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

The annotations already declare readOnlyHint, openWorldHint, and idempotentHint. The description adds specifics: opening the link twice does not double quantities, the result lists out-of-stock lines, and the shopper pays at checkout. These details go beyond the annotations and explain the effect on the basket and order flow.

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?

The description is five sentences long, packing in purpose, idempotency, out-of-stock handling, usage, and id source. It is front-loaded with the core action and flows logically. While slightly verbose, each sentence contributes meaningful guidance and the structure is clear.

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 discloses that the result includes out-of-stock line information, which is critical for the agent to act on. It also explains the basket behavior, idempotency, and that the shopper completes payment. For a simple tool with two parameters, this is virtually complete; only a minimal gap remains regarding the exact response format, which is not essential for invocation.

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?

The input schema provides complete descriptions for both parameters (items array and locale), achieving 100% coverage. The description adds a note about where ids come from, but that information is already in the schema. No additional semantics are introduced beyond the schema baseline, so a 3 is 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?

The description clearly states that the tool converts product ids and quantities into a basket link on camdentools.com. It uses specific verbs and names the resource, distinguishing it from all sibling tools (there are no other create tools). The purpose is unambiguous.

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?

It explicitly says 'Use it to finish a shopping conversation,' giving a clear when-to-use scenario. It also directs that ids come from search_products, list_products, or get_product, which sets a prerequisite. It does not mention exclusions or alternatives, but given the unique function, the guidance is sufficient.

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