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

Annotations only declare a non-read-only, non-idempotent, non-destructive operation. The description adds real behavior: 20 GB cap (5 GB through the browser link), that the conversion launch is triggered by output_format at upload time rather than a later call, and that convert will block waiting for the bytes. That is substantive beyond the annotation set.

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 decision rule and dense with useful facts per sentence; the only cost is the long em-dash-clause sentences that sprawl slightly. Nothing is filler, but a little tightening would help scanning.

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 carries the return-value burden and does: import_id plus two delivery options, with guidance on which to prefer. Combined with the size limits and the convert follow-up, an agent has everything needed to call this correctly.

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 filename, input_format and output_format are already documented. The description restates the meaning of output_format (it drives automatic conversion), which reinforces the schema rather than adding format syntax or constraints the schema lacks. Baseline 3 applies.

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?

The description opens with a specific verb and object ('Get somewhere to put a local file') and immediately states the distinguishing scope ('ANY file that is not already at a URL'), which separates it from convert, get_job and list_formats without the agent needing to open a 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?

It names the condition that selects this tool (file not already at a URL), which of the two delivery paths to use depending on network reach to convert.online/storage, and the required follow-up call to convert. When-to-use, how-to-choose and what-comes-next are all explicit.

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