kin: auto-commit after pipeline

agents/prompts/architect.md

@@ -15,6 +15,7 @@ You receive:
 
 **Normal mode** (default):
 
+0. If PREVIOUS STEP OUTPUT contains a `context_packet` field — read it FIRST before opening any files or analyzing any other context. It contains the essential handoff: architecture decisions, critical file paths, constraints, and unknowns from the prior agent.
 1. Read `DESIGN.md`, `core/models.py`, `core/db.py`, `agents/runner.py`, and any MODULES files relevant to the task
 2. Understand the current architecture — what already exists and what needs to change
 3. Design the solution: data model, interfaces, component interactions

agents/prompts/backend_dev.md

@@ -12,6 +12,7 @@ You receive:
 
 ## Working Mode
 
+0. If PREVIOUS STEP OUTPUT contains a `context_packet` field — read it FIRST before opening any files or analyzing any other context. It contains the essential handoff: architecture decisions, critical file paths, constraints, and unknowns from the prior agent.
 1. Read all relevant backend files before making any changes
 2. Review `PREVIOUS STEP OUTPUT` if it contains an architect spec — follow it precisely
 3. Implement the feature or fix as described in the task brief

agents/prompts/department_head.md

@@ -28,6 +28,7 @@ You receive:
 - Handoff notes clarity — the next department must be able to start without asking questions
 - Previous department handoff — build on their work, don't repeat it
 - Sub-pipeline length — keep it SHORT, 1-4 steps maximum
+- Produce a `context_packet` with exactly 5 fields: `architecture_notes` (string — key arch decisions made), `key_files` (array of file paths critical for the next agent), `constraints` (array of hard technical/business limits discovered), `unknowns` (array of open risks or unresolved questions), `handoff_for` (string — role name of the first worker in sub_pipeline). In the brief for the FIRST worker in sub_pipeline, include this sentence verbatim: «IMPORTANT: Read the `context_packet` field in PREVIOUS STEP OUTPUT FIRST, before any other section or file.»
 
 **Department-specific guidance:**
 
@@ -46,6 +47,7 @@ You receive:
 - Each worker brief is self-contained — no "see above" references
 - Artifacts list is complete and specific
 - Handoff notes are actionable for the next department
+- `context_packet` is present with all 5 required fields; `handoff_for` is non-empty and matches the role in `sub_pipeline[0]`; first worker brief contains explicit instruction to read `context_packet` first
 
 ## Return Format
 
@@ -72,7 +74,14 @@ Return ONLY valid JSON (no markdown, no explanation):
     "schemas": [],
     "notes": "Added feature with full test coverage. All tests pass."
   },
-  "handoff_notes": "Backend implementation complete. Tests passing. Frontend needs to call POST /api/feature with {field: value} body."
+  "handoff_notes": "Backend implementation complete. Tests passing. Frontend needs to call POST /api/feature with {field: value} body.",
+  "context_packet": {
+    "architecture_notes": "Used existing models.py pattern, no ORM, raw sqlite3",
+    "key_files": ["core/models.py", "web/api.py"],
+    "constraints": ["All DB columns must have DEFAULT values", "No new Python deps"],
+    "unknowns": ["Frontend integration not yet verified"],
+    "handoff_for": "backend_dev"
+  }
 }
 ```
 

agents/prompts/frontend_dev.md

@@ -12,6 +12,7 @@ You receive:
 
 ## Working Mode
 
+0. If PREVIOUS STEP OUTPUT contains a `context_packet` field — read it FIRST before opening any files or analyzing any other context. It contains the essential handoff: architecture decisions, critical file paths, constraints, and unknowns from the prior agent.
