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

Annotations declare readOnlyHint=false, destructiveHint=true, idempotentHint=false and openWorldHint=true, and the description adds substantial context beyond them: single-use link, 7-day validity, sent to the email already on the quote, reports whether it was sent, no SMS, and nothing is purchased. The one gap is that the destructiveHint=true claim is never explained or reconciled — nothing in the text describes an irreversible or destructive effect, only a benign email dispatch.

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?

Front-loaded with the verb and resource, and the follow-on sentences each carry distinct facts (expiry, no SMS, nothing purchased, target scenario). It is dense with semicolon-chained clauses in the first sentence, which slightly hurts scannability, but no sentence is 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?

An output schema exists so return values need no explanation, and the description nevertheless covers delivery channel, recipient source, link lifetime, single-use nature, and the fact that no purchase occurs. For a two-parameter, fully-described-schema tool this is complete enough to invoke correctly.

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 description coverage is 100%, so both parameters are already documented in the schema, establishing a baseline of 3. The description adds only modest extra meaning — that the recipient address comes from the saved quote rather than being supplied — which is a useful constraint but not syntax or format detail beyond the schema.

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?

States a specific verb and resource (emails a secure bind link) plus its full mechanism: a single-use 7-day link to the bind page where the customer reviews the option and submits, with a licensed agent completing the purchase. This is clearly distinguishable from the sibling request_bind_inline, which implies an immediate bind rather than a deferred emailed link.

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?

Gives clear triggering context: "Useful when the customer wants to finish later or on another device." It also implicitly excludes the immediate inline path by describing a deferred flow. However, it never names the alternative tool (request_bind_inline) or explicitly states when NOT to use this one, so routing still requires inference.

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