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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), yet the description adds substantial value beyond them: versions are self-reported, not observed, reports can be stale by months, and the tool returns a freshness count so the answer can be qualified. That is exactly the kind of caveat an agent needs.

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?

Front-loads the question and the two calling modes efficiently. It is slightly padded by the marketing-style 'CCPEDIA-unique: no other public source publishes this' sentence, which does not help invocation.

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 carries return-value burden well, describing the distribution, positional verdict, and freshness count. Return shape is still loosely specified, but sufficient for correct invocation.

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 100% and already documents the version string. The description goes further by explaining the semantic effect of supplying it (locating your exact position and whether you are early, typical, or dangerously behind) versus omitting it.

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 verb+resource: reports the DSO-approved validator fleet as a version distribution. It explicitly differentiates from the sibling get_upgrade_status by saying that tool handles the pass/fail rule, so an agent can route correctly.

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?

Gives explicit when-to-use instructions: call with no version for the whole distribution, pass your own version to get your position (early/typical/behind). It also names the excluded case and the alternative tool for it.

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