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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the agent knows this is a safe, purely local read. The description reinforces that nothing is mutated, and the mention of the echo behavior adds modest context, but it doesn't discuss auth, rate limits, or failure modes beyond what the annotations and output schema already imply.

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?

Two short sentences, the purpose first and the return/echo behavior second. Nothing is padded and no sentence is wasted.

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 one-parameter, zero-required liveness tool with an output schema documenting the return payload and annotations covering the safety profile, the description supplies everything an agent needs: what it checks, when it is useful, and how the input is handled.

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?

Schema description coverage is 0%, so the description must compensate for the single `message` parameter — and it does, explaining that the value is echoed back when supplied, which clarifies it is an optional round-trip probe rather than a filter or identifier. It stops short of noting the null default explicitly.

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 and object ('confirm the server is alive') plus the observable effect ('returns the server name and version'). An agent immediately understands this is a liveness/health probe, and there are no siblings to disambiguate against.

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 name and description jointly signal the use case: verifying server availability before or after other operations. There are no alternatives to name and no explicit when-not condition, but for a single sibling-less health-check tool the context is unambiguous.

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