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

Annotations already declare write (readOnlyHint=false), idempotent, and non-destructive. The description adds a real behavioral fact beyond them: 'No charge', i.e. accepting incurs no credit cost, which matters in a billing-aware API. It still doesn't state whether the commit is reversible or what happens to the prior version, but the cost disclosure is meaningful added context.

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 terse sentences with zero filler, and the core action is front-loaded ahead of the prerequisite and cost. Every sentence carries distinct 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?

An output schema exists, so return values need not be described. But for a mutation tool with 0% parameter documentation, the description omits where generation_id comes from, whether acceptance can be undone, and how idempotency_key should be sourced – gaps an agent would need filled.

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 0% for 2 parameters, so the description carries the full explanatory burden and fails to. It never says what 'generation_id' refers to (presumably from a prior generate/quote step) nor explains the purpose/format of 'idempotency_key'. With zero coverage this is a clear shortfall.

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 action on a specific resource: adopting a generated version into the finished song ('Use this generated version in the finished song'). It clearly separates this commit step from generation itself, implying it belongs to a generation workflow. It does not, however, name or contrast with any sibling (e.g. cancel_batch, generate_changes) to further sharpen selection.

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?

'Preview/approve first' establishes a prerequisite ordering, which is genuine usage guidance. However, it does not name alternatives or when-not conditions (e.g. how to discard/reject a generation instead), so routing between this and related tools is left to inference.

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