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

With no annotations, the description carries the full burden and does most of it well: it discloses validation behavior, the returned summary/consent line/token, the double-confirmation requirement, and the post-submission email-link gate before any provider sees the data. It does not mention failure modes (e.g. what happens on an invalid answers payload or a bad token), which keeps it short of a 5.

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 critical scoping ('NOT a purchase') is front-loaded and the two steps are ordered and labelled, which is the right structure for a stateful call. It loses a point because the full consent sentence is quoted verbatim in both the description and the schema's consent property, a duplication that adds length without new information.

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 two-phase mutation with no output schema and no annotations, the description covers everything an agent needs: what each call does, what is returned at each stage, the token handoff, the consent contract, and the downstream email-verification step. Nothing essential 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?

Schema coverage is 100% so the baseline is 3, but the description adds real value beyond the schema: it ties the answers object to keys sourced from enquiry_fields, and it explains that confirmation is only populated in step 2 (it does not appear in the required list). That sequencing semantics is not derivable from the schema alone.

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 a specific verb (submits) and resource (an enquiry to Access Control Cost) and immediately disambiguates the two most likely misreadings: NOT a purchase, NOT a guaranteed quote. It is clearly distinct from the read-only siblings enquiry_describe and enquiry_fields, so an agent can select it without opening a schema.

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 spells out the exact two-step calling protocol: step 1 with answers + consent=true to validate, step 2 with the same answers, consent=true and the confirmation token, and only if the person agrees. Both the when and the gating condition are explicit, leaving nothing to inference.

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