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

Read-only and idempotent annotations already establish safety; description adds functional behavior (returns totals and distribution) and optional platform filtering without contradicting 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?

Core description is concise but the trailing 'Guidance' sentence repeats the same content, adding redundancy without new 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?

For a simple read-only aggregate tool with no output schema, the description gives enough context about what is returned and how platform filtering works, though it does not specify exact output format.

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 fully describes the platform parameter with enum values and default; description adds little beyond stating the platform is used for filtering.

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?

Description clearly states it returns aggregate all-time download counts and version distribution for a specified platform, distinguishing it from the similarly named sibling shop_list_downloads by indicating global aggregation.

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?

No explicit guidance about when to choose this tool over alternatives such as shop_list_downloads; the 'Guidance' text merely restates the description without adding decision criteria.

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