diff --git a/mateclaw-server/src/main/java/vip/mate/skill/runtime/SkillRuntimeService.java b/mateclaw-server/src/main/java/vip/mate/skill/runtime/SkillRuntimeService.java
index 4ba52cc9..b7e42f40 100644
--- a/mateclaw-server/src/main/java/vip/mate/skill/runtime/SkillRuntimeService.java
+++ b/mateclaw-server/src/main/java/vip/mate/skill/runtime/SkillRuntimeService.java
@@ -202,6 +202,19 @@ public class SkillRuntimeService {
         return refreshActiveSkills();
     }
 
+    /**
+     * Workspace-scoped view of the active skills: builtin + global (virtual)
+     * skills plus only the skills owned by {@code workspaceId}. Reads the same
+     * process-global cache and filters at read time (no per-workspace cache),
+     * so an agent in one workspace never sees another workspace's same-named
+     * skill. Used by the agent runtime execution path.
+     */
+    public List<ResolvedSkill> getActiveSkills(Long workspaceId) {
+        return getActiveSkills().stream()
+            .filter(s -> matchesWorkspace(s, workspaceId))
+            .collect(Collectors.toList());
+    }
+
     /**
      * 刷新 active skills 缓存
      * 进入 active set 的 skill 必须同时满足：
@@ -328,6 +341,20 @@ public class SkillRuntimeService {
             .orElse(null);
     }
 
+    /**
+     * Workspace-scoped {@link #findActiveSkill(String)}: resolves {@code name}
+     * only among skills visible to {@code workspaceId} (builtin + global +
+     * that workspace's own), so a same-named skill in another workspace is
+     * never returned to an agent's load / read / execute path.
+     */
+    public ResolvedSkill findActiveSkill(String name, Long workspaceId) {
+        return getActiveSkills().stream()
+            .filter(s -> s.getName().equals(name))
+            .filter(s -> matchesWorkspace(s, workspaceId))
+            .findFirst()
+            .orElse(null);
+    }
+
     /**
      * 构建技能 prompt 增强片段（全局，向后兼容）
      */
@@ -739,9 +766,20 @@ public class SkillRuntimeService {
      * visible only inside its owning workspace.
      */
     static boolean matchesWorkspace(ResolvedSkill skill, long agentWorkspaceId) {
+        return matchesWorkspace(skill, Long.valueOf(agentWorkspaceId));
+    }
+
+    /**
+     * Nullable-workspace variant used by the execution-side overloads: a
+     * {@code null} execution workspace (unresolved) sees only builtin and
+     * global ({@code null}-workspace, e.g. MCP virtual) skills — never another
+     * workspace's owned skills, so an unresolved context can never escalate
+     * into another tenant's skills.
+     */
+    public static boolean matchesWorkspace(ResolvedSkill skill, Long workspaceId) {
         if (skill.isBuiltin()) return true;
         Long skillWs = skill.getWorkspaceId();
         if (skillWs == null) return true;
-        return skillWs == agentWorkspaceId;
+        return workspaceId != null && skillWs.equals(workspaceId);
     }
 }
diff --git a/mateclaw-server/src/test/java/vip/mate/skill/runtime/SkillRuntimeServiceWorkspaceExecutionTest.java b/mateclaw-server/src/test/java/vip/mate/skill/runtime/SkillRuntimeServiceWorkspaceExecutionTest.java
new file mode 100644
index 00000000..a2c2e685
--- /dev/null
+++ b/mateclaw-server/src/test/java/vip/mate/skill/runtime/SkillRuntimeServiceWorkspaceExecutionTest.java
@@ -0,0 +1,144 @@
+package vip.mate.skill.runtime;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import vip.mate.skill.acp.AcpSkillBridge;
+import vip.mate.skill.lessons.SkillLessonsService;
+import vip.mate.skill.mcp.McpSkillBridge;
+import vip.mate.skill.model.SkillEntity;
+import vip.mate.skill.runtime.model.ResolvedSkill;
+import vip.mate.skill.service.SkillService;
+import vip.mate.skill.usage.SkillUsageService;
+
+import java.util.List;
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+/**
+ * Execution-side workspace isolation for {@link SkillRuntimeService}: the
+ * runtime resolves skills by name for the agent's load / read / execute path.
+ * Two skills sharing a name in different workspaces (possible since skills are
+ * workspace-scoped) must resolve independently — an agent in one workspace must
+ * never load or read the other workspace's same-named skill. Builtin and
+ * global (null-workspace, e.g. MCP virtual) skills stay visible everywhere.
