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

No annotations are provided, so the description carries the full behavioral burden, and it does disclose the complete shape of what is returned (key/label/type/required/help/options). It never explicitly states the call is a read-only, zero-argument lookup, which is a minor omission given no output schema exists.

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, no filler, with the returned field set front-loaded and the usage note second. Every clause earns its place.

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 input params and no output schema, the description covers the important ground by enumerating return fields and the downstream consumer. It could be marginally fuller on the return container format, but nothing essential for correct invocation 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 takes zero parameters, so there is nothing for the description to disambiguate; baseline for a no-param tool. The mention of 'keyed by field key' usefully explains how the returned keys are consumed downstream.

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 names the exact resource ('Every field of the VPNCompareHQ enquiry') and enumerates the returned attributes (key, label, type, required, help text, options), which is more specific than a tautology. It does not explicitly differentiate itself from the close sibling enquiry_describe, so an agent must infer the distinction.

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?

It does not state when to prefer it over enquiry_describe, but it clearly supplies the workflow context: 'Pass answers to submit_enquiry keyed by field key', telling the agent this is the discovery step preceding submission. Clear context without explicit exclusions.

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