 1. Read all relevant frontend files before making any changes
 2. Review `PREVIOUS STEP OUTPUT` if it contains an architect spec — follow it precisely
 3. Implement the feature or fix as described in the task brief

agents/runner.py

@@ -1347,14 +1347,29 @@ def _execute_department_head_step(
     role = step["role"]
     dept_name = role.replace("_head", "")
 
-    # Build initial context for workers: dept head's plan + artifacts
+    # Extract context_packet (KIN-DOCS-004): fail-open if missing
-    dept_plan_context = json.dumps({
+    context_packet = parsed.get("context_packet")
-        "department_head_plan": {
+    if context_packet is None and parent_pipeline_id:
+        try:
+            models.write_log(
+                conn, parent_pipeline_id,
+                f"Dept {step['role']}: context_packet missing from output — handoff quality degraded",
+                level="WARN",
+                extra={"role": step["role"]},
+            )
+        except Exception:
+            pass
+
+    # Build initial context for workers: context_packet first, then dept head's plan
+    dept_plan_context_dict: dict = {}
+    if context_packet is not None:
+        dept_plan_context_dict["context_packet"] = context_packet
+    dept_plan_context_dict["department_head_plan"] = {
         "department": dept_name,
         "artifacts": parsed.get("artifacts", {}),
         "handoff_notes": parsed.get("handoff_notes", ""),
-        },
+    }
-    }, ensure_ascii=False)
+    dept_plan_context = json.dumps(dept_plan_context_dict, ensure_ascii=False)
 
     # KIN-084: log sub-pipeline start
     if parent_pipeline_id:
@@ -1429,6 +1444,7 @@ def _execute_department_head_step(
             decisions_made=decisions_made,
             blockers=[],
             status=handoff_status,
+            context_packet=context_packet,
         )
     except Exception:
         pass  # Handoff save errors must never block pipeline
@@ -1438,6 +1454,7 @@ def _execute_department_head_step(
         "from_department": dept_name,
         "handoff_notes": parsed.get("handoff_notes", ""),
         "artifacts": parsed.get("artifacts", {}),
+        "context_packet": context_packet,
         "sub_pipeline_summary": {
             "steps_completed": sub_result.get("steps_completed", 0),
             "success": sub_result.get("success", False),

agents/specialists.yaml

@@ -181,6 +181,8 @@ specialists:
     context_rules:
       decisions: all
       modules: all
+    output_schema:
+      context_packet: "{ architecture_notes: string, key_files: array, constraints: array, unknowns: array, handoff_for: string }"
 
   frontend_head:
     name: "Frontend Department Head"
@@ -193,6 +195,8 @@ specialists:
     context_rules:
       decisions: all
       modules: all
+    output_schema:
+      context_packet: "{ architecture_notes: string, key_files: array, constraints: array, unknowns: array, handoff_for: string }"
 
   qa_head:
     name: "QA Department Head"
@@ -204,6 +208,8 @@ specialists:
     permissions: read_only
     context_rules:
       decisions: all
+    output_schema:
+      context_packet: "{ architecture_notes: string, key_files: array, constraints: array, unknowns: array, handoff_for: string }"
 
   security_head:
     name: "Security Department Head"
@@ -215,6 +221,8 @@ specialists:
     permissions: read_only
     context_rules:
       decisions_category: security
+    output_schema:
+      context_packet: "{ architecture_notes: string, key_files: array, constraints: array, unknowns: array, handoff_for: string }"
 
   infra_head:
     name: "Infrastructure Department Head"
@@ -226,6 +234,8 @@ specialists:
     permissions: read_only
     context_rules:
       decisions: all
+    output_schema:
+      context_packet: "{ architecture_notes: string, key_files: array, constraints: array, unknowns: array, handoff_for: string }"
 
   knowledge_synthesizer:
