diff --git a/loopx/capabilities/native_chat/antigravity_adapter.py b/loopx/capabilities/native_chat/antigravity_adapter.py
index d637aa2f98..f6784f3c4f 100644
--- a/loopx/capabilities/native_chat/antigravity_adapter.py
+++ b/loopx/capabilities/native_chat/antigravity_adapter.py
@@ -178,6 +178,8 @@ def discover_antigravity_language_server(
         ps_out = subprocess.check_output(
             ["ps", "-u", str(os.getuid()), "-o", "pid=,command="],
             text=True,
+            encoding="utf-8",
+            errors="replace",
             stderr=subprocess.DEVNULL,
             timeout=3.0,
         )
@@ -206,6 +208,8 @@ def discover_antigravity_language_server(
             lsof_out = subprocess.check_output(
                 ["lsof", "-nP", "-a", "-p", str(pid), "-iTCP", "-sTCP:LISTEN"],
                 text=True,
+                encoding="utf-8",
+                errors="replace",
                 stderr=subprocess.DEVNULL,
                 timeout=max(0.1, deadline - time.monotonic()),
             )
diff --git a/tests/test_antigravity_steward_adapter.py b/tests/test_antigravity_steward_adapter.py
index 28ba9dc8f2..6e6eec480c 100644
--- a/tests/test_antigravity_steward_adapter.py
+++ b/tests/test_antigravity_steward_adapter.py
@@ -6,6 +6,8 @@
 from datetime import datetime, timezone
 from copy import deepcopy
 import json
+import subprocess
+import sys
 import threading
 import time
 from types import SimpleNamespace
@@ -221,6 +223,46 @@ def adapter_for(tmp_path, **kwargs):
     return AntigravityAdapter.start(work_dir=tmp_path, objective="Act as LoopX Steward.", **kwargs)
 
 
+@pytest.mark.parametrize(("unicode_source", "malformed"), [("ps", False), ("lsof", False), ("ps", True), ("lsof", True)])
+def test_process_discovery_decodes_utf8_before_verifying_the_local_endpoint(
+    monkeypatch, language_server, unicode_source, malformed,
+):
+    from loopx.capabilities.native_chat import antigravity_adapter as provider
+
+    real_check_output = subprocess.check_output
+    calls = []
+    port = language_server["url"].rsplit(":", 1)[1]
+    outputs = {
+        "ps": "123 /Applications/Antigravity.app/language_server --csrf_token synthetic-csrf-token\n",
+        "lsof": f"language_server 123 user 10u IPv4 0 TCP 127.0.0.1:{port} (LISTEN)\n",
+    }
+    outputs[unicode_source] = outputs[unicode_source].replace("language_server", "中文🚀/language_server", 1)
+    monkeypatch.setattr(subprocess, "_text_encoding", lambda: "gbk")
+    # The process/port discovery is POSIX-owned; simulate its listings on
+    # Windows while retaining actual child pipes and the loopback HTTP owner.
+    monkeypatch.setattr(provider.os, "getuid", lambda: 501, raising=False)
+
+    def listing(command, **kwargs):
+        calls.append(command[0])
+        output = outputs[command[0]].encode("utf-8")
+        if malformed and command[0] == unicode_source:
+            output += b"\xff\n"
+        return real_check_output(
+            [sys.executable, "-c", f"import sys; sys.stdout.buffer.write({output!r})"],
+            **kwargs,
+        )
+
+    monkeypatch.setattr(provider.subprocess, "check_output", listing)
+    discovered = provider.discover_antigravity_language_server(env={})
+    assert discovered == {
+        "url": language_server["url"], "csrf_token": "synthetic-csrf-token",
+        "pid": 123, "source": "process_discovery",
+    }
+    assert calls == ["ps", "lsof"]
+    assert [method for method, _ in language_server["calls"]] == ["GetCascadeModelConfigData"]
+    assert language_server["sent_count"] == 0
+
+
 def test_cancel_failure_cannot_replace_the_original_provider_error(tmp_path, language_server):
     from loopx.chat_agent import CodexChatAgentError