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

With no annotations provided, the description carries the full burden. It discloses a critical behavioral trait: the webhook fires even if the agent dies, which reassures about durability. It stops short of explaining cancellation, retries, or delivery guarantees, but the included detail is valuable and not evident from the schema.

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 consists of two concise sentences, front-loaded with the action 'Schedule a webhook call.' Every word earns its place: 'one-shot' differentiates, and 'Your agent can die; the call still happens' adds critical behavior. No fluff or redundancy.

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?

For a simple tool with three parameters, no output schema, and clear sibling context, the description covers the essentials: what it does, one-shot behavior, and durability. It is complete enough for an agent to select and invoke the tool correctly. Minor gaps like webhook authentication or response details are not necessary for basic usage.

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% for all three parameters, so the baseline is 3. The description does not add any parameter-specific detail beyond what the schema already provides. It simply repeats the 'webhook call' context, making the description's contribution to parameter understanding minimal.

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 states a specific verb and resource: 'Schedule a webhook call at a future time (one-shot).' The qualifier 'one-shot' clearly distinguishes it from recurring sibling tools like create_drip, create_schedule, and create_deadman. This is exact and unambiguous.

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 clear context for when to use this tool by specifying 'one-shot' and 'Your agent can die; the call still happens.' This implies it is for fire-and-forget, durable scheduling. However, it does not explicitly name alternatives or state when not to use it, so it falls 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.