Paths: File paths (shared/, references/, ../ln-*) are relative to skills repo root. If not found at CWD, locate this SKILL.md directory and go up one level for repo root.

Regression Checker

Runs the existing test suite to ensure no regressions after implementation changes.

Purpose & Scope

• Detect test framework (pytest/jest/vitest/go test/etc.) and test dirs.
• Execute full suite; capture results for Story quality gate.
• Return PASS/FAIL with counts/log excerpts; never modifies Linear or kanban.

When to Use

• Invoked by ln-510-quality-coordinator Phase 7
• Code quality check passed

Workflow (concise)

1. Auto-discover test framework per shared/references/ci_tool_detection.md Command Registry (Test Frameworks section).
2. Read docs/project/runbook.md — get exact test commands, Docker setup, environment variables. Runbook commands take priority over auto-detection (per ci_tool_detection.md Discovery Hierarchy).
3. Build appropriate test command; run with timeout (5min per ci_tool_detection.md); capture stdout/stderr.
4. Parse results: passed/failed counts; key failing tests.
5. Output verdict JSON (PASS or FAIL + failures list) and add Linear comment.

Critical Rules

• No selective test runs; run full suite.
• Do not fix tests or change status; only report.
• Language preservation in comment (EN/RU).

Definition of Done

• Framework detected; command executed.
• Results parsed; verdict produced with failing tests (if any).
• Linear comment posted with summary.

Reference Files

• Risk-based limits used downstream: ../shared/references/risk_based_testing_guide.md
• CI tool detection: shared/references/ci_tool_detection.md

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Version: 3.1.0 Last Updated: 2026-01-09