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

With no annotations, the description carries the full burden, and it does disclose the two concrete effects of ignoring plus the reversal semantics. It omits other behavioral facts an agent would want: whether the setting persists across sessions, what happens for an unknown nick, and whether the call is idempotent.

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 short sentences with no filler, and the core effect is front-loaded before the toggle detail. The 'on=false' fragment is slightly cryptic in isolation but the surrounding text makes it readable.

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 two-parameter, no-output-schema tool this is close to adequate, but the missing default for 'on' and the absence of any error or persistence behavior leave real gaps. A single added clause about the default would make it complete.

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 0%, so the description must compensate. It explains the meaning of 'on' only partially ('on=false stops ignoring') and never states the default when 'on' is omitted, which is the main ambiguity for a one-required-parameter toggle. 'nick' is left to be inferred from the word alone.

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?

The description gives a specific verb ('ignore') and resource ('a nick') and then spells out the concrete effect: lines are hidden and private messages are blocked. That is well beyond a restatement of the name. It does not explicitly contrast with adjacent moderation tools such as 'ban', so it stops short of 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?

Usage is implied rather than stated: 'on=false stops ignoring' tells the agent how to reverse the action, which is a useful toggle hint. There is no guidance on when to prefer this over 'ban' or 'mod', nor any prerequisite (e.g. whether the nick must exist or be visible to you).

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