get_user_carts

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

There are no annotations provided, so the description carries the full burden of behavioral disclosure. The word 'Get' implies a read-only operation, which is safe, but the description doesn't mention what happens if the user doesn't exist, the return format, or whether an empty list is returned. This is acceptable for a simple retrieval tool but lacks explicit behavioral context.

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, concise sentence that is front-loaded with the action and resource. Every word earns its place, with no extraneous content.

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 simplicity of the tool (one parameter, no output schema), the description provides enough context to understand its core purpose. However, it doesn't mention the return structure or edge cases, which would enhance completeness. It's still fairly complete for a straightforward read operation.

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 has only one parameter, userId (integer >0), with 0% schema description coverage. The description compensates by explicitly stating 'by their user ID', which clarifies the parameter's purpose and meaning. This adds value beyond the schema, though it could be more explicit about the expected format or origin of the ID.

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 all shopping carts for a specific user by their user ID' uses a specific verb ('Get') and resource ('shopping carts') with a clear scope ('for a specific user'). It distinguishes itself from siblings like list_carts (which likely returns all carts) and get_cart (which likely returns a single cart).

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 clearly states that this tool retrieves carts for a specific user, implying it should be used when you have a user ID and need that user's carts. However, it does not explicitly mention alternatives or exclusions (e.g., when to use list_carts or get_cart), so it falls short of a 5.

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