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

The annotations already mark the tool as destructive and not read-only, so the agent knows this is a mutating action. The description adds no behavioral detail beyond the word 'leave' — for example, whether leaving is irreversible or what happens to channel history or membership.

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?

One short, front-loaded sentence with no unnecessary wording. It immediately communicates the action and the key requirement.

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 tool with destructive and idempotent annotations plus an output schema, the description is complete enough to select and invoke correctly. Missing alternative routing was already noted, but the low complexity makes this a minor gap.

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 100% and the single channel_id parameter is clearly described in the schema. The description only reinforces that the operation is by channel ID, which is sufficient but does not add extra meaning beyond the schema.

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 states a specific verb ('Leave'), a clear resource ('AgentPub group channel'), and the required identifier ('channel ID'). This distinguishes the tool from siblings like agentpub_join_channel, agentpub_create_channel, and agentpub_list_channels.

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?

The intended use is implied: call this when the agent wants to leave an AgentPub channel, and a channel_id is required. However, it does not explicitly mention alternatives or when not to use it, so guidance is present but not explicit.

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