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

Annotations only declare readOnlyHint=true; the description adds a real constraint beyond that — the hard 3-month maximum span and the batch-call workaround — plus what content is returned (the documents the payments settled). No auth, rate limit, or truncation behavior is described, but the safety profile is already covered by annotations.

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 tightly packed sentences: purpose and returned content first, then the binding constraint, then the underlying endpoint. No filler, and the most decision-relevant fact (3-month limit) is front-loaded.

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?

With no output schema, the description carries the burden of stating what comes back ('the documents they paid'), which it does, and the total-count/limit behavior is covered in the schema. It is nearly complete; only pagination/truncation behavior for very large result sets goes unmentioned.

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 six parameters, including the date_type enumeration, max_results cap, and the cross-reference to merit_list_payment_types, are already documented in the schema. The description adds nothing about parameter formats or interactions, so the 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?

States a specific verb+resource (List payments) and defines scope precisely with the parenthetical 'customer and vendor receipts and payouts... with the documents they paid', which implicitly separates it from narrower siblings like merit_customer_payments_report and merit_list_bank_payments. It is clear, but it never explicitly names or contrasts with an alternative tool.

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 operational context: the period may span at most 3 months (Merit limit) and longer spans require several calls. It lacks explicit when-to-use/when-not guidance relative to the payment-report siblings, so an agent must infer which tool fits a customer-only or bank-only question.

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