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

The description goes well beyond the annotations by disclosing that the key is returned only once, that unverified accounts have specific rate limits, and that verification happens via a separate sign-in flow. It also states an important limitation about existing accounts, making the tool's side effects visible to the agent.

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 dense and efficient: the core purpose comes first, followed by the most important behavioral caveats. Every sentence carries useful information and there is no filler.

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 only two parameters, an existing output schema, and no complex nested objects, the description covers the important operational details: authentication-free signup, one-time key issuance, rate limits, verification path, and behavior for existing accounts. Nothing critical is missing for an agent to invoke and interpret the outcome.

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 coverage is 100%, so the schema already documents the email and optional name parameters. The description reinforces that the email is used to create the account, but it does not add extra meaning beyond the schema, such as constraints or formatting.

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 action and resource: creating a Recall Kitchen account and API key from an email. It also distinguishes itself from sibling tools like create_api_key by noting that no API key or x402 payment is required.

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 usage context: it is for creating a new account without existing credentials, and explicitly notes that it will not re-issue a key if the email already has an account. It does not name an alternative tool directly, but the boundary is clear enough for an agent to infer when not to use it.

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