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

Annotations already flag destructiveHint=true, readOnlyHint=false, and idempotentHint=false, so safety is covered. The description adds genuinely new context: cached objects are lost and rebuilt on demand, and the call is asynchronous, returning an event_id rather than completing inline. That is valuable disclosure beyond the annotations.

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?

Four short clauses, all front-loaded: write classification, action and scope, consequence, async return, and endpoint. No sentence is filler and nothing important is buried.

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 one-parameter mutation with no output schema, the description covers the write nature, the side effect, the asynchronous return value (event_id), and the endpoint. An agent has everything needed to invoke it and handle the response.

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 a single parameter with 100% schema description coverage, so the schema already documents server_id fully. The description only reinforces that the action targets one server and adds no format or constraint detail beyond the schema. 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 (restart) and resource (Redis / object cache) scoped to one server, and the REST endpoint confirms the exact target. It is trivially distinguishable from sibling restart_mysql, restart_nginx, and restart_php tools.

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?

The description implies the use case (cached objects are lost and rebuilt on demand), but never says when to prefer this over spinupwp_purge_object_cache or when a restart is actually warranted. Usage is inferable but not stated.

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