     name: "Knowledge Synthesizer"
@@ -252,6 +262,8 @@ specialists:
     permissions: read_only
     context_rules:
       decisions: all
+    output_schema:
+      context_packet: "{ architecture_notes: string, key_files: array, constraints: array, unknowns: array, handoff_for: string }"
 
   marketing_head:
     name: "Marketing Department Head"
@@ -264,6 +276,8 @@ specialists:
     context_rules:
       decisions: all
       modules: all
+    output_schema:
+      context_packet: "{ architecture_notes: string, key_files: array, constraints: array, unknowns: array, handoff_for: string }"
 
 # Departments — PM uses these when routing complex cross-domain tasks to department heads
 departments:

core/db.py

@@ -165,6 +165,7 @@ CREATE TABLE IF NOT EXISTS department_handoffs (
     artifacts JSON,
     decisions_made JSON,
     blockers JSON,
+    context_packet JSON DEFAULT NULL,
     status TEXT DEFAULT 'pending',
     created_at DATETIME DEFAULT CURRENT_TIMESTAMP
 );
@@ -703,6 +704,13 @@ def _migrate(conn: sqlite3.Connection):
         """)
         conn.commit()
 
+    # Add context_packet column to department_handoffs (KIN-DOCS-004)
+    if "department_handoffs" in existing_tables:
+        handoff_cols = {r[1] for r in conn.execute("PRAGMA table_info(department_handoffs)").fetchall()}
+        if "context_packet" not in handoff_cols:
+            conn.execute("ALTER TABLE department_handoffs ADD COLUMN context_packet JSON DEFAULT NULL")
+            conn.commit()
+
     # Add test_command column to projects (KIN-ARCH-008); NULL = auto-detect (KIN-101)
     projects_cols = {row["name"] for row in conn.execute("PRAGMA table_info(projects)")}
     if "test_command" not in projects_cols:

core/models.py

@@ -42,6 +42,7 @@ _JSON_COLUMNS: frozenset[str] = frozenset({
     "dependencies",
     "steps",
     "artifacts", "decisions_made", "blockers",
+    "context_packet",
     "extra_json",
     "pending_actions",
 })
@@ -1191,14 +1192,16 @@ def create_handoff(
     decisions_made: list | None = None,
     blockers: list | None = None,
     status: str = "pending",
+    context_packet: dict | list | None = None,
 ) -> dict:
     """Record a department handoff with artifacts for inter-department context."""
     cur = conn.execute(
         """INSERT INTO department_handoffs
-           (pipeline_id, task_id, from_department, to_department, artifacts, decisions_made, blockers, status)
+           (pipeline_id, task_id, from_department, to_department, artifacts, decisions_made, blockers, context_packet, status)
-           VALUES (?, ?, ?, ?, ?, ?, ?, ?)""",
+           VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)""",
         (pipeline_id, task_id, from_department, to_department,
-         _json_encode(artifacts), _json_encode(decisions_made), _json_encode(blockers), status),
+         _json_encode(artifacts), _json_encode(decisions_made), _json_encode(blockers),
+         _json_encode(context_packet), status),
     )
     conn.commit()
     row = conn.execute(

tests/test_kin_docs_004_regression.py

@@ -0,0 +1,469 @@
+"""Regression tests for KIN-DOCS-004 — context_packet как артефакт handoff.
+
+Acceptance criteria:
+1. Структурный тест agents/prompts/department_head.md: context_packet присутствует
+   в ## Return Format с 5 обязательными полями, упомянут в ## Focus On и ## Quality Checks.
+2. Структурный тест agents/specialists.yaml: все 7 dept head ролей имеют
+   output_schema.context_packet.
+3. Структурные тесты промптов-получателей (architect.md, backend_dev.md, frontend_dev.md):
+   явная инструкция читать context_packet первым (шаг 0 в ## Working Mode).
+4. Unit-тест models.create_handoff: context_packet сохраняется как JSON и декодируется обратно.
+5. Runner-тесты _execute_department_head_step: context_packet включён в summary output,
+   размещён первым ключом в initial context для воркеров; fail-open при отсутствии.
