mixx_library

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

With no annotations, the description carries the full behavioral burden, yet it discloses almost nothing: 'Returns: Dict with operation result' is all. The 'load_selected' operation mutates deck state and mixes are stateful, but no side effects, permission needs, or reversibility are described.

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?

Organized with labeled sections and bulleted operations, and the core purpose is front-loaded. The repetition between the operation list and the examples adds some length but mostly earns its place.

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 detailed, and the per-operation parameter requirements cover the main invocation needs. But for an eight-mode tool with 0% param coverage and a stateful mutation mode, the lack of behavioral detail leaves real gaps.

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, and it partially does by mapping which parameter each operation requires. It still leaves track_index, the deck default, and the meaning of several enum values (e.g., get_replay_gain) unexplained.

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 names a specific resource (Mixxx library) and enumerates eight concrete operations, so an agent knows exactly what it does. It identifies itself as a portmanteau but does not differentiate from overlapping siblings like mixx_crate or mixx_history, leaving ambiguity for browsing crates.

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 states per-operation requirements ('requires query', 'requires crate', 'requires deck') and gives three invocation examples, which implies how to use each mode. However, there is no guidance on when to prefer this tool over siblings such as mixx_crate or mixx_history, so alternative-selection guidance is absent.

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