Create Subscription Checkout

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

The description states it creates a Stripe-hosted checkout link, which implies a mutating operation consistent with idempotentHint=false. However, it adds no detail about side effects, required authentication, or what the link entails beyond the annotation hints. Since annotations already flag openWorld and non-idempotent behavior, the description contributes minimal additional transparency.

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 a single, efficient sentence that states the core purpose without filler. The key action and target audience are front-loaded, giving an agent immediate understanding.

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 the lack of usage guidance, the tool's simplicity (3 params, all documented) and the presence of an output schema mean the description is mostly sufficient. It clearly identifies the purpose and plan scope, and nothing essential about how to invoke it is missing. Slight deduction for not providing any context on when to prefer this over sibling checkout tools.

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%, with all three parameters having explicit descriptions. The description adds no new parameter details beyond what the schema already provides—the 'Pro or Scale' reference merely echoes the plan_id enum. Baseline 3 applies because the schema fully documents the parameters.

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 specifies a concrete action (create) and resource (checkout link), and clearly scopes it to Pro or Scale subscriptions. This distinguishes it from siblings like create_credit_pack_checkout and create_billing_portal_link without needing to inspect schemas.

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 provides no explicit guidance on when to use this tool versus alternatives. It does not mention exclusions, conditions, or compare with related tools such as create_credit_pack_checkout. The selection must be inferred purely from the name and description.

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