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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds value by revealing behavior beyond annotations: it returns connect_url when credentials are missing and enumerates the authenticated/pending[] response shape—useful context for agents needing URLs or status. It doesn't mention rate limits or exact URL formats, but for a simple status tool, this is reasonably transparent.

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 sentences, highly scannable. The description front-loads the core purpose, then specifies response behavior conditionally. Every phrase earns its place—no fluff, which is ideal for an agent parsing descriptions.

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 zero-parameter, read-only utility with strong annotations, the description fully captures what an agent needs: what it returns, the meaning of fields, and the conditional behavior when credentials are missing. No output schema exists, but the description covers the key return values, so nothing critical 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?

The tool has zero parameters, so there's no parameter semantics to add. The description correctly avoids inventing parameter details, and the schema coverage is 100% (trivially). A baseline of 4 is appropriate for zero-parameter tools since the description simply doesn't need to explain parameters.

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 clearly states the tool returns connection status (authenticated, pending[]) and URLs, using specific returned fields. While the verb 'connect' is a noun here, the description clarifies it represents a status check. It differentiates itself from siblings by focusing on status and URLs, though it doesn't name a specific sibling.

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 when to use this tool—to check connection status and get URLs—and contrasts with the authenticated vs. pending states, implying usage for connectivity checks. It doesn't explicitly name alternative tools but the sibling list suggests alternatives like 'authenticate' for initiating auth flows. The lack of explicit exclusion keeps it from a 5.

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