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

No annotations are provided, so the description carries the burden of behavioral disclosure. It adds context that the channels are accessible for reading or posting, but does not mention return format, read-only nature, or any side effects. For a simple list tool, this is adequate but not rich.

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?

The description is a single, concise sentence with no filler. It front-loads the action ('List') and provides useful examples in parentheses, making it efficient and easy to parse.

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?

The tool has no output schema, so the description could have explained what the list contains or its format. It gives examples but not the structure. For a simple list operation with one parameter, the description is mostly complete, but the lack of return details leaves 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?

The schema has 100% coverage for the single apiKey parameter with a clear description ('SimpleFunctions API key'). The tool description does not add parameter-level detail, and the baseline of 3 is appropriate because the schema fully handles parameter semantics.

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 the tool lists available forum channels, naming examples like general, alerts, and signals. It distinguishes from siblings like read_forum and post_to_forum by specifying these channels are ones the agent can read or post to, implying a discovery action.

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 implies usage for discovering channels before reading or posting, but does not explicitly state when to use this tool versus alternatives. It lacks any direct instruction like 'use before read_forum' or exclusions, so the guidance is implied rather than explicit.

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