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 safe and idempotent behavior is well covered. The description adds the useful detail that it reports token status and connected account count, which is extra behavioral context beyond the annotations. It doesn't describe what happens if the API key is invalid or what the exact response looks like, but for a ping/monitoring tool this is adequate.

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?

The description is two sentences with no fluff. It front-loads the primary purpose (connectivity and API key verification) and adds the secondary reporting detail concisely. Every word contributes meaning.

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, idempotent diagnostic tool, the description is complete. It states what the tool does, what it reports, and the annotations cover the safety profile. There is no missing information an agent needs to decide when to call this tool or to interpret the result.

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 and the schema defines no properties, so there are no parameter semantics to clarify. With no parameters, the baseline is 4; the description does not introduce any param-related confusion and correctly leaves param handling entirely to the schema.

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 states a specific purpose: verifying ADSAP MCP server connectivity and API key, with a second clause clarifying it also reports Google Ads connection state. This is precise and distinguishes it clearly from sibling tools that perform operations or queries on ads data.

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 this is a diagnostic tool for checking connectivity and authentication status, which is the standard use case for a ping. It doesn't explicitly exclude alternatives, but the nature of the tool makes its use case self-evident, and no sibling tool serves the same ping/connectivity check function.

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