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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds real context beyond them by listing the returned fields, which matters because there is no output schema. It stops short of saying whether the check validates downstream dependencies or requires auth.

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, front-loaded with purpose then return values, with no filler. The bilingual duplication doubles the length, but that appears to be a deliberate localization choice rather than padding.

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 parameterless health check with no output schema, describing the returned fields is the key missing piece and it is supplied. Only minor details such as whether a non-200 or degraded state is reported are absent, which is negligible at this complexity.

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?

Zero parameters, so the baseline is 4 and there is nothing for the description to compensate for. The empty schema is consistent with the stated contract of a parameterless probe.

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 verb and object ('Check that the service is up') and enumerates exactly what comes back (status, service name, version, server time). This makes it unambiguously different from every sibling tool, which are all domain/data operations rather than health checks.

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?

Usage is only implied: an agent can infer this is the connectivity/liveness probe, but the description never says when to call it (e.g., before a batch of calls, on error, for diagnostics) or when not to. No alternative is named.

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