ebay_opt_in_to_program

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

The description gives no behavioral details beyond the bare action. There is no mention of side effects (e.g., whether opting in is reversible), required permissions, or what happens if already opted in. With zero annotations, this is a critical gap.

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 single sentence is too sparse; it is under-specified rather than concise. While short, it fails to convey essential information, making it wasteful in a different sense.

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 tool's nature (a mutation with nested parameters and no output schema), the description is severely incomplete. An agent needs to know program options, opt-in effects, and how to interpret responses; none of this is provided.

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 is fully covered (100%), but the description adds nothing beyond the schema's minimal 'Program opt-in request'. The meaning of 'programType' is not clarified (e.g., valid values), leaving the agent with insufficient semantic depth.

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 explicitly states the action ('Opt-in') and the resource ('seller program'), making the purpose clear. However, it does not elaborate on the types of programs, which could help distinguish from siblings like 'ebay_opt_out_of_program'.

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 is provided on when to use this tool versus alternatives such as 'ebay_opt_out_of_program' or 'ebay_get_opted_in_programs'. The agent receives no context about prerequisites or preferred scenarios.

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