ebay_create_notification_subscription

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states the action 'Create', implying mutation, but does not reveal whether the operation is idempotent, what happens if a subscription with the same topicId/destinationId exists, or any authentication or rate limit considerations. The description is insufficient for an agent to understand side effects.

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 short sentence, which is concise but under-specified. It lacks structure and fails to provide any additional context that would help an agent use the tool correctly. More information could be added without sacrificing conciseness.

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 complexity (4 parameters, nested objects, no output schema, no annotations), the description is very incomplete. It does not explain the purpose of each parameter, how the subscription is used, or what the expected response is. An agent would need to infer too much from the tool name and schema 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 75%, meaning most parameters already have descriptions in the schema (e.g., status, topicId, destinationId). The tool description adds no additional meaning beyond what the schema provides. For the nested payload object, the schema describes format, schemaVersion, deliveryProtocol. The description does not compensate for the remaining 25% undocumented 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 states 'Create a notification subscription', which is a specific verb+resource. It distinguishes 'create' from sibling update/delete/get operations, but it is essentially a tautology of the tool name. It adds no additional context about what a notification subscription entails or how it differs from other subscription-related tools.

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 usage guidelines are provided. The description does not indicate when to create a subscription versus when to update or delete one. It also does not mention any prerequisites, such as the need for a destination endpoint or topic to exist first. This lack of guidance could lead to incorrect tool selection.

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