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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful non-schema context — that the call costs 5 prepaid credits and requires production billing — but says nothing about what the gap report contains or how results are shaped, so it is only a partial addition.

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, with the core operation front-loaded and the billing constraint clearly separated. Nothing is redundant, though the brevity comes at the cost of substance rather than from tight editing of rich content.

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 tool with two untyped required array parameters and no output schema, the definition does not describe expected input element structure or what the resulting gap report expresses. Only the cost constraint is fully covered, leaving an agent unable to construct confident calls.

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 0% for both required array parameters, so the description carries the full burden. The phrase 'evidence IDs' hints that the evidences array holds identifiers, but nothing explains the element shape for required_controls, whether IDs must match, or whether extra properties are tolerated — the gap is largely unaddressed.

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 and resource pair: compare required operational controls against current evidence IDs, producing a gap report. That is concrete enough to distinguish it from siblings like privi_pro_policy_coverage or privi_pro_delegation_review, though it does not explicitly name or contrast any alternative.

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 explicit guidance on when to use this tool versus the many other assessment tools (policy coverage, data freshness, delegation review). Usage is only implied by the words 'required operational controls' and 'evidence IDs', and no prerequisites, exclusions, or alternatives are given.

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