initial commit

scripts/execute.py

@@ -0,0 +1,424 @@
+#!/usr/bin/env python3
+"""
+Harness Step Executor - run phase steps sequentially with Codex and self-correction.
+
+Usage:
+    python scripts/execute.py <phase-dir> [--push]
+"""
+
+import argparse
+import contextlib
+import json
+import subprocess
+import sys
+import threading
+import time
+import types
+from datetime import datetime, timezone, timedelta
+from pathlib import Path
+from typing import Optional
+
+ROOT = Path(__file__).resolve().parent.parent
+
+
+@contextlib.contextmanager
+def progress_indicator(label: str):
+    """터미널 진행 표시기. with 문으로 사용하며 .elapsed 로 경과 시간을 읽는다."""
+    frames = "◐◓◑◒"
+    stop = threading.Event()
+    t0 = time.monotonic()
+
+    def _animate():
+        idx = 0
+        while not stop.wait(0.12):
+            sec = int(time.monotonic() - t0)
+            sys.stderr.write(f"\r{frames[idx % len(frames)]} {label} [{sec}s]")
+            sys.stderr.flush()
+            idx += 1
+        sys.stderr.write("\r" + " " * (len(label) + 20) + "\r")
+        sys.stderr.flush()
+
+    th = threading.Thread(target=_animate, daemon=True)
+    th.start()
+    info = types.SimpleNamespace(elapsed=0.0)
+    try:
+        yield info
+    finally:
+        stop.set()
+        th.join()
+        info.elapsed = time.monotonic() - t0
+
+
+class StepExecutor:
+    """Phase 디렉토리 안의 step들을 순차 실행하는 하네스."""
+
+    MAX_RETRIES = 3
+    FEAT_MSG = "feat({phase}): step {num} - {name}"
+    CHORE_MSG = "chore({phase}): step {num} output"
+    TZ = timezone(timedelta(hours=9))
+
+    def __init__(self, phase_dir_name: str, *, auto_push: bool = False):
+        self._root = str(ROOT)
+        self._phases_dir = ROOT / "phases"
+        self._phase_dir = self._phases_dir / phase_dir_name
+        self._phase_dir_name = phase_dir_name
+        self._top_index_file = self._phases_dir / "index.json"
+        self._auto_push = auto_push
+
+        if not self._phase_dir.is_dir():
+            print(f"ERROR: {self._phase_dir} not found")
+            sys.exit(1)
+
+        self._index_file = self._phase_dir / "index.json"
+        if not self._index_file.exists():
+            print(f"ERROR: {self._index_file} not found")
+            sys.exit(1)
+
+        idx = self._read_json(self._index_file)
+        self._project = idx.get("project", "project")
+        self._phase_name = idx.get("phase", phase_dir_name)
+        self._total = len(idx["steps"])
+
+    def run(self):
+        self._print_header()
+        self._check_blockers()
+        self._checkout_branch()
+        guardrails = self._load_guardrails()
+        self._ensure_created_at()
+        self._execute_all_steps(guardrails)
+        self._finalize()
+
+    # --- timestamps ---
+
+    def _stamp(self) -> str:
+        return datetime.now(self.TZ).strftime("%Y-%m-%dT%H:%M:%S%z")
+
+    # --- JSON I/O ---
+
+    @staticmethod
+    def _read_json(p: Path) -> dict:
+        return json.loads(p.read_text(encoding="utf-8"))
+
+    @staticmethod
+    def _write_json(p: Path, data: dict):
+        p.write_text(json.dumps(data, indent=2, ensure_ascii=False), encoding="utf-8")
+
+    # --- git ---
+
+    def _run_git(self, *args) -> subprocess.CompletedProcess:
+        cmd = ["git"] + list(args)
+        return subprocess.run(cmd, cwd=self._root, capture_output=True, text=True)
+
+    def _checkout_branch(self):
+        branch = f"feat-{self._phase_name}"
+
+        r = self._run_git("rev-parse", "--abbrev-ref", "HEAD")
+        if r.returncode != 0:
+            print(f"  ERROR: git을 사용할 수 없거나 git repo가 아닙니다.")
+            print(f"  {r.stderr.strip()}")
+            sys.exit(1)
+
+        if r.stdout.strip() == branch:
+            return
+
+        r = self._run_git("rev-parse", "--verify", branch)
+        r = self._run_git("checkout", branch) if r.returncode == 0 else self._run_git("checkout", "-b", branch)
+
+        if r.returncode != 0:
+            print(f"  ERROR: 브랜치 '{branch}' checkout 실패.")
+            print(f"  {r.stderr.strip()}")
+            print(f"  Hint: 변경사항을 stash하거나 commit한 후 다시 시도하세요.")
