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

No annotations are provided, so the description carries the full behavioral burden, yet it discloses nothing: not whether the call is read-only, whether it transmits error text to a remote service, what a diagnosis result contains, or any limits. The single word 'diagnostic' is not behavioral disclosure.

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 single short phrase contains no filler or bloat, but its brevity comes from under-specification rather than economy; there is no front-loaded actionable content.

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 diagnostic tool with no annotations and no output schema, an agent needs to know what kinds of errors it handles and what the diagnosis returns. The description supplies none of this, leaving the definition functionally incomplete.

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?

With one parameter and 100% schema description coverage ('Sanitized error or log excerpt.'), the schema already documents the input and the description adds nothing. The stated baseline of 3 for high schema coverage applies here.

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 is essentially a restatement of the name: 'reactjs::runtime.diagnose (diagnostic)'. It adds no verb-plus-resource specificity beyond 'diagnostic', and does not say what runtime problems it diagnoses or what it produces, leaving it indistinguishable from siblings like fix.suggest or env.preflight.

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?

There is no when-to-use, when-not-to-use, or alternative-tool guidance at all. The definition does not mention fix.suggest, env.preflight, or shared::runtime.diagnose, so an agent gets no routing help despite a large sibling set.

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