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

No annotations are provided, so the description carries the full burden. It discloses that the token is returned 'once', which is useful behavioral context about non-idempotency, but omits whether this is a polling operation, what happens on non-approval, or timing/rate-limit considerations.

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?

Single sentence with zero waste, front-loading the goal ('Finish signup') before the mechanics. Efficient, though not as richly structured as a top-tier multi-sentence definition.

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 no annotations and no output schema, the description should ideally cover what happens when approval is pending/rejected and the meaning of polling. It covers the happy path and the 'once' token trait, but leaves behavioral gaps for an agent to wonder about.

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 both parameters with their origins ('From account.create'). The description adds no parameter-level detail beyond what the schema provides, making the baseline 3 appropriate.

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?

States a specific outcome: checking owner approval and returning a token upon approval. The 'Finish signup' framing distinguishes it from account.create, though it doesn't explicitly reference the sibling by name.

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?

Implied usage is that this is called after account.create to complete signup, and the schema descriptions reinforce this by saying both params come from account.create. However, there's no explicit when-to-use or when-not-to-use guidance, and the required 'poll' parameter's role is not explained.

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