set_crossfade_assign

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

No annotations are provided, so the description carries the burden of behavioral disclosure. It explains the meaning of assignment values (0, 1, 2) and that track_index is zero-based, which clarifies the tool's effect. However, it does not mention potential errors, side effects, or whether the operation is reversible. For a simple setter, this is adequate but not rich.

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 concise and well-structured. It opens with a clear one-sentence purpose, followed by a neatly formatted Args block. Every sentence adds value, and there is no redundant information. It is appropriately sized for the tool's simplicity.

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?

For a simple two-parameter setter, the description is largely complete. It covers the purpose and parameter semantics thoroughly. It lacks explicit usage context and error handling, but these are not critical for a basic mutation tool, especially since an output schema presumably exists. The description provides enough to use the tool correctly.

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%, and the description fully compensates by explaining both parameters in detail. It specifies that track_index is zero-based and enumerates the exact meaning of assignment values (0 = none, 1 = A, 2 = B). This goes well beyond the bare schema, providing essential semantic information.

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 the tool's function: 'Set the crossfade assignment of a track.' This is a specific verb+resource combination that distinguishes it from sibling track-related setters like set_track_volume or set_track_pan. The naming and description unambiguously identify the tool's role.

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?

No explicit usage context or alternatives are provided. The description implies when to use the tool (when a track's crossfade assignment needs to be changed) but does not discuss prerequisites or contrast with other tools. It's minimally adequate but lacks clear guidance for an agent to know exactly when this tool is the right choice.

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