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

The read-only annotations already establish safety, so the description earns credit for adding the important null-semantics caveat: unresolved ksao_type/canon_component_id values mean 'not yet joined', not 'no link'. This is genuinely useful behavioral context beyond the schema and annotations.

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 with no filler. The first sentence states the core purpose, the second gives the primary usage recipes, and the third provides the critical data-interpretation caveat. Everything earns its place and 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?

Given the rich 100%-covered schema, the output schema, and read-only annotations, the description is sufficiently complete. It highlights the three most important invocation patterns and the one subtle null behavior an agent needs to avoid misinterpreting results. No essential guidance 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 description coverage is 100%, so the baseline applies: the schema already documents each parameter thoroughly. The description's references to min_guides, role, and capability_detail mostly restate schema content rather than adding new parameter meaning, though it does frame them as intended use patterns.

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 names a specific verb ('Traverse'), a specific resource ('the capability spine'), and the entities involved (books, guides, KSAO elements, jobs). This clearly distinguishes it from sibling tools like list_guides and get_guide, which cover narrower slices of the same domain.

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 gives explicit, actionable patterns: min_guides=2 for cross-cutting capabilities, role=<role> for job requirements, and capability_detail=<slug> for hydrated package details. It lacks explicit when-not-to-use guidance or named alternatives, but the usage context is clear enough for an agent to select modes correctly.

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