ParquetHarmonize

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 usefully discloses the x402 payment requirement of 0.03 USDC on Base for residual schema reconciliation and notes that compatible unions are free. However, it does not disclose return-value behavior, side effects, or whether the payment is initiated automatically, leaving some behavioral uncertainty.

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?

Two tight sentences with no filler. The core purpose is front-loaded, and the key constraints and payment condition are expressed efficiently.

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?

The description covers the main input constraints and the cost/free distinction, which is essential for a tool that may require payment. However, it omits the return format, error behavior for invalid input or more than 8 files, and how the x402 payment is executed, leaving some gaps an agent would need to infer.

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?

The schema provides only a bare files_base64 string array with no parameter descriptions, so schema coverage is 0%. The description compensates by specifying that the array must contain 2-8 base64-encoded Parquet files, adding meaning well beyond the schema. It does not detail size limits or encoding edge cases, but for a single-parameter tool this is adequate.

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 'Harmonize' with a clear resource: 2-8 base64-encoded Parquet files. It further clarifies the operation by distinguishing free compatible unions from paid residual schema reconciliation, so an agent can tell what the tool does even without sibling references.

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 use case is clearly implied: use this when you need to harmonize or union multiple Parquet files. It also provides a decision-relevant distinction between free compatible unions and paid reconciliation, though it does not explicitly name exclusions or alternative tools.

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