chore: sunset package (#88)

Bumps the uv group with 1 update in the /libs/experimental directory:
[urllib3](https://github.com/urllib3/urllib3).

Updates `urllib3` from 2.6.3 to 2.7.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/urllib3/urllib3/releases">urllib3's
releases</a>.</em></p>
<blockquote>
<h2>2.7.0</h2>
<h2>🚀 urllib3 is fundraising for HTTP/2 support</h2>
<p><a
href="https://sethmlarson.dev/urllib3-is-fundraising-for-http2-support">urllib3
is raising ~$40,000 USD</a> to release HTTP/2 support and ensure
long-term sustainable maintenance of the project after a sharp decline
in financial support. If your company or organization uses Python and
would benefit from HTTP/2 support in Requests, pip, cloud SDKs, and
thousands of other projects <a
href="https://opencollective.com/urllib3">please consider contributing
financially</a> to ensure HTTP/2 support is developed sustainably and
maintained for the long-haul.</p>
<p>Thank you for your support.</p>
<h2>Security</h2>
<p>Addressed high-severity security issues. Impact was limited to
specific use cases detailed in the accompanying advisories; overall user
exposure was estimated to be marginal.</p>
<ul>
<li>
<p>Decompression-bomb safeguards of the streaming API were bypassed:</p>
<ol>
<li>When <code>HTTPResponse.drain_conn()</code> was called after the
response had been read and decompressed partially. (Reported by <a
href="https://github.com/Cycloctane"><code>@​Cycloctane</code></a>)</li>
<li>During the second <code>HTTPResponse.read(amt=N)</code> or
<code>HTTPResponse.stream(amt=N)</code> call when the response was
decompressed using the official <a
href="https://pypi.org/project/brotli/">Brotli</a> library. (Reported by
<a
href="https://github.com/kimkou2024"><code>@​kimkou2024</code></a>)</li>
</ol>
<p>See GHSA-mf9v-mfxr-j63j for details.</p>
</li>
<li>
<p>HTTP pools created using
<code>ProxyManager.connection_from_url</code> did not strip sensitive
headers specified in <code>Retry.remove_headers_on_redirect</code> when
redirecting to a different host. (GHSA-qccp-gfcp-xxvc reported by <a
href="https://github.com/christos-spearbit"><code>@​christos-spearbit</code></a>)</p>
</li>
</ul>
<h2>Deprecations and Removals</h2>
<ul>
<li>Used <code>FutureWarning</code> instead of
<code>DeprecationWarning</code> for better visibility of existing
deprecation notices. Rescheduled the removal of deprecated features to
version 3.0. (<a
href="https://redirect.github.com/urllib3/urllib3/issues/3763">urllib3/urllib3#3763</a>)</li>
<li>Removed support for end-of-life Python 3.9. (<a
href="https://redirect.github.com/urllib3/urllib3/issues/3720">urllib3/urllib3#3720</a>)</li>
<li>Removed support for end-of-life PyPy3.10. (<a
href="https://redirect.github.com/urllib3/urllib3/issues/4979">urllib3/urllib3#4979</a>)</li>
<li>Bumped the minimum supported pyOpenSSL version to 19.0.0. (<a
href="https://redirect.github.com/urllib3/urllib3/issues/3777">urllib3/urllib3#3777</a>)</li>
</ul>
<h2>Bugfixes</h2>
<ul>
<li>Fixed a bug where <code>HTTPResponse.read(amt=None)</code> was
ignoring decompressed data buffered from previous partial reads. (<a
href="https://redirect.github.com/urllib3/urllib3/issues/3636">urllib3/urllib3#3636</a>)</li>
<li>Fixed a bug where <code>HTTPResponse.read()</code> could cache only
part of the response after a partial read when
<code>cache_content=True</code>. (<a
href="https://redirect.github.com/urllib3/urllib3/issues/4967">urllib3/urllib3#4967</a>)</li>
<li>Fixed <code>HTTPResponse.stream()</code> and
<code>HTTPResponse.read_chunked()</code> to handle <code>amt=0</code>.
(<a
href="https://redirect.github.com/urllib3/urllib3/issues/3793">urllib3/urllib3#3793</a>)</li>
<li>Updated <code>_TYPE_BODY</code> type alias to include missing
<code>Iterable[str]</code>, matching the documented and runtime behavior
of chunked request bodies. (<a
href="https://redirect.github.com/urllib3/urllib3/issues/3798">urllib3/urllib3#3798</a>)</li>
<li>Fixed <code>LocationParseError</code> when paths resembling
schemeless URIs were passed to
<code>HTTPConnectionPool.urlopen()</code>. (<a
href="https://redirect.github.com/urllib3/urllib3/issues/3352">urllib3/urllib3#3352</a>)</li>
<li>Fixed <code>BaseHTTPResponse.readinto()</code> type annotation to
accept <code>memoryview</code> in addition to <code>bytearray</code>,
matching the <code>io.RawIOBase.readinto</code> contract and enabling
use with <code>io.BufferedReader</code> without type errors. (<a
href="https://redirect.github.com/urllib3/urllib3/issues/3764">urllib3/urllib3#3764</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/urllib3/urllib3/blob/main/CHANGES.rst">urllib3's
changelog</a>.</em></p>
<blockquote>
<h1>2.7.0 (2026-05-07)</h1>
<h2>Security</h2>
<p>Addressed high-severity security issues.
