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

With no annotations, the description carries the full behavioral burden. It does disclose that the result is the complete set ("all 15") and that subcategories are included, which signals a read-only enumeration, but it says nothing about ordering, pagination, or what happens if categories change.

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?

One sentence, front-loaded with the verb and resource, with no filler. Nothing can be removed without losing 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?

This is a trivial zero-parameter listing tool with no output schema, so the description needs only to say what it returns; it does, including subcategories. The only gap is that it doesn't position the call relative to search_capabilities.

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 takes zero parameters, so the baseline is 4. The description correctly implies no filtering is possible and that the entire taxonomy is returned.

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 gives a specific verb and resource ("List ... capability categories and their subcategories") and adds a concrete scope detail (exactly 15 categories). It never mentions the closest sibling, search_capabilities, so an agent must infer the browse-vs-search distinction on its own.

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?

Usage is only implied: a zero-parameter lister naturally reads as a discovery/entry-point call. There is no explicit guidance on when to call this instead of search_capabilities, nor any stated ordering, e.g. browse first, then search.

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