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

Annotations already cover the mutation/idempotency/safety profile (readOnlyHint=false, idempotentHint=true, destructiveHint=false). The description adds meaningful context beyond that: the write lands as a private draft, not a live site, and no email is dispatched, which sets correct expectations for the caller and the user.

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?

Two tightly packed sentences with the core action and the required follow-up (give the link) front-loaded. No filler, though the second clause about verification and email could be tightened.

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?

With no output schema, the description correctly surfaces the key return value (approvalUrl). But for a tool taking a deeply nested document payload with 25% schema coverage, it omits any guidance on what the document must contain or what happens on failure, leaving gaps for a complex call.

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?

Only 25% of parameters carry schema descriptions, and the description explains none of them beyond a passing hint that the user 'signs in with this email.' The semantics of agentName and, critically, the large nested document object are left entirely to the schema, so the description does not compensate for the coverage gap.

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 verb and resource ('Create the user's website') and goes on to describe the visible outcome (private draft plus approvalUrl). However, it never distinguishes the tool from the sibling create_site, which by name appears to do something very similar, so a caller cannot tell them apart without opening both schemas.

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 post-call workflow is clear (hand the approvalUrl to the user, who signs in with this email and approves), and it rules out verification/email steps. But there is no explicit guidance on when to use this versus create_site, save_site, or the exchange_onboarding/onboarding_status pair, leaving the selection to inference.

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