fix(McpActionExecutor): handle client call failures gracefully

Partner-Core/src/test/java/work/slhaf/partner/core/action/runner/execution/McpActionExecutorTest.java

@@ -0,0 +1,38 @@
+package work.slhaf.partner.core.action.runner.execution;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import work.slhaf.partner.core.action.entity.MetaAction;
+import work.slhaf.partner.core.action.runner.mcp.McpClientRegistry;
+
+import java.lang.reflect.Field;
+import java.util.Map;
+
+class McpActionExecutorTest {
+
+    @Test
+    void testRunReturnsFailureWhenClientThrows() {
+        McpClientRegistry clientRegistry = new McpClientRegistry();
+        clientRegistry.register("broken", buildThrowingMcpClient());
+        McpActionExecutor executor = new McpActionExecutor(clientRegistry);
+
+        MetaAction metaAction = new MetaAction("demo-tool", false, null, MetaAction.Type.MCP, "broken");
+        metaAction.getParams().putAll(Map.of("value", "demo"));
+
+        var response = executor.run(metaAction);
+
+        Assertions.assertFalse(response.isOk());
+        Assertions.assertTrue(response.getData().startsWith("MCP tool call failed:"));
+    }
+
+    private io.modelcontextprotocol.client.McpSyncClient buildThrowingMcpClient() {
+        try {
+            Field unsafeField = sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
+            unsafeField.setAccessible(true);
+            sun.misc.Unsafe unsafe = (sun.misc.Unsafe) unsafeField.get(null);
+            return (io.modelcontextprotocol.client.McpSyncClient) unsafe.allocateInstance(io.modelcontextprotocol.client.McpSyncClient.class);
+        } catch (Exception e) {
+            throw new IllegalStateException("failed to build throwing mcp client", e);
+        }
+    }
+}