rejoin_group

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action is 'Rejoin,' implying a mutation, but doesn't cover permissions required, rate limits, error conditions (e.g., if the group no longer exists or if the user wasn't previously a member), or what the response looks like. This leaves significant gaps 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 front-loaded with the core purpose in the first sentence, followed by a concise parameter explanation. It avoids unnecessary details, but the 'Args' section could be integrated more smoothly rather than as a separate block.

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 the complexity of a mutation tool with no annotations and no output schema, the description is insufficient. It lacks information on permissions, error handling, return values, and how it differs from similar tools like 'join_group.' This makes it incomplete for safe and effective use by an AI agent.

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 description includes an 'Args' section that explains 'group_id' as 'The ID of the group to rejoin,' adding meaningful context beyond the schema (which has 0% description coverage and only provides a title 'Group Id'). This compensates well for the low schema coverage, though it doesn't detail format or validation rules.

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 ('Rejoin') and resource ('a group you previously left'), making the purpose immediately understandable. However, it doesn't explicitly differentiate from sibling tools like 'join_group' (which might be for initial joining) or 'update_membership' (which could handle various membership changes).

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 provides minimal guidance by mentioning 'a group you previously left,' which implies a prerequisite condition. However, it doesn't specify when to use this tool versus alternatives like 'join_group' or 'update_membership,' nor does it mention any exclusions or edge cases.

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