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

Annotations cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description's job is to add output context — and it does, disclosing the row structure, basis dimensions, Verified/Flagged status, notes, Topic 29 discontinued notices, and the KB confidence tags. Missing pagination/limit behavior but otherwise rich.

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?

Front-loads the input scope and outputs efficiently, with no filler sentences. The single dense paragraph is slightly run-on, but every clause carries routing or verification value.

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?

An output schema exists, yet the description covers the non-obvious return semantics (confidence tags, Topic 29 notices, basis comparison) that an agent needs to interpret results and route correctly. Nothing critical is missing for this read-only lookup.

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 all four parameters are already documented, including the maker list and category filter values. The description restates the covered vendors 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?

Names a specific verb (cross-reference/find equivalent) and resource (aluminum framing series) with concrete input examples ('Kawneer Trifab 451', '1600 Wall System 1') and enumerates the vendors covered. It is clearly distinguishable from sibling cross_reference_glass.

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?

States the trigger condition (given a storefront/curtain wall/entrance/window/Interior/Specialty series, return equivalents) and adds a caution that 'equivalent does not mean identical' with the attributes to verify. It does not, however, explicitly name alternative tools or when-not-to-use conditions.

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