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

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=false, so safety is covered. The description adds genuinely new behavioral context: data is read directly on the installation and is therefore accurate immediately after an update, and the slug field may be null with a stated cause and consequence. This goes well beyond the annotation surface.

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?

Purpose is front-loaded and every clause carries information, but the null-slug explanation and the repeated emphasis on slug-vs-display-name make it longer than strictly necessary. Dense rather than wasteful, so a 4.

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?

There is no output schema, so the description carries the full return-value burden and does so: each entry has a display name, a slug in parentheses that may be null, and the reason and downstream consequence of that null. Nothing needed to call or interpret the tool 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?

Schema description coverage is 100% with a single documented 'domain' parameter, so the schema already carries the parameter semantics. The description adds nothing about the domain argument itself. Baseline 3 is appropriate when the schema does the heavy lifting.

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+resource: lists WordPress plugins and themes that have an available update, including the current→available version transition. It explicitly differentiates itself from the sibling get_wordpress_status by calling that tool's output only a bare counter. An agent can distinguish it from get_wordpress_sites and get_wordpress_status without opening any 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?

Explicitly routes the agent: use this instead of get_wordpress_status when the concrete affected plugins/themes matter. It also gives downstream usage rules — the slug goes to update_wordpress_item/set_wordpress_plugin_state, never the display name — and states a when-not condition (entries whose slug is null cannot be fed to those tools). When-to-use, alternatives, and exclusions are all present.

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