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

With no annotations, the description carries the full behavioral burden. It discloses the useful architectural fact that uploads go directly to R2 via a presigned URL, but omits URL expiry, accepted audio formats, any filename constraints, and whether the caller must follow up with upload_audio. Those are the traits that determine correct invocation.

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?

A single tight sentence with the key mechanism front-loaded and no filler. It is appropriately sized, though brevity here partly reflects under-specification rather than economy.

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, no annotations, and a mutation-adjacent tool, yet the description does not say what the response contains (bare URL string, object key, expiry field) or how it connects to upload_audio. For this complexity level the definition leaves too much 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?

One parameter at 0% schema description coverage, so the description must compensate and does not. It says nothing about whether filename needs an extension, a specific format, a path prefix, or a uniqueness constraint.

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 (get) and resource (a presigned upload URL) plus the mechanism and destination (direct to R2 storage). This is clear on its own, but it never names the closely related siblings upload_audio or submit_separation, so an agent must infer the sequencing between them.

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?

No statement of when to call this versus upload_audio, no prerequisites, and no ordering guidance. The existence of an upload_audio sibling makes the missing relationship the single most important thing an agent needs here, and it is absent.

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