diff --git a/CLAUDE.md b/CLAUDE.md
index 8ee721b..a95e2fe 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -88,7 +88,8 @@
 
 ### 脚本 Agent(流式 SSE)
 - 端点 `POST /api/projects/{id}/script-agent-stream/` → `text/event-stream`,事件 `tool`/`delta`/`draft`/`saved`/`done`/`error`。**DRF 必须挂 `ServerSentEventRenderer` 否则 406**。
-- 核心 [script_agent.py](core/backend/apps/ai/script_agent.py):加载 `skills/ecommerce-video-script/` 作系统提示词;3 模式(auto/theme/revise)+ **精准改一镜**(`target_index`,后端 `_merge_single_segment` 强制保留其余镜);多模型(`model_config_id`)。
+- 核心 [script_agent.py](core/backend/apps/ai/script_agent.py):加载 [core/backend/skills/ecommerce-video-script/](core/backend/skills/ecommerce-video-script/) 作系统提示词;3 模式(auto/theme/revise)+ **精准改一镜**(`target_index`,后端 `_merge_single_segment` 强制保留其余镜);多模型(`model_config_id`)。
+  - ⚠️ **skills 必须放在 `core/backend/` 内**(随后端打进 Docker 镜像)。镜像由 `./core/backend` 构建,skills 若放仓库根则不在构建上下文 → 镜像里没有 → 提示词加载为空 → 提取吐散文解析失败 / 脚本退化。提取的 skill 同理:[core/backend/skills/ecommerce-entity-extract/](core/backend/skills/ecommerce-entity-extract/)。
 - **结构化 ScriptDraft 契约**:`narration`(口播/旁白,扁平兼容下游)+ `dialogue:[{speaker,line}]`(剧情对白,默认空,用户聊天提要求才补)+ `role/speaker/product_exposure/entity_refs`。落 `ScriptVersion.metadata`(hook/tone/entities)+ `ScriptSegment` 字段,并回填 `project.metadata`(cast/scenes/script_entities)给下游。
 - **改稿用基准稿时长**(`effective_duration`),别用请求默认 60 否则截掉 90s 稿尾镜。**所有 `target_index` 判断用 `is None` 不用真值**(0 是合法镜号)。
 
diff --git a/core/backend/apps/ai/script_agent.py b/core/backend/apps/ai/script_agent.py
index d04b4e3..a35d887 100644
--- a/core/backend/apps/ai/script_agent.py
+++ b/core/backend/apps/ai/script_agent.py
@@ -42,7 +42,13 @@ def _skill_dir() -> Path:
     override = getattr(settings, "ECOMMERCE_SKILL_DIR", None)
     if override:
         return Path(override)
-    return Path(settings.BASE_DIR).parent.parent / "skills" / "ecommerce-video-script"
+    # skills 已随后端打进镜像(core/backend/skills);优先 BASE_DIR/skills,回落仓库根(本地/旧布局)。
+    # 旧版只看仓库根 → 镜像里没有(构建上下文是 ./core/backend)→ 提示词为空、退化兜底。详见 services._skills_root。
+    base = Path(settings.BASE_DIR)
+    for cand in (base / "skills", base.parent.parent / "skills"):
+        if (cand / "ecommerce-video-script").is_dir():
+            return cand / "ecommerce-video-script"
+    return base / "skills" / "ecommerce-video-script"
 
 
 @lru_cache(maxsize=1)
diff --git a/core/backend/apps/ai/services.py b/core/backend/apps/ai/services.py
index f05fca9..1f6977b 100644
--- a/core/backend/apps/ai/services.py
+++ b/core/backend/apps/ai/services.py
@@ -221,13 +221,27 @@ def extract_cast_and_scenes(*, project, user, content: str) -> dict:
         return empty
 
