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

Annotations already declare readOnly, idempotent, and non-destructive behavior. The description adds valuable behavioral details beyond annotations: the 0-100 score range, handling of name order/nicknames/abbreviations, and the $0.01 USDC cost via x402. It does not describe potential failure modes or rate limits, but for a simple read-only API this is strong.

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?

The description is two concise sentences plus a one-sentence cost note. It front-loads the core purpose and output, then adds useful behavioral and cost information with no filler.

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 two-string tool with no output schema, the description is largely complete: it explains the input, the returned score, key normalization behaviors, and cost. The only notable gap is the lack of any distinction from the sibling interzoid_fullname_match, which could cause selection ambiguity in a crowded tool list.

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 schema has 100% description coverage with clear labels and examples for both parameters. The description adds genuinely useful parameter semantics by noting that name order, nicknames, and abbreviations are handled, implying the two name strings may be swapped or stylistically different. This goes beyond the schema's basic 'first full name' and 'second full name' definitions.

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 clearly states the tool compares two individual/person names and returns a 0-100 similarity score, naming the resource and expected output. However, it does not explicitly differentiate itself from the closely named sibling interzoid_fullname_match, so it stops short of full sibling distinction.

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 clear context: use this when comparing two individual/person names rather than addresses or companies. It also implies suitability for names with order variations, nicknames, and abbreviations. It does not explicitly name alternatives or state when not to use the tool, so it lacks explicit exclusions.

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