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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds real behavioral context beyond that: the output is in the melody format accepted by validate_melody, and access spans public/private/anonymous scopes with the claim_token path for unauthenticated saves. It does not discuss pagination or size limits, but that is minor here.

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 sentences, front-loaded with the core purpose before the access cases and id-finding hint. Dense but essentially waste-free; the parenthetical about validate_melody earns its place by linking format compatibility.

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?

An output schema exists, so return values need not be narrated. The description supplies everything else an agent needs—id sources, the anonymous-song token path, box-version scope, and output format compatibility—leaving no practical gap for a read-only getter.

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 song_id, box (including its preferred-version default), and claim_token. The description reinforces the claim_token scenario but adds no syntax or format detail beyond what the schema provides, so the baseline 3 is appropriate.

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 ('Gets a music box tune') and pins down the returned content ('its notes in the melody format ... for one box version'). It also explicitly ties the output format to the sibling validate_melody, letting an agent distinguish this from export_song or fit_melody_to_box.

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 tells the agent how to obtain the required id ('Use search_songs or list_my_songs to find song ids') and enumerates the access cases—public tunes, the signed-in user's songs, and anonymous songs via claim_token. It lacks explicit when-not guidance or a named alternative for retrieving melody data, keeping it just below a 5.

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