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

Annotations already cover the safety profile (readOnly, non-destructive, idempotent, closed-world), but the description adds information annotations cannot express: the tool opens nothing and produces only guidance, so the agent must chain into browser tools to complete the task. The note about GetYourGuide's Supplier API explains why the browser route exists, which is useful justification. No return format or failure behavior is described, keeping it below a 5.

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 core point — that it returns a guide and performs no action — is front-loaded and clear. However, the trailing paragraph about the Supplier API and the connectivity-testing criteria, including a 'checked 11 Oct 2026' parenthetical, is lengthy justification that does little to help an agent invoke the tool and crowds the operative instruction.

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?

With no parameters and no output schema, the description carries the burden of saying what comes back, and it does so concretely ('screens, buttons, fields'). It is complete enough to call correctly, though it omits whether the guide varies by task and gives no hint about the size or format of the returned text.

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 takes zero parameters, so the baseline of 4 applies and the description has no parameter semantics to add. It does not mislead about inputs, and the empty schema is consistent with the described behavior.

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?

States a specific verb and resource ('List bookings in the user's own GetYourGuide account') and immediately clarifies that the tool returns step-by-step instructions rather than booking data. That correction is essential because the name otherwise implies it fetches the bookings themselves. It does not explicitly differentiate from the sibling getyourguide_get_booking, which is the main gap.

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?

Gives a clear operating context: call this first, then perform the action with the cotlet_browser_* tools in the GetYourGuide Cloud Browser. It does not state when to prefer getyourguide_get_booking or other GetYourGuide siblings, so routing between GetYourGuide tools is left to inference.

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