diff --git a/scripts/README-rebuild-hybrid-knowledge.md b/scripts/README-rebuild-hybrid-knowledge.md
index d4eb4db..8cd2e1b 100644
--- a/scripts/README-rebuild-hybrid-knowledge.md
+++ b/scripts/README-rebuild-hybrid-knowledge.md
@@ -1,6 +1,6 @@
 # 重建 hybrid 知识库（dense + BM25）
 
-面向当前 `knowledge_base/` 目录文档，清空并重建 `biz_hybrid` collection。
+面向当前 `knowledge_base/` 目录文档，**清空并重建**配置中的 Milvus collection（默认 **`biz`**）。
 
 ## 前提
 
@@ -10,7 +10,7 @@
 
 ```yaml
 milvus:
-  collection: biz_hybrid
+  collection: biz
 retrieval:
   search:
     mode: hybrid
@@ -18,20 +18,28 @@ knowledge:
   base-path: knowledge_base/
 ```
 
-## 一键脚本
+## 一键脚本（Python）
 
 在项目根目录执行：
 
-```powershell
-.\scripts\rebuild-hybrid-knowledge.ps1 -Confirm REBUILD
+```bash
+python scripts/rebuild_hybrid_knowledge.py --confirm REBUILD
 ```
 
 指定服务地址：
 
-```powershell
-.\scripts\rebuild-hybrid-knowledge.ps1 -BaseUrl http://127.0.0.1:9900 -Confirm REBUILD
+```bash
+python scripts/rebuild_hybrid_knowledge.py --base-url http://127.0.0.1:9900 --confirm REBUILD
 ```
 
+跳过前后 stats：
+
+```bash
+python scripts/rebuild_hybrid_knowledge.py --confirm REBUILD --skip-stats
+```
+
+依赖：Python 3.9+ 标准库即可（无需 pip 包）。
+
 ## 脚本会做什么
 
 | 步骤 | 动作 |
@@ -43,10 +51,12 @@ knowledge:
 
 服务端 `rebuild-hybrid` 内部顺序：
 
-1. **Drop + recreate** Milvus collection（`milvus.collection`，默认 `biz_hybrid`）
+1. **Drop + recreate** Milvus collection（`milvus.collection`，默认 `biz`）  
+   - 原有向量数据会被删除  
+   - 按 dense + BM25 schema 重建
 2. **清空** MySQL `api_document`
 3. **清空** 内存 L0 索引
-4. **扫描** `knowledge_base/**/*.md` 并 `force` 全量导入  
+4. **扫描** `knowledge_base/**/*.md`（跳过 `README.md`）并 force 全量导入  
    - 写 MySQL 元数据  
    - 切片  
    - 写 dense 向量 + BM25 `search_text`  
@@ -54,17 +64,16 @@ knowledge:
 
 ## 不会做什么
 
-- **不会**删除旧 collection `biz`（需你在 Zilliz 控制台自行决定是否删）
 - **不会**动 `knowledge_base/` 源文件
-- **不会**在未传 `confirm=REBUILD` 时执行
+- **不会**在未传 `--confirm REBUILD` 时执行
 