Impact was limited to specific use cases detailed in the accompanying
advisories; overall user exposure was estimated to be marginal.</p>
<ul>
<li>
<p>Decompression-bomb safeguards of the streaming API were bypassed:</p>
<ol>
<li>When <code>HTTPResponse.drain_conn()</code> was called after the
response had been
read and decompressed partially.</li>
<li>During the second <code>HTTPResponse.read(amt=N)</code> or
<code>HTTPResponse.stream(amt=N)</code> call when the response was
decompressed
using the official <code>Brotli
&lt;https://pypi.org/project/brotli/&gt;</code>__ library.</li>
</ol>
<p>See <code>GHSA-mf9v-mfxr-j63j
&lt;https://github.com/urllib3/urllib3/security/advisories/GHSA-mf9v-mfxr-j63j&gt;</code>__
for details.</p>
</li>
<li>
<p>HTTP pools created using
<code>ProxyManager.connection_from_url</code> did not strip
sensitive headers specified in
<code>Retry.remove_headers_on_redirect</code> when
redirecting to a different host.
(<code>GHSA-qccp-gfcp-xxvc
&lt;https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc&gt;</code>__)</p>
</li>
</ul>
<h2>Deprecations and Removals</h2>
<ul>
<li>Used <code>FutureWarning</code> instead of
<code>DeprecationWarning</code> for better
visibility of existing deprecation notices. Rescheduled the removal of
deprecated features to version 3.0.
(<code>[#3763](https://github.com/urllib3/urllib3/issues/3763)
&lt;https://github.com/urllib3/urllib3/issues/3763&gt;</code>__)</li>
<li>Removed support for end-of-life Python 3.9.
(<code>[#3720](https://github.com/urllib3/urllib3/issues/3720)
&lt;https://github.com/urllib3/urllib3/issues/3720&gt;</code>__)</li>
<li>Removed support for end-of-life PyPy3.10.
(<code>[#4979](https://github.com/urllib3/urllib3/issues/4979)
&lt;https://github.com/urllib3/urllib3/issues/4979&gt;</code>__)</li>
<li>Bumped the minimum supported pyOpenSSL version to 19.0.0.
(<code>[#3777](https://github.com/urllib3/urllib3/issues/3777)
&lt;https://github.com/urllib3/urllib3/issues/3777&gt;</code>__)</li>
</ul>
<h2>Bugfixes</h2>
<ul>
<li>Fixed a bug where <code>HTTPResponse.read(amt=None)</code> was
ignoring decompressed
data buffered from previous partial reads.
(<code>[#3636](https://github.com/urllib3/urllib3/issues/3636)
&lt;https://github.com/urllib3/urllib3/issues/3636&gt;</code>__)</li>
<li>Fixed a bug where <code>HTTPResponse.read()</code> could cache only
part of the
response after a partial read when <code>cache_content=True</code>.</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/urllib3/urllib3/commit/9a950b92d999f906b6020bb2d1076ee56cddd5d2"><code>9a950b9</code></a>
Release 2.7.0</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/5ec0de499b9166ca71c65ab04f2a7e4eb0d66fcc"><code>5ec0de4</code></a>
Merge commit from fork</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/2bdcc44d1e163fb5cc48a8662425e35e15adfe6a"><code>2bdcc44</code></a>
Merge commit from fork</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/f45b0df09d8620ac6ed0491eb9362c8c87b7bc2c"><code>f45b0df</code></a>
Fix a misleading example for <code>ProxyManager</code> (<a
href="https://redirect.github.com/urllib3/urllib3/issues/4970">#4970</a>)</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/577193ca029872384f82c133449e0935f6d8a64b"><code>577193c</code></a>
Switch to nightly PyPy3.11 in CI for now (<a
href="https://redirect.github.com/urllib3/urllib3/issues/4984">#4984</a>)</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/e90af45bb006c3a452a3a21644a2681523f5c7fc"><code>e90af45</code></a>
Avoid infinite loop in <code>HTTPResponse.read_chunked</code> when
<code>amt=0</code> (<a
href="https://redirect.github.com/urllib3/urllib3/issues/4974">#4974</a>)</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/67ed74fdaec6659a6534621ec8e3aaaa6f976210"><code>67ed74f</code></a>
Bump dev dependencies (<a
href="https://redirect.github.com/urllib3/urllib3/issues/4972">#4972</a>)</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/3abd481097b54d87b574ac7ea593c3f40938a84d"><code>3abd481</code></a>
Upgrade mypy to version 1.20.2 (<a
href="https://redirect.github.com/urllib3/urllib3/issues/4978">#4978</a>)</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/2b8725dfcac4f21d4d93cc0cc3a64a33af08f890"><code>2b8725d</code></a>
Drop support for EOL PyPy3.10 (<a
href="https://redirect.github.com/urllib3/urllib3/issues/4979">#4979</a>)</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/2944b2a0a6c573f5548a39cfd17196f98ee21b33"><code>2944b2a</code></a>
Upgrade <code>setup-chrome</code> and <code>setup-firefox</code> to fix
warnings (<a
href="https://redirect.github.com/urllib3/urllib3/issues/4973">#4973</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/urllib3/urllib3/compare/2.6.3...2.7.0">compare
view</a></li>
</ul>
</details>
<br />


