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

No annotations are provided, so the description carries the full burden. It hints at a pay-per-call model ('5 free trial calls per signed wallet'), which is useful context about auth/billing, but discloses nothing about the return shape, per-mark breakdown vs total, or behavior after the trial is exhausted.

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 purpose in a single efficient sentence. The trailing emoji/promo clause is mild filler but does not obscure the core statement.

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 counting tool with no output schema, the description should at least indicate whether it returns a total, a per-punctuation breakdown, or positions. It does none of that, and combined with the unresolved text/input parameter ambiguity, an agent lacks what it needs to call this correctly.

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% with two undocumented, non-required parameters named 'text' and 'input' that appear redundant. The description's phrase 'in text' weakly points at one of them but never resolves which parameter to use or how they interact, leaving genuine 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?

Names a specific verb (counts) and resource (punctuation), and enumerates exactly which marks are counted (periods, commas, exclamation marks, question marks, semicolons, colons). However, it does nothing to distinguish itself from close siblings like x402-strip-punctuation, x402-remove-punct, or x402-count-emoji, so no sibling differentiation credit.

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?

No statement of when to use this tool versus alternatives such as strip-punctuation or character-count, and no prerequisites or context. The only extra content is a pricing/promo note, 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.