 
-def _load_skill_system_prompt(name: str) -> str:
-    """读取 skills/<name>/SKILL.md + references/*.md 拼成系统提示词(领域知识)。缺文件返回空串,不致命。"""
+def _skills_root() -> "Path":
+    """skills 根目录。优先 BASE_DIR/skills(= core/backend/skills,随后端打进 Docker 镜像);
+    回落仓库根 BASE_DIR.parent.parent/skills(本地/旧布局)。
+
+    ⚠️ 历史坑:镜像由 `./core/backend` 构建,skills 旧在仓库根 → 不在构建上下文 → 镜像里没有 →
+    `_load_skill_system_prompt` 返回空串 → 提取拿不到「只输出 JSON」铁律 → 模型吐散文 → 解析失败。
+    现 skills 已挪进 core/backend 随镜像打包;此处仍保留双路径兜底。"""
     from pathlib import Path
 
     from django.conf import settings
 
-    skill_dir = Path(settings.BASE_DIR).parent.parent / "skills" / name
+    base = Path(settings.BASE_DIR)
+    for cand in (base / "skills", base.parent.parent / "skills"):
+        if cand.is_dir():
+            return cand
+    return base / "skills"
+
+
+def _load_skill_system_prompt(name: str) -> str:
+    """读取 skills/<name>/SKILL.md + references/*.md 拼成系统提示词(领域知识)。缺文件返回空串,不致命。"""
+    skill_dir = _skills_root() / name
     parts: list[str] = []
     main = skill_dir / "SKILL.md"
     if main.exists():
@@ -340,7 +354,14 @@ def _collect_extract_text(provider, model_config, messages) -> tuple[str, dict]:
     content = "".join(content_parts).strip()
     reasoning = "".join(reasoning_parts).strip()
     text = content or reasoning
-    payload = {"streamed": True, "model": model_config.name, "content": content, "had_reasoning": bool(reasoning)}
+    payload = {
+        "streamed": True,
+        "model": model_config.name,
+        "content": content,
+        "reasoning_chars": len(reasoning),
+        "reasoning_preview": reasoning[:500],  # 失败时看一眼模型在想啥/有没有跑题
+        "system_chars": sum(len(m.get("content") or "") for m in messages if m.get("role") == "system"),
+    }
     return text, payload
 
 
@@ -446,6 +467,7 @@ def run_extract_entities_task(*, task_id: str) -> None:
     messages = payload.get("messages") or []
     model_config = task.model_config
     reservation = task.credit_reservation
+    response: dict = {}  # 模型返回的精简存档;失败时也落库(便于事后定位"模型到底吐了啥")
     try:
         task.status = AITask.Status.SUBMITTED
         task.submitted_at = timezone.now()
@@ -502,8 +524,9 @@ def run_extract_entities_task(*, task_id: str) -> None:
         with transaction.atomic():
             task.status = AITask.Status.FAILED
             task.error_message = msg
+            task.response_payload = response  # 即便失败也存下模型输出片段(content/reasoning 长度等),供事后定位
             task.completed_at = timezone.now()
-            task.save(update_fields=["status", "error_message", "completed_at", "updated_at"])
+            task.save(update_fields=["status", "response_payload", "error_message", "completed_at", "updated_at"])
             release_credit(reservation=reservation, reason=msg)
 
 
diff --git a/core/backend/apps/ai/tests.py b/core/backend/apps/ai/tests.py
index f974e01..5f2375f 100644
--- a/core/backend/apps/ai/tests.py
+++ b/core/backend/apps/ai/tests.py
@@ -1,10 +1,35 @@
 import json
+from pathlib import Path
 
