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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint=false, so the safe, deterministic, local read profile is covered. The description adds licensing (CC BY 4.0) and citation guidance, which is genuinely beyond the annotations, but says nothing about response shape, freshness, or size of the notes payload.

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?

Two compact sentences that lead with the resource and then the payload contents; nothing is padded. The English/Spanish duplication is arguably redundant, but it mirrors the tool's own lang parameter and is therefore defensible.

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 telling the agent what comes back, and it does so item by item (counts, sources, gaps, license, citation, URLs). For a zero-required-parameter metadata tool this is close to sufficient; permissions and pagination are simply not relevant here.

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 description coverage is 100% and the single 'lang' parameter is fully documented in the schema with an enum and default, so the baseline of 3 applies. The bilingual wording of the description hints at language support but adds no syntax or default information beyond the schema.

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 specific resource — DERATE dataset notes — and enumerates its contents (code count, sources, known gaps, license, citation, download URLs), which separates it from siblings like list_fault_codes or interpret_derate that operate on individual codes. It stops short of explicitly contrasting itself with overlapping siblings such as get_download_links or get_pricing.

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 or when-not-to-use guidance, and no alternative is named. The agent must infer from the content list that this is a metadata/licensing lookup, and must guess the boundary with get_download_links, which also covers downloads.

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