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

Annotations already declare readOnly, idempotent, openWorld, and non-destructive behavior. The description adds some context about returned app data, but it does not disclose pagination, rate limits, auth requirements, or error behavior. It also misleadingly implies results are tied to a live POST request, though this doesn't contradict the safety annotations.

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?

Three sentences with redundancy ('keyword specified in a POST request' appears twice). The key fact—that this fetches stored results by id—is neither front-loaded nor stated at all, so the structure does not direct the agent to the essential information.

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?

An output schema exists, so return values need not be detailed. But for a simple fetch-by-id tool, the description must at least explain the retrieval-by-id operation and when to use it. It omits that entirely and mischaracterizes the input, leaving the agent without essential context to invoke correctly.

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% for the single id parameter, which would normally set a baseline of 3. However, the description discusses keyword, location, and language parameters that are not in this tool's schema, adding active confusion rather than meaning for the actual input.

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 says it provides a list of apps ranking on Google Play for a keyword, which describes output content rather than the retrieval action. It never mentions fetching results by task id, and the phrase 'keyword specified in a POST request' conflates this fetch tool with the submit sibling, so an agent cannot tell what the tool actually does from the description alone.

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 when-to-use guidance, no mention of alternatives such as the HTML variant or the submit tool, and no prerequisite that a task id from a prior POST is required. Usage context is entirely absent.

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