set_submix_effect_settings

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

Annotations establish the safety profile (readOnly=false, idempotent=true, destructive=true), so the bar is lower. The description still adds real behavioral context: reflection-based editing, a partial merge where absent keys are untouched, and value clamping, which meaningfully qualifies the destructive hint.

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?

Two compact sentences with the action front-loaded and the return shape second. Nothing is padded; the return block earns its place because there is no output schema to convey it.

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 3-parameter mutation tool, the description covers purpose, mechanism, merge semantics, and the return shape (compensating for the missing output schema), while annotations carry the safety profile and the schema documents every parameter. The only thin spot is the absence of permission/prerequisite context.

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 100%, so all three parameters are already documented, including the effect_index ordering relative to add_submix_effect_to_chain. The description only echoes 'by chain index' and adds no syntax or format detail beyond the schema, so the baseline of 3 applies.

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?

States a specific verb (configure) and a precise resource (a submix effect preset's Settings struct), plus the mechanism (by chain index, via reflection). It is clear what the tool does, though it never names a sibling alternative to differentiate itself from add_submix_effect_to_chain or get_submix_effect_chain.

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 explains how the tool behaves (partial merge + clamp) but never says when to reach for it versus the sibling tools that add effects to or read the effect chain. There is no when-to-use, when-not-to-use, or prerequisite guidance; usage must be inferred entirely from the name.

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