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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false and openWorldHint=false, so the safety profile is covered without description help. The description adds the returnable status lifecycle (incomplete | ready_for_complete | requires_escalation | completed | canceled), which is useful context. However, it never mentions the idempotency-key available under meta even though idempotentHint=false makes retry semantics a real concern.

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?

Three sentences, front-loaded with what the tool does, then the identifier grammar, then the return shape — each sentence carries distinct information. The status enumeration is somewhat redundant against the existing output schema, but the overall density and ordering are efficient.

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 non-idempotent mutation tool with deep nested objects and 0% schema description coverage, the description covers the critical line_items identifier grammar but leaves meta, buyer, and context unexplained. Since an output schema exists, not detailing return values beyond the status list is acceptable, but the missing input-side detail keeps this at a minimum-viable level.

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 description coverage is 0%, so the description is the only source of parameter meaning, and it does decode the most important one: line_items[].item.id using the rz:<venue>:<table_id|zone:<Zone>|any>:<YYYY-MM-DD>:<party> grammar. It says nothing about meta.idempotency-key, meta.ucp-agent.profile, buyer fields, context, or line_items[].quantity, leaving several parameters undocumented in both places.

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 opens with a specific verb and resource: "Creates a checkout session for one or more table requests," which separates it cleanly from get_checkout, update_checkout, complete_checkout, and cancel_checkout by action. It does not explicitly name those siblings or state the workflow position, so it falls short of the top band.

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?

There is no guidance on when to call this versus complete_checkout, update_checkout, or request_table, and no stated prerequisites or lifecycle conditions. The only implicit usage signal is that the session must exist before the other checkout tools can act on it, which the agent must infer.

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