billing_payment_methods_get_list

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is fully covered. The description adds genuine context beyond that — results vary by region and account type — but says nothing about ordering, whether a default method is flagged, or what an empty result means.

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 short lines, front-loaded with the action and immediately followed by the scoping rule. The trailing 'GET /billing/payment-methods' is mildly redundant but cheap and useful for mapping to the underlying API.

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 zero-parameter, read-only list endpoint with full annotation coverage and no output schema, the description covers what the tool returns and what determines the contents. The one real gap is disambiguation from the near-identical account-level sibling.

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 there is no parameter meaning to convey and the baseline of 4 applies. The description correctly indicates that filtering happens implicitly via the caller's identity rather than through inputs.

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 ('Get available payment methods') and scopes the result to the authenticated user's region and account type. It does not, however, distinguish itself from the very similarly named sibling account_payment_methods_get_list, leaving the agent to guess which list is which.

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?

There is no when-to-use guidance, no exclusions, and no pointer to an alternative such as account_payment_methods_get_list or billing_payment_methods_get_exchange_rates. The only usage signal is implicit in the phrase 'available for the authenticated user'.

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