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

With no annotations, the description carries the behavioral disclosure burden. It does disclose key facts: the created key is 'no-KYC', has the 'sk-lynx-...' prefix, and starts with 0 credits. However, it does not mention side effects (e.g., whether a new account is created), uniqueness constraints, or failure/error behavior beyond the happy path.

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 a single front-loaded sentence that states the action, the key property, the return format, and the credit status with no filler or repetition. Every element earns its place.

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 one-parameter tool with no output schema or annotations, the description covers the essential operational context: what is created, with what input, and what the caller gets back (including key format and credit state). It is not exhaustive about edge cases, but the low complexity makes this sufficient.

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 0%, so the description must compensate for the undocumented email parameter. It adds only that the email is used to create the key, which largely restates the property name. It does not clarify acceptable email formats, whether verification is required, or what happens if the email is already registered.

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 ('Create'), a precise resource ('no-KYC API key'), and the required input ('with an email'), and it explains the return value. This distinguishes lynx_signup from the sibling tools, all of which perform different operations (recon, extraction, ordering, etc.).

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 tool's intended use is implied by 'Create a no-KYC API key'—use it when you need to sign up for a key—but the description does not explicitly state when to prefer this tool over alternatives or mention exclusions. There is no direct comparison to sibling tools or note that this is only for initial key creation.

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