+            sys.exit(1)
+
+        print(f"  Branch: {branch}")
+
+    def _commit_step(self, step_num: int, step_name: str):
+        output_rel = f"phases/{self._phase_dir_name}/step{step_num}-output.json"
+        index_rel = f"phases/{self._phase_dir_name}/index.json"
+
+        self._run_git("add", "-A")
+        self._run_git("reset", "HEAD", "--", output_rel)
+        self._run_git("reset", "HEAD", "--", index_rel)
+
+        if self._run_git("diff", "--cached", "--quiet").returncode != 0:
+            msg = self.FEAT_MSG.format(phase=self._phase_name, num=step_num, name=step_name)
+            r = self._run_git("commit", "-m", msg)
+            if r.returncode == 0:
+                print(f"  Commit: {msg}")
+            else:
+                print(f"  WARN: 코드 커밋 실패: {r.stderr.strip()}")
+
+        self._run_git("add", "-A")
+        if self._run_git("diff", "--cached", "--quiet").returncode != 0:
+            msg = self.CHORE_MSG.format(phase=self._phase_name, num=step_num)
+            r = self._run_git("commit", "-m", msg)
+            if r.returncode != 0:
+                print(f"  WARN: housekeeping 커밋 실패: {r.stderr.strip()}")
+
+    # --- top-level index ---
+
+    def _update_top_index(self, status: str):
+        if not self._top_index_file.exists():
+            return
+        top = self._read_json(self._top_index_file)
+        ts = self._stamp()
+        for phase in top.get("phases", []):
+            if phase.get("dir") == self._phase_dir_name:
+                phase["status"] = status
+                ts_key = {"completed": "completed_at", "error": "failed_at", "blocked": "blocked_at"}.get(status)
+                if ts_key:
+                    phase[ts_key] = ts
+                break
+        self._write_json(self._top_index_file, top)
+
+    # --- guardrails & context ---
+
+    def _load_guardrails(self) -> str:
+        sections = []
+        agents_md = ROOT / "AGENTS.md"
+        if agents_md.exists():
+            sections.append(
+                f"## 프로젝트 규칙 (AGENTS.md)\n\n{agents_md.read_text(encoding='utf-8')}"
+            )
+        docs_dir = ROOT / "docs"
+        if docs_dir.is_dir():
+            for doc in sorted(docs_dir.glob("*.md")):
+                sections.append(f"## {doc.stem}\n\n{doc.read_text(encoding='utf-8')}")
+        return "\n\n---\n\n".join(sections) if sections else ""
+
+    @staticmethod
+    def _build_step_context(index: dict) -> str:
+        lines = [
+            f"- Step {s['step']} ({s['name']}): {s['summary']}"
+            for s in index["steps"]
+            if s["status"] == "completed" and s.get("summary")
+        ]
+        if not lines:
+            return ""
+        return "## 이전 Step 산출물\n\n" + "\n".join(lines) + "\n\n"
+
+    def _build_preamble(self, guardrails: str, step_context: str,
+                        prev_error: Optional[str] = None) -> str:
+        retry_section = ""
+        if prev_error:
+            retry_section = (
+                f"\n## ⚠ 이전 시도 실패 — 아래 에러를 반드시 참고하여 수정하라\n\n"
+                f"{prev_error}\n\n---\n\n"
+            )
+        return (
+            f"당신은 {self._project} 프로젝트의 개발자입니다. 아래 step을 수행하세요.\n\n"
+            f"{guardrails}\n\n---\n\n"
+            f"{step_context}{retry_section}"
+            f"## 작업 규칙\n\n"
+            f"1. 이전 step에서 작성된 코드를 확인하고 일관성을 유지하라.\n"
+            f"2. 이 step에 명시된 작업만 수행하라. 추가 기능이나 파일을 만들지 마라.\n"
+            f"3. 기존 테스트를 깨뜨리지 마라.\n"
+            f"4. AC(Acceptance Criteria) 검증을 직접 실행하라.\n"
+            f"5. /phases/{self._phase_dir_name}/index.json의 해당 step status를 업데이트하라:\n"
+            f"   - AC 통과 → \"completed\" + \"summary\" 필드에 이 step의 산출물을 한 줄로 요약\n"
+            f"   - {self.MAX_RETRIES}회 수정 시도 후에도 실패 → \"error\" + \"error_message\" 기록\n"
+            f"   - 사용자 개입이 필요한 경우 (API 키, 인증, 수동 설정 등) → \"blocked\" + \"blocked_reason\" 기록 후 즉시 중단\n"
+            f"6. 변경사항은 워킹 트리에 남겨라. step 완료 후 커밋은 execute.py가 정리한다.\n\n---\n\n"
+        )
+
+    # --- Codex 호출 ---
+
+    def _invoke_codex(self, step: dict, preamble: str) -> dict:
+        step_num, step_name = step["step"], step["name"]
+        step_file = self._phase_dir / f"step{step_num}.md"
+
+        if not step_file.exists():
+            print(f"  ERROR: {step_file} not found")
+            sys.exit(1)
+
+        prompt = preamble + step_file.read_text(encoding="utf-8")
+        last_message_path = self._phase_dir / f"step{step_num}-last-message.txt"
+        result = subprocess.run(
+            ["codex", "exec", "--full-auto", "--json", "-C", self._root, "-o", str(last_message_path)],
+            cwd=self._root,
+            input=prompt,
+            capture_output=True,
+            text=True,
+            timeout=1800,
+        )
+
+        if result.returncode != 0:
+            print(f"\n  WARN: Codex가 비정상 종료됨 (code {result.returncode})")
+            if result.stderr:
+                print(f"  stderr: {result.stderr[:500]}")
+
+        final_message = None
+        if last_message_path.exists():
+            final_message = last_message_path.read_text(encoding="utf-8")
+
+        output = {
+            "step": step_num, "name": step_name,
+            "exitCode": result.returncode,
+            "finalMessage": final_message,
+            "stdout": result.stdout, "stderr": result.stderr,
+        }
+        out_path = self._phase_dir / f"step{step_num}-output.json"
+        with open(out_path, "w", encoding="utf-8") as f:
+            json.dump(output, f, indent=2, ensure_ascii=False)
+
+        return output
+
+    # --- 헤더 & 검증 ---
+
+    def _print_header(self):
+        print(f"\n{'='*60}")
+        print(f"  Harness Step Executor")
+        print(f"  Phase: {self._phase_name} | Steps: {self._total}")
+        if self._auto_push:
+            print(f"  Auto-push: enabled")
+        print(f"{'='*60}")
+
+    def _check_blockers(self):
+        index = self._read_json(self._index_file)
+        for s in reversed(index["steps"]):
+            if s["status"] == "error":
+                print(f"\n  ✗ Step {s['step']} ({s['name']}) failed.")
