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

Annotations already declare readOnly, idempotent, and non-open-world, so the safety bar is met; the description goes further by disclosing sort order ('most sighting days first'), the row payload (first/last sighting day, days sighted in 7 and 30, sensors, per-sensor 30-day presence strip), and the key caveat 'presence per day, without volume.' That caveat is behavioral context an agent cannot get from the schema. It doesn't mention pagination behavior, though limit caps at 50.

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?

Four sentences, front-loaded with the core purpose and ordering, then definition, then disambiguation, then filters. Efficient overall, but the parenthetical lineage '(cited by VulnCheck KEV and published as daily lists by CIRCL Vulnerability-Lookup)' is dense and consumes space without changing how the tool is called.

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?

There is no output schema, so the description carries the return-value burden and does so completely: row contents, per-sensor detail, and the presence-banding caveat. Combined with annotations covering the safety profile, an agent has everything needed to call and interpret results.

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 every parameter is described there, including enums and defaults. The description only restates window (7|30, default 7), kev (0|1), and limit (1..50) without adding interpretation beyond the schema. Baseline 3 applies since the schema carries the semantics.

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?

Opens with a precise naming of verb and resource: CVEs a named sensor network recorded in the last 7 or 30 days, plus the ordering. The second sentence defines what a 'field sighting' actually is and which sources produce it, so an agent knows exactly what this returns rather than guessing from the name.

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?

The qualifier 'a sighting stays apart from the exploitation claims and from CISA KEV' tells the agent this is presence/targeting evidence, not exploitation evidence, which effectively routes it away from exploitation-oriented siblings. It doesn't name a specific alternative tool (e.g. get_scoreboard or get_chains) or state exclusions explicitly, so it stops short of full when/when-not guidance.

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