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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description adds value above that by disclosing the shape of the payload (row counts, quarter range, last-refresh timestamp) despite there being no output schema, plus data provenance. It says nothing about rate limits or authorization, which keeps it from a 5.

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?

Three sentences with no filler, and they are front-loaded correctly: capability first, then the usage condition, then provenance/attribution. Every sentence carries distinct information an agent needs.

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 the burden of describing what comes back, and it does so concretely (table-level row counts, quarter coverage, refresh time). For a zero-parameter read-only metadata tool with full annotation coverage, nothing needed to call it correctly is missing.

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 there is nothing for the description to disambiguate; the baseline for a no-argument tool is 4. The schema is an empty object, and the description correctly does not invent input options.

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 states a specific resource and verb-of-reporting: what FERC EQR data is available and how fresh it is, enumerating the exact metrics returned (row counts for filer-identity, index-publisher and contracts tables, quarter range, last refresh). It is unmistakably distinct from the sibling EQR search/lookup tools, which retrieve data rather than describe its coverage.

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?

It gives an explicit when: 'Use before relying on a result to confirm coverage includes the quarter you care about.' That is a clear triggering condition for an agent. It does not name the sibling tools it should precede or state any when-not conditions, so it stops short of a 5.

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