+                print(f"  Error: {s.get('error_message', 'unknown')}")
+                print(f"  Fix and reset status to 'pending' to retry.")
+                sys.exit(1)
+            if s["status"] == "blocked":
+                print(f"\n  ⏸ Step {s['step']} ({s['name']}) blocked.")
+                print(f"  Reason: {s.get('blocked_reason', 'unknown')}")
+                print(f"  Resolve and reset status to 'pending' to retry.")
+                sys.exit(2)
+            if s["status"] != "pending":
+                break
+
+    def _ensure_created_at(self):
+        index = self._read_json(self._index_file)
+        if "created_at" not in index:
+            index["created_at"] = self._stamp()
+            self._write_json(self._index_file, index)
+
+    # --- 실행 루프 ---
+
+    def _execute_single_step(self, step: dict, guardrails: str) -> bool:
+        """단일 step 실행 (재시도 포함). 완료되면 True, 실패/차단이면 False."""
+        step_num, step_name = step["step"], step["name"]
+        done = sum(1 for s in self._read_json(self._index_file)["steps"] if s["status"] == "completed")
+        prev_error = None
+
+        for attempt in range(1, self.MAX_RETRIES + 1):
+            index = self._read_json(self._index_file)
+            step_context = self._build_step_context(index)
+            preamble = self._build_preamble(guardrails, step_context, prev_error)
+
+            tag = f"Step {step_num}/{self._total - 1} ({done} done): {step_name}"
+            if attempt > 1:
+                tag += f" [retry {attempt}/{self.MAX_RETRIES}]"
+
+            with progress_indicator(tag) as pi:
+                self._invoke_codex(step, preamble)
+                elapsed = int(pi.elapsed)
+
+            index = self._read_json(self._index_file)
+            status = next((s.get("status", "pending") for s in index["steps"] if s["step"] == step_num), "pending")
+            ts = self._stamp()
+
+            if status == "completed":
+                for s in index["steps"]:
+                    if s["step"] == step_num:
+                        s["completed_at"] = ts
+                self._write_json(self._index_file, index)
+                self._commit_step(step_num, step_name)
+                print(f"  ✓ Step {step_num}: {step_name} [{elapsed}s]")
+                return True
+
+            if status == "blocked":
+                for s in index["steps"]:
+                    if s["step"] == step_num:
+                        s["blocked_at"] = ts
+                self._write_json(self._index_file, index)
+                reason = next((s.get("blocked_reason", "") for s in index["steps"] if s["step"] == step_num), "")
+                print(f"  ⏸ Step {step_num}: {step_name} blocked [{elapsed}s]")
+                print(f"    Reason: {reason}")
+                self._update_top_index("blocked")
+                sys.exit(2)
+
+            err_msg = next(
+                (s.get("error_message", "Step did not update status") for s in index["steps"] if s["step"] == step_num),
+                "Step did not update status",
+            )
+
+            if attempt < self.MAX_RETRIES:
+                for s in index["steps"]:
+                    if s["step"] == step_num:
+                        s["status"] = "pending"
+                        s.pop("error_message", None)
+                self._write_json(self._index_file, index)
+                prev_error = err_msg
+                print(f"  ↻ Step {step_num}: retry {attempt}/{self.MAX_RETRIES} — {err_msg}")
+            else:
+                for s in index["steps"]:
+                    if s["step"] == step_num:
+                        s["status"] = "error"
+                        s["error_message"] = f"[{self.MAX_RETRIES}회 시도 후 실패] {err_msg}"
+                        s["failed_at"] = ts
+                self._write_json(self._index_file, index)
+                self._commit_step(step_num, step_name)
+                print(f"  ✗ Step {step_num}: {step_name} failed after {self.MAX_RETRIES} attempts [{elapsed}s]")
+                print(f"    Error: {err_msg}")
+                self._update_top_index("error")
+                sys.exit(1)
+
+        return False  # unreachable
+
+    def _execute_all_steps(self, guardrails: str):
+        while True:
+            index = self._read_json(self._index_file)
+            pending = next((s for s in index["steps"] if s["status"] == "pending"), None)
+            if pending is None:
+                print("\n  All steps completed!")
