get_mouser_cart

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=true, so the safety profile is known. The description adds 'does not modify the cart,' which is redundant with readOnlyHint but reinforces the behavior. No additional behavioral traits (e.g., errors, rate limits) are disclosed, so the score stays at the baseline.

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 two short sentences, immediately front-loaded with the core purpose ('Read one Mouser cart') and a clear safety note. Every word earns its place, with zero redundancy or filler.

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?

For a simple read-only tool with one parameter and no output schema, the description covers the basic purpose and safety. However, it does not describe what the returned cart data contains or how to obtain a cart_key. Given the absence of an output schema, more detail on the return value would make it more complete.

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 schema has one required parameter, cart_key, but the description does not mention it at all. Schema description coverage is 0%, so the description should compensate by explaining the parameter's purpose or format. The parameter name is somewhat self-explanatory, but the description offers no guidance beyond that, so compensation is minimal.

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 ('Read') and the resource ('one Mouser cart'), and explicitly notes it does not modify the cart. This distinguishes it from sibling tools like preview_mouser_cart_change and execute_mouser_cart_change, which involve modifications.

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 implies usage: use this tool when you need to read a Mouser cart without modifying it. This is clear given the 'does not modify' statement, but it does not explicitly name alternatives or exclusions, so it falls just short of a top score.

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