ebay_opt_in_to_payments_program

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

With no annotations, the description should fully disclose behavioral traits. It only states 'Opt-in' without indicating side effects, reversibility, permissions needed, or any other behavior beyond the name. This is insufficient for an agent to understand the tool's impact.

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 a single sentence with minimal waste. It is front-loaded and easy to parse, though it sacrifices completeness for brevity.

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?

Given the lack of annotations and output schema, the description should provide more context about the opt-in process, such as preconditions (e.g., onboarding) or what happens after opt-in. The current description is too brief to be considered complete for a tool that modifies account settings.

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?

The input schema provides descriptions for both parameters (100% coverage), so the baseline is 3. The tool description adds no additional meaning beyond the schema, such as clarifying the relationship between marketplaceId and paymentsProgramType or acceptable values.

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 states 'Opt-in to a payments program', which clearly indicates the action and resource. However, it does not differentiate from the sibling tool 'ebay_opt_in_to_program', making it somewhat vague about which specific payments program is being opted into.

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?

No guidance on when to use this tool versus alternatives (e.g., ebay_opt_in_to_program, ebay_get_payments_program_onboarding). Prerequisites or required account state are not mentioned.

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