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

Annotations already declare readOnlyHint/idempotentHint/destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds value beyond that by documenting error behavior ('return a clear not-found error instead of guessing an alternative') and the shape of the response (summary + structured report). It stops short of noting rate limits or auth requirements, but for a read-only report runner this is solid.

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-loaded and clearly sectioned with headers, so an agent can scan it quickly. It is somewhat long, and the Outputs section partially duplicates the existing output schema, which is minor redundancy rather than noise.

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 an output schema present, the description needn't explain return values, yet it still summarizes them for chaining guidance. Combined with full schema coverage and rich annotations, nothing an agent needs to invoke this 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?

Schema coverage is 100%, so the schema already documents report_id, filters, and limit, and the description's Inputs section largely restates them. It does add one useful semantic point: report-specific filters and the instruction not to guess report IDs, directing the agent to the catalog. Baseline 3 is appropriate since the schema does the heavy lifting.

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 verb ('Run/Executes') and resource ('predefined report on ZEN SecDB public feed data') and enumerates the domains covered (CVEs, advisories, EPSS, weaknesses, etc.). It clearly separates this aggregate/analytics tool from the sibling lookup tools (vulnerability_info, vulnerability_search).

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?

Explicit when-to-use list (distributions, trends, top-N rankings, timeline summaries) plus an explicit when-not-to-use rule directing single-item requests to the dedicated lookup tools. It also names feed_report_catalog as the discovery route, which is the correct alternative for finding report IDs.

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