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

With no annotations, the description reveals key behaviors: requires auth, generates a one-time link, and involves no payment. However, it does not mention link expiration, limits, or side effects like invalidating previous links.

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 two concise sentences, with the main action front-loaded. Every word serves a purpose: 'Generate a one-time link for an owner to bind this agent to their account.' No extraneous information.

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 the simple tool (no params, no output schema), the description covers essential aspects: auth, one-time nature, and no payment. It lacks detail on how the link behaves after use (e.g., expiry), but is otherwise complete for its complexity.

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?

The tool has zero parameters, and the description adds value by explaining the purpose without needing parameter details. Per guidelines, baseline for 0 params is 4, but the description provides clear context, earning a 5.

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 clearly states the tool's purpose: generating a one-time link for an owner to bind an agent to their account. It specifies that no invoice or payment is required. This distinguishes it from sibling tools, none of which generate similar links.

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 indicates auth is required and provides context on the scenario (owner binding). It does not explicitly exclude alternatives, but the unique function makes usage clear. A minor gap is not specifying 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.