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

Annotations declare readOnlyHint=false, destructiveHint=false, openWorldHint=false, so the mutation/safety profile is already covered. The description adds only 'Returns the result file', without saying whether the output is a new OCR'd PDF with a text layer, whether the file size/quality changes, or how long OCR takes on large documents.

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 sentences, front-loaded with the purpose and followed by the input constraint. The closing sentence 'Returns the result file' is thin but not wasteful.

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?

There is no output schema, so the description must carry the return-value burden; 'Returns the result file' is too vague about format and naming. With a nested, required-array input plus an undocumented language option, the definition is adequate but leaves real 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 description coverage is 100%, so the baseline is 3. The description adds nothing about the parameters, and notably never mentions the 'options.language' enum (both/deu/eng), which has no per-value documentation 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?

States a specific verb and resource: 'Make scanned PDFs searchable and copyable with text recognition', plus an explicit input constraint ('Accepts pdf'). It is clearly distinct from ocr-image by virtue of the PDF-only scope, though the description never names that sibling to reinforce the boundary.

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?

'Make scanned PDFs searchable' implies the input must be a scanned/image-only PDF, which is useful implied guidance. However, it gives no exclusions (e.g., don't use on already-text PDFs) and no routing toward ocr-image or pdf-to-text for adjacent needs.

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