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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered structurally. The description adds almost nothing beyond the annotations other than the 100-patent scale, saying nothing about result volume, paging of citing records, latency, quota, or what happens when an ID is invalid.

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 front-loaded sentence with no filler or repetition, which is structurally clean. It is arguably under-specified rather than over-specified, and there is nothing wasteful to trim.

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?

There is no output schema and the annotations are solid, so the description need not explain return values or safety. But for a citation tool in a family of near-synonymous patent tools, it should say how citing records are returned and how this differs from references/forward-citation tools; that gap is meaningful.

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 schema already documents the 100-item limit, the comma separator, and the precedence of patentId over patentNumber. The description reinforces the 'up to 100 patents' constraint but adds no new meaning such as how Nexscope IDs differ from publication numbers. 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?

The description names a specific operation and resource (cited-by counts and citing patent records) with a concrete scale limit (up to 100 patents), which is far more informative than the title 'Patent Cited By'. However, it does nothing to distinguish this from near-identical siblings such as nexscope_data_zy_patent_cited, nexscope_data_zy_patent_forward_citation, or nexscope_patent_references, whose names suggest overlapping semantics.

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 single sentence gives no guidance on when to choose this tool over the patent-references or forward-citation siblings, no prerequisites, and no statement of when not to use it. An agent must guess between multiple citation-flavored tools from its own knowledge.

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