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

Annotations only supply readOnlyHint=false and a title, so the description carries most of the burden, and it does disclose a real permission constraint: an owner is blocked until ownership is transferred. It stops short of stating what happens to membership history or whether a non-member call is a no-op or an error.

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 zero filler, and the core operation is front-loaded ahead of the edge-case caveat. Nothing can be removed without losing information.

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 one-parameter mutation with no output schema and only a readOnlyHint annotation, the description covers the action, the actor, and the main blocking condition. Return behavior is the only notable gap and there is no output schema requiring explanation.

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 description coverage is 100% and the single channel_id parameter already documents its UUID format and its source tools (mIRC_list / mIRC_create). The description adds nothing beyond that, which is the expected baseline when the schema does the work.

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 ('leave') plus resource ('channel') with the acting subject ('as the current user') made explicit, so the operation is unambiguous. It does not differentiate from nearby siblings such as mIRC_delete (destroy channel) or mIRC_join (its inverse), leaving the agent to infer the boundary.

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?

Use is implied by the name and the 'as the current user' framing, but there is no explicit when-to-use statement and no named alternative (e.g. use mIRC_delete to remove the channel for everyone). The ownership condition is a precondition rather than routing guidance.

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