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

With no annotations, the description carries the full burden. It usefully discloses the auth profile ('No key') and the return content (per-item fulfillment status + fulfillment events), which is meaningful for a read tool, but says nothing about error cases, rate limits, or that the operation is strictly non-mutating.

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 compact sentences with the primary purpose front-loaded and the auth/hosting caveat trailing. No filler, though the parenthetical and the cloud note could be woven together more tightly.

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?

No annotations and no output schema, so the description must stand alone. It covers purpose, return content, and auth, but omits the meaning of 'id', any failure/error behavior, and how this differs from the sibling get_checkout, leaving gaps for a two-parameter tool.

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 0%, so the description must compensate for both parameters. It gives partial meaning to 'cloud' ('pass cloud for a hosted merchant') but leaves the format/value unclear and says nothing at all about the required 'id' (what identifier namespace it belongs to), so half the parameters remain undocumented.

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 (View) and resource (UCP checkout session as an order), with a parenthetical clarifying the payload (per-item fulfillment status + fulfillment events). This distinguishes it reasonably from write-oriented siblings like uxc_complete_checkout, though it does not explicitly contrast with the close sibling uxc_get_checkout.

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 only guidance is an auth note ('No key; pass cloud for a hosted merchant'), which is really a parameter hint rather than when-to-use. It never says when to call this versus uxc_get_checkout or the other checkout siblings, leaving the main selection ambiguity unresolved.

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