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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds value the annotations do not: the scope of what is listed (registered widgets plus structural elements) and the exact return fields, including the v4 atomic-props flag, which is particularly helpful since no output schema exists.

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 scope front-loaded and no filler. The return-field enumeration in the second sentence is dense but earns its place given the absence of an output schema.

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 simple, side-effect-free list tool with one optional parameter and full annotation coverage, the description supplies what matters: scope and return shape. Minor gaps remain around whether results are paginated/filterable and what 'v4 atomic props' implies for the caller.

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?

There is only one optional parameter (site_id) and schema description coverage is 100%, so the schema fully documents it. The description adds no additional meaning about site_id or multi-site behavior, so the baseline of 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 ('List all registered Elementor widgets'), and even enumerates the structural elements included (container, section, column) plus the returned fields. It is clearly distinguishable from generic list tools, though it never contrasts itself with close siblings like elementor_list_global_widgets or elementor_get_widget_schema.

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?

Usage is only implied: an agent can infer this is a discovery call made before building or inspecting an Elementor page. There is no explicit when-to-use, no when-not-to-use, and no named alternative such as elementor_get_widget_schema for per-widget detail.

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