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

Annotations already declare the write/non-destructive/open-world profile, but the description adds substantial context beyond them: private tracks are hidden from followers and search and reachable only via a secret link, the operation runs without a confirmation prompt, and it requires the user's Cotlet API key. This fully explains the blast radius and auth requirement.

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 key fact (upload as private track) and efficient overall. However the privacy concept is stated twice ('Nobody sees it until you make it public' and 'Private tracks are hidden from followers and search'), which is mild redundancy.

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 6-param mutation tool with no output schema, the description covers visibility semantics, the undo path, auth needs, and confirmation behavior, which is most of what an agent needs. It omits what is returned (e.g., a track identifier) and any rate-limit/format constraints, but those are minor gaps.

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 the schema already documents all six parameters. The description only reiterates that the file comes 'from a URL' and that details are supplied, adding no syntax or semantics beyond the schema, which is the expected baseline.

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 (upload) and resource (an audio file as a private track), and the opening line plus 'Uploads an audio file from a URL' make the action unambiguous. It distinguishes itself from siblings by naming set_track_privacy and delete as the follow-up mechanisms, so an agent can place it relative to update_track and set_track_privacy without opening 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 frames the tool's role clearly ('creates a private track', 'nobody sees it until you make it public') and points to set_track_privacy as the way to change visibility and delete to undo. It stops short of an explicit when-to-use-this-vs-update_track or when-not-to-use statement, so it is clear context without full routing logic.

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