+ */
+class SkillRuntimeServiceWorkspaceExecutionTest {
+
+    private SkillRuntimeService runtimeWith(List<ResolvedSkill> resolvedSkills, List<SkillEntity> entities) {
+        SkillService skillService = mock(SkillService.class);
+        SkillPackageResolver resolver = mock(SkillPackageResolver.class);
+        SkillLessonsService lessonsService = mock(SkillLessonsService.class);
+        McpSkillBridge mcpBridge = mock(McpSkillBridge.class);
+        AcpSkillBridge acpBridge = mock(AcpSkillBridge.class);
+        SkillUsageService usageService = mock(SkillUsageService.class);
+
+        when(skillService.listEnabledSkills()).thenReturn(entities);
+        for (int i = 0; i < entities.size(); i++) {
+            when(resolver.resolve(entities.get(i))).thenReturn(resolvedSkills.get(i));
+        }
+        when(mcpBridge.listMcpDerivedResolvedSkills()).thenReturn(List.of());
+        when(acpBridge.listAcpDerivedResolvedSkills()).thenReturn(List.of());
+        when(usageService.recentLoadedSkillNames(null, 8)).thenReturn(Set.of());
+        when(usageService.frequentlyLoadedSkillNames(8)).thenReturn(Set.of());
+
+        return new SkillRuntimeService(
+                skillService, resolver, lessonsService, mcpBridge, acpBridge, usageService);
+    }
+
+    @Test
+    @DisplayName("same-named skills in different workspaces resolve independently")
+    void sameNameDifferentWorkspacesResolveIndependently() {
+        SkillEntity builtin = entity(1L, "bar", "builtin");
+        SkillEntity fooWs1 = entity(2L, "foo", "dynamic");
+        SkillEntity fooWs2 = entity(3L, "foo", "dynamic");
+        SkillRuntimeService runtime = runtimeWith(
+                List.of(resolved(builtin, true, null), resolved(fooWs1, false, 1L), resolved(fooWs2, false, 2L)),
+                List.of(builtin, fooWs1, fooWs2));
+
+        // Each workspace resolves its OWN foo — never the other's.
+        assertEquals(2L, runtime.findActiveSkill("foo", 1L).getId(),
+                "workspace 1 must resolve its own foo (id=2)");
+        assertEquals(3L, runtime.findActiveSkill("foo", 2L).getId(),
+                "workspace 2 must resolve its own foo (id=3), not workspace 1's");
+        // Builtin stays global.
+        assertNotNull(runtime.findActiveSkill("bar", 2L), "builtin bar must be visible in every workspace");
+    }
+
+    @Test
+    @DisplayName("unresolved (null) workspace sees only builtin + global, never a workspace skill")
+    void nullWorkspaceSeesOnlyBuiltinAndGlobal() {
+        SkillEntity builtin = entity(1L, "bar", "builtin");
+        SkillEntity fooWs1 = entity(2L, "foo", "dynamic");
+        SkillRuntimeService runtime = runtimeWith(
+                List.of(resolved(builtin, true, null), resolved(fooWs1, false, 1L)),
+                List.of(builtin, fooWs1));
+
+        assertNull(runtime.findActiveSkill("foo", null),
+                "a null execution workspace must NOT resolve any workspace-owned skill");
+        assertNotNull(runtime.findActiveSkill("bar", null),
+                "builtin stays visible even when the execution workspace is unresolved");
+    }
+
+    @Test
+    @DisplayName("getActiveSkills(workspaceId) excludes other workspaces' skills")
+    void getActiveSkillsScopedExcludesOtherWorkspace() {
+        SkillEntity builtin = entity(1L, "bar", "builtin");
+        SkillEntity fooWs1 = entity(2L, "foo", "dynamic");
+        SkillEntity bazWs2 = entity(3L, "baz", "dynamic");
+        SkillRuntimeService runtime = runtimeWith(
+                List.of(resolved(builtin, true, null), resolved(fooWs1, false, 1L), resolved(bazWs2, false, 2L)),
+                List.of(builtin, fooWs1, bazWs2));
+
+        List<Long> ids = runtime.getActiveSkills(1L).stream().map(ResolvedSkill::getId).toList();
+        assertTrue(ids.contains(1L), "builtin visible");
+        assertTrue(ids.contains(2L), "own workspace skill visible");
+        assertFalse(ids.contains(3L), "other workspace's skill must be excluded");
+    }
+
+    @Test
+    @DisplayName("matchesWorkspace: builtin/global always visible, real skill only in its own workspace")
+    void matchesWorkspaceRules() {
+        ResolvedSkill builtin = ResolvedSkill.builder().id(1L).name("b").builtin(true).build();
+        ResolvedSkill global = ResolvedSkill.builder().id(2L).name("g").workspaceId(null).build();
+        ResolvedSkill ws1 = ResolvedSkill.builder().id(3L).name("s").workspaceId(1L).build();
+
+        assertTrue(SkillRuntimeService.matchesWorkspace(builtin, 2L), "builtin visible everywhere");
+        assertTrue(SkillRuntimeService.matchesWorkspace(builtin, null), "builtin visible even for null ws");
+        assertTrue(SkillRuntimeService.matchesWorkspace(global, 2L), "null-workspace (virtual) visible everywhere");
+        assertTrue(SkillRuntimeService.matchesWorkspace(ws1, 1L), "own workspace matches");
+        assertFalse(SkillRuntimeService.matchesWorkspace(ws1, 2L), "other workspace excluded");
+        assertFalse(SkillRuntimeService.matchesWorkspace(ws1, null), "unresolved workspace never sees a real skill");
+    }
+
+    private static SkillEntity entity(Long id, String name, String type) {
+        SkillEntity entity = new SkillEntity();
+        entity.setId(id);
+        entity.setName(name);
+        entity.setDescription("Description for " + name);
+        entity.setSkillType(type);
+        entity.setEnabled(true);
+        entity.setSecurityScanStatus("PASSED");
+        return entity;
+    }
+
+    private static ResolvedSkill resolved(SkillEntity entity, boolean builtin, Long workspaceId) {
+        return ResolvedSkill.builder()
+                .id(entity.getId())
+                .name(entity.getName())
+                .description(entity.getDescription())
+                .enabled(true)
+                .runtimeAvailable(true)
+                .dependencyReady(true)
+                .securityBlocked(false)
+                .builtin(builtin)
+                .workspaceId(workspaceId)
+                .build();
+    }
+}