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

The description adds substantial context beyond the annotations: no account exists until the e-mail owner clicks the confirmation link, sets a password, and accepts terms. It also explains the setup_token and confirmation_code return values and notes that existing account holders receive a login link instead, which is important behavioral disclosure for a non-idempotent, open-world account-creation 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 action and then covers the confirmation flow and return values without repetition. The length is justified by the important caveats around e-mail confirmation and existing accounts.

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 an account-creation tool with no output schema and non-idempotent, open-world behavior, the description covers the critical process, side effects, return values, and the existing-account edge case. An agent has enough information to invoke it correctly and set expectations.

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%, so the parameters are already fully documented. The description reinforces that the e-mail is the user's own and that the organization is the user's company, but it does not add syntax or meaning beyond the schema, particularly for locale and website.

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 states a specific verb and resource: it starts a free CookiePilot sign-up for the user's own e-mail and company. It is clear what the tool does, but it does not explicitly name sibling tools or directly differentiate itself from check_account_status or other onboarding 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?

It gives clear usage context by requiring the user's explicit request and specifying that the e-mail must be the user's own. It does not state when not to use it or name an alternative tool, such as check_account_status, before creating an account.

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