list_allowance_reason_codes

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

No annotations are provided, so the description carries the full burden for behavioral disclosure. 'List' implies a read-only operation and 'from the CEF EN 16931 code list' clarifies the data source, but the description does not mention ordering, version sensitivity, pagination, or whether the list is exhaustive. The output schema covers the return shape, but behavioral context beyond that is thin.

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?

A single, front-loaded sentence states the action, object, and source with no filler. Every word adds information, and the source qualifier is the only necessary elaboration beyond the tool name.

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?

The tool is a simple zero-parameter list with an output schema, and the description names the standard code list, which is the key context. It could have mentioned the relationship to check_allowance_reason_code or code-list versioning, but nothing essential for invoking the tool correctly is missing.

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 has zero parameters, so the schema already fully defines the input contract. The description correctly avoids adding parameter detail; per the baseline for zero-parameter tools, a 4 is appropriate because there is no parameter semantics left to clarify.

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 a verb ('List'), a precise resource ('allowance reason codes'), and a source ('CEF EN 16931 code list'). This distinguishes it from related siblings such as check_allowance_reason_code and list_charge_reason_codes, which operate on different resources or actions.

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 implied by the 'list' verb and the resource name: an agent would use this to retrieve the full set of allowance reason codes. However, the description does not explicitly say when to prefer this over check_allowance_reason_code or how it relates to sibling list tools, so the guidance is implicit rather than stated.

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