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

Annotations already declare non-read-only, idempotent, non-destructive, open-world, so the safety profile is covered. The description adds genuinely non-derivable behavior: a 15-minute expiry window and strict enforcement of exact size and content type, plus an email-verification prerequisite and version pinning. What is missing is the failure behavior on version conflict or expiry.

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?

One dense sentence, front-loaded with the verb and resource, with no filler. The stacked 'exact-size and exact-content-type' phrasing is compact but slightly awkward; nothing is wasted, though nothing is unpacked either.

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 values need not be explained, and annotations cover the safety profile. But for a seven-parameter, all-required tool with no schema descriptions, the definition leaves the identity and role of sessionToken, contextKey, and idempotencyKey unexplained, and gives no guidance on retry or conflict handling.

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% across seven required parameters, so the description carries the burden and only partially meets it: it conveys that expectedVersion must be the exact current version, mimeType/sizeBytes must match exactly, and that a verified session is involved. It never maps these constraints to parameter names, and contextKey, fileName, and idempotencyKey semantics go unaddressed.

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 (Create) plus a precisely characterized resource (a signed upload form), with scoping qualifiers — 15-minute lifetime, exact size/content type, one email-verified application, current version. This implicitly separates it from applications.upload_document and complete_document_upload, though neither sibling is named, so the agent must still infer which step of the flow this is.

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 preconditions (email-verified application, exact current version, exact size and MIME type) hint strongly at when the tool is valid, but there is no explicit statement of when to use this versus applications.upload_document or complete_document_upload, and no stated two-step flow. Usage is inferable rather than instructed.

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