diff --git a/pyproject.toml b/pyproject.toml
index 60d4c53..c87342d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,8 +29,7 @@ ignore_missing_imports = true
 
 [[tool.mypy.overrides]]
 module = "easy_tdx.MyTT"
-disallow_untyped_defs = false
-disallow_untyped_calls = false
+# Type stubs provided via MyTT.pyi — keep strict checks enabled
 
 [tool.ruff]
 target-version = "py310"
diff --git a/src/easy_tdx/MyTT.pyi b/src/easy_tdx/MyTT.pyi
new file mode 100644
index 0000000..6b2925f
--- /dev/null
+++ b/src/easy_tdx/MyTT.pyi
@@ -0,0 +1,105 @@
+"""Type stubs for MyTT technical indicator library.
+
+Provides type annotations for the MyTT functions used in easy_tdx.
+All indicator functions accept numpy arrays and return numpy arrays.
+"""
+from __future__ import annotations
+
+import numpy as np
+import numpy.typing as npt
+
+NDArray = npt.NDArray[np.float64]
+
+# ── Moving Averages ──────────────────────────────────────────────────────────
+
+def MA(S: npt.ArrayLike, N: int) -> NDArray: ...
+def EMA(S: npt.ArrayLike, N: int) -> NDArray: ...
+def SMA(S: npt.ArrayLike, N: int, M: int = ...) -> NDArray: ...
+def WMA(S: npt.ArrayLike, N: int) -> NDArray: ...
+def DMA(S: npt.ArrayLike, A: npt.ArrayLike) -> NDArray: ...
+
+# ── MACD / Momentum ─────────────────────────────────────────────────────────
+
+def MACD(
+    CLOSE: npt.ArrayLike,
+    LOW: npt.ArrayLike,
+    HIGH: npt.ArrayLike,
+    SHORT: int = ...,
+    LONG: int = ...,
+    M: int = ...,
+) -> tuple[NDArray, NDArray, NDArray]: ...
+
+def RSI(CLOSE: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def MTM(CLOSE: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def ROC(CLOSE: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def OBV(CLOSE: npt.ArrayLike, VOL: npt.ArrayLike) -> NDArray: ...
+
+# ── Bollinger / Envelope ────────────────────────────────────────────────────
+
+def BOLL(
+    CLOSE: npt.ArrayLike,
+    N: int = ...,
+    P: float = ...,
+) -> tuple[NDArray, NDArray, NDArray]: ...
+
+# ── Trend Indicators ────────────────────────────────────────────────────────
+
+def ATR(CLOSE: npt.ArrayLike, HIGH: npt.ArrayLike, LOW: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def DMI(
+    CLOSE: npt.ArrayLike,
+    HIGH: npt.ArrayLike,
+    LOW: npt.ArrayLike,
+    M: int = ...,
+    N: int = ...,
+) -> tuple[NDArray, NDArray, NDArray, NDArray]: ...
+
+def KDJ(
+    CLOSE: npt.ArrayLike,
+    HIGH: npt.ArrayLike,
+    LOW: npt.ArrayLike,
+    N: int = ...,
+    M1: int = ...,
+    M2: int = ...,
+) -> tuple[NDArray, NDArray, NDArray]: ...
+
+def WR(CLOSE: npt.ArrayLike, HIGH: npt.ArrayLike, LOW: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def CCI(CLOSE: npt.ArrayLike, HIGH: npt.ArrayLike, LOW: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def TRIX(CLOSE: npt.ArrayLike, N: int = ...) -> NDArray: ...
+
+# ── Volume Indicators ───────────────────────────────────────────────────────
+
+def VR(
+    CLOSE: npt.ArrayLike,
+    VOL: npt.ArrayLike,
+    N: int = ...,
+) -> NDArray: ...
+def MFI(CLOSE: npt.ArrayLike, HIGH: npt.ArrayLike, LOW: npt.ArrayLike, VOL: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def EMV(HIGH: npt.ArrayLike, LOW: npt.ArrayLike, VOL: npt.ArrayLike, N: int = ...) -> NDArray: ...
+
+# ── Other Indicators ────────────────────────────────────────────────────────
+
+def ASI(CLOSE: npt.ArrayLike, HIGH: npt.ArrayLike, LOW: npt.ArrayLike, OPEN: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def BBI(CLOSE: npt.ArrayLike, N1: int = ..., N2: int = ..., N3: int = ..., N4: int = ...) -> NDArray: ...
+def BIAS(CLOSE: npt.ArrayLike, N1: int = ..., N2: int = ..., N3: int = ...) -> tuple[NDArray, NDArray, NDArray]: ...
+def BIAS_SIGNAL(CLOSE: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def BRAR(OPEN: npt.ArrayLike, CLOSE: npt.ArrayLike, HIGH: npt.ArrayLike, LOW: npt.ArrayLike, N: int = ...) -> tuple[NDArray, NDArray]: ...
+def CR(HIGH: npt.ArrayLike, LOW: npt.ArrayLike, CLOSE: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def DFMA(CLOSE: npt.ArrayLike, N1: int = ..., N2: int = ...) -> tuple[NDArray, NDArray]: ...
+def DPO(CLOSE: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def EXPMA(CLOSE: npt.ArrayLike, N1: int = ..., N2: int = ...) -> tuple[NDArray, NDArray]: ...
+def KTN(CLOSE: npt.ArrayLike, HIGH: npt.ArrayLike, LOW: npt.ArrayLike, N: int = ..., M: int = ...) -> tuple[NDArray, NDArray, NDArray]: ...
+def MASS(HIGH: npt.ArrayLike, LOW: npt.ArrayLike, N1: int = ..., N2: int = ...) -> NDArray: ...
+def PSY(CLOSE: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def TAQ(CLOSE: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def XSII(CLOSE: npt.ArrayLike, HIGH: npt.ArrayLike, LOW: npt.ArrayLike, N: int = ...) -> NDArray: ...
+def ZHUOYAO(CLOSE: npt.ArrayLike, HIGH: npt.ArrayLike, LOW: npt.ArrayLike, VOL: npt.ArrayLike) -> NDArray: ...
+
+# ── Utility Functions ────────────────────────────────────────────────────────
+
+def CROSS(A: npt.ArrayLike, B: npt.ArrayLike) -> NDArray: ...
+def HHV(S: npt.ArrayLike, N: int) -> NDArray: ...
+def LLV(S: npt.ArrayLike, N: int) -> NDArray: ...
+def REF(S: npt.ArrayLike, N: int) -> NDArray: ...
+def SUM(S: npt.ArrayLike, N: int) -> NDArray: ...
+def COUNT(S: npt.ArrayLike, N: int) -> NDArray: ...
+def STD(S: npt.ArrayLike, N: int) -> NDArray: ...