join_chat

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

No annotations provided. The description implies a non-destructive join action but lacks details on permissions or prerequisites. For a straightforward join, it is adequate but not exhaustive.

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, front-loaded sentence that conveys the purpose with zero wasted words.

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 description covers the essential use case. With an output schema present, it does not need to explain return values. However, it lacks information on error handling or prerequisites.

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 0%, so the description must compensate. It adds context that the 'chat' parameter can be a public group/channel or an invite link, but does not specify format (e.g., '@username' vs. 't.me/+...').

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 ('public group/channel' or via invite link). It distinguishes from sibling tools like leave_chat and create_group.

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 covers two use cases: joining public groups/channels or via invite link. It does not explicitly state when not to use, but the context from sibling tools implies alternatives.

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