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

With no annotations, the description carries the full burden and does so well: it discloses that nothing is bought, ordered or paid, no quote is guaranteed, and the service is free, plus what the response contains (recipients, consent wording, confirmation step). It could go further on side effects or what the caller must do with the returned consent text, but the key behavioral profile is disclosed.

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 tight sentences, front-loaded with the imperative 'Read first,' and every clause (free, no purchase, no guaranteed quote, what is returned) carries distinct information. No filler.

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 describe tool with no output schema, the description adequately covers both the nature of the enquiry and the shape of the return (recipients, consent wording, confirmation), which is exactly what an agent needs. Nothing material 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 to disambiguate and the baseline of 4 applies. The description adds nothing param-related, but none is needed.

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 states a specific function: it explains what submit_enquiry does on this CRM agency, i.e. a read-only informational/describe tool. It clearly contrasts itself with the act of submitting ('something submit_enquiry does') and explains the nature of the enquiry (human providers, direct quotes). It does not explicitly differentiate from the other sibling, enquiry_fields, so it falls short of a 5.

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 opening 'Read first' is an explicit ordering instruction that tells the agent to call this before submit_enquiry, and the body reinforces that by naming submit_enquiry. There is no stated when-not or explicit comparison to enquiry_fields, so it stops short of a 5.

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