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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds useful context by naming the target URL (mink.is/booknow) and clarifying that this is a handoff, not a booking creation. However, it does not describe the return format or behavior for invalid inputs beyond what the schema implies.

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 sentences, front-loaded with the action and target, and contains no filler. Every word contributes to understanding what the tool does and when to use it.

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 two-parameter tool with strong annotations and clear schema, the description is nearly complete: it covers purpose, usage timing, and key parameter roles. A slight gap is the lack of an explicit return value description, though 'Generate a pre-filled booking URL' makes the output obvious.

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?

Schema coverage is 50%, with 'date' documented and 'participants' only having type/range/default. The description adds minimal semantic value by mentioning 'participant count' and confirming both values get embedded in the URL, but it does not elaborate on participants beyond what the schema already provides.

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: 'Generate a pre-filled booking URL that opens mink.is/booknow with the date and participant count already selected.' It identifies a specific verb, resource, and output, and distinguishes itself from sibling tools like check_availability and get_pricing by positioning itself as the final checkout handoff step.

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 provides clear usage context: 'Use this as the final step in a booking conversation to hand the visitor off to checkout.' This tells the agent when to invoke it, though it does not explicitly mention when not to use it or name alternative tools.

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