+                return
+
+            step_num = pending["step"]
+            for s in index["steps"]:
+                if s["step"] == step_num and "started_at" not in s:
+                    s["started_at"] = self._stamp()
+                    self._write_json(self._index_file, index)
+                    break
+
+            self._execute_single_step(pending, guardrails)
+
+    def _finalize(self):
+        index = self._read_json(self._index_file)
+        index["completed_at"] = self._stamp()
+        self._write_json(self._index_file, index)
+        self._update_top_index("completed")
+
+        self._run_git("add", "-A")
+        if self._run_git("diff", "--cached", "--quiet").returncode != 0:
+            msg = f"chore({self._phase_name}): mark phase completed"
+            r = self._run_git("commit", "-m", msg)
+            if r.returncode == 0:
+                print(f"  ✓ {msg}")
+
+        if self._auto_push:
+            branch = f"feat-{self._phase_name}"
+            r = self._run_git("push", "-u", "origin", branch)
+            if r.returncode != 0:
+                print(f"\n  ERROR: git push 실패: {r.stderr.strip()}")
+                sys.exit(1)
+            print(f"  ✓ Pushed to origin/{branch}")
+
+        print(f"\n{'='*60}")
+        print(f"  Phase '{self._phase_name}' completed!")
+        print(f"{'='*60}")
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Harness Step Executor")
+    parser.add_argument("phase_dir", help="Phase directory name (e.g. 0-mvp)")
+    parser.add_argument("--push", action="store_true", help="Push branch after completion")
+    args = parser.parse_args()
+
+    StepExecutor(args.phase_dir, auto_push=args.push).run()
+
+
+if __name__ == "__main__":
+    main()

scripts/test_execute.py

@@ -0,0 +1,562 @@
+"""execute.py Codex migration safety-net tests."""
+
+import json
+import sys
+from datetime import datetime, timedelta
+from pathlib import Path
+from unittest.mock import patch, MagicMock
+
+import pytest
+
+sys.path.insert(0, str(Path(__file__).parent))
+import execute as ex
+
+
+# ---------------------------------------------------------------------------
+# Fixtures
+# ---------------------------------------------------------------------------
+
+@pytest.fixture
+def tmp_project(tmp_path):
+    """phases/, AGENTS.md, docs/ 를 갖춘 임시 프로젝트 구조."""
+    phases_dir = tmp_path / "phases"
+    phases_dir.mkdir()
+
+    agents_md = tmp_path / "AGENTS.md"
+    agents_md.write_text("# Rules\n- rule one\n- rule two")
+
+    docs_dir = tmp_path / "docs"
+    docs_dir.mkdir()
+    (docs_dir / "arch.md").write_text("# Architecture\nSome content")
+    (docs_dir / "guide.md").write_text("# Guide\nAnother doc")
+
+    return tmp_path
+
+
+@pytest.fixture
+def phase_dir(tmp_project):
+    """step 3개를 가진 phase 디렉토리."""
+    d = tmp_project / "phases" / "0-mvp"
+    d.mkdir()
+
+    index = {
+        "project": "TestProject",
+        "phase": "mvp",
+        "steps": [
+            {"step": 0, "name": "setup", "status": "completed", "summary": "프로젝트 초기화 완료"},
+            {"step": 1, "name": "core", "status": "completed", "summary": "핵심 로직 구현"},
+            {"step": 2, "name": "ui", "status": "pending"},
+        ],
+    }
+    (d / "index.json").write_text(json.dumps(index, indent=2, ensure_ascii=False))
+    (d / "step2.md").write_text("# Step 2: UI\n\nUI를 구현하세요.")
+
+    return d
+
+
+@pytest.fixture
+def top_index(tmp_project):
+    """phases/index.json (top-level)."""
+    top = {
+        "phases": [
+            {"dir": "0-mvp", "status": "pending"},
+            {"dir": "1-polish", "status": "pending"},
+        ]
+    }
+    p = tmp_project / "phases" / "index.json"
+    p.write_text(json.dumps(top, indent=2))
+    return p
+
+
+@pytest.fixture
+def executor(tmp_project, phase_dir):
+    """테스트용 StepExecutor 인스턴스. git 호출은 별도 mock 필요."""
