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docs/features/checked/scanner/feature-flag-gate-conditions-in-reachability-verdicts.md

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+# Feature Flag Gate Conditions in Reachability Verdicts
+
+## Module
+Scanner
+
+## Status
+VERIFIED
+
+## Description
+Detects feature flag gates on reachability paths and marks paths as "conditionally reachable" with specific flag name/condition requirements. Gated paths receive 0.5x confidence multiplier.
+
+## Implementation Details
+- **Feature Flag Detector**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/Detectors/FeatureFlagDetector.cs` - Detects feature flag conditions on reachability paths
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/Detectors/IGateDetector.cs` - Gate detector interface
+- **Gate Models & Scoring**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/GateModels.cs` - Gate models including feature flag conditions
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/GatePatterns.cs` - Pattern matching for feature flag detection
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/GateMultiplierCalculator.cs` - Applies 0.5x confidence multiplier for feature-flag-gated paths
+- **Rich Graph Annotation**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/RichGraphGateAnnotator.cs` - Annotates rich graph with feature flag gate information
+- **Conditional Reachability**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Dependencies/ConditionalReachabilityAnalyzer.cs` - Marks paths as "conditionally reachable"
+
+## E2E Test Plan
+- [ ] Scan an image with code behind feature flags (e.g., `if (featureEnabled("X"))`) and verify paths are detected as conditionally reachable
+- [ ] Verify the feature flag name/condition is captured in the reachability verdict
+- [ ] Verify gated paths receive 0.5x confidence multiplier in risk scoring
+- [ ] Verify rich graph annotations include feature flag gate details
+- [ ] Verify reachability status shows "conditionally reachable" vs "reachable" distinction
+
+---
+
+## Verification
+
+| Check | Result |
+|-------|--------|
+| Tier 0 - Source files exist | PASS |
+| Tier 1 - Build + code review | PASS |
+| Tier 2 - Integration tests | PASS |
+| Verified | 2026-02-13T18:10:00Z |