diff --git a/mateclaw-server/src/test/java/vip/mate/memory/search/SessionSearchIsolationTest.java b/mateclaw-server/src/test/java/vip/mate/memory/search/SessionSearchIsolationTest.java
new file mode 100644
index 00000000..74f0d576
--- /dev/null
+++ b/mateclaw-server/src/test/java/vip/mate/memory/search/SessionSearchIsolationTest.java
@@ -0,0 +1,98 @@
+package vip.mate.memory.search;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.test.context.TestPropertySource;
+import vip.mate.MateClawApplication;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Isolation regression test for {@link SessionSearchService}.
+ * <p>
+ * Concurrent sessions of the same agent must not leak into each other's
+ * session_search results: a still-running sibling conversation
+ * ({@code stream_status='running'}) and the caller's own current conversation
+ * are both excluded from {@code listRecent} and {@code search}. Guards the fix
+ * for cross-conversation memory contamination.
+ */
+@SpringBootTest(
+        classes = MateClawApplication.class,
+        webEnvironment = SpringBootTest.WebEnvironment.NONE
+)
+@TestPropertySource(properties = {
+        "spring.datasource.url=jdbc:h2:mem:session_search_iso_${random.uuid};MODE=MySQL;DATABASE_TO_LOWER=TRUE;CASE_INSENSITIVE_IDENTIFIERS=TRUE;DB_CLOSE_DELAY=-1",
+        "spring.ai.dashscope.api-key=test-key",
+        "spring.main.web-application-type=none",
+        "mateclaw.jwt.secret=session-search-iso-secret-0123456789"
+})
+class SessionSearchIsolationTest {
+
+    private static final long AGENT_ID = 9_458_001L;
+    private static final String CONV_CURRENT = "conv-current-458";
+    private static final String CONV_COMPLETED = "conv-completed-458";
+    private static final String CONV_RUNNING = "conv-running-458";
+
+    @Autowired private SessionSearchService service;
+    @Autowired private JdbcTemplate jdbc;
+
+    @BeforeEach
+    void setUp() {
+        jdbc.update("DELETE FROM mate_message WHERE conversation_id IN (?, ?, ?)",
+                CONV_CURRENT, CONV_COMPLETED, CONV_RUNNING);
+        jdbc.update("DELETE FROM mate_conversation WHERE agent_id = ?", AGENT_ID);
+
+        // Three sessions of the same agent: the caller's current one, a finished
+        // sibling, and a still-running sibling.
+        insertConversation(9_458_101L, CONV_CURRENT, "current chat", "idle");
+        insertConversation(9_458_102L, CONV_COMPLETED, "yesterday nanjing weather", "idle");
+        insertConversation(9_458_103L, CONV_RUNNING, "sibling running nanjing task", "running");
+
+        insertMessage(9_458_201L, CONV_CURRENT, "user", "what is the weather");
+        insertMessage(9_458_202L, CONV_COMPLETED, "assistant", "Nanjing is rainy today");
+        insertMessage(9_458_203L, CONV_RUNNING, "assistant", "Nanjing forecast in progress");
+    }
+
+    private void insertConversation(long id, String convId, String title, String streamStatus) {
+        jdbc.update("INSERT INTO mate_conversation (id, conversation_id, title, agent_id, message_count, "
+                        + "last_active_time, stream_status, workspace_id, create_time, update_time, deleted) "
+                        + "VALUES (?, ?, ?, ?, 1, CURRENT_TIMESTAMP, ?, 1, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, 0)",
+                id, convId, title, AGENT_ID, streamStatus);
+    }
+
+    private void insertMessage(long id, String convId, String role, String content) {
+        jdbc.update("INSERT INTO mate_message (id, conversation_id, role, content, status, "
+                        + "create_time, update_time, deleted) "
+                        + "VALUES (?, ?, ?, ?, 'completed', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, 0)",
+                id, convId, role, content);
+    }
+
+    @Test
+    @DisplayName("listRecent excludes the running sibling and the current conversation")
+    void listRecentExcludesRunningAndCurrent() {
+        List<Map<String, Object>> recent = service.listRecent(AGENT_ID, CONV_CURRENT, 50);
+        List<String> ids = recent.stream().map(r -> (String) r.get("conversationId")).toList();
+
+        assertThat(ids).contains(CONV_COMPLETED);
+        assertThat(ids).doesNotContain(CONV_RUNNING);   // still-running sibling must not leak
+        assertThat(ids).doesNotContain(CONV_CURRENT);   // caller's own conversation excluded
+    }
+
+    @Test
+    @DisplayName("search excludes the running sibling and the current conversation")
+    void searchExcludesRunningAndCurrent() {
+        List<SessionSearchResult> results = service.search(AGENT_ID, CONV_CURRENT, "Nanjing", 50);
+        List<String> ids = results.stream().map(SessionSearchResult::conversationId).toList();
+
+        assertThat(ids).contains(CONV_COMPLETED);
+        assertThat(ids).doesNotContain(CONV_RUNNING);   // running sibling's match filtered out
+        assertThat(ids).doesNotContain(CONV_CURRENT);
+    }
+}