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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so safety is covered structurally. The description adds genuinely non-annotated behavior: this is a multiplexed tool with a discovery/catalog mode, and the note that the server marks it read-only so it "runs straight away" tells the agent no approval gate will block execution.

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?

Three tight sentences: capability list first, calling protocol second, execution behavior last. Every sentence carries information the agent needs and nothing is repeated.

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 three loosely-typed params (one nested object) and no output schema, the description does the important work of explaining the two-call discovery flow so the agent can learn per-operation arguments. It does not describe the shape of results for each operation (e.g. tree structure of get-menu), but the discovery catalog largely compensates.

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 coverage is 100% and the operation enum is fully enumerated in the schema, so the baseline is 3. The description adds sequencing semantics not captured by the schema: arguments are per-operation and must be discovered from the catalog returned when operation is omitted.

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?

Opens with a specific verb+resource ("Read WordPress nav menus") and enumerates the four sub-operations (list-menus, get-menu, list-locations, render), so the scope is unambiguous. It stops short of naming a sibling alternative (e.g. wp_get_menus or wp_get_menu_items) to differentiate itself, so an agent must infer the routing itself.

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?

Gives an explicit calling protocol: call with no "operation" to list available read operations and their arguments, then call again with { operation, arguments }. That is clear, actionable usage context. It does not say when to prefer this tool over the many sibling menu-reading tools, so no exclusion guidance.

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