Join Circle

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

No annotations are provided, so the description must carry the transparency burden. It only states the action and prerequisite; it does not disclose auth requirements, effects on membership, error behavior for invalid codes, or reversibility.

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?

One short sentence with no filler, front-loaded action and parameter. Every word earns its place.

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 one-parameter operation with an output schema, the description captures the core action and input. It lacks some behavioral nuance, but the low complexity and complete schema make this adequate.

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 description coverage is 100% for the single invite_code parameter, so the schema already documents it. The description repeats 'invite code' without adding format, source, or validation details; baseline of 3 applies.

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?

Description uses a specific verb ('Join') and resource ('circle'), and specifies the mechanism ('with an invite code'). This clearly distinguishes it from sibling circle-management tools like accept_join_request and leave_circle.

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 phrase 'with an invite code' implies the intended use case, but the description does not explicitly state when to choose join_circle over related tools or mention exclusions. There is no guidance about the request-approval flow or when an invite code is required.

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