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

Annotations already declare readOnlyHint=true, destructiveHint=false and idempotentHint=true; the description adds the crucial non-obvious behavior that it "opens nothing by itself" and only returns procedural guidance, which explains why a write-sounding tool is safely read-only. It also discloses the presence of an official REST API and a read-only MCP server as alternatives, though it gives no detail on guidance format or length.

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 behavior and the hand-off to cotlet_browser_* tools are stated up front in one sentence. The trailing API/MCP paragraph is slightly tangential and the "checked 23 Oct 2026" note is odd, but it is short and does add an alternative route an agent might consider.

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 does explain what comes back (screens, buttons, fields) and that nothing is executed. However, it never explains how the target booking is identified when no arguments exist — presumably from conversation context — leaving an operational gap for a seven-sibling booking workflow.

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 (schema is an empty object with additionalProperties false, 100% coverage), so there is nothing for the description to disambiguate at the parameter level. Baseline 4 applies for a parameterless tool.

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 a specific verb pair and resource ("Approve or decline booking in the user's own Resource Guru account") and immediately clarifies that the tool itself only returns step-by-step instructions rather than performing the action. It does not explicitly differentiate from nearby Resource Guru siblings such as resource_guru_confirm_tentative_booking or resource_guru_create_booking, which are arguably the closest alternatives.

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 clear workflow guidance: get the step-by-step screens/buttons/fields first, then carry out the action with the cotlet_browser_* tools in the Cloud Browser. It never states when NOT to use it or when to prefer the sibling booking tools or the official API/MCP route, so the routing is implied rather than explicit.

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