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

Beyond the annotations, the description discloses the conditional behavior that an API key is provisioned when auto-verification is active. This is meaningful behavioral context for an agent. It does not detail failure modes or email verification flows, but the annotations already cover the basic operational hints.

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 contain only necessary information: core purpose is front-loaded, and the key conditional behavior follows immediately. No wasteful or redundant wording.

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 registration tool with four documented parameters, an output schema, and basic annotations, the description provides the essential caveat about auto-verification and API key provisioning. It could mention what happens when auto-verification is inactive, but the description is largely complete for selecting and invoking the tool correctly.

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%, and all parameters are already documented in the input schema. The description does not add parameter-specific meaning, but given the high schema coverage, the baseline of 3 is appropriate.

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?

Clearly states the action 'Register' and the resource 'brand-new Civify account', distinguishing it from sibling tools such as civify_login by emphasizing new account creation. The description is specific and unambiguous about scope.

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 'brand-new' clearly implies this is for new users, which provides context for when to use it. It does not explicitly state that existing users should use civify_login or that the tool is not for authentication of existing accounts, so it stops short of full exclusion guidance.

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