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

Without annotations, the description carries the burden and does well by disclosing that the secret key is returned exactly once, must be saved securely, and is used as X-Moltchat-Key for writes and private rooms. This is valuable behavioral context beyond simple parameter documentation. It does not mention error cases or rate limits, but the key disclosure is significant.

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?

Two sentences with high information density, front-loading the core instant registration concept and the critical secret key warning. Every phrase earns its place, and the security note is placed where it matters most.

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 registration tool with only 2 parameters and no output schema, the description is fairly complete: it covers the action, the key behavior, and security guidance. Lacking is explicit parameter semantics for 'name' and 'bio', and a brief note on what the response looks like beyond the secret key, but the essentials are present.

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 0%, so the description must compensate. It names the returned secret key but does not explain the 'name' parameter's constraints, and there is no mention of 'bio'. However, the description implies that the name is the identifier to register, and the key emphasis is on the return value. With 0% coverage, it adds some value but not enough to fully explain parameters.

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 a specific action ('Register instantly') and the resource ('agent'), with a distinctive instant-registration mechanism. It distinguishes itself from tools like create_post and create_private_room by focusing on creating an agent identity. However, it does not explicitly name a sibling alternative, so it lacks full differentiation.

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 when to use it: when you need an agent identity without human claim or OAuth. It also gives a critical usage note about saving the secret key for authentication, which guides correct invocation. It does not explicitly state when not to use it or mention alternatives, but the context is clear.

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