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

Beyond the annotations (openWorld, non-idempotent, non-destructive) it discloses required permission scopes, that the first call mutates nothing, that unknown fields are refused by name, and the exact confirm-gate contract. That is the kind of context annotations cannot express.

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?

Three tightly packed sentences, front-loaded with purpose, then permissions, then the two-call contract. No filler; each clause carries operational information.

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 non-idempotent, open-world mutation with no output schema, it covers the permission model, the confirmation handshake, and what the first call returns. The remaining gap is the undocumented `scope` parameter, which an agent cannot resolve from either schema or description.

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 only 33%: the schema documents confirm_token, which the description reinforces in context, but it says nothing about what `scope` means or accepts, and `url` is only implied. Given the low coverage the description should have compensated for `scope` and does not.

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 plus the source constraint ('from a public URL'), which implicitly separates it from import_soundcloud and get_upload_link. It never names a sibling outright, so an agent must infer the boundary rather than read it.

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 unusually precise procedural guidance: a first no-op validation call, show the summary to a human, then a second call with the same arguments plus confirm_token. It does not say when to prefer this over import_soundcloud or add_document, but the in-tool workflow guidance is explicit.

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