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

No annotations are provided, so the description carries the full behavioral burden. It usefully discloses that this is a non-mutating handoff ('does not create an order'), which is a meaningful safety fact, but it omits whether the link expires, what the returned artifact is, or any auth/permission requirements. One important trait disclosed, several left open.

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?

A single tight sentence with the scope constraint front-loaded; no filler or redundancy.

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 2-parameter tool with no annotations and no output schema, the description should explain what the produced link is and how gift_note/items behave. Neither the parameters nor the return value are addressed, leaving significant gaps before an agent could call this confidently.

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?

Two parameters with 0% schema description coverage: the schema constrains 'items' (variant_id, quantity 1-99, 1-20 items) but never explains it, and 'gift_note' is entirely undescribed. The description adds no parameter meaning whatsoever, so it fails to 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?

Names a specific verb and resource ('Build a cart handoff link') and adds an explicit negative scope ('does not create an order'), which immediately separates it from any order-creating operation. It does not name or contrast with any sibling tool, but the siblings (product/collection browsing) are in a clearly different domain, so differentiation is not really at issue.

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 implies the scenario (you hand a cart off to a checkout/elsewhere rather than placing an order), but there is no explicit when-to-use statement, no prerequisites, and no alternatives named. Usage is inferable from the negative clause rather than stated.

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