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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds genuinely new context beyond that: the returned fields, the notion of per-zone AI permissions ('what the AI may do there'), and the auth/setup requirement (API token via the Sites & Apps page, no server needed).

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?

Two tight sentences with the resource and the 'start here' directive front-loaded. No filler, and the setup/auth note is compressed into one clause.

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 and no parameters, the description carries the burden of telling the agent what comes back, and it does so by listing status, plan, name servers and permissions. Combined with the entry-point guidance and auth context, an agent has everything needed to call it correctly.

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?

This tool takes zero parameters, so the absence of parameter discussion is expected and the baseline of 4 applies. Nothing in the description misrepresents the no-argument nature of the call.

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?

It names the specific resource (Cloudflare zones/domains the user connected) and enumerates what each entry carries (status, plan, name servers, permissions). The line 'Start here before any other cf_ tool' distinguishes it from the many cf_dns_*, cf_firewall_* and cf_analytics siblings.

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 an explicit sequencing rule ('Start here before any other cf_ tool'), which is exactly the routing guidance an agent needs when facing dozens of cf_ tools. It stops short of naming when *not* to use it or which specific sibling to follow with, so it is clear context rather than full when/when-not coverage.

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