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

Annotations already declare a non-read-only, idempotent, non-destructive, open-world operation, so the safety profile is known. The description adds genuinely new behavioral context: the scope is limited to the signed-in person's songs, and making a song public requires a confirmation round-trip. It stops short of describing what changes for the listener or whether toggling back is symmetric.

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?

Two tight sentences, no padding. The visibility outcome is stated first and the constraint/confirmation flow second, which is the correct front-loading for an agent that must decide before acting.

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 an output schema present, return values need not be explained, and the description covers scope, the confirmation requirement, and the two visibility states. It is nearly complete for a simple mutation, missing only auth/ownership failure behavior and song_id format at maxLength 40.

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%, so the description carries extra burden; it does explain the meaning of 'public' and reinforces the confirmed: true gate, matching the schema description for that param. However, song_id is left entirely unspecified and the description does not clarify the confirmed/visibility interaction for a private call.

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 ('Makes one of the signed-in person's songs public ... or private') and even defines what public means ('anyone can find and play it on musicboxmelodies.com'). It is clearly distinguishable from siblings like create_song, add_version, or export_song.

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 gives an explicit when-not ('Only make a song public when the person asked for it') and a concrete procedure (ask to confirm, then call again with confirmed: true). The private/public enum plus this instruction covers the decision an agent must make before calling.

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