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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds important non-annotation context: the tool costs $0.02 (20000 atomic USDC on Base) and pays via x402, which is critical behavioral information for an agent deciding whether and how to call it.

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 three short sentences: the purpose is front-loaded, followed by the exact style list and payment details. Every sentence contributes useful 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 rewrite tool with no output schema, full schema descriptions, and annotations covering safety and openness, the description supplies the core purpose, style options, and payment model. It could be slightly more complete by mentioning the related writing_grade sibling or expected return shape, but nothing essential for calling the tool is missing.

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 100%, so the schema already documents the text/style parameters, aliases, enum values, and the 4000-character limit. The description lists the style names, but this merely duplicates the enum and does not add syntax, format, or selection guidance beyond the schema.

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 uses a specific verb and resource: 'Rewrite text into a named style,' and enumerates the available styles. It is clear what the tool does, but it does not differentiate itself from the related sibling writing_grade, which an agent might otherwise confuse with a writing-transformation tool.

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 explicit guidance on when to use this tool versus alternatives, nor any exclusions or prerequisites beyond the payment note. The payment requirement is useful context, but usage selection is left entirely to inference from the purpose statement.

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