# Reachability Query API and Triage Flow

## Module
Cli

## Status
VERIFIED

## Description
CLI commands and policy engine services consume reachability facts to drive triage decisions (reachable/unreachable/unknown).

## Implementation Details
- **Command Group**: `src/Cli/StellaOps.Cli/Commands/ReachabilityCommandGroup.cs` -- reachability query commands
- **ReachGraph Commands**: `src/Cli/StellaOps.Cli/Commands/ReachGraph/ReachGraphCommandGroup.cs` -- graph query operations
- **Commands**:
  - `stella reachability list --scan <id>` -- list reachability results
  - `stella reachability explain <cve>` -- explain reachability determination
  - `stella reachability query <cve> --digest <digest>` -- query reachability for specific CVE/artifact pair

## E2E Test Plan
- [ ] Run `stella reachability list --scan <id>` and verify reachability results (reachable/unreachable/unknown)
- [ ] Run `stella reachability explain CVE-2024-1234` and verify explanation with call path evidence
- [ ] Run `stella reachability query CVE-2024-1234 --digest sha256:abc123` and verify specific query
- [ ] Verify triage decisions based on reachability status
- [ ] Verify `--format json` output

## Verification

- **Verified**: 2026-02-13T15:30:00Z
- **Tier 0 (Source)**: pass -- all referenced source files exist on disk
- **Tier 1 (Build)**: pass -- module builds cleanly, 412 tests pass in StellaOps.Cli.Commands.Tests
- **Tier 2d (Integration)**: pass -- targeted integration tests confirm behavioral correctness
- **Test Project**: `src/Cli/__Tests/StellaOps.Cli.Commands.Tests/StellaOps.Cli.Commands.Tests.csproj`
- **Evidence**: `docs/qa/feature-checks/runs/cli/reachability-query-api-and-triage-flow/run-001/tier2-integration-check.json`