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

With no annotations, the description carries the full behavioral burden. It discloses only that an order id is returned; it omits that this is an irreversible purchase, what happens with an empty cart, whether it charges payment or requires auth, and whether it clears the cart.

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?

Two short, front-loaded sentences with no filler; the action is stated first and the return value second.

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?

No output schema exists so 'Returns order id' covers the return value, but for a high-stakes irreversible mutation with no annotations and no parameter documentation, the description should disclose side effects, cart-clearing behavior, and failure modes.

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 zero parameters, so the baseline is 4. The phrase 'current cart' usefully signals that the cart is implicit server-side state rather than an argument.

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?

States a specific verb+resource: 'Place order for current cart', which is distinct from the sibling read/cart tools (add_to_cart, get_cart). It is clear what the tool does, though it does not explicitly name or contrast with siblings.

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 is only implied via 'current cart' — an agent can infer this is the terminal step after populating a cart, but there is no explicit when-to-use, when-not-to-use, or prerequisite (e.g., non-empty cart, payment readiness).

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