diff --git a/azure-functions-durable/CHANGELOG.md b/azure-functions-durable/CHANGELOG.md
index e9c022e..fea8d4d 100644
--- a/azure-functions-durable/CHANGELOG.md
+++ b/azure-functions-durable/CHANGELOG.md
@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ADDED
 
+- Added PEP 561 type information so strict type checkers recognize
+`azure.durable_functions` as a typed package.
 - Added `azure.durable_functions.testing.execute_entity()` for unit testing
 function-style and class-based entities without a Functions host or Durable Task
 backend. The helper returns the operation result, resulting state, and typed
diff --git a/azure-functions-durable/azure/durable_functions/py.typed b/azure-functions-durable/azure/durable_functions/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/azure-functions-durable/pyproject.toml b/azure-functions-durable/pyproject.toml
index fb675b4..62698a0 100644
--- a/azure-functions-durable/pyproject.toml
+++ b/azure-functions-durable/pyproject.toml
@@ -39,5 +39,8 @@ changelog = "https://github.com/microsoft/durabletask-python/blob/main/azure-fun
 [tool.setuptools.packages.find]
 include = ["azure.durable_functions", "azure.durable_functions.*"]
 
+[tool.setuptools.package-data]
+"azure.durable_functions" = ["py.typed"]
+
 [tool.pytest.ini_options]
 minversion = "6.0"
diff --git a/noxfile.py b/noxfile.py
index 075c71c..29ce7de 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -27,8 +27,10 @@
 import shutil
 import socket
 import subprocess
+import tarfile
 import time
 import uuid
+import zipfile
 from pathlib import Path
 from typing import Sequence
 
@@ -311,16 +313,65 @@ def typecheck_core(session: nox.Session) -> None:
 
 @nox.session(python=["3.13"])
 def typecheck_functions(session: nox.Session) -> None:
-    """Run strict pyright checks for azure-functions-durable."""
+    """Run strict pyright checks for azure-functions-durable and its wheel."""
     session.install("-r", "requirements.txt")
-    _install_packages(session, editable=True)
-    session.install("pyright")
+    session.install("-e", str(REPO_ROOT))
+    session.install("build", "pyright")
+    artifact_dir = Path(session.create_tmp()) / "dist"
+    if artifact_dir.exists():
+        shutil.rmtree(artifact_dir)
+    session.run(
+        "python",
+        "-m",
+        "build",
+        "--outdir",
+        str(artifact_dir),
+        str(AZURE_FUNCTIONS_DURABLE),
+    )
+
+    wheels = list(artifact_dir.glob("azure_functions_durable-*.whl"))
+    sdists = list(artifact_dir.glob("azure_functions_durable-*.tar.gz"))
+    if len(wheels) != 1 or len(sdists) != 1:
+        session.error("Expected exactly one wheel and one source distribution")
+    wheel = wheels[0]
+    sdist = sdists[0]
+    marker = "azure/durable_functions/py.typed"
+    with zipfile.ZipFile(wheel) as archive:
+        if marker not in archive.namelist():
+            session.error(f"{marker} is missing from {wheel.name}")
+    with tarfile.open(sdist, "r:gz") as archive:
+        if not any(name.endswith(f"/{marker}") for name in archive.getnames()):
+            session.error(f"{marker} is missing from {sdist.name}")
+
+    session.install(str(wheel))
+    session.run(
+        "python",
+        "-m",
+        "pip",
+        "install",
+        "--force-reinstall",
+        "--no-deps",
+        str(wheel),
+    )
     session.run(
         "pyright",
         "-p",
         "azure-functions-durable/pyrightconfig.json",
         *session.posargs,
     )
+    python_path = session.run(
+        "python",
+        "-c",
+        "import sys; print(sys.executable)",
+        silent=True,
+    ).strip()
+    session.run(
+        "pyright",
+        "--pythonpath",
+        python_path,
+        "-p",
+        "tests/azure-functions-durable/typing/pyrightconfig.json",
+    )
 
 
 @nox.session(python=PYTHON_VERSIONS)
diff --git a/tests/azure-functions-durable/typing/import_package.py b/tests/azure-functions-durable/typing/import_package.py
new file mode 100644
index 0000000..3beb135
--- /dev/null
+++ b/tests/azure-functions-durable/typing/import_package.py
@@ -0,0 +1,8 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+import azure.durable_functions as df
+
+
+def create_app() -> df.DFApp:
+    return df.DFApp()
diff --git a/tests/azure-functions-durable/typing/pyrightconfig.json b/tests/azure-functions-durable/typing/pyrightconfig.json
new file mode 100644
index 0000000..68700dd
--- /dev/null
+++ b/tests/azure-functions-durable/typing/pyrightconfig.json
@@ -0,0 +1,7 @@
+{
+  "include": [
+    "import_package.py"
+  ],
+  "pythonVersion": "3.13",
+  "typeCheckingMode": "strict"
+}