agent_join_channel

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

No annotations are provided, so the description bears full responsibility for behavioral disclosure. It only mentions that the channel is encrypted and the purpose, but does not describe side effects (e.g., whether joining triggers notifications), idempotency, or required permissions. This is insufficient for a mutation tool.

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 sentence with no wasted words, making it concise and easy to parse. However, it lacks structural elements like bullet points or emphasis, and could benefit from additional brevity without sacrificing clarity.

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 simple tool with only two parameters and no output schema, the description provides the essential purpose. However, it does not explain what happens after joining (e.g., response or result), and given the density of related sibling tools, more context would be helpful for an AI agent to use it correctly.

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 already provides descriptions for both parameters (api_key and channel_id) with 100% coverage. The tool description adds no additional meaning or context to these parameters, so the baseline score of 3 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 the action ('Join') and the resource ('encrypted channel'), and explains the purpose ('to read and post messages'). However, it does not differentiate from sibling tools like agent_read_channel or agent_post_to_channel, which are related but distinct actions.

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 that joining is a prerequisite for reading and posting, but it does not specify when to use this tool versus alternative tools such as agent_create_channel or agent_invite_to_channel. There is no mention of prerequisites or context.

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