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

Annotations supply only readOnlyHint=false, so the description carries real weight: it discloses that the call is confirm-gated and previews until confirm:true, and that nothing is logged. However the confirm/preview behavior is already fully spelled out in the confirm parameter's schema description, so the marginal value is limited to the 'as-is, nothing to log' framing.

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 compact clauses, front-loaded with the action and constraint, with the confirm gate appended in parentheses. No filler.

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 mutation with nested required fields and no output schema, the description covers the write semantics and the confirmation gate but says nothing about what a successful call returns (e.g. created plan id) or how optional endDate/fileName/description behave.

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?

At 50% schema coverage the schema documents only s3Key and clientId; the description adds no semantics for kind, title, startDate, endDate, fileName, or description, and simply restates the upload_file key origin. Adequate but not compensating for the coverage gap.

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 ('assign') and resource ('an uploaded PDF ... as a client's workout or diet plan'), with 'as-is' sharply distinguishing it from conversion-style siblings like convert_pdf_plan. It never names a sibling outright, so an agent still has to infer the boundary rather than being told.

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 'key from upload_file' parenthetical implies the prerequisite flow and 'as-is — nothing to log' hints the PDF is already parseable, but there is no explicit when-to/ when-not versus convert_pdf_plan, share_pdf_plan_from_import, or create_workout_plan.

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