+"""
+
+import json
+from pathlib import Path
+from unittest.mock import patch, MagicMock, call
+
+import pytest
+import yaml
+
+from core.db import init_db
+from core import models
+
+PROMPTS_DIR = Path(__file__).parent.parent / "agents" / "prompts"
+SPECIALISTS_YAML = Path(__file__).parent.parent / "agents" / "specialists.yaml"
+
+DEPT_HEAD_ROLES = [
+    "backend_head",
+    "frontend_head",
+    "qa_head",
+    "security_head",
+    "infra_head",
+    "research_head",
+    "marketing_head",
+]
+
+CONTEXT_PACKET_FIELDS = [
+    "architecture_notes",
+    "key_files",
+    "constraints",
+    "unknowns",
+    "handoff_for",
+]
+
+
+def _load_yaml():
+    return yaml.safe_load(SPECIALISTS_YAML.read_text(encoding="utf-8"))
+
+
+# ---------------------------------------------------------------------------
+# Fixtures
+# ---------------------------------------------------------------------------
+
+@pytest.fixture
+def conn():
+    c = init_db(":memory:")
+    models.create_project(c, "proj", "TestProject", "~/projects/test",
+                          tech_stack=["python"])
+    models.create_task(c, "PROJ-001", "proj", "Test task",
+                       brief={"route_type": "dept_feature"})
+    yield c
+    c.close()
+
+
+def _success_sub_result(pipeline_id=99):
+    return {
+        "success": True,
+        "total_cost_usd": 0.01,
+        "total_tokens": 100,
+        "total_duration_seconds": 2.0,
+        "steps_completed": 1,
+        "results": [{"role": "backend_dev", "output": "done"}],
+        "pipeline_id": pipeline_id,
+    }
+
+
+def _dept_head_raw_output(with_context_packet=True, extra_fields=None):
+    """Сборка raw_output для dept head, опционально с context_packet."""
+    out = {
+        "status": "done",
+        "sub_pipeline": [
+            {"role": "backend_dev", "model": "sonnet", "brief": "Implement feature"},
+        ],
+        "artifacts": {"files_changed": ["core/models.py"], "notes": "done"},
+        "handoff_notes": "Backend complete",
+    }
+    if with_context_packet:
+        out["context_packet"] = {
+            "architecture_notes": "Pure functions, raw sqlite3",
+            "key_files": ["core/models.py", "core/db.py"],
+            "constraints": ["All DB columns need DEFAULT values"],
+            "unknowns": ["Frontend integration pending"],
+            "handoff_for": "backend_dev",
+        }
+    if extra_fields:
+        out.update(extra_fields)
+    return {"raw_output": json.dumps(out)}
+
+
+# ===========================================================================
+# 1. Структурные тесты agents/prompts/department_head.md
+# ===========================================================================
+
+class TestDepartmentHeadPromptStructure:
+    """department_head.md содержит context_packet во всех нужных секциях."""
+
+    def _content(self):
+        return (PROMPTS_DIR / "department_head.md").read_text(encoding="utf-8")
+
+    def test_context_packet_in_return_format(self):
+        """department_head.md содержит 'context_packet' в секции ## Return Format."""
+        content = self._content()
+        # Найти секцию Return Format и убедиться, что context_packet там есть
+        return_format_idx = content.find("## Return Format")
+        assert return_format_idx != -1, "department_head.md не содержит секцию '## Return Format'"
+        return_format_section = content[return_format_idx:]
+        assert "context_packet" in return_format_section, (
+            "department_head.md не содержит 'context_packet' в ## Return Format"
+        )
+
+    @pytest.mark.parametrize("field", CONTEXT_PACKET_FIELDS)
+    def test_context_packet_required_field_present(self, field):
+        """department_head.md упоминает каждое из 5 обязательных полей context_packet."""
+        content = self._content()
+        assert field in content, (
+            f"department_head.md не содержит обязательного поля context_packet: {field!r}"
+        )
+
+    def test_context_packet_in_focus_on(self):
+        """department_head.md упоминает context_packet в секции ## Focus On."""
