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

With no annotations, the description carries the full burden, and it does disclose two useful behavioral facts: the k-anonymity SHA-1 prefix approach (privacy-preserving, no full hash sent) and a metered quota per signed wallet. It omits return format, error behavior, and what a positive/negative result looks like.

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?

Single front-loaded sentence stating purpose, mechanism, and pricing with no padding. The emoji is noise but minor; overall efficient.

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?

No output schema, no annotations, and three entirely undocumented parameters. For a security-check tool where result interpretation (is the password leaked? how many times?) matters, the description leaves the essential contract unspecified.

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 coverage is 0% and the description never mentions parameters. With three overlapping, undocumented string inputs (text, input, password) and zero required fields, an agent cannot tell which argument the tool actually consumes; the description does nothing to resolve this ambiguity.

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 verb and resource ('Checks a password against the Pwned Passwords k-anonymity range API'), which is far more concrete than a tautology and clearly differentiates a breach-check from lookalike siblings like x402-password-strength or x402-password-entropy. It stops short of explicitly naming those alternatives, so it lacks full sibling differentiation.

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?

There is no guidance on when to reach for this tool versus x402-password-strength, x402-password-entropy, or x402-haveibeenpwned. The only contextual note is a pricing/quota statement ('5 free trial calls per signed wallet'), which is not usage guidance.

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