+from django.conf import settings
 from django.test import SimpleTestCase
 
 from apps.ai.script_agent import normalize_draft
 
 
+class SkillPromptBundlingTests(SimpleTestCase):
+    """守护「skills 必须随后端打进镜像」这条线 —— 历史上 skills 放仓库根、不在 Docker 构建上下文
+    (`./core/backend`)→ 镜像里没有 → 提示词加载为空 → 提取模型收不到「只输出 JSON」铁律 → 吐散文
+    → 「提取结果解析失败」。这两条断言锁死:① skills 落在 BASE_DIR 内(随镜像走);② 提示词非空且带铁律。"""
+
+    def test_skills_dir_bundled_under_base_dir(self):
+        """skills 必须在 BASE_DIR(=core/backend)内,才会被 Dockerfile 的 `COPY . .` 打进镜像。"""
+        for name in ("ecommerce-entity-extract", "ecommerce-video-script"):
+            self.assertTrue(
+                (Path(settings.BASE_DIR) / "skills" / name / "SKILL.md").exists(),
+                f"skills/{name}/SKILL.md 不在 BASE_DIR 内 —— 镜像将丢失该提示词(详见 services._skills_root)",
+            )
+
+    def test_entity_extract_prompt_loads_nonempty_with_json_rule(self):
+        """提取系统提示词必须加载到非空内容,且含「只输出 JSON」铁律(空 → 模型不吐 JSON → 解析失败)。"""
+        from apps.ai.services import _load_skill_system_prompt
+
+        prompt = _load_skill_system_prompt("ecommerce-entity-extract")
+        self.assertGreater(len(prompt), 1000, "提取提示词为空/过短 —— skills 没被正确加载")
+        self.assertIn("JSON", prompt)
+        self.assertIn("entities", prompt)
+
+
 class NormalizeDraftTests(SimpleTestCase):
     """normalize_draft 对模型不按契约输出的容错(防「旁白/画面全空」回归)。"""
 
diff --git a/skills/ecommerce-entity-extract/SKILL.md b/core/backend/skills/ecommerce-entity-extract/SKILL.md
similarity index 100%
rename from skills/ecommerce-entity-extract/SKILL.md
rename to core/backend/skills/ecommerce-entity-extract/SKILL.md
diff --git a/skills/ecommerce-entity-extract/references/examples.md b/core/backend/skills/ecommerce-entity-extract/references/examples.md
similarity index 100%
rename from skills/ecommerce-entity-extract/references/examples.md
rename to core/backend/skills/ecommerce-entity-extract/references/examples.md
diff --git a/skills/ecommerce-video-script/SKILL.md b/core/backend/skills/ecommerce-video-script/SKILL.md
similarity index 100%
rename from skills/ecommerce-video-script/SKILL.md
rename to core/backend/skills/ecommerce-video-script/SKILL.md
diff --git a/skills/ecommerce-video-script/references/category-playbook.md b/core/backend/skills/ecommerce-video-script/references/category-playbook.md
similarity index 100%
rename from skills/ecommerce-video-script/references/category-playbook.md
rename to core/backend/skills/ecommerce-video-script/references/category-playbook.md
diff --git a/skills/ecommerce-video-script/references/checklist.md b/core/backend/skills/ecommerce-video-script/references/checklist.md
similarity index 100%
rename from skills/ecommerce-video-script/references/checklist.md
rename to core/backend/skills/ecommerce-video-script/references/checklist.md
diff --git a/skills/ecommerce-video-script/references/hook-library.md b/core/backend/skills/ecommerce-video-script/references/hook-library.md
similarity index 100%
rename from skills/ecommerce-video-script/references/hook-library.md
rename to core/backend/skills/ecommerce-video-script/references/hook-library.md
diff --git a/skills/ecommerce-video-script/references/methodology.md b/core/backend/skills/ecommerce-video-script/references/methodology.md
similarity index 100%
rename from skills/ecommerce-video-script/references/methodology.md
rename to core/backend/skills/ecommerce-video-script/references/methodology.md
diff --git a/skills/ecommerce-video-script/references/platform-tone.md b/core/backend/skills/ecommerce-video-script/references/platform-tone.md
similarity index 100%
rename from skills/ecommerce-video-script/references/platform-tone.md
rename to core/backend/skills/ecommerce-video-script/references/platform-tone.md