+        content = self._content()
+        focus_on_idx = content.find("## Focus On")
+        assert focus_on_idx != -1, "department_head.md не содержит секцию '## Focus On'"
+        focus_on_section = content[focus_on_idx:]
+        quality_checks_idx = focus_on_section.find("## Quality Checks")
+        focus_on_body = focus_on_section[:quality_checks_idx] if quality_checks_idx != -1 else focus_on_section
+        assert "context_packet" in focus_on_body, (
+            "department_head.md не упоминает 'context_packet' в ## Focus On"
+        )
+
+    def test_context_packet_in_quality_checks(self):
+        """department_head.md валидирует context_packet в ## Quality Checks."""
+        content = self._content()
+        qc_idx = content.find("## Quality Checks")
+        assert qc_idx != -1, "department_head.md не содержит секцию '## Quality Checks'"
+        qc_section = content[qc_idx:]
+        assert "context_packet" in qc_section, (
+            "department_head.md не упоминает 'context_packet' в ## Quality Checks"
+        )
+
+
+# ===========================================================================
+# 2. Структурный тест agents/specialists.yaml — 7 dept head ролей
+# ===========================================================================
+
+class TestSpecialistsYamlContextPacket:
+    """Все 7 dept head ролей имеют output_schema.context_packet в specialists.yaml."""
+
+    @pytest.mark.parametrize("role", DEPT_HEAD_ROLES)
+    def test_dept_head_has_output_schema_context_packet(self, role):
+        """specialists.yaml: роль {role} имеет output_schema.context_packet."""
+        data = _load_yaml()
+        specialists = data.get("specialists", {})
+        assert role in specialists, (
+            f"Роль {role!r} не найдена в specialists.yaml"
+        )
+        output_schema = specialists[role].get("output_schema", {})
+        assert "context_packet" in output_schema, (
+            f"specialists.yaml: {role} не имеет output_schema.context_packet"
+        )
+
+    def test_exactly_7_dept_heads_have_context_packet(self):
+        """Ровно 7 dept head ролей имеют output_schema.context_packet."""
+        data = _load_yaml()
+        specialists = data.get("specialists", {})
+        roles_with_cp = [
+            role for role, spec in specialists.items()
+            if "context_packet" in spec.get("output_schema", {})
+        ]
+        assert len(roles_with_cp) == 7, (
+            f"Ожидалось 7 ролей с output_schema.context_packet, найдено {len(roles_with_cp)}: {roles_with_cp}"
+        )
+
+
+# ===========================================================================
+# 3. Структурные тесты промптов-получателей context_packet
+# ===========================================================================
+
+class TestWorkerPromptsContextPacketInstruction:
+    """architect.md, backend_dev.md, frontend_dev.md содержат инструкцию читать context_packet первым."""
+
+    @pytest.mark.parametrize("prompt_file", ["architect.md", "backend_dev.md", "frontend_dev.md"])
+    def test_worker_prompt_has_context_packet_read_first_instruction(self, prompt_file):
+        """Промпт {prompt_file} содержит явную инструкцию читать context_packet первым."""
+        content = (PROMPTS_DIR / prompt_file).read_text(encoding="utf-8")
+        assert "context_packet" in content, (
+            f"{prompt_file} не содержит инструкцию про context_packet"
+        )
+
+    @pytest.mark.parametrize("prompt_file", ["architect.md", "backend_dev.md", "frontend_dev.md"])
+    def test_worker_prompt_context_packet_instruction_in_working_mode(self, prompt_file):
+        """Инструкция про context_packet находится в секции ## Working Mode промпта."""
