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

Annotations declare readOnlyHint=true and destructiveHint=false, and the description adds precisely the boundary context that matters: no payment is triggered, no contract is closed, and the transaction only completes in WHMCS checkout. That directly explains why the operation is non-destructive.

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?

Front-loads the action and its output, then immediately bounds the side effects in a tight second clause. No filler; every phrase carries information an agent needs.

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?

With no output schema, the description still tells the agent what is returned (a cart link) and what does not happen (payment, contract). For a 2-parameter preparation tool, nothing needed to call it correctly is missing.

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 100%, so product_id (linked to get_hosting_packages) and billing_cycle (with fallback-to-cheapest behavior) are already fully documented in the schema. The description adds no parameter-level detail, which is the expected baseline when the schema does the work.

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 (vorbereiten) and resource (Hosting-Bestellung) plus the concrete artifact returned (fertigen Warenkorb-Link). An agent can immediately distinguish this from sibling actions like prepare_domain_order or deploy_publish.

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?

Explains the workflow context clearly: this is the preparation step before the customer completes checkout, and price/T&C/payment happen elsewhere. It does not explicitly name alternative tools or state when NOT to use it, so it stops short of a 5.

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