Set default channel

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

Annotations already declare destructiveHint=true, idempotentHint=false, and openWorldHint=true, so the safety profile is covered. The description adds nothing beyond them: it does not say the previous default is replaced, whether the setting persists across sessions or is per-user/per-workspace, or what confirmation is returned. For a mutation of persistent state, that is a real gap.

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?

One sentence, front-loaded with the verb and zero wasted words. Nothing redundant or padded.

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?

The tool is simple (one required param, output schema present, annotations cover safety), so the short description is close to sufficient. What is missing is the effect on existing state (overwriting the prior default) and the precondition that the channel be connected, both of which matter given destructiveHint=true.

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 coverage is 100% and channel_id is documented with its UC... format, so the schema carries the parameter burden. The description does add the semantic link that this parameter becomes the fallback used by other tools, but gives no constraint such as 'must be a connected channel'.

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 action and resource (set the default channel used by tools) in a single unambiguous sentence. It is clearly distinguishable from connect/disconnect/list siblings, though it never names those siblings to reinforce the contrast.

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 clause 'when channel_id is omitted' usefully explains when this setting takes effect, implying you call it to avoid passing channel_id on every later call. It gives no explicit when-not guidance, no prerequisites (e.g. the channel must already be connected), and no named alternative such as passing channel_id explicitly instead.

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