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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is fully covered. The description adds only the REST endpoint mapping and the rp_ token prefix; it says nothing about behavior when the token is unknown/expired or what the recipient object contains.

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 terse fragments with the key scoping information (one, by token) front-loaded and no filler. The terseness borders on under-specification rather than verbosity, which is the right kind of failure for a simple get.

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?

A one-parameter read tool with rich annotations and no output schema does not need much, and this covers the mechanics. However, nothing explains the recipient resource itself (payout destination, linked to transfers) or failure behavior, which matters given 35 sibling get_* tools an agent must choose between.

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% and the single parameter is documented in the schema with an example token, so the baseline is 3. The description repeats the rp_ prefix convention but adds no constraints beyond the schema's maxLength/minLength.

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 resource (recipient) retrieved by singular token, and the "One recipient by token" phrasing implicitly separates it from pinpayments_list_recipients. It lacks an explicit sibling callout, so an agent has to infer the differentiation from the 'one' vs 'list' wording.

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 only implied: needing a single recipient whose token you already hold. There is no statement of when to prefer this over pinpayments_list_recipients or pinpayments_list_recipient_transfers, and no prerequisite/permission context.

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