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

Annotations already declare the operation read-only, idempotent, and non-destructive. The description adds useful context beyond those annotations by stating the org:read scope, mapping to the exact GET endpoint, and returning readiness flags that influence signing modes. This is transparent and consistent with the annotations.

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 compact and well-structured: the purpose is stated first, followed by behavioral implications, scope, and endpoint mapping. Every sentence adds meaningful information, and there is no redundant or filler content.

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 status check, the description is complete. It explains the return semantics, the conditions that affect downstream usage, the required scope, and the exact API mapping. Even without an output schema, an agent knows what to expect from the 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 accepts no parameters, and schema description coverage is 100%, so the schema leaves nothing ambiguous. The description still adds value by explaining what the response fields mean, even though it does not need to document 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 checks managed signing availability for Apple and Google wallets and explains the meaning of the returned fields. It does not explicitly differentiate itself from sibling tools like testAppleCertificates or testGoogleConnection, but the resource and behavior are specific enough to avoid confusion.

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 gives a clear use case: checking whether managed signing credentials are available so apps can use signing_mode: 'managed'. It does not explicitly mention alternatives or exclusions, so it falls short of a 5, but the context is sufficient for an agent to select this tool.

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