set_rack_chain_mixer

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

The description mentions 'Plan or apply' and 'guarded hierarchy state', which hints at a two-phase execution and state version checking, but it does not elaborate on the mechanics. It fails to disclose that a dry run returns a plan requiring a confirmationToken for apply, nor does it explain the guarded state semantics beyond the phrase. With annotations only declaring readOnlyHint=false and destructiveHint=false, the description carries the burden of explaining the mutating behavior and the plan/apply workflow, but it only partially does so.

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 sentence that is efficiently front-loaded with the primary purpose and scope. It contains no wasted words and clearly conveys the core function. However, given the tool's complexity (12 parameters, two-phase workflow), the extreme brevity leaves out essential procedural details, so it does not fully earn a 5 for structure.

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?

This is a complex tool with a dry-run/apply pattern, a guarded state version requirement, and a confirmation token flow, yet the description is only one sentence. It omits crucial information an agent needs to use the tool correctly: the necessity of first performing a dry run to obtain a planHash and confirmationToken, the requirement of expectedStateVersion, and the consequences of applying without a valid plan. With no output schema and no additional narrative, the description is inadequate for the tool's complexity.

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?

The input schema has 100% description coverage for all 12 parameters, so the schema already documents each parameter's meaning (e.g., 'Native chain volume value, not decibels'). The description adds little beyond the schema, only echoing 'native ranges' and 'guarded hierarchy state' without clarifying parameter syntax or relationships. Per the rubric, baseline is 3 when schema coverage is high and the description does not compensate with additional semantic details.

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 a specific verb ('Plan or apply'), resource ('rack-chain volume, pan, mute, solo, and send levels'), and scope ('using native ranges and guarded hierarchy state'). It unambiguously identifies this as the tool for rack-chain mixer settings, distinct from siblings like set_track_mixer or set_master_mixer, even without explicitly naming them.

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 implies usage for rack-chain mixer adjustments but does not explicitly state when to use this tool over alternatives or provide exclusions. The sibling list includes set_track_mixer, set_master_mixer, etc., but no guidance is given on choosing among them. The phrase 'guarded hierarchy state' hints at a specific workflow, but no when-to-use or when-not-to-use conditions are stated.

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