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

With no annotations, the description carries the full burden and does disclose meaningful traits: a per-call cost of two cents over x402, the 402-with-requirements first response, refusal of not-yet-chained moments, the ~3-hour chaining lag, and the shared-payment semantics ('one payment opens a face-tick for everyone after'). It does not describe error modes beyond refusal or the shape of a successful payload, but the payment and refusal behavior is unusually well covered.

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 prose is dense and every clause carries information, but the opening sentences are poetic and the practically critical payment mechanics sit mid-paragraph rather than being front-loaded. A reader must parse metaphor before reaching 'Two cents over x402' and the refusal rule, which weakens structure even though little is redundant.

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 five-parameter tool with no annotations, no output schema, and 0% schema coverage, the description covers payment, refusal, and the settlement lifecycle but omits key callable details: how lat/lon pair with `at`, what units or valid ranges they take, and what a successful witness payload contains. It is coherent but not fully sufficient to invoke confidently.

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 0% with five parameters, so the description must compensate. It does explain `at` (ISO hour or tick, UTC, default newest), `addr` (from an earlier answer, re-reads one face-tick), and `payment` (the x402 proof), covering three of five. `lat` and `lon` are only implied by 'the wind at a place' and their units/expected ranges go unstated, leaving a real gap.

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 does convey the resource — wind state at a place and moment as committed to a chain, including proofs and the outside anchor — so it is not a tautology. However, the intent is wrapped in metaphor ('nest face's three corners', 'the Merkle opening to the tick's chained root'), and it never distinguishes itself from close siblings like ground, open_ground, or tick. An agent would have to infer the specific role from the settlement narrative at the end.

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?

Usage conditions are stated concretely: `at` selects an hour or tick and defaults to the newest chained tick, unchained moments are refused rather than substituted, and the two-stage x402 flow (get 402, retry with `payment`) is spelled out. It also names collaborating siblings stamp() and meet() in the settlement flow. What is missing is any explicit when-to-use-this-instead-of-ground/open_ground guidance.

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