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

Annotations declare readOnlyHint=false and destructiveHint=true, which alone would leave an agent unsure what the tool actually does; the description resolves this by clarifying it is a credential-retrieval operation and adds two things annotations cannot convey: it is sensitive and it requires the user to have granted the token:read scope. It does not describe failure behavior when the scope is missing, keeping it short of a 5.

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 sentences, front-loaded with the return value, then the recommended usage pattern, then the authorization caveat. No sentence is redundant and the ordering matches how an agent decides to call it.

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 an output schema present, the description needn't explain the returned payload, and it already covers the two things an agent must know before invoking: the scope requirement and why direct API calls are preferred. Nothing material is missing for a zero-parameter retrieval tool.

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 nothing for the description to disambiguate; baseline is 4. The description correctly avoids inventing argument semantics.

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 first sentence states a specific verb and resource ('Returns the account api_token used to call api.audd.io'), which unambiguously separates it from siblings like make_api_request and rotate_api_token. An agent can identify exactly what the tool yields without opening the schema.

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?

It explicitly routes the agent: use this to build an integration and call the API directly rather than proxying each call through make_api_request. That names the alternative tool and the condition that selects this one, which is the strongest form of usage guidance.

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