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

Beyond the annotations (readOnlyHint=false, idempotentHint=false), the description discloses a real side effect: it creates an order and generates a payment link. It also adds operational context: authentication header requirement, supported shipping destinations, and VAT-inclusive pricing consistency with get_product.

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 deliver the action, the auth requirement, shipping constraints, and pricing behavior with no filler. The main purpose is front-loaded, and every sentence adds decision-relevant 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?

For a write operation with nested objects and no output schema, the description covers the essential behavioral context: what is created, what the customer receives, auth expectations, and shipping limitations. It does not spell out the exact response field for the payment link, but the description and schema together give enough to invoke the tool.

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 description coverage is 50%, and the description only indirectly covers parameter meaning by confirming prices/VAT and shipping country limits. It adds useful context for expected_total via the get_product price match, but it does not explain buyer or shipping_address semantics beyond what the schema already provides.

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 opens with a specific verb and resource: 'Create an order and get a Stripe payment link.' It clearly states the outcome and is distinct from the read/list/search sibling tools, so an agent can identify this as the checkout-creation action without needing to inspect the schema.

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 concrete preconditions and exclusions: authentication via X-Api-Key is required, shipping is limited to RO/HU/DE, and prices match get_product. It does not name an alternative tool, but among the siblings there is no other create/checkout tool, and the country restriction effectively tells the agent 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.