diff --git a/README.md b/README.md
index a71d8ff..36cc76d 100644
--- a/README.md
+++ b/README.md
@@ -8,10 +8,69 @@
 [![API Docs](https://img.shields.io/badge/docs-API%20reference-brightgreen)](https://oddrationale.github.io/deepagents-azure-blob-backend)
 [![autofix.ci](https://img.shields.io/badge/autofix.ci-enabled-success)](https://github.com/oddrationale/deepagents-azure-blob-backend/actions/workflows/autofix.ci.yml)
 
+> [!WARNING]
+> **This package is deprecated and no longer maintained.**
+>
+> Its Azure Blob Storage backend now ships first-party in [`langchain-azure-storage`](https://pypi.org/project/langchain-azure-storage/), maintained by LangChain and Microsoft in [langchain-ai/langchain-azure](https://github.com/langchain-ai/langchain-azure):
+>
+> ```bash
+> pip install "langchain-azure-storage[deepagents]"
+> ```
+>
+> The constructor API changed during upstream review, so this is not a drop-in swap — see [Migrating to langchain-azure-storage](#migrating-to-langchain-azure-storage) below.
+>
+> Existing releases stay installable and nothing is yanked, but `0.5.0` is the last one. It supports only `deepagents<0.7.0`; for `deepagents>=0.7.1`, use `langchain-azure-storage`.
+
 Azure Blob Storage filesystem backend for [LangChain Deep Agents](https://github.com/langchain-ai/deepagents).
 
 Deep Agents exposes a `BackendProtocol` — a pluggable interface for file operations (`read`, `write`, `edit`, `ls`, `glob`, `grep`) that the agent uses as its virtual filesystem. This package provides an Azure Blob Storage implementation of that interface.
 
+## Migrating to langchain-azure-storage
+
+```bash
+pip uninstall deepagents-azure-blob-backend
+pip install "langchain-azure-storage[deepagents]"
+```
+
+The successor drops the `AzureBlobConfig` dataclass and takes its arguments directly on the constructor. Credentials are Azure SDK credential objects rather than raw key or token strings:
+
+```python
+# Before
+from deepagents_azure_blob_backend import AzureBlobBackend, AzureBlobConfig
+
+backend = AzureBlobBackend(
+    AzureBlobConfig(
+        account_url="https://<account>.blob.core.windows.net",
+        container_name="agent-workspace",
+        prefix="session-001/",
+    )
+)
+
+# After
+from langchain_azure_storage.deepagents import AzureBlobBackend
+
+backend = AzureBlobBackend(
+    "https://<account>.blob.core.windows.net",
+    "agent-workspace",
+    prefix="session-001/",
+)
+```
+
+| `AzureBlobConfig` field | Replacement |
+|---|---|
+| `account_url`, `container_name` | Positional arguments to `AzureBlobBackend(...)` |
+| `prefix` | Keyword argument `prefix=` |
+| `credential=<azure credential>` | Keyword argument `credential=` (`TokenCredential`, `AsyncTokenCredential`, or `AzureSasCredential`) |
+| `connection_string="..."` | `AzureBlobBackend.from_connection_string(connection_string, container_name, prefix=...)` |
+| `sas_token="sv=..."` | `credential=AzureSasCredential("sv=...")` (from `azure.core.credentials`) |
+| `account_key="..."` | No direct equivalent — use `from_connection_string` (a connection string carries `AccountKey`) or a SAS credential |
+| *(omit all credentials)* | Unchanged — `DefaultAzureCredential` is still the default |
+| `max_concurrency`, `encoding`, `api_version` | Not exposed; the successor manages concurrency and encoding internally |
+
+The successor also requires `deepagents>=0.7.1`, where `write` overwrites an existing file instead of erroring and `delete`/`adelete` are part of `BackendProtocol`. Python 3.11+ is required for the `deepagents` extra.
+
+Further reading: [backend integrations](https://docs.langchain.com/oss/python/integrations/backends) · [design proposal and behavior notes](https://github.com/langchain-ai/langchain-azure/blob/main/libs/azure-storage/proposals/deepagents_backend.md) · [upstream PR](https://github.com/langchain-ai/langchain-azure/pull/783)
+
 ## Installation
 
 ```bash
@@ -24,7 +83,7 @@ Or with [uv](https://docs.astral.sh/uv/):
 uv add deepagents-azure-blob-backend
 ```
 
-This package requires `deepagents>=0.6.1`, where `BackendProtocol` exposes structured `ls`, `glob`, and `grep` result types.
+This package requires `deepagents>=0.6.1,<0.7.0`, where `BackendProtocol` exposes structured `ls`, `glob`, and `grep` result types. It does not support the `BackendProtocol` changes in `deepagents` 0.7.0 — see [Migrating to langchain-azure-storage](#migrating-to-langchain-azure-storage).
 
