fl_set_mixer_arm

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

Annotations already establish that this is a mutating, destructive, non-idempotent operation. The description adds useful behavioral context beyond those annotations: the write is a single bounded toggle and the resulting state should be read back on a later tick. This gives the agent an important timing expectation that structured annotations do not convey.

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 extremely short, front-loaded with the core action, and contains no filler. However, the phrasing 'bounded toggle' and 'later-tick readback' is packed with domain jargon and is slightly cryptic, so the conciseness comes at some cost to immediate readability.

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 that all parameters are fully described in the schema and an output schema exists, the description does not need to document return values or parameter syntax. It supplies the key operational caveat—readback on a later tick—and the binary nature of the write. The main missing piece is broader usage context, but that is already penalized under usage guidelines.

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 the parameters are already well documented in the input schema. The description adds essentially no new parameter-level meaning; 'bounded toggle' loosely maps to the boolean armed property, but it does not enrich or explain any of the five parameters beyond what the schema provides.

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 clear operation and resource: 'Set recording arm'. The phrase 'one bounded toggle' signals a binary state change rather than a continuous adjustment, which helps distinguish it from sibling tools like fl_set_mixer_volume or fl_set_mixer_pan. It does not explicitly say 'mixer track', though the tool name and schema make that clear.

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?

There is no explicit guidance about when to use this tool versus alternatives, nor any exclusionary context. The 'later-tick readback' hint implies the caller should verify the result after a processing tick, but it does not say which read tool to use or when the concurrency guards like expected_before or session_fingerprint should be supplied.

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