description, cta, email, mode, motion, palette — entirely undocumented in both schema and prose.

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: returning complete customized React theme files with colors, fonts, and 1–8 section IDs. It nudges the agent to list_themes for ID discovery, giving some sibling differentiation, though the boundary against get_section/list_styles is only implicit.

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?

Clear context for use: requires a purchased theme or one of five monthly Pro credits, repeat retrievals of unlocked themes are free, and theme IDs come from list_themes. Lacks explicit when-to-use vs alternatives among get_section/list_styles, but the precondition and cost guidance are solid.

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