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

With no annotations, the description must carry the transparency burden. It implies a read-only operation ('Get statistics') and enumerates the returned categories, but it does not state explicitly whether the call has side effects, requires auth, or what the output structure looks like. This is adequate for a simple read-only tool but not rich.

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 a single, front-loaded sentence that conveys the tool's purpose and key output categories with zero wasted words.

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 zero-parameter, output-schema-less tool, the description is reasonably complete: it names the resource and expected statistic categories. However, it does not specify the exact response format or whether results are aggregated counts, which would be helpful given the lack of an output schema.

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 tool accepts zero parameters, so the baseline is 4. The description adds value by clarifying what 'statistics' means (sets, styles, authors, game families), which helps the agent understand the output even without parameter explanations.

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 uses a specific verb ('Get') and resource ('piece gallery') and lists the exact statistics fields (total sets, styles, authors, game families). This clearly differentiates it from sibling tools like piece_gallery_search or piece_gallery_get_set, which have different purposes.

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 guidance on when to use this tool versus similar gallery stats tools (e.g., board_gallery_stats, tile_gallery_stats) or the piece gallery search/get_set tools. The description states only what it does, not when it is the preferred choice.

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