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

Annotations declare readOnlyHint=false, openWorldHint=true, idempotentHint=false, and destructiveHint=false. The description adds useful auth context by stating that an API key or OAuth token is needed and that the code comes from a payout email, but it does not explain what mutation occurs or whether the confirmation is final.

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?

The description is very short with no filler, but it front-loads authentication prerequisites rather than the tool's action. It is concise yet lacks the sentence that would make the purpose clear and actionable.

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 one-parameter tool with annotations covering its safety profile, the description still omits what the tool does and when to use it. An agent cannot choose between this and sibling tools such as partner_confirm from the description alone.

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 the schema already describes 'code' as 'The emailed code.' The description's 'The code from the payout email' adds marginal source context but no new syntax or format detail. Baseline 3 applies when the schema already documents parameters.

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 only states prerequisites ('Needs your API key or OAuth token') and the code source; it never says what the tool does, such as confirming payout details. It does not distinguish this tool from sibling tools like partner_confirm or partner_payout_method.

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 guidance on when to use this tool versus alternatives such as partner_confirm, partner_payout_method, or partner_link. The only usage-like information is an authentication prerequisite, not a selection condition.

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