kroger_update_cart_item

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

The description discloses a key behavioral trait: setting quantity to 0 removes the item entirely. However, with no annotations, the description carries the full burden and does not mention prerequisites (e.g., item must already be in the cart) or potential failure modes.

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 that front-loads the action and gets straight to the point. Every word earns its place.

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 simple mutation tool with two well-documented parameters and no output schema, the description is largely sufficient. It covers the core actions but could benefit from noting assumptions like the item already being in the cart.

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 already describes both parameters with 100% coverage. The description adds no new semantic information beyond what is in the schema; it only reiterates that removing is possible.

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 the tool's function with specific verbs ('Update quantity' and 'remove') tied to a resource ('an item in the cart'). It distinguishes itself from sibling tools like add_to_cart (which adds new items) and view_cart (which lists items).

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?

Usage context is implied but not explicit. The description indicates this tool is for changing the quantity of an existing item or removing it, but it does not mention alternatives (e.g., add_to_cart for adding new items) or exclusions.

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