diff --git a/mateclaw-server/src/main/java/vip/mate/skill/installer/SkillInstaller.java b/mateclaw-server/src/main/java/vip/mate/skill/installer/SkillInstaller.java
index 944b6dbd..2a4a6a96 100644
--- a/mateclaw-server/src/main/java/vip/mate/skill/installer/SkillInstaller.java
+++ b/mateclaw-server/src/main/java/vip/mate/skill/installer/SkillInstaller.java
@@ -82,7 +82,10 @@ public class SkillInstaller {
      * {@code SkillService.hardDeleteSkill} via {@code DELETE /skills/{id}}.
      */
     public void uninstall(String skillName, Long workspaceId) {
-        List<SkillEntity> skills = skillService.listSkills();
+        // Scope the lookup to this workspace (+ builtin) so a same-named skill in
+        // another workspace is never picked up (which would wrongly 403 below even
+        // though the current workspace has its own skill to uninstall).
+        List<SkillEntity> skills = skillService.listSkills(workspaceId);
         SkillEntity target = skills.stream()
                 .filter(s -> s.getName().equals(skillName))
                 .findFirst()
@@ -147,8 +150,9 @@ public class SkillInstaller {
                 return CompletableFuture.completedFuture(null);
             }
 
-            // 3. 检查是否已存在
-            boolean exists = skillService.listSkills().stream()
+            // 3. 检查是否已存在（按工作区隔离：只在本工作区 + builtin 范围内查重，
+            //    不同工作区的同名技能可以各自独立安装）
+            boolean exists = skillService.listSkills(request.getWorkspaceId()).stream()
                     .anyMatch(s -> s.getName().equals(skillName));
             if (exists && !Boolean.TRUE.equals(request.getOverwrite())) {
                 task.markFailed("Skill '" + skillName + "' already exists. Set overwrite=true to replace.");
@@ -218,7 +222,8 @@ public class SkillInstaller {
             throw new vip.mate.exception.MateClawException("err.skill.name_required", "Cannot determine skill name from bundle");
         }
 
-        boolean exists = skillService.listSkills().stream()
+        // Workspace-scoped dedup: same-named skills in different workspaces coexist.
+        boolean exists = skillService.listSkills(workspaceId).stream()
                 .anyMatch(s -> s.getName().equals(skillName));
         if (exists && !overwrite) {
             throw new vip.mate.exception.MateClawException("err.skill.name_exists",
@@ -263,7 +268,9 @@ public class SkillInstaller {
                                        boolean enable, Long workspaceId) {
         SkillEntity skillEntity;
         if (exists) {
-            skillEntity = skillService.listSkills().stream()
+            // Locate the row to update within THIS workspace (+ builtin), so a
+            // reinstall never grabs a same-named skill owned by another workspace.
+            skillEntity = skillService.listSkills(workspaceId).stream()
                     .filter(s -> s.getName().equals(skillName))
                     .findFirst().orElseThrow();
             skillEntity.setSkillContent(bundle.content());
diff --git a/mateclaw-server/src/main/java/vip/mate/skill/service/SkillService.java b/mateclaw-server/src/main/java/vip/mate/skill/service/SkillService.java
index 6b48796d..49d0b809 100644
--- a/mateclaw-server/src/main/java/vip/mate/skill/service/SkillService.java
+++ b/mateclaw-server/src/main/java/vip/mate/skill/service/SkillService.java
@@ -274,7 +274,8 @@ public class SkillService {
     }
 
     /**
-     * 按名称查找技能（RFC-023：SkillManageTool 重名检查用）
+     * 按名称查找技能（全局，跨所有工作区）。仅用于内置技能同步等全局语义场景；
+     * 工作区相关的重名检查请用 {@link #findByName(String, Long)}。
      */
     public SkillEntity findByName(String name) {
         return skillMapper.selectOne(new LambdaQueryWrapper<SkillEntity>()
@@ -282,6 +283,17 @@ public class SkillService {
                 .last("LIMIT 1"));
     }
 
+    /**
+     * 按名称在指定工作区内查找技能（含 builtin 全局可见）。用于工作区隔离的
+     * 重名/存在性检查，避免跨工作区错误命中别的工作区的同名技能。
+     */
+    public SkillEntity findByName(String name, Long workspaceId) {
+        LambdaQueryWrapper<SkillEntity> wrapper = new LambdaQueryWrapper<SkillEntity>()
+                .eq(SkillEntity::getName, name);
+        applyWorkspaceScope(wrapper, workspaceId);
+        return skillMapper.selectOne(wrapper.last("LIMIT 1"));
+    }
+
     /**
      * 按类型获取技能列表
      */
@@ -323,9 +335,12 @@ public class SkillService {
             throw new MateClawException("err.skill.name_required", "技能名称不能为空");
         }
 
-        // 检查名称唯一性
-        Long count = skillMapper.selectCount(new LambdaQueryWrapper<SkillEntity>()
-                .eq(SkillEntity::getName, skill.getName()));
+        // 名称唯一性按工作区隔离：同名技能只要不在同一工作区（且都不是 builtin）即可共存。
+        // 撞 builtin 名仍视为冲突（builtin 全局可见）。
+        LambdaQueryWrapper<SkillEntity> dupCheck = new LambdaQueryWrapper<SkillEntity>()
+                .eq(SkillEntity::getName, skill.getName());
+        applyWorkspaceScope(dupCheck, skill.getWorkspaceId());
+        Long count = skillMapper.selectCount(dupCheck);
         if (count > 0) {
             throw new MateClawException("err.skill.name_exists", "技能名称已存在: " + skill.getName());
         }
diff --git a/mateclaw-server/src/main/java/vip/mate/skill/synthesis/SkillSynthesisService.java b/mateclaw-server/src/main/java/vip/mate/skill/synthesis/SkillSynthesisService.java
index 230f448c..245570be 100644
--- a/mateclaw-server/src/main/java/vip/mate/skill/synthesis/SkillSynthesisService.java
+++ b/mateclaw-server/src/main/java/vip/mate/skill/synthesis/SkillSynthesisService.java
@@ -95,8 +95,9 @@ public class SkillSynthesisService {
         }
         name = name.strip().toLowerCase().replaceAll("[^a-z0-9._-]", "-");
 
-        // 去重
-        SkillEntity existing = skillService.findByName(name);
+        // 去重（按工作区隔离：只与本工作区 + builtin 的同名技能避让，
+        // 不同工作区的同名技能不应互相影响命名）
+        SkillEntity existing = skillService.findByName(name, workspaceId);
         if (existing != null) {
             name = name + "-" + (System.currentTimeMillis() % 10000);
         }