+    with patch.object(ex, "ROOT", tmp_project):
+        inst = ex.StepExecutor("0-mvp")
+    # 내부 경로를 tmp_project 기준으로 재설정
+    inst._root = str(tmp_project)
+    inst._phases_dir = tmp_project / "phases"
+    inst._phase_dir = phase_dir
+    inst._phase_dir_name = "0-mvp"
+    inst._index_file = phase_dir / "index.json"
+    inst._top_index_file = tmp_project / "phases" / "index.json"
+    return inst
+
+
+# ---------------------------------------------------------------------------
+# _stamp (= 이전 now_iso)
+# ---------------------------------------------------------------------------
+
+class TestStamp:
+    def test_returns_kst_timestamp(self, executor):
+        result = executor._stamp()
+        assert "+0900" in result
+
+    def test_format_is_iso(self, executor):
+        result = executor._stamp()
+        dt = datetime.strptime(result, "%Y-%m-%dT%H:%M:%S%z")
+        assert dt.tzinfo is not None
+
+    def test_is_current_time(self, executor):
+        before = datetime.now(ex.StepExecutor.TZ).replace(microsecond=0)
+        result = executor._stamp()
+        after = datetime.now(ex.StepExecutor.TZ).replace(microsecond=0) + timedelta(seconds=1)
+        parsed = datetime.strptime(result, "%Y-%m-%dT%H:%M:%S%z")
+        assert before <= parsed <= after
+
+
+# ---------------------------------------------------------------------------
+# _read_json / _write_json
+# ---------------------------------------------------------------------------
+
+class TestJsonHelpers:
+    def test_roundtrip(self, tmp_path):
+        data = {"key": "값", "nested": [1, 2, 3]}
+        p = tmp_path / "test.json"
+        ex.StepExecutor._write_json(p, data)
+        loaded = ex.StepExecutor._read_json(p)
+        assert loaded == data
+
+    def test_save_ensures_ascii_false(self, tmp_path):
+        p = tmp_path / "test.json"
+        ex.StepExecutor._write_json(p, {"한글": "테스트"})
+        raw = p.read_text()
+        assert "한글" in raw
+        assert "\\u" not in raw
+
+    def test_save_indented(self, tmp_path):
+        p = tmp_path / "test.json"
+        ex.StepExecutor._write_json(p, {"a": 1})
+        raw = p.read_text()
+        assert "\n" in raw
+
+    def test_load_nonexistent_raises(self, tmp_path):
+        with pytest.raises(FileNotFoundError):
+            ex.StepExecutor._read_json(tmp_path / "nope.json")
+
+
+# ---------------------------------------------------------------------------
+# _load_guardrails
+# ---------------------------------------------------------------------------
+
+class TestLoadGuardrails:
+    def test_loads_agents_md_and_docs(self, executor, tmp_project):
+        with patch.object(ex, "ROOT", tmp_project):
+            result = executor._load_guardrails()
+        assert "# Rules" in result
+        assert "rule one" in result
+        assert "# Architecture" in result
+        assert "# Guide" in result
+
+    def test_sections_separated_by_divider(self, executor, tmp_project):
+        with patch.object(ex, "ROOT", tmp_project):
+            result = executor._load_guardrails()
+        assert "---" in result
+
+    def test_docs_sorted_alphabetically(self, executor, tmp_project):
+        with patch.object(ex, "ROOT", tmp_project):
+            result = executor._load_guardrails()
+        arch_pos = result.index("arch")
+        guide_pos = result.index("guide")
+        assert arch_pos < guide_pos
+
+    def test_no_agents_md(self, executor, tmp_project):
+        (tmp_project / "AGENTS.md").unlink()
+        with patch.object(ex, "ROOT", tmp_project):
+            result = executor._load_guardrails()
+        assert "AGENTS.md" not in result
+        assert "Architecture" in result
+
+    def test_no_docs_dir(self, executor, tmp_project):
+        import shutil
+        shutil.rmtree(tmp_project / "docs")
+        with patch.object(ex, "ROOT", tmp_project):
+            result = executor._load_guardrails()
+        assert "Rules" in result
+        assert "Architecture" not in result
+
+    def test_empty_project(self, tmp_path):
+        with patch.object(ex, "ROOT", tmp_path):
+            # executor가 필요 없는 static-like 동작이므로 임시 인스턴스
+            phases_dir = tmp_path / "phases" / "dummy"
+            phases_dir.mkdir(parents=True)
+            idx = {"project": "T", "phase": "t", "steps": []}
+            (phases_dir / "index.json").write_text(json.dumps(idx))
+            inst = ex.StepExecutor.__new__(ex.StepExecutor)
+            result = inst._load_guardrails()
+        assert result == ""
+
+
+# ---------------------------------------------------------------------------
+# _build_step_context
+# ---------------------------------------------------------------------------
+
+class TestBuildStepContext:
+    def test_includes_completed_with_summary(self, phase_dir):
+        index = json.loads((phase_dir / "index.json").read_text())
+        result = ex.StepExecutor._build_step_context(index)
+        assert "Step 0 (setup): 프로젝트 초기화 완료" in result
+        assert "Step 1 (core): 핵심 로직 구현" in result
+
+    def test_excludes_pending(self, phase_dir):
+        index = json.loads((phase_dir / "index.json").read_text())
+        result = ex.StepExecutor._build_step_context(index)
+        assert "ui" not in result
+
+    def test_excludes_completed_without_summary(self, phase_dir):
+        index = json.loads((phase_dir / "index.json").read_text())
+        del index["steps"][0]["summary"]
+        result = ex.StepExecutor._build_step_context(index)
+        assert "setup" not in result
