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

With no annotations, the description carries the full behavioral burden. It usefully discloses the one-shot firing semantics and that the caller need not stay alive or poll, but it is silent on failure handling (what if the POST fails), retry behavior, whether a pending wakeup can be cancelled, and whether multiple wakeups may be registered concurrently.

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?

Two tight sentences, front-loaded with the mechanism and followed by the motivating scenario. Nothing is redundant with the title or padding.

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 tool has no output schema and no annotations, so the description is the only source of behavioral context. It covers the happy path well but omits delivery-failure behavior and cancellation, which matter for a fire-and-forget external callback.

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 all three parameters, including the nested payload object and the 1–86400 delay range, are already documented in the schema. The description adds no parameter-level detail beyond implying the delay and callback, so baseline 3 applies.

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 gives a concrete verb and resource: 'Schedule a one-shot HTTP POST to a callback URL after a delay,' plus the underlying intent ('be woken up later'). It clearly distinguishes the mechanism from the polling-based siblings by describing a one-shot delayed callback, though it never explicitly names an alternative like arm_deadman_watchdog.

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?

It states the use case clearly: check back on a slow job, a deploy, or a long-running request after the current turn ends. There is no explicit when-not guidance or named alternative tool, which keeps it 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.