 ## 手动 curl 等价命令
 
 ```bash
-# 重建（危险）
+# 重建（危险：会清空 biz collection + api_document）
 curl -X POST "http://localhost:9900/api/knowledge/rebuild-hybrid?confirm=REBUILD"
 
-# 仅增量/强制导入（不 drop collection）
+# 仅强制导入（不 drop collection）
 curl -X POST "http://localhost:9900/api/knowledge/init?force=true"
 
 # 统计
@@ -78,8 +87,8 @@ curl "http://localhost:9900/api/knowledge/stats"
 ```json
 {
   "success": true,
-  "collection": "biz_hybrid",
-  "inserted": <大于0>,
+  "collection": "biz",
+  "inserted": 15,
   "failed": 0,
   "milvus": { "recreated": true, "loaded": true }
 }
diff --git a/scripts/rebuild_hybrid_knowledge.py b/scripts/rebuild_hybrid_knowledge.py
new file mode 100644
index 0000000..a05b8a7
--- /dev/null
+++ b/scripts/rebuild_hybrid_knowledge.py
@@ -0,0 +1,176 @@
+#!/usr/bin/env python3
+"""Rebuild knowledge into the configured Milvus collection (default: biz).
+
+Clears:
+  - milvus.collection (drop + recreate dense+BM25 schema)
+  - MySQL api_document
+  - in-memory L0 index
+
+Then force-imports all markdown under server-side knowledge.base-path
+(default: knowledge_base/).
+
+Usage:
+  # start Spring Boot first, then:
+  python scripts/rebuild_hybrid_knowledge.py --confirm REBUILD
+
+  python scripts/rebuild_hybrid_knowledge.py --base-url http://127.0.0.1:9900 --confirm REBUILD
+"""
+
+from __future__ import annotations
+
+import argparse
+import json
+import sys
+import urllib.error
+import urllib.request
+from typing import Any
+
+
+DEFAULT_BASE_URL = "http://localhost:9900"
+
+
+def http_json(method: str, url: str, timeout: float = 3600.0) -> tuple[int, Any]:
+    req = urllib.request.Request(url=url, method=method.upper())
+    req.add_header("Accept", "application/json")
+    try:
+        with urllib.request.urlopen(req, timeout=timeout) as resp:
+            raw = resp.read().decode("utf-8", errors="replace")
+            status = getattr(resp, "status", 200)
+            if not raw.strip():
+                return status, None
+            return status, json.loads(raw)
+    except urllib.error.HTTPError as exc:
+        raw = exc.read().decode("utf-8", errors="replace")
+        body: Any
+        try:
+            body = json.loads(raw) if raw.strip() else None
+        except json.JSONDecodeError:
+            body = raw
+        raise RuntimeError(f"HTTP {method} {url} failed status={exc.code}: {body}") from exc
+    except urllib.error.URLError as exc:
+        raise RuntimeError(f"HTTP {method} {url} failed: {exc}") from exc
+
+
+def pretty(obj: Any) -> str:
+    return json.dumps(obj, ensure_ascii=False, indent=2)
+
+
+def step(title: str) -> None:
+    print()
+    print(f"==> {title}")
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = argparse.ArgumentParser(
+        description="Drop/recreate milvus.collection (default biz), clear MySQL api_document + L0, "
+        "and reimport knowledge_base markdown into dense+BM25."
+    )
+    parser.add_argument(
+        "--base-url",
+        default=DEFAULT_BASE_URL,
+        help=f"Service base URL (default: {DEFAULT_BASE_URL})",
+    )
+    parser.add_argument(
+        "--confirm",
+        required=True,
+        choices=["REBUILD"],
+        help="Must be REBUILD to execute destructive rebuild",
+    )
+    parser.add_argument(
+        "--skip-stats",
+        action="store_true",
+        help="Skip before/after /api/knowledge/stats",
+    )
+    parser.add_argument(
+        "--timeout",
+        type=float,
+        default=7200.0,
+        help="Rebuild request timeout seconds (default: 7200)",
+    )
+    args = parser.parse_args(argv)
+
+    base_url = args.base_url.rstrip("/")
+
+    print("Hybrid knowledge rebuild")
+    print(f"  BaseUrl : {base_url}")
+    print(f"  Confirm : {args.confirm}")
+    print("  Source  : knowledge_base/ (server-side knowledge.base-path)")
+    print()
+    print("This will DESTROY data in:")
+    print("  - Milvus collection milvus.collection (default: biz)")
+    print("  - MySQL table api_document")
+    print("  - In-memory L0 knowledge index")
+    print("Then re-import all markdown under knowledge_base.")
+    print()
+
+    # 1) health
+    step("Check service health")
+    try:
+        status, body = http_json("GET", f"{base_url}/milvus/health", timeout=30)
+        print(f"  milvus health status={status}")
+        print(pretty(body))
+    except Exception as exc:  # noqa: BLE001 - ops script should continue on soft health failure
+        print(f"  WARN: /milvus/health failed: {exc}")
+        print("  Continue if app is up but milvus health endpoint has issues.")
+
+    # 2) stats before
+    if not args.skip_stats:
+        step("Knowledge stats (before)")
+        try:
+            _, body = http_json("GET", f"{base_url}/api/knowledge/stats", timeout=30)
+            print(pretty(body))
+        except Exception as exc:  # noqa: BLE001
+            print(f"  WARN: stats before failed: {exc}")
+
+    # 3) rebuild
+    step("POST /api/knowledge/rebuild-hybrid?confirm=REBUILD")
+    rebuild_url = f"{base_url}/api/knowledge/rebuild-hybrid?confirm={args.confirm}"
+    try:
+        status, body = http_json("POST", rebuild_url, timeout=args.timeout)
+    except RuntimeError as exc:
+        print(str(exc))
+        return 1
+
+    print(f"  HTTP {status}")
+    print(pretty(body))
+
+    if not isinstance(body, dict):
+        print("Unexpected rebuild response type", file=sys.stderr)
+        return 1
+
+    inserted = int(body.get("inserted") or 0)
+    failed = int(body.get("failed") or 0)
+    success = bool(body.get("success"))
+
+    if not success:
+        if inserted <= 0:
+            print()
+            print("Rebuild reported failure and inserted=0. Inspect details above.", file=sys.stderr)
+            return 2
+        print()
+        print(f"Rebuild finished with failed={failed} inserted={inserted}. Review details.")
+    else:
+        print()
+        print(f"Rebuild OK: inserted={inserted}, failed={failed}")
+
+    # 4) stats after
+    if not args.skip_stats:
+        step("Knowledge stats (after)")
+        try:
+            _, body = http_json("GET", f"{base_url}/api/knowledge/stats", timeout=30)
+            print(pretty(body))
+        except Exception as exc:  # noqa: BLE001
+            print(f"  WARN: stats after failed: {exc}")
+
+    print()
+    print("Done.")
+    print("Next:")
+    print("  1) Ensure application.yml has:")
+    print("       milvus.collection: biz")
+    print("       retrieval.search.mode: hybrid")
+    print("  2) Smoke test lookup_knowledge / chat with a known doc query")
+    return 0 if success or inserted > 0 else 2
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/src/main/java/com/superbiz/agent/constant/MilvusConstants.java b/src/main/java/com/superbiz/agent/constant/MilvusConstants.java
index a274833..99e0a21 100644
--- a/src/main/java/com/superbiz/agent/constant/MilvusConstants.java
+++ b/src/main/java/com/superbiz/agent/constant/MilvusConstants.java
@@ -8,14 +8,15 @@ public class MilvusConstants {
     public static final String MILVUS_DB_NAME = "default";
     
