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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=true. The description reinforces the read-only nature by saying 'Browse' and adds a behavior that responses are per-country and prices in that currency, which is extra context beyond annotations. It doesn't disclose edge cases like rate limits or pagination, but annotations carry most of the burden.

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, each earning its place: states what it does, usage nuances, and how the return is used. No waste, and the most critical info (browse categories) is front-loaded.

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?

Complete for a read-only browse tool with 0 required parameters and clear schema. It explains the optional parameters, the country/currency context, and the downstream use of returned CategoryID. Output schema is absent but the description lists what is returned, so nothing critical is missing.

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%, so the schema documents all three parameters. The description adds value by explaining the role of category_id (parent → subcategories) and that omitting it gives roots, which is a usage nuance. It also connects the returned CategoryID to ebid_search, giving purpose. This exceeds baseline 3.

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 'Browse' with a clear resource ('category tree') and enumerates the returned data (IDs, names, paths, counts). It clearly distinguishes from the sibling 'ebid_search' by indicating the returned CategoryID is used to filter it.

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 states when to use the tool (browsing categories) and how to use it (parent category_id for subcategories, omit for roots), but it doesn't explicitly mention 'when not to use' or alternatives beyond ebid_search. It does implicitly show how it differs from ebid_search.

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