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

Annotations cover the safety profile (readOnlyHint=false, destructiveHint=false, openWorldHint=false), so the description's task is to add context. It does add two useful facts: output fidelity is approximate, and the result is returned as a file. It says nothing about failure modes (scanned PDFs, encrypted files) or that this is a non-destructive file-producing operation, which would help an agent set expectations.

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 sentences with the core action front-loaded, zero filler, and the caveat placed immediately after the claim it qualifies.

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?

Return behavior is covered without an output schema, which is good, and the approximation caveat sets expectations. But for a conversion tool with a nested file-array input and a mode switch, the description omits what mode actually does and whether the 50 MB / 3-file limits or scanned documents are a problem, leaving meaningful gaps.

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 coverage is 100%, so the baseline applies, and "Accepts pdf" only restates what the schema already enforces. The one parameter that genuinely needs explanation, options.mode with its layout/text enum, has no description in either the schema or the tool description, so the distinction between layout preservation and text extraction is left to inference.

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 ("Turn a PDF into an editable Word document") that an agent can distinguish from word-to-pdf and pdf-to-pdfa. It does not explicitly contrast with the nearest sibling pdf-to-text, which also reads a PDF and produces a document, so the differentiation is implied rather than stated.

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 guidance on when to choose this over pdf-to-text or convert-office, and no prerequisites (e.g. the source must be a real PDF, not a scan needing OCR). The only hint of context is the "(approximation)" qualifier.

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