local_payment_methods

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

No annotations are provided, so the description must convey behavioral traits alone. It details the output fields (rail, use‑cases, issuing authority, support level, operational notes) and implies a read‑only listing. A minor gap is lack of explicit statement that it is safe/non‑destructive, but the content strongly suggests that.

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?

The description is detailed but not wasteful; it front‑loads the purpose and example methods. One minor point: it could be slightly more concise by grouping examples, but the informativeness justifies the length.

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 4 optional parameters, no output schema, and no annotations, the description fairly completely explains what the tool does, what it returns, and how to filter. Missing are pagination or limit details, but these are often not critical for a list of payment methods. Overall it provides enough context for correct invocation.

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 100%, so the baseline is 3. The description adds value by explaining the default use‑case scope and listing example payment methods, which provides richer context beyond the schema descriptions. For instance, it clarifies that the default filter is helloBooks' core use cases.

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 specifies the exact resource ('local bank-rail / wallet payment methods'), the context ('HelloBooks invoice collection, B2B supplier payments, contractor payouts'), and gives concrete examples (UPI, RuPay, NEFT, etc.). It clearly distinguishes from sibling tools like list_tax_rates or list_credit_packs, which serve different domains.

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 description states filtering options by country, useCase, rail, or id and notes the default scope. While it doesn't explicitly contrast with siblings, the context makes it clear this is the go‑to tool for payment method lookup. A small improvement would be adding a sentence like 'Use this when you need to find available payment rails for a country or use case.'

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