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

With no annotations, the description carries the full burden of behavioral disclosure. It mentions 'Free' and 'Liveness' but does not explain what 'settled-call counters per route' means concretely, nor does it disclose rate limiting, response format, or error behavior. The description adds minimal context beyond the name.

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, using a single sentence with no filler. It front-loads key information ('Free', 'Liveness') and uses efficient punctuation. It earns a high score for efficiency, though it could add a bit more context without much bloat.

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?

Given the simplicity (0 params, no output schema), the description is thin but might be minimally sufficient for a basic health check. However, it lacks detail on what 'settled-call counters' actually measure, and with no annotations or output schema, an agent lacks understanding of return values. More context is needed to be fully 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 0 parameters, so the schema provides nothing. The description adds meaning by explaining what the tool reports (liveness and counters), which is necessary since there are no parameters to document. This is a baseline 4 for a no-parameter tool.

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 clear purpose: it reports liveness and settled-call counters per route. However, it does not explicitly differentiate from siblings like 'st0x_pulse' or 'st0x_registry', which might also provide health-like status. The purpose is clear but sibling differentiation is missing.

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 on when to use this tool versus alternatives. It does not mention any exclusions or specific scenarios. For a health-check tool, one might expect instructions like 'Use when checking service availability' or 'alternative for detailed metrics', but none are provided.

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