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

Annotations declare readOnlyHint=true, and the description adds that it is a health check with a GET endpoint, which is consistent. However, it doesn't disclose response format or any rate-limit/error behavior. With annotations covering safety, a score of 3 is appropriate for minimal added behavioral context.

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 extremely concise: one sentence with a dash clarification and an endpoint reference. Every word earns its place, and it's front-loaded with the key action.

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 ping tool, the description covers the essential purpose and endpoint. It lacks return value/response details, but since there is no output schema, the description could have explained what the response looks like. Still, the tool is simple enough that the current description is nearly complete.

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 no parameters, and the schema is empty. The description doesn't need to explain parameters. The baseline of 4 for zero parameters applies, and the description adds no unnecessary details.

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 uses a specific verb ('health check') and clearly states the resource (API) and what it verifies (reachability and credentials). It distinguishes this tool from the sibling tools, which are all get/list/update/search operations, by making it a connectivity test.

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 clearly implies when to use it: to verify API reachability and credential validity. It doesn't explicitly exclude alternatives, but given the tool's unique purpose among the siblings, the context is sufficient. No explicit alternatives are needed.

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