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

Goes well beyond the destructiveHint=true annotation: it discloses that the key is freed for reuse, that the oldest remaining channel is promoted when the default is removed, that Slack moderation must be cleared first, and that channels:write is required. These are exactly the side effects and auth requirements an agent needs before an irreversible call.

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?

Dense and front-loaded: consequences, default-promotion behavior, prerequisite, and permission in four tight sentences. The opening repeats the title and then restates "Delete a channel" as the first sentence, which is a small redundancy.

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?

With no output schema and annotations already covering the read-only/destructive profile, the description supplies the missing pieces — side effects, prerequisite, and permission scope — so nothing an agent needs before invoking a destructive delete is absent.

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 single nested `request.id` parameter is not mentioned in the description at all; the schema itself carries only a bare "The ID of the channel." label. Since there is only one parameter and the schema names it adequately, this is a minor gap, but the description adds no meaning about identifier source or format.

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 and resource ("Delete a channel") that is unmistakable against siblings like channels-update, channels-duplicate, and channels-retrieve. The follow-on sentences reinforce the scope by describing the exact consequences of deletion rather than restating the name.

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?

Gives a concrete precondition — a channel still moderating a Slack workspace must be disconnected first — which tells the agent when the call will fail. It does not explicitly route to alternatives, but for a destructive terminal operation the sibling set (update vs duplicate vs delete) makes the choice obvious.

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