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

With no annotations, the description carries the full burden and does disclose two useful traits: the privilege requirement and the read/write denial effect. The key 'registered channel' qualifier implies bans fail outside registered channels, but durability (permanent vs temporary), reversibility, and whether the target is kicked or merely restricted are all left unstated.

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?

Two tight clauses with the effect front-loaded and the permission gate appended where it cannot be missed. Nothing is redundant; the trailing 'Operators only.' fragment is slightly clipped but still clear.

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 a privileged mutation with no annotations and no output schema, the description covers what happens and who may do it, which is the minimum an agent needs to attempt the call. It stops short of the details that matter for a destructive privilege operation: permanence, undo path, and what failure looks like on an unregistered channel.

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 50% — only channel is documented, and the description adds the important constraint that the channel must be registered, which the schema's '#general (the default)' note does not say. For nick, it never clarifies accepted form (nickname vs registered account vs identifier), so half the parameter space remains unexplained.

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?

Names a specific verb (ban) and resource (a nick in a channel) and states the concrete effect: the nick can no longer read or write there. It does not differentiate itself from adjacent moderation siblings such as ignore, demod, deop or mod, so an agent still has to infer the boundary, but the core action is unambiguous.

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?

Adds a real precondition — 'Operators only' — which tells the agent the caller must hold elevated privileges. It gives no explicit when-to-use or when-not-to-use guidance and never mentions an unban counterpart or an alternative (e.g. ignore) for lesser cases, so routing remains implied rather than stated.

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