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

Annotations already provide readOnlyHint and idempotentHint, lowering the burden. The description adds valuable context beyond those hints, including data freshness and that the returned content reflects what 'this server currently holds.' No contradiction with annotations exists.

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?

The description is front-loaded with its core purpose and uses three dense sentences. The long middle enumeration is justified because it maps directly to the allowed topic values and clarifies the content of each block, though it is slightly longer than minimally necessary.

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 single-parameter reference tool with a documented enum, output schema, and safety annotations, the description supplies everything needed: what it does, what topics it covers, when to call it, and the freshness angle. No critical invocation detail 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?

Schema coverage is 100% and the enum values are individually described, so the baseline is 3. The description adds semantics by explaining what each block means — for example, 'BOD 26-04 remediation timeline table and what each tier means' and 'value domains' for KEV fields — which helps an agent pick the correct topic value.

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 action ('Decode the vocabulary the other CISA tools take as input') and names the concrete resource blocks it serves, such as KEV fields, SSVC values, sectors, and advisory ID formats. It clearly positions itself as the reference/vocabulary tool rather than a search- or advisory-fetching sibling.

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 explicit usage triggers: 'Call this before constructing filters for cisa_search_kev or cisa_search_ics_advisories, and whenever another tool's recovery hint points here.' It does not enumerate when-not-to-use scenarios, and a sibling like cisa_get_ssvc could plausibly overlap on SSVC values, so the guidance is strong but not fully exclusionary.

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