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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, and the description's "server marks it read-only, so it runs straight away" mostly restates that. What it does add beyond the structured data is the shape of the response (version + atomic support boolean), which matters because there is no output schema.

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 decision-relevant facts, what it returns and that it should be called first, are front-loaded in two tight sentences. The trailing "Through Royally: its server marks it read-only" sentence is largely redundant with the annotations and slightly noisy.

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 zero-required-parameter read tool with no output schema, the description covers both what comes back and how the result should drive tool selection. Nothing an agent needs in order to call it correctly is missing.

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?

Only one parameter (site_id) and schema description coverage is 100%, with the enum value and its URL documented inline. The description adds nothing about site_id, so the baseline 3 applies.

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 (detect Elementor version) and adds the concrete return payload (version number plus whether v4.0+ atomic elements are supported). An agent knows exactly what it will learn, which no sibling tool provides.

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?

"Call this first to decide whether to use legacy tools (add-free-widget, add-container) or atomic tools (add-atomic-heading, add-flexbox)" gives an explicit ordering rule and names the competing tool families the result routes between. Nothing about when to invoke it is left to inference.

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