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

Annotations only declare readOnlyHint=true, so the description earns credit for adding paging behavior ('Not paged'), concrete rate limits (60/min, 1000/24h), and the underlying endpoint (settings/paymentmethods:get). This is genuinely useful operational context an agent could not get from the annotations alone.

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?

Four short clauses, front-loaded with the resource and returned fields, then endpoint, paging, and limits. Dense but each clause carries distinct information; only the parenthetical endpoint is arguably of low value to an agent.

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 and no parameters, the description compensates by naming the fields returned and stating that results are not paged, plus rate limits. This is close to complete for a simple read-only listing tool.

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 tool takes zero parameters, so the baseline is 4. The empty schema leaves nothing to document, and the description correctly does not invent parameter semantics.

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 (list) and resource (payment methods) and enumerates the salient fields returned (name, ledger account, whether cash). It is clearly distinguishable from sibling list tools like list_payments or list_accounts, though it never explicitly names a contrasting sibling.

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 is only implied: the agent can infer this is the way to enumerate payment-method settings. There is no statement of when to prefer this tool over related siblings such as list_payments or create_payment, and no prerequisites are given.

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