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, yet it discloses only the output format. It says nothing about file size limits, conversion latency/async behavior, failure modes (e.g. scanned/non-text PDFs), or whether the output is returned as a URL or inline, which matters for a conversion 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?

Two short lines, front-loaded with the action and output format, and the parameter note follows immediately. No wasted words, though the note is terse enough to border on under-specification.

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 single-parameter conversion tool with an output schema present, the description covers the purpose and the one input's required nature, which is nearly sufficient. The gap is the absence of any behavioral caveats around failure or output handling, but returns need not be explained given the 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 schema description coverage at 0%, the description is the only source of parameter meaning, and it does supply it: file_url is a 'публичный URL PDF-файла' (a public URL, not a local path or upload ID). That constraint is genuinely useful beyond the bare string type in the 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?

Specific verb+resource conversion ('Конвертирует PDF в редактируемый Word-документ') with the output format (.docx) named explicitly, which cleanly separates it from siblings like pdf_to_txt or pdf_to_pptx. It never names a sibling (e.g. word_to_pdf as the reverse operation) for differentiation, 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, no prerequisites, and no reference to alternative conversion tools. The agent is left to infer usage entirely from the purpose statement.

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