health_check_status

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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and openWorld behavior, so the safety profile needs no repetition. The description contributes the useful nuance that this returns cached hourly data rather than performing a check, plus an enablement precondition, but it does not say what is returned when checks are disabled or how stale the result may be.

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?

A single sentence with no filler and the key qualifier ('last hourly') up front. It is terse to the point of being a fragment, but nothing 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?

With no output schema, the description must carry the burden of explaining the return value, and it does not: it never says whether the result includes a pass/fail status, timestamp, or failure details. For a simple no-arg read tool that is an acceptable but real gap.

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 there is nothing to disambiguate; the baseline for a parameterless tool applies. The description adds no misleading hints about inputs, which is appropriate.

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 resource and scope: the stored result of the most recent hourly self-check. The word 'last' implicitly separates it from the sibling health_check_run, which triggers a check, though the description never names that alternative or states that this tool does not run a fresh check.

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 by the parenthetical '(if health checks are enabled)', which hints at a precondition. It never says when to call this versus health_check_run or diagnostics, nor what happens when health checks are disabled.

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