Shop Cart View

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

With no annotations, the description carries the burden of behavioral disclosure. It does state that the tool renders a full shopping cart UI with items, totals, billing address, and payment confirmation, but it does not explicitly address side effects, freshness, or authorization requirements. This is adequate but not rich.

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 compact and front-loaded: the first sentence states the purpose, the second adds render specifics, and the third provides usage context. Every sentence earns its place with no 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 simple view tool with optional parameters and no output schema, the description covers the key action, content rendered, and usage sequence. It could be more complete by explicitly mentioning empty-session behavior or language parameter, but these are minor gaps.

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 schema already explains session_id, and the description reinforces the checkout-session connection. However, the description adds no meaning for the undocumented lang parameter, and it does not compensate for the 50% schema description coverage gap.

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 identifies the operation: showing cart contents, billing details, and order status for a checkout session. It is specific enough to distinguish from catalog/product siblings and names the checkout context explicitly.

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 gives an explicit usage trigger: 'Use after create_checkout_session to track your order.' It does not, however, state when not to use this tool or mention alternatives such as refresh_shop_cart.

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