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

No annotations are provided, so the description carries the full behavioral burden. It discloses only that it returns table rows; it says nothing about authentication needs, page or size limits, whether scanned/OCR-only PDFs are supported, or how the result is structured or paginated.

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 opening sentence is front-loaded and delivers the core behavior immediately, and the Args block is terse with no filler. The Args list restates the schema's parameter names, which is mildly redundant but earns its place given zero schema description coverage.

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 two-parameter read tool with no output schema and no annotations, the description covers inputs adequately but leaves output shape (row/column representation, multi-table handling) and failure modes unaddressed. It is the minimum viable definition rather than a complete one.

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 0%, so the description must compensate, and it does: "fuente" is documented as either a public URL or base64-encoded content, and "paginas" as an optional range with the example format `1-5,9` and the default of all pages. Both parameters gain meaning beyond the bare schema titles.

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?

States a specific verb and resource: "Detecta las tablas del PDF y devuelve sus filas", which clearly separates it from pure text-extraction siblings like pdf_texto or pdf_markdown in intent. It does not name any sibling explicitly, so an agent must infer the boundary from the word "tablas".

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 when-to-use guidance, no prerequisites, and no mention of alternatives such as pdf_texto or ocr for scanned documents. The only conditional statement ("Sin valor, todas") concerns a parameter default, not tool selection.

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