Verify credentials and upstream reachability

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

Annotations already cover readOnly, idempotent and openWorld, but the description adds substance beyond them: it performs one authenticated request, never returns the credential itself, and enumerates exactly what is reported. The security-relevant behavior (credential never exposed) is a genuinely useful disclosure the annotations do not carry.

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?

Front-loaded with the mechanism, then the reported outputs, then the call condition, so the ordering is good. It is slightly repetitive ("alexa.amazon.com" three times) and contains a typo ("a alexa.amazon.com-side problem"), which keeps it out of 5 territory.

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 output schema, the description takes on the return-value burden and does so: it lists credential source, acceptance, round-trip time, and the diagnostic hint categories. Nothing an agent needs to choose or call this zero-param 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?

Zero parameters, so there is nothing to disambiguate and the baseline of 4 applies. The description correctly implies the tool is called with no inputs.

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 chain (resolves credential, makes one authenticated request) and the exact resource (alexa.amazon.com), and reads as a diagnostic distinct from action siblings like alexa_speak or alexa_session_status. An agent can tell this is a pre-flight/breakage-locator rather than a functional Alexa control.

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?

"Call this when a real tool fails and you want to know which hop broke" gives a clear trigger condition and framing relative to the other tools. It does not name a specific sibling alternative (e.g. vs alexa_session_status) or state when-not-to-use, so it falls short of a 5.

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