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 does add genuinely useful behavior beyond the schema: the x402 pay-per-use cost of 0.04 USDC on Base, which an agent needs before invoking. However, it never states what output format the tables come back in, whether auth/wallet is required, or any size/rate limits, which are significant gaps for a paid extraction tool.

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?

Three terse fragments with zero waste; purpose first, then the parameter binding, then the pricing note. Front-loaded and efficiently sized for a single-parameter utility.

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?

With no annotations and no output schema, the description should carry more of the return-format and prerequisite burden. It covers purpose, the input value, and cost, but leaves the shape of the extracted tables and any wallet/payment prerequisites unspecified.

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 single parameter's schema description is the generic placeholder 'service input', so the description's 'input=URL del PDF' is the only real semantic clarification and it is necessary and correct. It tells the agent the expected value type is a PDF URL, though it offers no URL format examples or constraints.

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?

Names a specific verb (Extrae) and resource (tablas de un PDF) plus the source mechanism (por URL), so the agent knows exactly what it does. It does not name or differentiate from near-neighbors like ocr-tables, vision-tables or leer-pdf, so it stops short of a 5.

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?

No when-to-use guidance and no mention of alternatives, despite several sibling tools that also extract tables (ocr-tables, destilar-tables, vision-tables) or read PDFs (leer-pdf, read-pdf). The agent must infer the routing decision entirely on its own.

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