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

Annotations already declare readOnlyHint=true, destructiveHint=false and idempotentHint=true, and the description is consistent, explicitly stating it 'opens nothing by itself.' It adds behavior the annotations don't carry: the output is a stepwise procedure describing screens, buttons and fields, not a performed action. It does not describe how the target booking is determined, which is a notable omission for a cancel operation.

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 workflow sentence is front-loaded and efficient, but the filler 'from ChatGPT, Claude or any AI agent' and the dated API footnote ('checked 31 Oct 2026') add noise without helping an agent decide or act. The proposition that the tool returns steps rather than acting could be stated more crisply.

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 output schema, the description usefully explains that it returns step-by-step screens/buttons/fields, which is what an agent needs to chain into cotlet_browser_* calls. However, for a 'cancel a booking' tool with an empty input schema it never resolves the central ambiguity of which booking is being cancelled, so the definition is not fully sufficient.

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?

Zero parameters gives a baseline of 4, but the description never explains how the specific booking to cancel is identified when no booking ID or reference is accepted, leaving the agent to infer that the guide is generic. The absence of any booking-targeting parameter and any explanation of it is a meaningful semantic gap rather than a strength.

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 names the resource and action ('Cancel a booking in the user's own ResDiary account') but immediately reframes the tool as a procedure-returning guide rather than an executor: 'Returns how to do it in ResDiary step by step ... and opens nothing by itself.' That reframing is valuable, though the tool name still reads as if it performs the cancellation, so the agent must read past the name to learn the real behavior.

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?

It gives explicit sequencing: call this first to get the screen-by-screen steps, then execute them with the cotlet_browser_* tools in the ResDiary Cloud Browser. It also warns that ResDiary's official APIs are limited to approved integrations, ruling out an API path. It does not compare against sibling booking tools such as resdiary_move_a_booking, but the workflow guidance is clear.

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