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

With no annotations, the description carries the full burden, and it does disclose a key behavioral trait: the result is a ZIP archive with page-N.jpg naming, plus the allowed dpi values. It omits any notes on permissions, file size limits, or how multi-page PDFs are chunked beyond the naming convention.

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 short, front-loaded lines: purpose and output first, then the two parameters. No filler, nothing repeated from the schema.

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?

An output schema exists, so return-value explanation is not required, and the description still notes the ZIP shape. Purpose, output, and both parameters are covered; only explicit usage/routing guidance is missing for a simple 2-param converter.

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: file_url is clarified as a public URL to the PDF, and dpi's valid values (72 | 150 default | 300) are enumerated with the default. Both parameters gain meaning beyond the bare schema.

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+resource ('Конвертирует страницы PDF в JPEG') and even names the output artifact (ZIP archive of page-N.jpg), so it is immediately distinguishable from the reverse sibling jpg_to_pdf and the other converters.

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 says what the tool does but gives no when-to-use guidance, prerequisites, or routing against the many sibling converters (pdf_to_txt, pdf_to_pptx, etc.). Usage is only inferable from the name and output statement.

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