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

No annotations are provided, so the description carries the burden. It adds 'No auth needed,' which is a useful behavioral trait. However, it does not disclose other traits like rate limits, whether it returns all channels globally or user-specific, or if any side effects exist. It minimally covers the required disclosure.

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 sentences, zero waste. Every word earns its place: the first states the core action, the second provides a key condition. Exemplary conciseness.

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?

Given no parameters, no output schema, and a simple listing task, the description is nearly complete. It tells the agent the tool lists channels without authentication. However, it could clarify what 'available channels' means (e.g., public channels) to fully remove ambiguity, but it's adequate for a simple tool.

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 input schema has 0 parameters, so schema coverage is 100%. The description does not need to add parameter details since none exist. The baseline of 4 is appropriate.

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 clearly states 'List available channels.' This is a specific verb+resource, and it distinguishes from siblings like get_channel_messages (retrieves specific channel messages) and post_channel_message (sends to a channel).

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 description mentions 'No auth needed,' which is a precondition for use, but it does not explicitly state when to use this tool versus other list tools (e.g., list_claims, list_feed) or provide exclusions. Usage is implied but not clearly delineated.

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