 ## Quick Start
 
diff --git a/pyproject.toml b/pyproject.toml
index 59a0985..934f85d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,13 +1,13 @@
 [project]
 name = "deepagents-azure-blob-backend"
 version = "0.4.1"
-description = "Azure Blob Storage filesystem backend for LangChain Deep Agents"
+description = "Deprecated — use langchain-azure-storage[deepagents]. Azure Blob Storage filesystem backend for LangChain Deep Agents"
 readme = "README.md"
 requires-python = ">=3.11"
 license = "MIT"
 keywords = ["langchain", "deepagents", "azure", "blob-storage", "agent", "backend", "llm"]
 classifiers = [
-    "Development Status :: 3 - Alpha",
+    "Development Status :: 7 - Inactive",
     "Intended Audience :: Developers",
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",
@@ -17,7 +17,11 @@ classifiers = [
     "Topic :: Software Development :: Libraries",
 ]
 dependencies = [
-    "deepagents>=0.6.1",
+    # Do not raise this ceiling. deepagents 0.7.0 changed `BackendProtocol` in ways this
+    # backend does not implement (write overwrites instead of erroring, `delete`/`adelete`
+    # is required, `GrepResult.truncated`). This package is deprecated and will not be
+    # updated for it — use langchain-azure-storage[deepagents] on deepagents >= 0.7.1.
+    "deepagents>=0.6.1,<0.7.0",
     "azure-storage-blob[aio]>=12.0.0",
     "azure-identity>=1.0.0",
     "wcmatch",
@@ -31,6 +35,7 @@ dependencies = [
 ]
 
 [project.urls]
+"Successor package" = "https://pypi.org/project/langchain-azure-storage/"
 Homepage = "https://github.com/oddrationale/deepagents-azure-blob-backend"
 Documentation = "https://oddrationale.github.io/deepagents-azure-blob-backend"
 Repository = "https://github.com/oddrationale/deepagents-azure-blob-backend"
diff --git a/src/deepagents_azure_blob_backend/__init__.py b/src/deepagents_azure_blob_backend/__init__.py
index ae52790..02229e2 100644
--- a/src/deepagents_azure_blob_backend/__init__.py
+++ b/src/deepagents_azure_blob_backend/__init__.py
@@ -1,5 +1,17 @@
 """Azure Blob Storage filesystem backend for [LangChain Deep Agents](https://github.com/langchain-ai/deepagents).
 
+> **Deprecated since 0.5.0.** This package is no longer maintained. Its backend now ships
+> first-party as `AzureBlobBackend` in
+> [`langchain-azure-storage`](https://pypi.org/project/langchain-azure-storage/):
+>
+> ```bash
+> pip install "langchain-azure-storage[deepagents]"
+> ```
+>
+> The constructor API changed, so this is not a drop-in swap — see the
+> [migration guide](https://github.com/oddrationale/deepagents-azure-blob-backend#migrating-to-langchain-azure-storage).
+> Released versions stay installable, but this package supports only `deepagents<0.7.0`.
+
 This package provides `AzureBlobBackend`, an implementation of the Deep Agents
 `BackendProtocol` that uses Azure Blob Storage as its virtual filesystem.
 
@@ -31,7 +43,20 @@
 See `AzureBlobConfig` for full details and `AzureBlobBackend` for the API.
 """
 
+import warnings
+
 from .backend import AzureBlobBackend
 from .config import AzureBlobConfig
 
+_DEPRECATION_MESSAGE = (
+    "deepagents-azure-blob-backend is deprecated and will receive no further updates. "
+    "Its Azure Blob Storage backend now ships first-party as "
+    "langchain_azure_storage.deepagents.AzureBlobBackend — install "
+    "'langchain-azure-storage[deepagents]'. The constructor API changed, so this is not a "
+    "drop-in swap: see "
+    "https://github.com/oddrationale/deepagents-azure-blob-backend#migrating-to-langchain-azure-storage"
+)
+
+warnings.warn(_DEPRECATION_MESSAGE, DeprecationWarning, stacklevel=2)
+
 __all__ = ["AzureBlobBackend", "AzureBlobConfig"]
diff --git a/tests/unit_tests/test_deprecation.py b/tests/unit_tests/test_deprecation.py
new file mode 100644
index 0000000..ca5345f
--- /dev/null
+++ b/tests/unit_tests/test_deprecation.py
@@ -0,0 +1,21 @@
+"""Unit tests for the package-level deprecation notice."""
+
+from __future__ import annotations
+
+import importlib
+
+import pytest
+
+import deepagents_azure_blob_backend
+
+
+class TestDeprecationWarning:
+    def test_import_warns(self):
+        # The warning fires at module exec time, so a plain import is a no-op once
+        # another test has already imported the package.
+        with pytest.warns(DeprecationWarning, match="langchain-azure-storage"):
+            importlib.reload(deepagents_azure_blob_backend)
+
+    def test_reload_still_exports_public_api(self):
+        module = importlib.reload(deepagents_azure_blob_backend)
+        assert module.__all__ == ["AzureBlobBackend", "AzureBlobConfig"]
diff --git a/uv.lock b/uv.lock
index a1a9c52..02c4ee8 100644
--- a/uv.lock
+++ b/uv.lock
@@ -628,7 +628,7 @@ requires-dist = [
     { name = "azure-identity", specifier = ">=1.0.0" },
     { name = "azure-storage-blob", extras = ["aio"], specifier = ">=12.0.0" },
     { name = "cryptography", specifier = ">=46.0.7" },
-    { name = "deepagents", specifier = ">=0.6.1" },
+    { name = "deepagents", specifier = ">=0.6.1,<0.7.0" },
     { name = "langchain-core", specifier = ">=1.2.28" },
     { name = "langsmith", specifier = ">=0.7.31" },
     { name = "pyjwt", specifier = ">=2.12.0" },