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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior, so the safety profile is covered. The description adds that the list is 'full' (implying no pagination) and includes meanings, but says nothing further about caching, format, or other behavioral traits.

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 short, front-loaded sentences with no filler, and the usage trigger comes before the bilingual restatement. The Korean translation duplicates the same content, which is a small redundancy for non-Korean agents but is clearly intentional.

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 parameters and no output schema, the description carries the burden of describing the return payload, and it does so at a high level ('full list of classification values ... with what each means'). It stops short of describing the record shape, but for a zero-arg codebook that is a minor 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?

The tool takes zero parameters, which is the baseline-4 case; there are no parameter semantics to explain. The description correctly implies a parameterless lookup rather than suggesting any argument is needed.

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 concrete deliverable — the full list of classification values used for eligibility matching, including their meanings — which is a specific resource rather than a restatement of the name. It actively distinguishes itself from the sibling benefits_match by positioning itself as the prerequisite lookup for that tool.

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?

Explicitly names the trigger condition ('when you do not know what to put into benefits_match') and the sibling it routes against. An agent reading only this line knows exactly when to call this tool instead of benefits_match.

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