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

No annotations are provided, so the description carries the transparency burden. It clearly enumerates the returned field metadata and implies a read-only lookup, but it does not explicitly state that there are no side effects, whether authentication is needed, or how the field collection is returned. For a zero-argument metadata tool this is adequate but not richly transparent.

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?

Two sentences accomplish both description and usage guidance with no redundancy. The core information about what the tool returns is front-loaded, and the follow-up sentence adds practical integration guidance.

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 has no parameters and no output schema, so the description must carry the burden of explaining return values. It covers the output fields and the path to submit_enquiry well. It does not specify the exact return container (e.g., array of objects), but for a metadata listing this is sufficient.

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 and the schema is empty, so the baseline is 4. The description's mention of passing answers to submit_enquiry keyed by field key refers to the downstream tool's parameters rather than this tool's, and provides useful context for how the output should be consumed.

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 clearly states the tool exposes every field of the Current Annuity Rates enquiry and lists the exact attributes returned (key, label, type, required, help text, allowed options). It is specific about the resource and content, but it does not explicitly differentiate itself from the sibling tool enquiry_describe.

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 tells the agent to pass answers to submit_enquiry keyed by field key, which clearly indicates when this tool should be used: before submitting an enquiry. It does not explicitly name alternatives or exclusions, but the submission workflow is clearly implied.

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