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

With no annotations, the description carries the full burden, and it does disclose the important side effect (credits the received amount), the tolerance window (-0.5% or $0.01), and the signature fallback for mismatched amounts. It omits idempotency (can the same order be verified twice?) and what happens on failure, which matters for a credit-granting mutation.

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 dense sentences with the action and required identifiers front-loaded and the tolerance/signature rule following as supporting detail. No filler.

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 no annotations, no output schema and completely undocumented parameters, the description covers purpose, precondition, mutation effect, tolerance rule and the signature escape hatch well. Return value and duplicate-verification behavior remain unstated but are the only notable omissions.

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 map all three parameters to meaning — order_id and tx_hash as the required pair, and signature as the optional value needed when the credited amount falls outside tolerance. It does not specify hash/signature format or which chain, a minor residual 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?

States a specific verb and resource ('Confirm a top-up') plus the exact identifiers needed to do it, so the agent knows precisely what operation is performed. It does not differentiate itself from the sibling claim_topup, which sounds closely related, leaving ambiguity about which confirmation path to take.

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 phrase 'after sending funds' supplies a clear precondition for invocation, which is the key contextual trigger. However, it never states when to use claim_topup instead, nor what to do if verification fails.

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