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

Annotations (readOnlyHint, idempotentHint, destructiveHint) already establish that this is a safe read-only operation. The description adds minimal behavioral context, such as the fact that it returns a history and is filtered by date/platform. It does not contradict annotations and provides some context beyond them, but it does not disclose any additional traits like pagination or data volume. A score of 3 is appropriate given the strong annotation coverage.

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 but redundant: it repeats the identical sentence twice, once prefixed with 'Guidance:'. This adds no value and wastes the agent's attention. The first sentence is sufficient and front-loaded, but the duplication harms conciseness and structure. A score of 2 reflects this unnecessary 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?

For a simple list operation with fully documented optional parameters and comprehensive safety annotations, the description provides the core functionality. However, it lacks any guidance on usage context or edge cases (e.g., what 'downloads' specifically refers to, whether results are ordered). Given the low complexity and complete schema, the description is minimally adequate but not thorough. A score of 3 aligns with 'adequate but with clear gaps'.

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 schema describes all three parameters (end_date, start_date, platform) with formats and defaults, achieving 100% coverage. The description essentially restates that downloads are filtered by timestamps and platform, adding no new information beyond what the schema provides. With full schema coverage, the baseline of 3 is correct; the description does not elevate it.

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 clearly states the tool returns download history filtered by timestamps and platform. It uses a specific verb ('Returns') and resource ('history of downloads'), which is distinct from the sibling 'shop_list_downloads_global' even though it doesn't explicitly name the sibling. The repetition of the same sentence does not detract from 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?

No guidance is provided on when to use this tool versus alternatives. The sibling list includes 'shop_list_downloads_global', but the description does not mention it or any criteria for choosing one over the other. The description only restates the core function without contextualizing its scope relative to other download-related tools.

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