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

Annotations already flag write/destructive/non-idempotent, and the description adds substantial context beyond them: the operation is queued, a worker downloads serially oldest-first, the merchant is notified, and the return includes both queued rows and rejected URLs. The gap is that with destructiveHint=true, it never says what is destroyed or whether an existing file at the same path/file_name is overwritten.

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?

Front-loaded with the [write, queued] marker, then constraints, then async behavior, then return shape and follow-up tool. The extension list and size cap are verbose but each is load-bearing for a validation-heavy tool.

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?

No output schema exists, and the description compensates by describing the return (queued storages_remote_upload_id rows plus rejected URLs) and the async follow-up path. It is nearly complete; only the overwrite/collision behavior implied by destructiveHint is left unstated.

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 0%, so the description must carry the load and it does: path is the folder with empty meaning zone root, urls is capped at 20, file_name only applies when exactly one URL is given (otherwise the URL's own filename wins), and the two account identifiers are presented as alternatives. That is more than the bare schema conveys.

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 — add files to a storage account — and immediately distinguishes the mechanism: 'from public https URLs instead of uploading bytes.' An agent can tell this apart from upload/create-folder siblings without opening the schema.

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?

Gives explicit entry conditions (public https URLs only, not byte uploads), hard limits (max 20 URLs, 100 MiB each, enumerated allowed extensions), and routes the agent to list_storage_remote_files for progress tracking. Effectively an exclusion list as well as a use case.

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