+        content = (PROMPTS_DIR / prompt_file).read_text(encoding="utf-8")
+        wm_idx = content.find("## Working Mode")
+        assert wm_idx != -1, f"{prompt_file} не содержит секцию '## Working Mode'"
+        wm_section = content[wm_idx:]
+        # Ограничиваем до следующей секции
+        next_section_idx = wm_section.find("\n## ", 1)
+        wm_body = wm_section[:next_section_idx] if next_section_idx != -1 else wm_section
+        assert "context_packet" in wm_body, (
+            f"{prompt_file}: инструкция читать context_packet отсутствует в ## Working Mode"
+        )
+
+    @pytest.mark.parametrize("prompt_file", ["architect.md", "backend_dev.md", "frontend_dev.md"])
+    def test_worker_prompt_context_packet_instruction_is_step_0(self, prompt_file):
+        """Инструкция про context_packet пронумерована как шаг 0 в ## Working Mode."""
+        content = (PROMPTS_DIR / prompt_file).read_text(encoding="utf-8")
+        wm_idx = content.find("## Working Mode")
+        wm_section = content[wm_idx:]
+        next_section_idx = wm_section.find("\n## ", 1)
+        wm_body = wm_section[:next_section_idx] if next_section_idx != -1 else wm_section
+        # Шаг 0 должен содержать context_packet
+        assert "0." in wm_body and "context_packet" in wm_body, (
+            f"{prompt_file}: шаг 0 с инструкцией context_packet не найден в ## Working Mode"
+        )
+
+
+# ===========================================================================
+# 4. Unit-тесты models.create_handoff с context_packet
+# ===========================================================================
+
+class TestCreateHandoffContextPacket:
+    """Unit-тесты models.create_handoff — сохранение и чтение context_packet."""
+
+    def test_create_handoff_stores_context_packet_dict(self, conn):
+        """create_handoff с context_packet dict: возвращает его как dict."""
+        pipeline = models.create_pipeline(
+            conn, "PROJ-001", "proj", "dept_feature", [{"role": "backend_head"}]
+        )
+        cp = {
+            "architecture_notes": "Pure functions",
+            "key_files": ["core/models.py"],
+            "constraints": ["No ORM"],
+            "unknowns": [],
+            "handoff_for": "backend_dev",
+        }
+        handoff = models.create_handoff(
+            conn, pipeline["id"], "PROJ-001",
+            from_department="backend",
+            context_packet=cp,
+        )
+        assert handoff["context_packet"] == cp, (
+            "create_handoff не вернул context_packet как dict"
+        )
+
+    def test_create_handoff_context_packet_none_returns_none(self, conn):
+        """create_handoff без context_packet: поле возвращается как None."""
+        pipeline = models.create_pipeline(
+            conn, "PROJ-001", "proj", "dept_feature", [{"role": "backend_head"}]
+        )
+        handoff = models.create_handoff(
+            conn, pipeline["id"], "PROJ-001",
+            from_department="backend",
+            context_packet=None,
+        )
+        assert handoff["context_packet"] is None, (
+            "create_handoff без context_packet должен возвращать None, не что-то другое"
+        )
+
+    def test_create_handoff_context_packet_persisted_in_db(self, conn):
+        """create_handoff с context_packet: поле сохраняется в БД и декодируется при SELECT."""
+        pipeline = models.create_pipeline(
+            conn, "PROJ-001", "proj", "dept_feature", [{"role": "backend_head"}]
+        )
+        cp = {"architecture_notes": "test", "key_files": ["a.py"], "constraints": [],
+              "unknowns": ["q1"], "handoff_for": "backend_dev"}
+        handoff = models.create_handoff(
+            conn, pipeline["id"], "PROJ-001",
+            from_department="backend",
+            context_packet=cp,
+        )
+        # Перечитать из БД через get_handoffs_for_task
+        handoffs = models.get_handoffs_for_task(conn, "PROJ-001")
+        assert len(handoffs) == 1
+        assert handoffs[0]["context_packet"] == cp, (
+            "context_packet не совпадает после повторного чтения из БД"
+        )
+
+    def test_context_packet_in_json_columns(self):
+        """'context_packet' присутствует в models._JSON_COLUMNS."""
