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

Annotations already declare destructive=true, idempotent=true and readOnly=false, so the baseline is low, yet the description adds genuinely new behavior: the song goes to an ACE Music trash recoverable only via acemusic.ai, it is unrecoverable through the API, and the call returns nothing on success. It does not cover auth or error behavior, which keeps it from a 5.

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?

Four short sentences with the consequence front-loaded and the endpoint at the end; every line carries weight. The only waste is mild redundancy between "through this API it is gone" and "Cannot be undone through the API."

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?

With one fully documented parameter, no output schema (explicitly addressed by "Returns nothing on success"), and a destructive operation whose reversibility is spelled out, the description covers everything an agent needs to call it safely.

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% and the single songId parameter is already documented in the schema with its format and provenance (finished job, acemusic_list_songs, acemusic_upload_file). The description adds no further parameter meaning, so 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 states a specific verb and resource ("Move a song to the account's ACE Music trash") and pins the operation to the exact endpoint (DELETE /music/{songId}), so an agent can distinguish it from get/download/create siblings without opening any 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?

Usage is only implied by the destructive nature of the operation; the description never says when to choose this over alternatives or which preconditions must hold (e.g., confirm with the user first, song must exist). The recovery caveat gives useful context, but no explicit when/when-not routing is provided.

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