get_size_groups

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

With no annotations provided, the description must carry the full burden of behavioral disclosure. It states that results are cached for 1 hour, which is a key behavioral trait. No contradictions are present. The score reflects good transparency but a slight gap (e.g., no mention of rate limits or potential errors).

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 tightly written with no wasted words. It front-loads the purpose, explains the output structure, provides usage guidance, and mentions caching—all in a compact paragraph.

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?

Given that there is no output schema, the description thoroughly explains the return structure (list of groups with IDs, captions, descriptions, and array of sizes with numeric IDs and display titles). It also explains how to use the output, making it fully complete for an agent.

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 coverage is 100%, so the parameter descriptions are already present. The description adds useful context: 'size catalogues are shared across countries', which goes beyond the schema. This extra insight warrants a 4.

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 starts with 'Fetch all Vinted size groups with their constituent size IDs and labels', which is a specific verb+resource combination. It clearly identifies the tool's purpose and distinguishes it from sibling tools like get_categories or get_colors.

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?

The description explains how to use the output by passing size IDs to search_items.sizeIds or search_all_items.sizeIds. It provides clear context but does not explicitly state when not to use this tool or mention alternatives, which keeps it from a 5.

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