+        assert "context_packet" in models._JSON_COLUMNS, (
+            "'context_packet' должен быть в models._JSON_COLUMNS для автодекодирования"
+        )
+
+
+# ===========================================================================
+# 5. Runner-тесты _execute_department_head_step
+# ===========================================================================
+
+class TestExecuteDeptHeadStepContextPacket:
+    """Тесты _execute_department_head_step: context_packet в output и initial context."""
+
+    def test_context_packet_present_in_summary_output(self, conn):
+        """Если dept head вернул context_packet — он включён в summary output для следующего шага."""
+        from agents.runner import _execute_department_head_step
+
+        pipeline = models.create_pipeline(
+            conn, "PROJ-001", "proj", "dept_feature", [{"role": "backend_head"}]
+        )
+        with patch("agents.runner.run_pipeline", return_value=_success_sub_result(pipeline["id"])), \
+             patch("agents.runner.models.create_handoff"):
+            result = _execute_department_head_step(
+                conn=conn,
+                task_id="PROJ-001",
+                project_id="proj",
+                parent_pipeline_id=pipeline["id"],
+                step={"role": "backend_head", "brief": "plan"},
+                dept_head_result=_dept_head_raw_output(with_context_packet=True),
+                next_department="frontend",
+            )
+
+        assert result["success"] is True
+        summary = json.loads(result["output"])
+        assert "context_packet" in summary, (
+            "context_packet должен быть в summary output для следующего dept head"
+        )
+        cp = summary["context_packet"]
+        assert cp["handoff_for"] == "backend_dev"
+        assert "core/models.py" in cp["key_files"]
+
+    def test_context_packet_placed_first_in_worker_initial_context(self, conn):
+        """Если context_packet есть — он первый ключ в initial_previous_output для воркеров."""
+        from agents.runner import _execute_department_head_step
+
+        pipeline = models.create_pipeline(
+            conn, "PROJ-001", "proj", "dept_feature", [{"role": "backend_head"}]
+        )
+        captured_initial_output = {}
+
+        def capture_run_pipeline(conn, task_id, steps, *args, **kwargs):
+            initial = kwargs.get("initial_previous_output", "{}")
+            captured_initial_output["value"] = json.loads(initial)
+            return _success_sub_result(pipeline["id"])
+
+        with patch("agents.runner.run_pipeline", side_effect=capture_run_pipeline), \
+             patch("agents.runner.models.create_handoff"):
+            _execute_department_head_step(
+                conn=conn,
+                task_id="PROJ-001",
+                project_id="proj",
+                parent_pipeline_id=pipeline["id"],
+                step={"role": "backend_head", "brief": "plan"},
+                dept_head_result=_dept_head_raw_output(with_context_packet=True),
+            )
+
+        ctx = captured_initial_output.get("value", {})
+        assert "context_packet" in ctx, (
+            "context_packet отсутствует в initial_previous_output для воркеров"
+        )
+        keys = list(ctx.keys())
+        assert keys[0] == "context_packet", (
+            f"context_packet должен быть первым ключом в initial context, но первый: {keys[0]!r}"
+        )
+
+    def test_missing_context_packet_does_not_block_pipeline(self, conn):
+        """Если context_packet отсутствует — pipeline продолжается (fail-open)."""
+        from agents.runner import _execute_department_head_step
+
+        pipeline = models.create_pipeline(
+            conn, "PROJ-001", "proj", "dept_feature", [{"role": "backend_head"}]
+        )
+        with patch("agents.runner.run_pipeline", return_value=_success_sub_result(pipeline["id"])), \
+             patch("agents.runner.models.create_handoff"):
+            result = _execute_department_head_step(
+                conn=conn,
+                task_id="PROJ-001",
+                project_id="proj",
+                parent_pipeline_id=pipeline["id"],
+                step={"role": "backend_head", "brief": "plan"},
+                dept_head_result=_dept_head_raw_output(with_context_packet=False),
+                next_department="frontend",
+            )
+
+        assert result["success"] is True, (
+            "Pipeline должен продолжаться при отсутствии context_packet (fail-open)"
+        )
+
+    def test_missing_context_packet_not_in_worker_initial_context(self, conn):
+        """Если context_packet отсутствует — его ключа нет в initial context для воркеров."""
