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

Annotations already declare readOnly/idempotent/non-destructive, and the description adds real value on top: it discloses that payment-method and tax setup are not yet available, names two accepted auth mechanisms, and gives a security constraint plus a support escalation path. No return format or pagination details are given, but the safety and scope picture is well covered.

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?

Purpose is front-loaded before the auth parenthetical, and each later sentence (action modes, read-only limitation, security warning) carries distinct information. The auth parenthetical is dense and slightly interrupts the flow, but nothing is pure 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?

For a two-parameter read-only tool with no output schema, the description covers the essentials an agent needs: what each action returns, how to authenticate, what is not supported, and where to escalate. Missing details on result shape and pagination are minor given the read-only, low-complexity surface.

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% and both parameters are fully documented there, including the action enum values and the Bearer-header alternative, so the description largely restates the schema. The note that 'settings' is the effective default is useful but is already implied by the schema text.

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 clear verb+resource ('View your payout status') and enumerates the two modes of data it returns (payout method/threshold, amount owed and earnings). It is specific enough that an agent will not confuse it with siblings like subscriptions or reporting, though it does not call out those siblings explicitly.

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?

Distinguishes the two 'action' values and their outputs, and gives a clear usage rule for authentication (use the existing Bearer session rather than prompting the user for an sk_ token). It lacks explicit when-not-to-use guidance or mention of adjacent tools such as reporting/subscriptions.

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