fix: lazy bedrock import and BYO Anthropic token counting

.github/workflows/ci.yml

@@ -12,6 +12,9 @@ on:
       - "uv.lock"
       - ".python-version"
 
+permissions:
+  contents: read
+
 jobs:
   type_check:
     name: Type Check and Lint
@@ -41,6 +44,31 @@ jobs:
       - name: Pyright
         run: uv run pyright .
 
+  import_without_extras:
+    name: Import Without Extras
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+        with:
+          version: "0.9.27"
+          enable-cache: true
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version-file: ".python-version"
+
+      - name: Install without extras
+        run: uv sync --no-dev --package uipath-langchain-client
+
+      - name: Import packages
+        run: |
+          uv run --no-sync python -c "import uipath.llm_client"
+          uv run --no-sync python -c "import uipath_langchain_client"
+
   test:
     name: Test
     runs-on: ubuntu-latest

packages/uipath_langchain_client/CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to `uipath_langchain_client` will be documented in this file.
 
+## [1.16.1] - 2026-07-03
+
+### Fixed
+- `import uipath_langchain_client` no longer requires the `bedrock` extra (regression in 1.15.1).
+
 ## [1.16.0] - 2026-07-03
 
 ### Changed

packages/uipath_langchain_client/src/uipath_langchain_client/__version__.py

@@ -1,3 +1,3 @@
 __title__ = "UiPath LangChain Client"
 __description__ = "A Python client for interacting with UiPath's LLM services via LangChain."
-__version__ = "1.16.0"
+__version__ = "1.16.1"

packages/uipath_langchain_client/src/uipath_langchain_client/factory.py

@@ -26,9 +26,6 @@
     UiPathBaseChatModel,
     UiPathBaseEmbeddings,
 )
-from uipath_langchain_client.clients.bedrock.model_resolution import (
-    apply_backing_model_detection_hints,
-)
 from uipath_langchain_client.settings import (
     API_FLAVOR_TO_VENDOR_TYPE,
     BYOM_TO_ROUTING_FLAVOR,
@@ -221,6 +218,10 @@ def get_chat_model(
                     **model_kwargs,
                 )
 
+            from uipath_langchain_client.clients.bedrock.model_resolution import (
+                apply_backing_model_detection_hints,
+            )
+
             apply_backing_model_detection_hints(model_kwargs, model_info)
 
             if api_flavor == ApiFlavor.INVOKE:

tests/langchain/features/test_optional_extras.py

@@ -0,0 +1,56 @@
+"""The package must import without optional provider extras installed."""
+
+import subprocess
+import sys
+
+_OPTIONAL_MODULES = [
+    "anthropic",
+    "google.genai",
+    "langchain_anthropic",
+    "langchain_aws",
+    "langchain_azure_ai",
+    "langchain_fireworks",
+    "langchain_google_genai",
+    "langchain_google_vertexai",
+    "langchain_litellm",
+    "langchain_openai",
+    "litellm",
+    "openai",
+]
+
+_IMPORT_WITH_BLOCKED_EXTRAS = """
+import sys
+
+blocked = set(sys.argv[1:])
+
+
+class _BlockOptionalDeps:
+    def find_spec(self, name, path=None, target=None):
+        if any(name == module or name.startswith(module + ".") for module in blocked):
+            raise ImportError(f"blocked optional dependency: {name}")
+        return None
+
+
+sys.meta_path.insert(0, _BlockOptionalDeps())
+
+import uipath_langchain_client
+
+providers = [
+    name
+    for name in sys.modules
+    if name.startswith("uipath_langchain_client.clients.")
+    and not name.startswith("uipath_langchain_client.clients.normalized")
+]
+assert not providers, providers
+print("OK")
+"""
+
+
+def test_package_imports_without_optional_extras():
+    result = subprocess.run(
+        [sys.executable, "-c", _IMPORT_WITH_BLOCKED_EXTRAS, *_OPTIONAL_MODULES],
+        capture_output=True,
+        text=True,
+    )
+    assert result.returncode == 0, result.stderr
+    assert result.stdout.strip() == "OK"