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

The description adds the key behavioral trait that the catalogue is free and requires no payment, which is useful context beyond the schema. However, with no annotations and no output schema, it doesn't disclose the format or structure of the returned catalogue, leaving some uncertainty about how the information will be presented.

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, information-dense sentence that front-loads the core purpose and adds the free/no-payment detail. Every word earns its place.

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 zero-parameter, read-only catalogue tool, the description is largely complete. It could benefit from mentioning the output format or that it's a read-only operation, but the absence of parameters and the simple purpose make the current description sufficient for an agent to invoke it correctly.

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 tool has zero parameters, so the description doesn't need to explain parameter meaning. The baseline for zero-parameter tools is 4, and the description appropriately focuses on what the tool returns rather than inputs.

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 tool's purpose: it lists everything DexL sells with prices, including per-call tools, models, and packaged products. It distinguishes itself from siblings by covering the full catalogue rather than a specific subset like models or price.

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 when to use it: when you need an overview of all offerings and prices. It doesn't explicitly name alternatives like dexl_models or dexl_price, but the catalogue scope is clear enough for an agent to select it for broad pricing questions.

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