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

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 Pass 1 (after ln-511 and ln-513)
• 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