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

Annotations already state readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds useful scope by saying it returns the *last* crossing and includes product phrase, verdict, and report, but it does not cover behavior when no memory exists or when both/no parameters are supplied.

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?

It is a single front-loaded sentence with no obvious filler. The terseness is efficient, though the undefined jargon makes it less clear rather than maximally useful.

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?

For a simple read-only recall tool, annotations cover safety, but with 0% schema description coverage and no output schema the definition should explain ref vs idea and the no-argument behavior. Too much is left for the agent to infer about invocation and return semantics.

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 0%, and the description never names the ref or idea parameters or explains their optionality. It only hints that a paper or idea can be looked up, leaving unresolved how ref differs from idea and what happens if both or neither are provided.

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 identifies a recall capability over 'the last crossing of a paper or idea' and lists returned components such as product phrase, verdict, and report, but the verb is implicit and the jargon 'Sibyl/crossing' is not defined. It also does not distinguish this tool from siblings like knos_memory_search or knos_crossings, so sibling selection remains ambiguous.

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 no when-to-use guidance and does not say when to prefer this over knos_memory_search, knos_crossings, or knos_cross. No exclusions or conditions for use are stated.

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