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

Annotations already cover the safety profile (readOnlyHint=true, destructiveHint=false, openWorldHint=false). The description adds genuinely new behavior: traversal depth is exactly one hop, and an unknown refId returns the literal string 'No entry'. It omits ordering/completeness guarantees, so it falls short of a 5.

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?

Two sentences, front-loaded with what is returned, followed immediately by the traversal scope and the follow-up tool. Every clause carries information; no filler.

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?

With no output schema, the description usefully enumerates the projected fields (refId, title, evidence level, section), plus traversal depth and error behavior for a read-only one-parameter tool. Minor gaps remain around result ordering or empty-relationship cases.

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% and the single refId parameter is documented with an example ('REF-001 or SYNTH-04'). The description reinforces that an exact refId is required and notes the unknown-id outcome, but adds no format or syntax detail beyond the schema, so baseline 3 applies.

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?

States a specific verb and resource ('List the entries one knowledge-base entry cross-references') and pins the scope precisely as 'one hop in the citation graph'. It also names the returned fields, so an agent can distinguish it from get_knowledge without opening either schema.

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?

Gives an explicit when-to-use scenario ('walk from a nearly-right search card to its neighbours') and names the follow-up alternative ('read the one you need with get_knowledge'). Nothing about routing is left to inference.

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