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

With no annotations present, the description carries the full burden and does so excellently. It discloses the one-time visibility of the API key, the need to store it immediately, the 30-day provisional account policy, deletion consequences, and per-IP rate limiting—all behaviors an agent must know to avoid losing the account.

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?

Every sentence carries essential, non-redundant information: creation action, credential requirement, security-critical key-retrieval warning, provisional-account deletion policy, and rate limiting. The key warning is front-loaded, and there is no filler or repetition.

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 tool has no parameters, no annotations, and no output schema, the description compensates fully. It tells the agent what will happen, what to do with the result, how long the account lasts, and what follow-up action is needed. Nothing critical is missing for successful invocation.

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 tool has zero parameters, so the baseline is 4. The description adds no parameter-specific meaning, but this is not a gap because there are no parameters to document. The API key return behavior is described, which is relevant but not parameter semantics.

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 ('Create a new AgentDomains account') and the result ('get an API key'), distinguishing it from siblings by being the only account-creation tool. It also clarifies that no existing key is required, which separates it from all other tools.

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 gives clear context for when to use this tool: when creating an account and obtaining an API key, and explicitly notes 'Requires no existing key.' It references attach_email as a follow-up step, but it does not explicitly describe scenarios where another tool should be chosen instead.

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