diff --git a/corp_codex_pool/mcodex.py b/corp_codex_pool/mcodex.py
index 76539a1..1d26605 100644
--- a/corp_codex_pool/mcodex.py
+++ b/corp_codex_pool/mcodex.py
@@ -56,11 +56,18 @@
     "MULTICA_WORKSPACE_ID",
 )
 
+VERSION_PROBE_ARGS = {"--version", "-V"}
+
 
 class McodexError(RuntimeError):
     pass
 
 
+def is_version_probe(args: list[str]) -> bool:
+    """Return true only for the side-effect-free daemon runtime probe."""
+    return len(args) == 1 and args[0] in VERSION_PROBE_ARGS
+
+
 def mcodex_home() -> Path:
     """mcodex 自己的家目录。可用 MCODEX_HOME 覆盖。"""
     override = os.environ.get("MCODEX_HOME")
@@ -327,8 +334,12 @@ def main(argv: list[str] | None = None) -> int:
     )
 
     try:
-        updates = prepare_env(spec, settings.pool_session_url)
         real_codex = find_real_codex(mcodex_home())
+        updates = (
+            {}
+            if is_version_probe(args)
+            else prepare_env(spec, settings.pool_session_url)
+        )
     except McodexError as exc:
         print(f"mcodex: {exc}", file=sys.stderr)
         return 1
diff --git a/pyproject.toml b/pyproject.toml
index 24507af..6a00fc4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "corp-codex-pool"
-version = "0.2.0"
+version = "0.2.1"
 description = "Codex 号池与 multica 运行时的集成层：provider 注入、密钥下发、用量对账"
 requires-python = ">=3.11"
 dependencies = [
diff --git a/tests/test_mcodex.py b/tests/test_mcodex.py
index 835ca18..fccc645 100644
--- a/tests/test_mcodex.py
+++ b/tests/test_mcodex.py
@@ -11,6 +11,7 @@
     McodexError,
     find_real_codex,
     init_home,
+    is_version_probe,
     mcodex_home,
     prepare_env,
     read_key,
@@ -247,6 +248,15 @@ def test_task_mode_rejects_standalone_use(self, tmp_path, monkeypatch, spec):
             prepare_env(spec, "https://pool.example/session-key")
 
 
+class TestVersionProbe:
+    def test_only_exact_version_probe_bypasses_task_context(self):
+        assert is_version_probe(["--version"])
+        assert is_version_probe(["-V"])
+        assert not is_version_probe([])
+        assert not is_version_probe(["--version", "app-server"])
+        assert not is_version_probe(["app-server", "--version"])
+
+
 class TestRequestSessionKey:
     def test_requires_complete_task_context(self):
         with pytest.raises(McodexError, match="MULTICA_TOKEN"):