set_channel

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

With no annotations, the description carries the full load and does well: it discloses patch semantics ('Only the fields given change'), numeric ranges (volume 0..1, pan -1..1), pitch units in cents, color format '#rrggbb', and the non-obvious meaning of enabled=False (mutes). It stops short of stating error behavior for an invalid channel id or whether the change is undoable via the undo sibling.

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?

A single dense sentence with the resource and id up front, followed by the field list and the trailing patch-semantics guarantee. Parenthetical annotations are compact, though the packed field list reads slightly like a schema echo.

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 an 8-parameter mutation tool with no annotations and no output schema, the definition covers the input side well but says nothing about the return value, failure modes, or side effects. An agent can invoke it correctly but cannot predict the outcome of a bad channel id.

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 does for 7 of 8 parameters with units and ranges the bare schema lacks. Only 'name' goes undocumented, and channel is only glossed as '(an id)' with no hint about how to discover valid ids.

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 ('Change') and resource (channel by id) and enumerates exactly which fields are settable, so an agent knows this is the channel-property setter rather than a pattern, mixer, or plugin tool. It does not explicitly contrast itself with near-neighbors like set_mixer_track, keeping it below a 5.

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 guidance on when to call this versus alternatives such as add_channel, delete_channel, or set_mixer_track, nor any stated prerequisites (e.g. the channel must already exist). The only usage-adjacent statement is the patch-semantics note, which is behavioral rather than routing guidance.

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