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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does state that the tool 'creates' a payment session, indicating it has side effects. However, it does not describe further implications such as whether a charge is initiated, idempotency concerns, or what happens after the session is created. The sequencing context is useful, but more behavioral detail is needed for full 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 one sentence of 17 words, clearly stating purpose and timing without fluff. It earns its place by providing high-level context. However, the brevity contributes to the lack of parameter and behavioral information, so it is not a perfect score. It is efficient but under-specified.

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?

Given the tool's complexity (7 parameters, no annotations, no output schema, 0% schema coverage), this minimal description is insufficient. It does not explain the relationship between parameters, what the function returns, or how the payment session integrates with the booking flow. An agent would lack critical context to invoke the tool correctly, especially compared to sibling tools that appear more fully described.

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?

The input schema has 7 parameters and 0% description coverage. The description does not mention or explain any parameter, leaving the agent to infer the meaning of 'session_token', 'deposit_amount_minor', 'address_id', etc. solely from the schema. Since the schema lacks descriptions, the tool description must compensate, and it fails entirely to do so.

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 clearly states the tool's action: 'create a Stripe checkout payment session.' It includes a specific verb and resource, and distinguishes this from related tools like get_booking_payment_status by describing the exact point in the flow ('after collecting booking details... before final booking submission'). This is unambiguous and differentiates it from 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?

The description gives clear timing instructions: 'Use after collecting booking details' and 'before final booking submission.' This tells the agent when to call the tool, but it does not explicitly mention when not to use it or name alternative tools. Since it lacks exclusions or alternative references, it scores a 4 rather than a 5.

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