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

With no annotations and no output schema, the description carries the full behavioral burden. It does disclose the shape of the return payload (title, description, version, screenshot URLs) and that data is scoped to one app and one language, which is genuinely useful given the missing output schema. It says nothing about permissions, error behavior when the app or version is not found, or what happens when language is omitted.

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?

A single compact sentence with no filler or redundancy. It is efficient, though as a verbless fragment it is not ideally front-loaded for an action tool.

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?

For a three-parameter tool with zero annotation coverage, no output schema, and no parameter documentation, the description is too thin. It also leaves the role of the 'version' input unresolved, so an agent cannot confidently construct a call.

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 0% across three parameters, so the description must compensate, and it does not. It mentions 'app' and 'language', loosely mapping to appId and language, but omits the numeric-ID constraint, the two-letter language code format, and never clarifies whether 'version' is an input selector or only a returned field. That ambiguity is actively confusing.

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 description names the resource scope ('one app and language') and enumerates the returned fields (title, description, version, screenshot URLs), so the intent is inferable. However, it is a noun phrase with no verb, and it never distinguishes this from siblings like get_app_market, find_apps, or search_apps, which also deal with app data. That leaves the agent guessing about the exact operation.

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?

There is no statement of when to use this tool, no prerequisites, and no mention of alternatives such as get_app_market or find_apps. The agent must infer usage purely from the tool name. No guidance is provided at all.

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