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

With no annotations, the description carries the full burden and largely succeeds: it discloses how price is determined (SLA amount in-window, grace amount after, in the admission asset), that payment happens through x402 metadata retry, and includes a security constraint ('Never pass a private key'). It omits idempotency and failure/retry semantics after a successful unlock, which keeps it below 5.

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?

Front-loads the purpose in the first sentence before the payment mechanics, and every subsequent sentence adds operational value. Slightly dense and fragmented by line breaks, but no wasted sentences.

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?

No output schema exists, and the description covers the return only loosely ('the human result'), which is its weakest point. For a payment-gated mutation, though, the critical decision inputs — cost model, payment flow, safety warning — are all present.

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%, so the description must compensate, and it does so for payment_signature: omit first, it represents the x402 signature, and never substitute a private key. verify_id is only implicitly documented via 'a ready chain', leaving one parameter's meaning inferred.

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?

States a specific verb ('unlock') and resource ('a ready chain'), and clarifies the return ('the human result'), which is unusual in this domain. It does not, however, explicitly distinguish itself from the sibling verify_claim; the boundary is only implied through the get_verify/pay workflow.

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?

Gives concrete procedural guidance: omit payment_signature first so x402-aware clients auto-retry, or pass the signature manually for generic clients. It references get_verify as the preview step ('shows it as service_window.unlock_amount before you pay'), establishing workflow order. It stops short of explicitly naming when-not-to-use it versus verify_claim.

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