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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds real value by explaining result fields and the stage semantics ('beta': works, but things may still break; tell the owner before they buy), plus the deprecation of plan in favor of cloudflarePlan. However, it says nothing about result limits, ordering, or pagination behavior of the search itself.

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?

Purpose is front-loaded in the first sentence and the rest is dense field-by-field explanation with almost no filler. The long parentheticals (stage, price_text, cloudflarePlan) make it a heavy read, though each carries useful disambiguation such as 'free' meaning the Cloudflare plan, not the price.

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 appropriately explains the returned fields (category, categories, stage, stage_note, price_text, prices, price_list, cloudflarePlan) and the deprecated plan field. It leaves some gaps for a search tool — result ordering, any limits on returned items, and whether results are scoped to the caller's site.

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 the baseline is 3, and the description genuinely adds meaning: query is framed as 'what the site needs' with examples, empty query is defined as list-all, and category is described as narrowing apps in catalog order. The kind enum's effect is only implied rather than spelled out.

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 — 'Find site apps and free playbooks (how-tos) by what the site needs' — with concrete example queries ('contact form', 'redirects', '404'). It is clearly a discovery/search tool, distinguishable from detail-fetching siblings like get_app and get_playbook.

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 a clear usage rule for the empty query ('Leave query empty to list everything') and explains how category narrows results. It stops short of explicitly naming when to prefer get_app/get_playbook for follow-up detail, so routing to siblings is implied rather than stated.

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