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

Annotations declare readOnlyHint/idempotentHint true and the description explains exactly why: it 'opens nothing by itself' and only returns instructions. That is real added value beyond the annotations, plus it tells the agent the follow-up must happen via cotlet_browser_* in the user's Cloud Browser session.

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 operational core is front-loaded and clear, but the closing note about PeopleHR's REST API v4.0 and the absence of an official MCP server (with a check date) is trivia that does not help an agent select or invoke the tool.

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 properly explains the return (step-by-step screens, buttons, fields), which is the essential piece. It omits, however, how the request to approve is located given zero parameters, so an agent cannot tell whether it must open the request in the browser first.

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, so the baseline of 4 applies. The description does not invent or misstate any inputs, though it also never explains how the target request is identified when no arguments are accepted.

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 ('approve holiday request') and, crucially, clarifies that the tool returns step-by-step screens/buttons/fields rather than performing the approval. This distinguishes it from a plain action tool, but the leading 'Approve...' phrasing still reads like a mutation until the second sentence corrects it, and the decline sibling is never referenced.

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?

Implied usage is clear (approve a holiday request; then carry it out with cotlet_browser_* tools), and the handoff to browser tools is spelled out. However, there is no explicit when-not guidance and no comparison to the decline/list siblings or to going straight to the browser without the guide.

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