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

Annotations already establish idempotency and non-destructiveness. The description adds the meaningful behavioral trait of being a 'single verifiable transaction,' implying atomicity and some form of result verification. This goes beyond the annotations, though it remains somewhat vague about rollback behavior or what 'verifiable' means in practice.

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?

The description is a single, concise sentence that front-loads the key action and parameters. Every word earns its place, with no filler or redundant content.

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?

Given the batch nature and transactional aspect, the description is minimal but sufficient for a simple tool with an output schema. However, it lacks usage context, error handling details, and a clear statement of the batch scope across multiple items, which leaves some gaps for an agent selecting the tool.

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%, so the description must compensate. It mentions volume, pan, and mute, which map to the TrackMixItem fields (volume_db, pan, muted), but it does not explain the items array structure, project_ref, ranges, or defaults. The schema field names are self-explanatory, so the description adds only marginal semantic value beyond the schema.

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 clearly states that the tool applies volume, pan, and mute, using the specific verb 'aplica' and naming the exact mix parameters. It distinguishes from sibling tools (set_track_pan, set_track_volume, set_track_mute) by emphasizing a single transaction, but it does not explicitly mention 'tracks' or 'batch' within the description text, relying partly on the tool name.

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?

The description provides no guidance on when to use this tool versus the individual set_track_* siblings, nor does it mention any prerequisites or scenarios. It only states what it does, leaving the agent to infer appropriate usage from the name and schema.

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