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

With no annotations, the description still discloses the return shape ("returns indented text") and the payment model (5 free trial calls per signed wallet), which is useful context an agent would otherwise not have. It does not state a default when the indent count is omitted, nor what happens with empty or missing text.

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 operation and its inputs are front-loaded in the first clause, and the return/price details follow compactly. The free-trial promo is supplementary but short enough not to bury the primary information.

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 four-parameter, non-annotated, schema-undocumented tool with no output schema, the description covers the basic contract but leaves the text/input alias ambiguity and the default spacing behavior unresolved. An agent could call it, but not confidently with only partial arguments.

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%, so the description carries real weight: it clarifies that "spaces" and "n" both denote a count of spaces despite being typed as strings, and that text is the input. It leaves unexplained the fourth parameter "input" and whether it is an alias of "text" or takes precedence.

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 ("Indent each line of text") plus the mechanism ("by a number of spaces"), so the operation is unambiguous. It does not, however, distinguish itself from near-identical siblings such as x402-indent-lines, x402-text-indent, or x402-text-pad.

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 pick this tool over the several overlapping siblings (x402-indent-lines, x402-text-indent) or the inverse tools (x402-dedent, x402-dedent-lines). The only usage-adjacent statement is what inputs to provide, not when the tool is the right choice.

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