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

With no annotations, the description carries the full behavioral burden; it does disclose non-obvious observation semantics—build time as upper bound and no observation time held—plus a refusal behavior for time. However, it does not state read-only/side-effect/auth profile or return behavior, leaving meaningful gaps.

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?

It is short but a single nested sentence with jargon, not front-loaded with the tool's action. The compression makes it harder to parse rather than 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?

For a five-parameter tool with no annotations, no output schema, and zero schema descriptions, this is too incomplete; it explains a conceptual snapshot model but not how to call it or interpret results.

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?

Schema coverage is 0% for five parameters, so the description must compensate. It hints at date, snapshot/index digest, and a refused time ('at'), but ignores required identifier and language, and gives no format/semantics for the rest.

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 never states an action verb and leads with a dense noun phrase; a reader must already know what a 'mounted log build' and 'index digest' are. It gestures at a Luxembourg act state on a date from a specific build, but does not clearly separate this from as_of/status_on/in_force_on siblings.

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 explicit when-to-use or when-not-to-use guidance is given, and the only constraint ('a time refuses') is cryptic and unexplained. It does not name as_of or other temporal siblings, so an agent cannot infer selection criteria.

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