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

The annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds one genuinely useful behavioral detail: matching is exact against a finite picklist rather than fuzzy. It does not mention match failure behavior, case sensitivity, or result count, and an output schema exists, so the remaining gap is modest.

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 compact sentence with the resource and matching semantics front-loaded and no filler. It could trade a few words of vagueness for a clarifying clause about the query format without becoming bloated.

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 rich annotations and an output schema, the description does not need to explain safety or return values. What it still lacks is guidance on query format and the no-match case for a single-required-parameter lookup tool. Adequate but with a clear, actionable gap.

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%, so the single 'query' parameter relies entirely on the description, which only obliquely indicates it should describe what the business does. The word 'exact' creates ambiguity about whether the value must be a verbatim picklist entry or a free-text description. This is partial compensation, not full.

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: finding exact entries in CAC's line-of-business picklist. This clearly separates it from sibling tools such as search_cac_register and check_business_name_compliance, which operate on different datasets. Only the phrase 'matching what the business does' keeps the purpose from being fully unambiguous.

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 phrase 'matching what the business does' implies that the tool is used when translating a business activity into the official line-of-business category, but the description never states when not to use it or names a preferred alternative. It also doesn't say what to do if no exact match exists, which is a realistic failure mode for a picklist lookup.

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