+        from agents.runner import _execute_department_head_step
+
+        pipeline = models.create_pipeline(
+            conn, "PROJ-001", "proj", "dept_feature", [{"role": "backend_head"}]
+        )
+        captured = {}
+
+        def capture_run_pipeline(conn, task_id, steps, *args, **kwargs):
+            initial = kwargs.get("initial_previous_output", "{}")
+            captured["value"] = json.loads(initial)
+            return _success_sub_result(pipeline["id"])
+
+        with patch("agents.runner.run_pipeline", side_effect=capture_run_pipeline), \
+             patch("agents.runner.models.create_handoff"):
+            _execute_department_head_step(
+                conn=conn,
+                task_id="PROJ-001",
+                project_id="proj",
+                parent_pipeline_id=pipeline["id"],
+                step={"role": "backend_head", "brief": "plan"},
+                dept_head_result=_dept_head_raw_output(with_context_packet=False),
+            )
+
+        ctx = captured.get("value", {})
+        assert "context_packet" not in ctx, (
+            "context_packet не должен быть в initial context, если dept head его не вернул"
+        )
+        # Но department_head_plan должен всё равно присутствовать
+        assert "department_head_plan" in ctx, (
+            "department_head_plan должен присутствовать в initial context даже без context_packet"
+        )
+
+    def test_context_packet_passed_to_create_handoff(self, conn):
+        """context_packet передаётся в models.create_handoff при сохранении хэндоффа."""
+        from agents.runner import _execute_department_head_step
+
+        pipeline = models.create_pipeline(
+            conn, "PROJ-001", "proj", "dept_feature", [{"role": "backend_head"}]
+        )
+        with patch("agents.runner.run_pipeline", return_value=_success_sub_result(pipeline["id"])), \
+             patch("agents.runner.models.create_handoff") as mock_handoff:
+            _execute_department_head_step(
+                conn=conn,
+                task_id="PROJ-001",
+                project_id="proj",
+                parent_pipeline_id=pipeline["id"],
+                step={"role": "backend_head", "brief": "plan"},
+                dept_head_result=_dept_head_raw_output(with_context_packet=True),
+            )
+
+        assert mock_handoff.called, "models.create_handoff должен быть вызван"
+        _, kwargs = mock_handoff.call_args
+        cp = kwargs.get("context_packet")
+        assert cp is not None, "context_packet должен быть передан в create_handoff"
+        assert cp["handoff_for"] == "backend_dev"
+
+    def test_missing_context_packet_handoff_receives_none(self, conn):
+        """Если context_packet отсутствует — create_handoff вызывается с context_packet=None."""
+        from agents.runner import _execute_department_head_step
+
+        pipeline = models.create_pipeline(
+            conn, "PROJ-001", "proj", "dept_feature", [{"role": "backend_head"}]
+        )
+        with patch("agents.runner.run_pipeline", return_value=_success_sub_result(pipeline["id"])), \
+             patch("agents.runner.models.create_handoff") as mock_handoff:
+            _execute_department_head_step(
+                conn=conn,
+                task_id="PROJ-001",
+                project_id="proj",
+                parent_pipeline_id=pipeline["id"],
+                step={"role": "backend_head", "brief": "plan"},
+                dept_head_result=_dept_head_raw_output(with_context_packet=False),
+            )
+
+        assert mock_handoff.called
+        _, kwargs = mock_handoff.call_args
+        assert kwargs.get("context_packet") is None, (
+            "create_handoff должен получить context_packet=None, если dept head не вернул его"
+        )