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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered by structured data. The description adds genuine value by disclosing the shape of the result (a boolean-like plan/key status plus upgrade links), which annotations cannot convey. It does not mention auth requirements or any rate limiting, so it is solid but not rich.

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?

A single compact sentence with no filler; the key fact (what status is reported) is front-loaded and the secondary detail (upgrade links) trails it. Every clause earns its place.

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 no input parameters and no output schema, the description carries the return-value burden and does describe the returned content (key/plan status plus upgrade links). It could say a bit more about the exact status values, but for a zero-arg read tool this is close to complete.

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?

The tool takes zero parameters, so there is no parameter semantics to explain and the baseline of 4 applies. The description correctly adds no invented argument information.

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?

The description names the concrete resource being inspected (this connection's Wingo UI API key and Pro plan) and what comes back alongside it (upgrade/create-key links), so an agent knows exactly what this call answers. It is a noun-phrase fragment rather than an explicit verb, but the intent is unambiguous and the sibling tools (component/theme/changelog lookups) do not overlap with it.

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?

There is no statement of when to call this tool, no prerequisites, and no named alternative. The only usage signal is implicit in the resource being a plan/API-key check; nothing tells the agent whether to call it before other tools or how often.

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