+        assert "core" in result
+
+    def test_empty_when_no_completed(self):
+        index = {"steps": [{"step": 0, "name": "a", "status": "pending"}]}
+        result = ex.StepExecutor._build_step_context(index)
+        assert result == ""
+
+    def test_has_header(self, phase_dir):
+        index = json.loads((phase_dir / "index.json").read_text())
+        result = ex.StepExecutor._build_step_context(index)
+        assert result.startswith("## 이전 Step 산출물")
+
+
+# ---------------------------------------------------------------------------
+# _build_preamble
+# ---------------------------------------------------------------------------
+
+class TestBuildPreamble:
+    def test_includes_project_name(self, executor):
+        result = executor._build_preamble("", "")
+        assert "TestProject" in result
+
+    def test_includes_guardrails(self, executor):
+        result = executor._build_preamble("GUARD_CONTENT", "")
+        assert "GUARD_CONTENT" in result
+
+    def test_includes_step_context(self, executor):
+        ctx = "## 이전 Step 산출물\n\n- Step 0: done"
+        result = executor._build_preamble("", ctx)
+        assert "이전 Step 산출물" in result
+
+    def test_mentions_executor_commits(self, executor):
+        result = executor._build_preamble("", "")
+        assert "커밋은 execute.py가 정리한다" in result
+
+    def test_includes_rules(self, executor):
+        result = executor._build_preamble("", "")
+        assert "작업 규칙" in result
+        assert "AC" in result
+
+    def test_no_retry_section_by_default(self, executor):
+        result = executor._build_preamble("", "")
+        assert "이전 시도 실패" not in result
+
+    def test_retry_section_with_prev_error(self, executor):
+        result = executor._build_preamble("", "", prev_error="타입 에러 발생")
+        assert "이전 시도 실패" in result
+        assert "타입 에러 발생" in result
+
+    def test_includes_max_retries(self, executor):
+        result = executor._build_preamble("", "")
+        assert str(ex.StepExecutor.MAX_RETRIES) in result
+
+    def test_includes_index_path(self, executor):
+        result = executor._build_preamble("", "")
+        assert "/phases/0-mvp/index.json" in result
+
+
+# ---------------------------------------------------------------------------
+# _update_top_index
+# ---------------------------------------------------------------------------
+
+class TestUpdateTopIndex:
+    def test_completed(self, executor, top_index):
+        executor._top_index_file = top_index
+        executor._update_top_index("completed")
+        data = json.loads(top_index.read_text())
+        mvp = next(p for p in data["phases"] if p["dir"] == "0-mvp")
+        assert mvp["status"] == "completed"
+        assert "completed_at" in mvp
+
+    def test_error(self, executor, top_index):
+        executor._top_index_file = top_index
+        executor._update_top_index("error")
+        data = json.loads(top_index.read_text())
+        mvp = next(p for p in data["phases"] if p["dir"] == "0-mvp")
+        assert mvp["status"] == "error"
+        assert "failed_at" in mvp
+
+    def test_blocked(self, executor, top_index):
+        executor._top_index_file = top_index
+        executor._update_top_index("blocked")
+        data = json.loads(top_index.read_text())
+        mvp = next(p for p in data["phases"] if p["dir"] == "0-mvp")
+        assert mvp["status"] == "blocked"
+        assert "blocked_at" in mvp
+
+    def test_other_phases_unchanged(self, executor, top_index):
+        executor._top_index_file = top_index
+        executor._update_top_index("completed")
+        data = json.loads(top_index.read_text())
+        polish = next(p for p in data["phases"] if p["dir"] == "1-polish")
+        assert polish["status"] == "pending"
+
+    def test_nonexistent_dir_is_noop(self, executor, top_index):
+        executor._top_index_file = top_index
+        executor._phase_dir_name = "no-such-dir"
+        original = json.loads(top_index.read_text())
+        executor._update_top_index("completed")
+        after = json.loads(top_index.read_text())
+        for p_before, p_after in zip(original["phases"], after["phases"]):
+            assert p_before["status"] == p_after["status"]
+
+    def test_no_top_index_file(self, executor, tmp_path):
+        executor._top_index_file = tmp_path / "nonexistent.json"
+        executor._update_top_index("completed")  # should not raise
+
+
+# ---------------------------------------------------------------------------
+# _checkout_branch (mocked)
+# ---------------------------------------------------------------------------
+
+class TestCheckoutBranch:
+    def _mock_git(self, executor, responses):
+        call_idx = {"i": 0}
+        def fake_git(*args):
+            idx = call_idx["i"]
+            call_idx["i"] += 1
+            if idx < len(responses):
+                return responses[idx]
+            return MagicMock(returncode=0, stdout="", stderr="")
+        executor._run_git = fake_git
+
+    def test_already_on_branch(self, executor):
+        self._mock_git(executor, [
+            MagicMock(returncode=0, stdout="feat-mvp\n", stderr=""),
+        ])
+        executor._checkout_branch()  # should return without checkout
+
+    def test_branch_exists_checkout(self, executor):
+        self._mock_git(executor, [
+            MagicMock(returncode=0, stdout="main\n", stderr=""),
+            MagicMock(returncode=0, stdout="", stderr=""),
+            MagicMock(returncode=0, stdout="", stderr=""),
+        ])
