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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds genuinely useful behavior beyond that: it returns all channels at once, ordered newest first, with no pagination – an important disclosure for a list tool that agents would otherwise assume paginates.

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?

Three sentences, each earning its place: what it returns, what a channel is/does, and which siblings depend on its output. The scoping fact (no pagination, newest first) is placed at the end where it reads as a caveat rather than burying the purpose.

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?

An output schema exists, and the description still names the salient return fields, so the agent knows both the shape and the semantics. No parameters, no destructive behavior, and full sibling routing make this complete for a zero-arg list tool.

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 tool takes zero parameters, so the baseline of 4 applies; there is no parameter semantics for the description to compensate for. The mention of target_channel_slugs refers to sibling tools rather than this tool's inputs, which is clarifying but not required.

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?

Specific verb+resource ('List the account's channels') plus the exact payload fields returned (slug, public_id, assigned user/device counts). It also explains what a channel is, and implicitly contrasts with the single-channel get_channel sibling.

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?

Explicitly states the use case: find the slug or public_id required by get_channel, update_channel, delete_channel, set_channel_users, and set_channel_devices. This routes the agent through the dependency chain rather than leaving it to infer which sibling to call first.

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