ebay_get_compatibilities_by_specification

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

The description states 'Get compatibilities', implying a non-destructive read operation, but no annotations are provided. It does not disclose any behavioral traits such as rate limits, authentication requirements, data freshness, or pagination. Given the absence of annotations, the description should provide more context but is minimal.

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, which is concise but lacks important details that could be included without being verbose. It is front-loaded but too minimal for a tool with complex nested input and many siblings.

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?

Without annotations or an output schema, the description should explain what the tool returns, how many results to expect, and how to construct the specification object. It fails to provide this context, leaving the agent underinformed about the tool's behavior.

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 covers all parameters (100% coverage) with descriptions for each nested property (categoryId, categoryTreeId, compatibilityProperties). The description adds no additional meaning beyond what the schema already provides, so it meets the baseline expectation.

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 'Get compatibilities by specification' clearly indicates a read operation on compatibility data using a specification object. However, it could be more specific about what 'compatibilities' are (e.g., vehicle/parts fitments) to better differentiate from similar tools like ebay_get_product_compatibilities.

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 alternative compatibility tools (e.g., ebay_get_product_compatibilities, ebay_get_compatibility_property_values). This lack of context forces the agent to rely solely on the name and parameters to decide, which may 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.