get_cart_items

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

The description states 'Fetch', which implies a read-only operation, but with no annotations provided, it does not disclose additional behavioral details such as side-effect-free guarantees, return format, or any prerequisites. The description is minimal but not misleading.

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 a single concise sentence, front-loaded with the action and resource, with no redundant words or filler.

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 zero-parameter, zero-output-schema tool, the description sufficiently conveys the tool's purpose and scope. There are no complex behaviors or inputs to explain, though it does not detail the return structure in added depth.

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?

There are no parameters defined, so the description has nothing to clarify in terms of parameter semantics. Per rubric, zero parameters earns a baseline score of 4.

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 uses a specific verb 'Fetch' and clearly identifies the resource as 'all items currently in the shopping cart'. This unambiguously distinguishes it from sibling tools like get_order_history or add_to_cart, and there is no ambiguity about what the tool does.

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 usage for viewing current cart contents, but provides no explicit guidance on when to use this tool versus alternatives. It does not mention exclusions or scenarios, so the usage context is only implied rather than clearly stated.

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