x402_convert_file

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

Excellent disclosure given zero annotations. Details cost model, file size limits (10MB input, 8MB output), authentication requirements, output formats (base64-encoded bytes vs JSON array), and specific behavioral caveats ('content-fidelity not layout-preserving' for DOCX). Explains that free test mode returns fixture data rather than actual conversions.

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?

Well-structured with clear sections (purpose, pricing, supported conversions, limits, auth, returns). Uses bullet points effectively for the four conversion types. Slightly verbose but appropriate for the complexity of four distinct conversion pipelines. Every sentence conveys necessary information about cost, limits, or behavior.

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?

Comprehensive coverage compensates fully for lack of annotations and output schema. Describes return values (base64 bytes with MIME type or JSON), error conditions (size limits), authentication modes, and implementation specifics for each conversion type. Complete enough for an agent to predict outcomes and handle responses without an output schema.

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 100% schema coverage, baseline is 3. Description adds valuable constraints not in schema: 10MB source limit, 8MB output limit, base64 encoding of outputs, and implicit parameter relationships (format/width/height only relevant to image type). Enhances understanding of what the 'url' parameter expects (public, http/https).

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?

Description opens with specific verb ('Convert') and resources ('files between formats'), explicitly listing supported conversions (image resize/reformat, CSV to JSON, HTML to PDF, DOCX to PDF). Clearly distinguishes from sibling tools like x402_scrape_url or x402_screenshot by focusing on file format transformation rather than data extraction or capture.

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?

Provides clear prerequisites (X402_PRIVATE_KEY for paid mode, public HTTP/HTTPS URLs) and cost structure ($0.02 USDC vs free test endpoint). While it doesn't explicitly contrast with sibling tools, the distinct conversion focus and pricing disclosure provide sufficient context for selection. Could improve by explicitly stating when to use this versus x402_pdf_extract or x402_screenshot.

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