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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), and the description adds genuinely new behavioral facts: no input is required, no key is needed, and the exact content returned. It stops short of richer operational detail, but for a static onboarding read there is little else to disclose.

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 earns its place and the ordering is front-loaded: trigger condition first, then input/return behavior, then the do-not-use exclusion and the auth reassurance. 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?

There is no output schema, so the description compensates by enumerating the returned artifacts (sign-up link, key types, connection/auth info, doc links), and it also clarifies the auth requirement. An agent has everything needed to call and route this 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?

With zero parameters the baseline is 4, and the description reinforces this by stating 'Takes no input', which matches the empty schema. Nothing further is needed.

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 opens with a precise trigger (no account or key yet, or asking how to connect an agent) and then states exactly what the tool returns: sign-up link, test/live key explanation, server connection/auth details, and docs/OpenAPI links. This is clearly an onboarding/info tool, easily distinguished from the case-manipulation siblings.

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 both the positive condition ('person has no account or key yet, or asks how to connect an agent') and an explicit exclusion ('Do not use this to check a key the person already has'), naming the alternative behavior of sibling case tools that report missing/refused keys.

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