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

No annotations are provided, so the description carries full burden for behavioral disclosure. It does not state whether the tool is read-only, whether it makes external network calls, what it returns, or if any authentication is required. The phrase 'API connectivity' hints at network activity but doesn't clarify side effects or response format, leaving significant ambiguity.

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 a single concise phrase listing four relevant aspects. It is front-loaded and contains no filler or redundant information. For a no-parameter tool, this level of brevity is appropriate and efficient.

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?

Despite the tool's simplicity, the description is incomplete because there is no output schema and no behavioral details. It lists topics (server health, version, tool status, API connectivity) but doesn't explain what the response looks like, whether results are aggregated, or how to interpret potential errors. Given the lack of annotations and output schema, the description should provide more context to be fully useful.

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 input schema is empty with 100% schema description coverage (vacuously). Per the rubric, 0 parameters earns a baseline of 4. The description adds no parameter-specific meaning, but none is needed.

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 lists the tool's scope: server health, version, tool status, and API connectivity. It conveys the resource being queried, and the name 'health_check' reinforces that it checks system status. However, it lacks a specific verb (e.g., 'Checks' or 'Returns'), so it's not a fully explicit action statement, but it is distinct from the SEO-focused sibling tools.

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?

No guidance is provided on when to use this tool versus alternatives. The description doesn't mention any use cases, prerequisites, or exclusions. Given the sibling tools are all distinct, the description offers no contextual clues for selection, leaving the agent to infer.

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