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

Annotations already declare readOnly, idempotent, openWorld, non-destructive, so the safety profile is covered. The description adds genuinely useful behavioral context by detailing the returned content structure for each platform, which matters since there is no output schema; it does not cover failure modes (e.g., app not found) or coverage gaps, keeping it from 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?

Front-loaded with the core action, then organized by platform in two efficient sentences. Dense but every clause carries return-content information; no filler or repetition.

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 one fully documented parameter and no output schema, the description compensates well by enumerating the returned fields for both Android and iOS. Minor gaps remain around error behavior and whether data can be missing for some apps.

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% and the single app_id parameter already documents accepted formats (package name or numeric App Store id). The description adds no parameter-level meaning beyond the schema, so the baseline 3 applies.

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 ('Get an app's privacy information') and itemizes exactly what is returned per platform (Play data safety, Android permissions, Apple privacy labels). This clearly separates it from general siblings like get_app or get_app_reviews, though it never names those alternatives 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?

Usage is implied by the content list: call this when you need privacy/permission data rather than reviews or general metadata. However, there is no explicit when-to-use/when-not guidance and no reference to the sibling tools an agent should pick instead for adjacent needs.

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