diff --git a/internal/app/hostcaps.go b/internal/app/hostcaps.go
index c4c90f8..7032ff2 100644
--- a/internal/app/hostcaps.go
+++ b/internal/app/hostcaps.go
@@ -3,7 +3,6 @@ package app
 import (
 	"agent-system-backend/pkg/extension"
 	"context"
-	"errors"
 	"fmt"
 	"sync"
 
@@ -140,14 +139,42 @@ func (h inprocHost) KnowledgeWrite(ctx context.Context, docs []core.KnowledgeDoc
 	return h.caps.pipe.IndexChunks(ctx, core.ID(h.owner), docs)
 }
 
-// KnowledgePublish/KnowledgeDelete EXT-9 幂等发布与撤销（本提交为占位——
-// 红测先行，实现在后续提交落地）。
+// KnowledgePublish 幂等发布（EXT-9）：按 docs 的 ref 整批替换——先清该 owner
+// 下同 ref 旧行与旧向量（跨来源也清：ref 是发布单元），再走 KnowledgeWrite
+// 语义（Owner/Source 强制同彼）。重试产生相同结果。
 func (h inprocHost) KnowledgePublish(ctx context.Context, docs []core.KnowledgeDoc, embed bool) error {
-	return errors.New("ext-9: knowledge publish not implemented yet")
+	if len(docs) == 0 {
+		return nil
+	}
+	refs := map[string]bool{}
+	for i := range docs {
+		docs[i].Owner = core.ID(h.owner)
+		if docs[i].Source == "" {
+			docs[i].Source = "plugin:" + h.pluginID
+		}
+		if docs[i].Ref != "" {
+			refs[docs[i].Ref] = true
+		}
+	}
+	for ref := range refs {
+		if err := h.caps.st.DeleteKnowledgeByRef(h.owner, ref); err != nil {
+			return err
+		}
+		if err := h.caps.st.DeleteKnowledgeVectors(ctx, h.owner, ref); err != nil {
+			return err
+		}
+	}
+	return h.KnowledgeWrite(ctx, docs, embed)
 }
 
+// KnowledgeDelete 撤销本插件来源（EXT-9）：前缀强制 plugin:<自身ID>——manual
+// 或他人来源拒绝（fail-closed）；删行+向量，幂等。
 func (h inprocHost) KnowledgeDelete(ctx context.Context, sourcePrefix string) error {
-	return errors.New("ext-9: knowledge delete not implemented yet")
+	if sourcePrefix != "plugin:"+h.pluginID {
+		return fmt.Errorf("ext-9: plugins may only delete their own source prefix, want %q", "plugin:"+h.pluginID)
+	}
+	_, err := h.caps.st.DeleteKnowledgeBySource(ctx, h.owner, sourcePrefix)
+	return err
 }
 
 // TaskCreate/TaskUpdate 后台任务台账：基座只记进度/状态，执行体由下游自跑（H5）。
diff --git a/internal/server/server.go b/internal/server/server.go
index 4bce8da..930429e 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -1058,11 +1058,14 @@ func (s *Server) upload(w http.ResponseWriter, r *http.Request) {
 		_ = s.Cards.Update(owner, ingestCard)
 	}
 	// 文本可解析的进检索索引（管线分块+全文+可选向量）。
-	if plain := doc.PlainText(); plain != "" && len(plain) < 200000 {
-		if s.Indexer != nil {
-			_ = s.Indexer.IndexDocument(owner, projectID, "upload", art.Name, art.ID, plain)
-		} else {
-			_ = s.st.AddKnowledge(core.KnowledgeDoc{Owner: owner, ProjectID: projectID, Source: "upload", Title: art.Name, Ref: art.ID, Chunk: plain})
+	// EXT-9：宿主关闭自动索引时跳过（发布决定移交下游命令层；原件与摄取卡不变）。
+	if !s.DisableUploadIndexing {
+		if plain := doc.PlainText(); plain != "" && len(plain) < 200000 {
+			if s.Indexer != nil {
+				_ = s.Indexer.IndexDocument(owner, projectID, "upload", art.Name, art.ID, plain)
+			} else {
+				_ = s.st.AddKnowledge(core.KnowledgeDoc{Owner: owner, ProjectID: projectID, Source: "upload", Title: art.Name, Ref: art.ID, Chunk: plain})
+			}
 		}
 	}
 	writeJSON(w, http.StatusOK, core.UploadInfo{ArtifactID: art.ID, Filename: art.Name, MIME: mime, Size: art.Size, Parsed: &doc})
diff --git a/internal/store/content.go b/internal/store/content.go
index 792d49d..bdc17ef 100644
--- a/internal/store/content.go
+++ b/internal/store/content.go
@@ -312,6 +312,40 @@ func (s *Store) DeleteKnowledgeByRef(owner, ref string) error {
 	return err
 }
 
+// DeleteKnowledgeBySource 按来源前缀撤销知识（EXT-9）：删除该 owner 下 source 匹配
+// 前缀的行，并经 ref 关联清理向量；幂等（无匹配返回 0, nil）。供宿主在
+// KnowledgeDelete（前缀已强制 plugin:<插件ID>）后调用——不作用他人来源。
+func (s *Store) DeleteKnowledgeBySource(ctx context.Context, owner, sourcePrefix string) (int64, error) {
+	rows, err := s.db.QueryContext(ctx, s.q(`SELECT DISTINCT ref FROM knowledge WHERE owner=? AND source LIKE ?`), owner, sourcePrefix+"%")
+	if err != nil {
+		return 0, err
+	}
+	refs := []string{}
+	for rows.Next() {
+		var r string
+		if err := rows.Scan(&r); err != nil {
+			rows.Close()
+			return 0, err
+		}
+		refs = append(refs, r)
+	}
+	rows.Close()
+	if err := rows.Err(); err != nil {
+		return 0, err
+	}
+	for _, r := range refs {
+		if err := s.DeleteKnowledgeVectors(ctx, owner, r); err != nil {
+			return 0, err
+		}
+	}
+	res, err := s.db.ExecContext(ctx, s.q(`DELETE FROM knowledge WHERE owner=? AND source LIKE ?`), owner, sourcePrefix+"%")
+	if err != nil {
+		return 0, err
+	}
+	n, _ := res.RowsAffected()
+	return n, nil
+}
+
 func (s *Store) SearchKnowledge(owner string, q core.RetrievalQuery) ([]core.RetrievalHit, error) {
 	if s.dialect.name() == "postgres" {
 		return s.searchKnowledgePG(owner, q)