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

The readOnlyHint=true annotation already establishes the safe-read profile, so the description's job is lighter. It adds the id prefix convention and the underlying HTTP endpoint, but says nothing about auth requirements, error behavior for an unknown id, or response shape. With annotations covering the safety profile, this is adequate but not rich.

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?

One tight sentence: purpose first, id convention second, endpoint reference last. No filler sentences, and nothing an agent needs 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?

There is no output schema, so the description carries some burden for return semantics; 'details and status' is a minimal gesture at the response but does not describe what fields come back or what status values mean. For a simple single-parameter read tool this is passable, but it leaves a real gap.

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% for the single id parameter, so the baseline is 3. The description's 'e.g. pl_...' hint duplicates the schema's own example rather than adding new format or constraint information.

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 (Retrieve) and resource (Payment Link) scoped by id, and distinguishes itself from the sibling checkout_get_payment by naming the resource explicitly. The appended REST endpoint (GET /payment-links/{id}) reinforces the operation unambiguously.

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?

Usage is implied by the 'by its id' phrasing, which tells the agent this is a single-record lookup rather than a list or search. However, it offers no explicit when-to-use guidance or distinction from alternatives such as checkout_get_payment or checkout_search_payments.

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