review_compare_apps

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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so the safety profile is covered. The description adds useful scope context ('recent reviews', 2-8 apps, sampled negatives), but does not disclose how far back 'recent' reaches or any rate/coverage limits.

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?

Two tight sentences: the first front-loads what is compared and what comes back, the second states the payoff. No filler, no repetition of the tool name.

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 an output schema present, return values need not be explained, yet the description still summarizes them, and it caps the app range. Only the meaning of 'recent' and any result-size caveats are left unstated, which is a minor gap for a read-only analytical tool.

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 67%, and the description reinforces the 2-8 app bound implied by minItems/maxItems. It adds no syntax or format guidance for country, language, samples_per_app or max_reviews_per_app beyond what the schema already states, so it sits at the baseline.

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 ('compare recent reviews of 2-8 competitors side by side') and enumerates the compared dimensions (rating, negative share, complaint terms, samples). It is distinguishable from siblings like review_fetch and review_top_apps, though it never names them explicitly.

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 usage motive ('Use it to find gaps that every competitor fails at = product opportunity'), which implies the comparison context. However, it gives no when-not guidance and does not name alternatives such as review_top_apps or review_search_apps for single-app or discovery needs.

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