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 genuine interpretive context by flagging that 'plan' is deprecated and repeats 'cloudflarePlan', that 'cloudflarePlan' is a plan name and not a price, and that 'price_text' is the plain-words price with cents in 'prices'/'price_list'. It adds an agent-facing obligation (surface beta stage and requirements to the owner before purchase) but says nothing about error behavior for unknown app ids.

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?

Content list is front-loaded, followed by usage guidance and then field disambiguations; nearly every clause carries information. The final clauses about price_text/cloudflarePlan/plan are dense and slightly run-on, but they are all disambiguations rather than 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 reasonably carries the return-shape burden by naming the returned concepts (requirements, price, versions, stage, inclusions) and disambiguating overlapping price/plan fields. It is nearly complete for a two-optional-param read tool; the only real gap is the app/app_id alias handling and failure modes, which the schema partially covers.

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%, including the note that app and app_id are aliases and one is required, so the baseline is 3. The description adds no parameter-level guidance of its own — it never mentions app_id or how to source the id (only the schema does, via 'from search_catalog').

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 ('One app's requirements... price, versions, stage... what's included') and enumerates the return contents, which cleanly separates it from list-oriented siblings like list_owned or search_catalog. An agent can tell immediately that this is the single-app detail lookup.

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?

Provides a clear timing cue: 'Tell the owner the requirements, and that the app is in beta when it is, before they buy,' which places it in the pre-purchase flow. It does not name sibling alternatives (e.g., use search_catalog first to get the id, or check_updates for versions) nor state exclusions.

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