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

Beyond annotations (readOnly, openWorld, idempotent, non-destructive), the description adds concrete behavior: it detects missing, unexpected, duplicate, and mismatched records; it is deterministic; it is paid with a specific x402 price; and it excludes legal/accounting advice. These are meaningful traits annotations do not convey.

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?

Three sentences, with the main purpose first and cost/limitations after. It is mostly efficient, though 'Paid' appears in both the first and third sentence, a slight redundancy. No fluff beyond that.

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 2-param tool with no output schema, the description explains the core function, cost, and detection types, but it omits the return shape (what a reconciliation result looks like) and any guidance on format or size of the arrays. It is adequate but leaves important operational details open.

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?

The schema provides only arrays named 'expected' and 'observed' with 0% description coverage. The description gives minimal meaning by calling them 'expected versus observed agent-commerce settlement records', but it does not specify element structure, required fields, or formats. This is insufficient to determine what to pass, so the description only partially compensates.

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 names the resource (agent-commerce settlement records), the operation (reconciliation), and the specific outcomes (detects missing, unexpected, duplicate, mismatched). It also distinguishes technical reconciliation from legal/accounting advice, making its scope clear among the many sibling tools.

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 implies when to use via 'reconciliation of expected versus observed' and gives an exclusion ('technical reconciliation only, not legal or accounting advice'), but it does not point to any alternative tool or say when not to use it beyond the technical/legal caveat. No sibling differentiation is offered.

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