validate_checkout_slot

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

With no annotations, the description discloses the action (submits a device fingerprint ID) and enumerates the return contents (cart state, checkout step, store context, workflow steps, warnings, checkout links). It also states the authentication prerequisite. It does not explicitly state whether the operation has side effects, but 'validates' suggests read-only behavior.

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 the action and resource, then return values and usage context. No redundancy; every sentence carries useful information.

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?

Despite no output schema, the description lists the key return fields and positions the tool in the checkout flow (slot selection before payment). It also covers the required authentication, making it self-sufficient.

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 coverage is 100% and both parameters are fully described in the schema. The description adds an example for basket_service_type ('driveclcv') and mentions the device fingerprint context, but does not add significant meaning beyond the schema.

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 'validates the checkout slot step' for a specific basket service type, naming Carrefour France and giving an example ('driveclcv'). It distinguishes from sibling tools like validate_checkout_summary by specifying the slot step rather than the summary step.

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 provides clear workflow context: 'Useful for confirming the slot selection step before proceeding to the payment step.' It also notes the authentication requirement, but does not explicitly name alternative tools or when not to use it.

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