+        executor._checkout_branch()
+
+    def test_branch_not_exists_create(self, executor):
+        self._mock_git(executor, [
+            MagicMock(returncode=0, stdout="main\n", stderr=""),
+            MagicMock(returncode=1, stdout="", stderr="not found"),
+            MagicMock(returncode=0, stdout="", stderr=""),
+        ])
+        executor._checkout_branch()
+
+    def test_checkout_fails_exits(self, executor):
+        self._mock_git(executor, [
+            MagicMock(returncode=0, stdout="main\n", stderr=""),
+            MagicMock(returncode=1, stdout="", stderr=""),
+            MagicMock(returncode=1, stdout="", stderr="dirty tree"),
+        ])
+        with pytest.raises(SystemExit) as exc_info:
+            executor._checkout_branch()
+        assert exc_info.value.code == 1
+
+    def test_no_git_exits(self, executor):
+        self._mock_git(executor, [
+            MagicMock(returncode=1, stdout="", stderr="not a git repo"),
+        ])
+        with pytest.raises(SystemExit) as exc_info:
+            executor._checkout_branch()
+        assert exc_info.value.code == 1
+
+
+# ---------------------------------------------------------------------------
+# _commit_step (mocked)
+# ---------------------------------------------------------------------------
+
+class TestCommitStep:
+    def test_two_phase_commit(self, executor):
+        calls = []
+        def fake_git(*args):
+            calls.append(args)
+            if args[:2] == ("diff", "--cached"):
+                return MagicMock(returncode=1)
+            return MagicMock(returncode=0, stdout="", stderr="")
+        executor._run_git = fake_git
+
+        executor._commit_step(2, "ui")
+
+        commit_calls = [c for c in calls if c[0] == "commit"]
+        assert len(commit_calls) == 2
+        assert "feat(mvp):" in commit_calls[0][2]
+        assert "chore(mvp):" in commit_calls[1][2]
+
+    def test_no_code_changes_skips_feat_commit(self, executor):
+        call_count = {"diff": 0}
+        calls = []
+        def fake_git(*args):
+            calls.append(args)
+            if args[:2] == ("diff", "--cached"):
+                call_count["diff"] += 1
+                if call_count["diff"] == 1:
+                    return MagicMock(returncode=0)
+                return MagicMock(returncode=1)
+            return MagicMock(returncode=0, stdout="", stderr="")
+        executor._run_git = fake_git
+
+        executor._commit_step(2, "ui")
+
+        commit_msgs = [c[2] for c in calls if c[0] == "commit"]
+        assert len(commit_msgs) == 1
+        assert "chore" in commit_msgs[0]
+
+
+# ---------------------------------------------------------------------------
+# _invoke_codex (mocked)
+# ---------------------------------------------------------------------------
+
+class TestInvokeCodex:
+    def test_invokes_codex_with_correct_args(self, executor):
+        mock_result = MagicMock(returncode=0, stdout='{"result": "ok"}', stderr="")
+        step = {"step": 2, "name": "ui"}
+        preamble = "PREAMBLE\n"
+
+        with patch("subprocess.run", return_value=mock_result) as mock_run:
+            output = executor._invoke_codex(step, preamble)
+
+        cmd = mock_run.call_args[0][0]
+        kwargs = mock_run.call_args[1]
+        assert cmd[0] == "codex"
+        assert cmd[1] == "exec"
+        assert "--full-auto" in cmd
+        assert "--json" in cmd
+        assert "-o" in cmd
+        assert "PREAMBLE" in kwargs["input"]
+        assert "UI를 구현하세요" in kwargs["input"]
+        assert output["finalMessage"] is None
+
+    def test_saves_output_json(self, executor):
+        def fake_run(*args, **kwargs):
+            cmd = args[0]
+            last_message_path = Path(cmd[cmd.index("-o") + 1])
+            last_message_path.write_text("completed", encoding="utf-8")
+            return MagicMock(returncode=0, stdout='{"ok": true}', stderr="")
+
+        step = {"step": 2, "name": "ui"}
+
+        with patch("subprocess.run", side_effect=fake_run):
+            executor._invoke_codex(step, "preamble")
+
+        output_file = executor._phase_dir / "step2-output.json"
+        assert output_file.exists()
+        data = json.loads(output_file.read_text())
+        assert data["step"] == 2
+        assert data["name"] == "ui"
+        assert data["exitCode"] == 0
+        assert data["finalMessage"] == "completed"
+
+    def test_nonexistent_step_file_exits(self, executor):
+        step = {"step": 99, "name": "nonexistent"}
+        with pytest.raises(SystemExit) as exc_info:
+            executor._invoke_codex(step, "preamble")
+        assert exc_info.value.code == 1
+
+    def test_timeout_is_1800(self, executor):
+        mock_result = MagicMock(returncode=0, stdout="{}", stderr="")
+        step = {"step": 2, "name": "ui"}
+
+        with patch("subprocess.run", return_value=mock_result) as mock_run:
+            executor._invoke_codex(step, "preamble")
+
+        assert mock_run.call_args[1]["timeout"] == 1800
+
+
+# ---------------------------------------------------------------------------
+# progress_indicator (= 이전 Spinner)
+# ---------------------------------------------------------------------------
+
+class TestProgressIndicator:
+    def test_context_manager(self):
+        import time
+        with ex.progress_indicator("test") as pi:
+            time.sleep(0.15)
+        assert pi.elapsed >= 0.1
+
+    def test_elapsed_increases(self):
+        import time
+        with ex.progress_indicator("test") as pi:
