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 discloses a critical behavioral detail — a $0.05 USDC payment for use. However, it does not state what the tool returns, whether it modifies the input externally, or any safety implications, which matters for an action that costs money.

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 short and front-oaded: one operation clause and one cost clause. No filler. The string 'x402' is cryptic, but this is a minor issue.

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 paid tool with a single string parameter, no output schema, and no annotations, the description remains incomplete. It does not mention what the tool returns (yes, corrections), whether any system of record changes, or any technical details like supported languages. The payment note is useful, but the operational contract is unclear.

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?

With 0% schema description coverage, the description must clarify the parameter. The phrase 'corregir y editar texto' implies the input is the text to be corrected/edited, but it does not explicitly map it to the input field or explain format, length, or language. Some value is added beyond the bare schema, but it does not fully compensate.

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 clearly states a specific verb and resource: 'corregir y editar texto' (correct and edit text). This communicates the tool's purpose and is not a tautology. It is distinct enough from siblings like traduccion or resumen, though it doesn't explicitly differentiate itself.

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 provides no guidance on when to use this tool versus alternative text-processing siblings (resumen, traduccion, etc.). There are no exclusions, preconditions, or explicit selection criteria, leaving the agent to infer use case from the tool's name and purpose alone.

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