     /**
-     * Legacy collection name (pre hybrid). Knowledge path uses milvus.collection (default biz_hybrid).
+     * Default knowledge collection name (dense + BM25).
+     * Overridable via {@code milvus.collection}.
      */
     public static final String MILVUS_COLLECTION_NAME = "biz";
 
     /**
-     * Default hybrid dense+BM25 collection.
+     * Alias kept for readability in hybrid-related code.
      */
-    public static final String MILVUS_HYBRID_COLLECTION_NAME = "biz_hybrid";
+    public static final String MILVUS_HYBRID_COLLECTION_NAME = MILVUS_COLLECTION_NAME;
     
     /**
      * 向量维度（豆包 embedding 模型的维度）
diff --git a/src/main/java/com/superbiz/agent/controller/KnowledgeBaseController.java b/src/main/java/com/superbiz/agent/controller/KnowledgeBaseController.java
index 80e3680..c19fe8b 100644
--- a/src/main/java/com/superbiz/agent/controller/KnowledgeBaseController.java
+++ b/src/main/java/com/superbiz/agent/controller/KnowledgeBaseController.java
@@ -67,7 +67,7 @@ public class KnowledgeBaseController {
      * 清空 hybrid collection + MySQL api_document + L0 内存索引，
      * 再从 knowledge_base 全量重建 dense+BM25 索引。
      *
-     * <p>危险操作：会删除 {@code milvus.collection}（默认 biz_hybrid）与文档元数据表数据。
+     * <p>危险操作：会删除 {@code milvus.collection}（默认 {@code biz}）与文档元数据表数据。
      * 需要显式 confirm=REBUILD。</p>
      */
     @PostMapping("/rebuild-hybrid")
diff --git a/src/main/java/com/superbiz/agent/service/KnowledgeBaseInitService.java b/src/main/java/com/superbiz/agent/service/KnowledgeBaseInitService.java
index becf396..c0a9efc 100644
--- a/src/main/java/com/superbiz/agent/service/KnowledgeBaseInitService.java
+++ b/src/main/java/com/superbiz/agent/service/KnowledgeBaseInitService.java
@@ -57,7 +57,7 @@ public class KnowledgeBaseInitService {
 
     /**
      * Drop hybrid collection, clear MySQL api_document + L0 memory index,
-     * then force-import all markdown under knowledge.base-path into biz_hybrid.
+     * then force-import all markdown under knowledge.base-path into milvus.collection (default biz).
      */
     @Transactional(rollbackFor = Exception.class)
     public RebuildResult rebuildHybridFromKnowledgeBase() {
@@ -82,6 +82,8 @@ public class KnowledgeBaseInitService {
         rebuild.setInit(init);
         rebuild.setL0IndexSizeAfterInit(knowledgeIndexService.getIndexSize());
         rebuild.setMysqlDocumentsAfterInit(apiDocumentRepository.count());
+        // Success when at least one doc indexed and no hard failures.
+        // README-like docs are skipped by scanner; remaining failures still mark unsuccessful.
         rebuild.setSuccess(init.getFailed() == 0 && init.getInserted() > 0);
         logger.info("Hybrid knowledge rebuild finished: success={}, inserted={}, failed={}",
                 rebuild.isSuccess(), init.getInserted(), init.getFailed());
@@ -257,7 +259,11 @@ public class KnowledgeBaseInitService {
             Files.walkFileTree(baseDir, new SimpleFileVisitor<Path>() {
                 @Override
                 public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
-                    if (file.toString().endsWith(".md")) {
+                    String name = file.getFileName() == null ? "" : file.getFileName().toString();
+                    // Import content docs only; skip README/index markdown without frontmatter.
+                    if (name.endsWith(".md")
+                            && !name.equalsIgnoreCase("README.md")
+                            && !name.equalsIgnoreCase("readme.md")) {
                         files.add(file);
                     }
                     return FileVisitResult.CONTINUE;
diff --git a/src/main/java/com/superbiz/agent/service/milvus/MilvusHybridKnowledgeStore.java b/src/main/java/com/superbiz/agent/service/milvus/MilvusHybridKnowledgeStore.java
index c119b35..c954f89 100644
--- a/src/main/java/com/superbiz/agent/service/milvus/MilvusHybridKnowledgeStore.java
+++ b/src/main/java/com/superbiz/agent/service/milvus/MilvusHybridKnowledgeStore.java
@@ -61,8 +61,8 @@ public class MilvusHybridKnowledgeStore {
 
