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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so 'read-only' in the description adds nothing new. 'Runs straight away' gives a small hint that results return synchronously with no polling, but nothing is said about what 'latest' means when no scan exists or how stale results can be.

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 short sentences, front-loaded with the action and resource. The trailing 'Through Royally:' phrasing is slightly awkward filler but costs little.

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 is the only place an agent could learn what the results contain (counts, severities, findings, timestamps), and it offers none of that. It is adequate for selecting the tool but thin for interpreting the response.

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 single site_id parameter is fully described with its enum value and URL, so the schema carries the meaning. The description's '(site: demo.royalplugins.com)' merely restates the lone enum value rather than adding 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?

The description gives a specific verb ('Get') and resource ('latest vulnerability scan results'), so the agent knows this retrieves results rather than initiating a scan. It does not explicitly name the sibling gp_run_vulnerability_scan as the alternative, which keeps it from a 5.

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?

'Get the latest ... results' implies this is the read path versus the run path, but the description never states when to call it instead of gp_run_vulnerability_scan or whether a scan must exist first. Usage must be inferred from the verb.

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