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

The description adds environmental context ('blocked in ChatGPT', 'in-card Stripe is blocked') but does not explain what happens when the tool is invoked, what side effects it has, or what prerequisites exist. The annotations do not carry this burden either, so the description is thin on behavioral disclosure.

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 short, front-loaded with the critical warning, and every sentence provides actionable routing. There is no filler or repetition.

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?

The description is complete for redirecting an agent away from this tool)Skip() and toward the correct alternativearen't enough. However, it omits any explanation of what the checkout tool does or how it behaves, so an agent that might legitimately need this tool would still lack essential context.

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 high (75%), with packageId and stripeProductId already described in the schema. The tool description adds no parameter-level meaning, so it neither improves nor harms the agent's understanding. Baseline 3 is appropriate.

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 title indicates 'Create Stripe checkout,' but the description never states what the tool does. It only warns against use and redirects to alternatives, so an agent cannot learn the tool's function from the description itself.

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 explicit when-not-to-use guidance: 'Do not use in ChatGPT' and 'In-card Stripe is blocked.' It also names exact alternatives for different actors: humans should call ucode_render_credits and open the credits URL, while agents/bots should call ucode_agent_billing and pay via x402. This is model usage guidance.

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