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

There are no annotations provided, so the description carries the burden of behavioral disclosure. It reveals the content of the offer (first 100 bookings free, then 5% commission), which is useful. However, it does not explicitly state that this is a read-only operation, nor does it describe the return format or any additional behavioral aspects. The description provides some context but not comprehensive transparency.

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 that conveys the core purpose and a key detail about the offer. It is reasonably concise, though the phrase 'the cheapest tours marketplace' is a marketing claim that adds no functional information. Still, it does not bloat the description significantly, so it earns a 4 rather than a 5.

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 tool with no parameters and no output schema, the description provides adequate context: it explains what the tool returns (operator offer and pricing) and even specifies the pricing structure. It does not mention the response format, but given the simplicity of the tool, the description is fairly complete. A 4 is appropriate for its coverage of essential details.

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, and the schema coverage is 100% (vacuous). According to the rubric, a baseline of 4 is appropriate when there are no parameters to document. The description does not need to add parameter semantics, and it doesn't—it focuses on the offer details, which is sufficient.

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 function: 'Get 1001locals' operator offer and pricing.' It specifies a particular resource (operator offer) and differentiates it from siblings that deal with experiences, categories, or locations. The verb 'Get' is precise and aligned with the tool's likely read-only nature.

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 context is clear: use this tool when you need the operator offer and pricing details. It doesn't explicitly mention alternatives or exclusions, but given the absence of parameters and the unique topic (offer/pricing) among siblings, the usage is self-evident. A score of 4 reflects the clear context without an explicit 'when not to use'.

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