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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and non-destructive, so safety is covered. The description adds useful content about what the report contains (coverage, counts, SHA256 provenance), but says nothing about whether it hits remote sources, how current the check is, or any latency/caching behavior implied by openWorldHint.

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 front-loaded sentence that enumerates the reported fields with no filler. It is slightly telegraphic (no explicit subject/verb for the tool's purpose), but every word earns its place.

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 an output schema present, the description need not explain return values, and it does not need to cover parameters. What remains thin is the openWorld dimension — an agent might want to know this reaches external sources and may be slow — but otherwise an agent can call this correctly.

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 takes zero parameters, so the baseline is 4; there is nothing for the description to disambiguate. It correctly avoids inventing parameter semantics that the empty schema does not support.

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 names a concrete verb-and-content set — reporting source dates, coverage, record counts and SHA256 provenance — which is distinct from sibling tools like search or detail. It stops short of a 5 because it never explicitly contrasts itself with siblings such as detail or document, so the agent must infer the boundary.

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 statement of when this tool should be called, when it should not, or which sibling to use instead (e.g., detail or document for record-level inspection). The 'freshness' name plus 'actual source dates' only weakly implies a data-currency check.

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