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

With no annotations provided, the description carries the full burden. It discloses a behavioral trait—'5 free trial calls per signed wallet'—which hints at an auth/payment model. However, it omits other useful context such as return format, whether the operation is read-only, and error behavior for exceeding the trial.

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 core purpose is front-loaded in a single efficient sentence. The appended emoji and free-trial note add behavioral value without burying the main point. It is appropriately short for a simple utility tool.

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?

Given the tool's simplicity and lack of output schema or annotations, the description covers the basic function and trial limit. It still leaves notable gaps: which parameter to use, how 'text' and 'input' relate, and what the return value looks like.

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%, and there are two string parameters, 'text' and 'input', with no descriptions. The description mentions 'text' implicitly but never explains the 'input' parameter or the relationship between the two. It does not compensate for the complete lack of schema documentation.

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 states a specific verb and resource: 'Counts paragraphs in text split on blank lines.' It clarifies the counting method (blank-line splitting), which implicitly distinguishes it from the sibling x402-paragraph-split. However, it does not explicitly name or contrast with alternative sibling tools.

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 no when-to-use guidance or alternative tools. It only states what the tool does and mentions a free trial limit. An agent must infer that this tool is for counting paragraphs rather than splitting or analyzing them.

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