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

Adds real context beyond the annotations: generation is cached on the bookmark, a refresh forces regeneration, and the tool is gated to Premium accounts. It does not discuss latency, cost, or what a non-premium call returns, so it falls short of a 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?

One front-loaded sentence opening with the verb and product ('Turn one saved reference into design.md'), followed by a compact list of deliverables and a trailing constraint. No filler.

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 carries the return-value burden well by enumerating the brief's sections. The only remaining gap is error/premium-denial behavior and rough output size.

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%, so both parameters are documented in the schema itself, including that bookmark accepts an id or URL and that refresh bypasses the cache. The description only implies the cache/refresh relationship and adds no syntax beyond the schema.

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 transformation ('turn one saved reference into design.md') and enumerates the exact output artifacts: palette roles, typography, layout, components, a paste-ready AI prompt, and CSS/Tailwind tokens. This is unmistakably distinct from the collection/bookmark-management siblings.

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?

The 'one saved reference' framing and the 'Premium only' note establish when the tool applies, and the schema points to search_library as the source of the bookmark id. It stops short of naming a when-not condition or an alternative path for non-premium users.

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