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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does disclose that the tool sends a PDF and explicitly states a key behavioral constraint: never generate or assume email addresses, which adds useful context. However, it does not describe potential side effects such as what happens if the tourId is invalid, whether the email could fail, or what response/confirmation the user should expect. This is a moderate level of transparency, but gaps remain.

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 extremely concise and front-loaded. The first sentence immediately states the trigger condition, and the second paragraph provides the essential behavioral detail in two short sentences. There is no redundant or filler content. Every sentence earns its place, making it easy for an agent to parse quickly.

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 tool's low complexity (2 parameters, no nested objects, no output schema) and the rich schema descriptions, the description provides a complete-enough picture for an agent to invoke it. It covers the purpose, the email collection workflow, and the action taken. However, it lacks information about what happens after sending (e.g., success confirmation or error handling), which would be helpful since there is no output schema to clarify return values.

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 already provides 100% coverage of both parameters with detailed descriptions: 'email' includes format, pattern, and instruction to ask the user if not provided; 'tourId' is described as required with constraints. The tool description adds little beyond reinforcing the email requirement, which is already in the schema. Since schema coverage is high, the baseline is 3, and the description does not significantly augment the schema's information.

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 sends a tour brochure (PDF) to a specified email address using the precise verb 'sends' and resource 'tour brochure (PDF file)'. The leading phrase 'Use this when the user requests a tour brochure or PDF to be sent to their email' precisely identifies the trigger, distinguishing it from sibling tools like tourradar_web-tour-booking or tourradar_web-ask-question.

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 explicitly states when to use the tool: 'Use this when the user requests a tour brochure or PDF to be sent to their email.' It also provides clear prerequisites and handling instructions: ensure the user has provided their email, ask if not, and never generate or assume email addresses. However, it does not mention when not to use it or name alternative tools, so it misses the 'when-not' component 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.