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

Without annotations, the description carries full burden for transparency. It mentions billing per call (1 credit), which is a form of cost transparency, but says nothing about side effects, return value, or whether it's a read-only operation, leaving significant gaps.

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?

The description is extremely short, consisting of two fragments: 'Group: Mobile Apps' and 'Billing per call: 1 Credits.' While concise, it lacks a clear subject-verb structure and omits essential functional details, making it under-specified.

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 only one parameter and no output schema, the description still fails to explain what the tool returns or its purpose beyond the name. It lacks context on typical use cases, making it incomplete for an agent to understand the tool's role.

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?

The only parameter (app_id) is fully described in the schema with title, example, and description. The tool description adds no extra context beyond that, so it stays at the baseline for full schema coverage.

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?

The tool name clearly indicates it retrieves Play Store app details, and the description reinforces this with 'Play Store / App Details.' It distinguishes from sibling tools like top apps, but the description lacks an explicit verb, relying on the name for clarity.

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 description provides no guidance on when to use this tool versus alternatives (e.g., when to use this instead of get_v2_play_store_top_apps). It only includes billing info, which does not help in tool selection.

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