ebay_bulk_create_ads_by_listing_id

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

No annotations are provided, so the description carries full burden for behavioral traits. It only mentions a batch limit and campaign types, omitting details like idempotency, error handling, duplicate handling, or required prerequisites. This is insufficient for a mutation tool.

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 concise sentences with no wasted words. Clearly states the core action, resource, limit, and campaign type support. Perfectly front-loaded.

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 no output schema, the description should explain return values, but does not. It also lacks information on prerequisites (e.g., campaign must exist), input validation, error responses, or behavior when ads already exist. The tool has nested objects, so more context is needed.

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% with descriptions for all parameters. The description adds 'Supports both CPS and CPC campaigns' which hints at campaignId values, but does not elaborate on bidPercentage or campaignId meaning beyond what schema provides. Baseline 3 is appropriate.

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 clearly states the action ('Create multiple ads') and resource ('using listing IDs'), including a specific limit (500 maximum) and campaign types supported (CPS, CPC). However, it does not differentiate from sibling tools like ebay_bulk_create_ads_by_inventory_reference, which uses a different reference type.

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?

The description provides context by mentioning maximum listings per call and supported campaign types, but does not give explicit when-to-use or when-not-to-use guidance relative to alternatives. The agent must infer which bulk creation tool to use based on input type.

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