     private final MilvusProperties milvusProperties;
 
-    @Value("${milvus.collection:biz_hybrid}")
-    private String collectionName = "biz_hybrid";
+    @Value("${milvus.collection:biz}")
+    private String collectionName = "biz";
 
     @Value("${retrieval.hybrid.rrf-k:60}")
     private int rrfK = 60;
@@ -144,8 +144,8 @@ public class MilvusHybridKnowledgeStore {
     }
 
     /**
-     * Drop the hybrid collection (if present) and recreate empty dense+BM25 schema.
-     * Used by knowledge rebuild scripts. Does not touch legacy {@code biz} collection.
+     * Drop the configured knowledge collection (if present) and recreate empty dense+BM25 schema.
+     * Used by knowledge rebuild scripts. Existing vectors in this collection are destroyed.
      */
     public synchronized Map<String, Object> dropAndRecreateCollection() {
         Map<String, Object> result = new LinkedHashMap<>();
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index f3cf67e..6db6800 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -25,8 +25,8 @@ milvus:
   token: ${MILVUS_TOKEN}
   secure: true
   vector-dim: 1024  # BGE-M3 = 1024，换模型时同步改
-  # dense+BM25 hybrid collection (requires reindex; legacy "biz" is not used by knowledge path)
-  collection: biz_hybrid
+  # knowledge collection (drop+recreate on rebuild; dense+BM25 schema)
+  collection: biz
 
 # =====================================================
 # 模型路由配置
@@ -158,7 +158,10 @@ document:
 
 # RAG 配置
 rag:
-  top-k: 3  # 检索返回的最相似文档数量
+  top-k: 3  # legacy fallback when retrieve-k/return-n absent
+  retrieve-k: 20
+  return-n: 5
+  max-chunks-per-document: 2
   sidecar:
     spring-ai:
       enabled: false
@@ -176,12 +179,6 @@ retrieval:
     highly-relevant-threshold: 0.75   # similarity >= 0.75 → HIGHLY_RELEVANT
     reference-threshold: 0.5          # similarity >= 0.5 → REFERENCE
 
-# RAG 召回宽度（Delivery 1）
-rag:
-  retrieve-k: 20
-  return-n: 5
-  max-chunks-per-document: 2
-
 # Prometheus 配置
 prometheus:
   base-url: http://localhost:9090
diff --git a/src/test/java/com/superbiz/agent/service/VectorSearchServiceTest.java b/src/test/java/com/superbiz/agent/service/VectorSearchServiceTest.java
index 9945b21..5c94470 100644
--- a/src/test/java/com/superbiz/agent/service/VectorSearchServiceTest.java
+++ b/src/test/java/com/superbiz/agent/service/VectorSearchServiceTest.java
@@ -23,7 +23,7 @@ class VectorSearchServiceTest {
         VectorSearchService.SearchResult expected = result("doc-1", 0.2f);
         when(store.searchDense(eq("query"), eq(List.of(0.1f, 0.2f)), eq(3), isNull()))
                 .thenReturn(List.of(expected));
-        when(store.collectionName()).thenReturn("biz_hybrid");
+        when(store.collectionName()).thenReturn("biz");
 
         VectorSearchService service = new VectorSearchService();
         ReflectionTestUtils.setField(service, "knowledgeStore", store);
@@ -44,7 +44,7 @@ class VectorSearchServiceTest {
         VectorSearchService.SearchResult expected = result("doc-h", 0.4f);
         when(store.searchHybrid(eq("pool"), eq(List.of(0.3f)), eq(5), eq("mysql")))
                 .thenReturn(List.of(expected));
-        when(store.collectionName()).thenReturn("biz_hybrid");
+        when(store.collectionName()).thenReturn("biz");
 
         VectorSearchService service = new VectorSearchService();
         ReflectionTestUtils.setField(service, "knowledgeStore", store);