+            time.sleep(0.2)
+        assert pi.elapsed > 0
+
+
+# ---------------------------------------------------------------------------
+# main() CLI 파싱 (mocked)
+# ---------------------------------------------------------------------------
+
+class TestMainCli:
+    def test_no_args_exits(self):
+        with patch("sys.argv", ["execute.py"]):
+            with pytest.raises(SystemExit) as exc_info:
+                ex.main()
+            assert exc_info.value.code == 2  # argparse exits with 2
+
+    def test_invalid_phase_dir_exits(self):
+        with patch("sys.argv", ["execute.py", "nonexistent"]):
+            with patch.object(ex, "ROOT", Path("/tmp/fake_nonexistent")):
+                with pytest.raises(SystemExit) as exc_info:
+                    ex.main()
+                assert exc_info.value.code == 1
+
+    def test_missing_index_exits(self, tmp_project):
+        (tmp_project / "phases" / "empty").mkdir()
+        with patch("sys.argv", ["execute.py", "empty"]):
+            with patch.object(ex, "ROOT", tmp_project):
+                with pytest.raises(SystemExit) as exc_info:
+                    ex.main()
+                assert exc_info.value.code == 1
+
+
+# ---------------------------------------------------------------------------
+# _check_blockers (= 이전 main() error/blocked 체크)
+# ---------------------------------------------------------------------------
+
+class TestCheckBlockers:
+    def _make_executor_with_steps(self, tmp_project, steps):
+        d = tmp_project / "phases" / "test-phase"
+        d.mkdir(exist_ok=True)
+        index = {"project": "T", "phase": "test", "steps": steps}
+        (d / "index.json").write_text(json.dumps(index))
+
+        with patch.object(ex, "ROOT", tmp_project):
+            inst = ex.StepExecutor.__new__(ex.StepExecutor)
+        inst._root = str(tmp_project)
+        inst._phases_dir = tmp_project / "phases"
+        inst._phase_dir = d
+        inst._phase_dir_name = "test-phase"
+        inst._index_file = d / "index.json"
+        inst._top_index_file = tmp_project / "phases" / "index.json"
+        inst._phase_name = "test"
+        inst._total = len(steps)
+        return inst
+
+    def test_error_step_exits_1(self, tmp_project):
+        steps = [
+            {"step": 0, "name": "ok", "status": "completed"},
+            {"step": 1, "name": "bad", "status": "error", "error_message": "fail"},
+        ]
+        inst = self._make_executor_with_steps(tmp_project, steps)
+        with pytest.raises(SystemExit) as exc_info:
+            inst._check_blockers()
+        assert exc_info.value.code == 1
+
+    def test_blocked_step_exits_2(self, tmp_project):
+        steps = [
+            {"step": 0, "name": "ok", "status": "completed"},
+            {"step": 1, "name": "stuck", "status": "blocked", "blocked_reason": "API key"},
+        ]
+        inst = self._make_executor_with_steps(tmp_project, steps)
+        with pytest.raises(SystemExit) as exc_info:
+            inst._check_blockers()
+        assert exc_info.value.code == 2

scripts/validate_workspace.py

@@ -0,0 +1,91 @@
+#!/usr/bin/env python3
+"""Run repository validation commands for the Harness template."""
+
+from __future__ import annotations
+
+import json
+import os
+import subprocess
+import sys
+from pathlib import Path
+
+
+DEFAULT_NPM_ORDER = ("lint", "build", "test")
+
+
+def load_env_commands() -> list[str]:
+    raw = os.environ.get("HARNESS_VALIDATION_COMMANDS", "")
+    return [line.strip() for line in raw.splitlines() if line.strip()]
+
+
+def load_npm_commands(root: Path) -> list[str]:
+    package_json = root / "package.json"
+    if not package_json.exists():
+        return []
+
+    try:
+        payload = json.loads(package_json.read_text(encoding="utf-8"))
+    except json.JSONDecodeError:
+        return []
+
+    scripts = payload.get("scripts", {})
+    if not isinstance(scripts, dict):
+        return []
+
+    commands = []
+    for name in DEFAULT_NPM_ORDER:
+        value = scripts.get(name)
+        if isinstance(value, str) and value.strip():
+            commands.append(f"npm run {name}")
+    return commands
+
+
+def discover_commands(root: Path) -> list[str]:
+    env_commands = load_env_commands()
+    if env_commands:
+        return env_commands
+    return load_npm_commands(root)
+
+
+def run_command(command: str, root: Path) -> subprocess.CompletedProcess:
+    return subprocess.run(
+        command,
+        cwd=root,
+        shell=True,
+        capture_output=True,
+        text=True,
+    )
+
+
+def emit_stream(prefix: str, content: str, *, stream) -> None:
+    text = content.strip()
+    if not text:
+        return
+    print(prefix, file=stream)
+    print(text, file=stream)
+
+
+def main() -> int:
+    root = Path(__file__).resolve().parent.parent
+    commands = discover_commands(root)
+
+    if not commands:
+        print("No validation commands configured.")
+        print("Set HARNESS_VALIDATION_COMMANDS or add npm scripts for lint/build/test.")
+        return 0
+
+    for command in commands:
+        print(f"$ {command}")
+        result = run_command(command, root)
+        emit_stream("[stdout]", result.stdout, stream=sys.stdout)
+        emit_stream("[stderr]", result.stderr, stream=sys.stderr)
+        if result.returncode != 0:
+            print(f"Validation failed: {command}", file=sys.stderr)
+            return result.returncode
+
+    print("Validation succeeded.")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())