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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds useful context beyond that: the link is hosted on connectmeguru.com and is a purchase/checkout URL rather than an in-app action. It does not disclose link expiry, single-use behavior, or whether repeated calls return the same URL, which matters for a link-generation tool.

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?

A single sentence that front-loads the action and the resulting artifact, with the domain qualifier placed before the scope. Nothing is wasted and nothing is buried.

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 an output schema present and annotations covering the safety profile, the description need not explain return values or permissions, and it covers the core purpose adequately for a two-parameter tool. The remaining gap is behavioral rather than structural: nothing about link lifetime, reuse, or coupon validation ordering.

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% with only two parameters, so the schema already explains packageCode and discountCode including examples. The description's only parameter-adjacent statement, 'for a specific eSIM package,' restates the required parameter rather than adding format, constraint, or coupon-application semantics. Baseline 3 applies.

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 gives a specific verb (generates), a specific artifact (secure web checkout and purchase link), a domain (connectmeguru.com), and scope (a specific eSIM package). This clearly separates it from siblings like get_esim_catalog, get_available_coupons, and validate_coupon without needing to name them.

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?

There is no explicit when-to-use, when-not-to-use, or alternative routing. Critically, the discountCode parameter implies a coupon flow, yet the description never says whether the coupon should be validated first via the sibling validate_coupon or discovered via get_available_coupons. The purchase intent is inferable but no guidance is stated.

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