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.github/workflows/_compile_integration_test.yml

@@ -8,6 +8,9 @@ on:
         type: string
         description: "From which folder this pipeline executes"
 
+permissions:
+  contents: read
+
 jobs:
   build:
     defaults:

.github/workflows/_lint.yml

@@ -8,6 +8,9 @@ on:
         type: string
         description: "From which folder this pipeline executes"
 
+permissions:
+  contents: read
+
 env:
   WORKDIR: ${{ inputs.working-directory == '' && '.' || inputs.working-directory }}
 

.github/workflows/_release.yml

@@ -19,6 +19,9 @@ on:
         default: false
         description: "Release from a non-master branch (danger!)"
 
+permissions:
+  contents: read
+
 env:
   PYTHON_VERSION: "3.11"
 
@@ -80,7 +83,9 @@ jobs:
       - build
     uses:
       ./.github/workflows/_test_release.yml
-    permissions: write-all
+    permissions:
+      contents: read
+      id-token: write
     with:
       working-directory: ${{ inputs.working-directory }}
       dangerous-nonmaster-release: ${{ inputs.dangerous-nonmaster-release }}

.github/workflows/_test.yml

@@ -8,6 +8,9 @@ on:
         type: string
         description: "From which folder this pipeline executes"
 
+permissions:
+  contents: read
+
 jobs:
   build:
     defaults:

.github/workflows/_test_release.yml

@@ -13,6 +13,9 @@ on:
         default: false
         description: "Release from a non-master branch (danger!)"
 
+permissions:
+  contents: read
+
 env:
   PYTHON_VERSION: "3.11"
 

.github/workflows/check_diffs.yml

@@ -16,6 +16,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-latest

README.md

@@ -4,6 +4,9 @@ This repository contains 1 package with experimental features of LangChain:
 
 - [langchain-experimental](https://pypi.org/project/langchain-experimental/)
 
+> [!WARNING]
+> **`langchain-experimental` is being sunset.** See [#87](https://github.com/langchain-ai/langchain-experimental/issues/87) for details. Thank you to everyone who has contributed ideas, prototypes, fixes, reviews, and maintenance over the years.
+
 > [!WARNING]
 > Portions of the code in this package may be dangerous if not properly deployed
 > in a sandboxed environment. Please be wary of deploying experimental code

libs/experimental/README.md

@@ -3,6 +3,9 @@
 This package holds experimental LangChain code, intended for research and experimental
 uses.
 
+> [!WARNING]
+> **`langchain-experimental` is being sunset.** See [#87](https://github.com/langchain-ai/langchain-experimental/issues/87) for details. Thank you to everyone who has contributed ideas, prototypes, fixes, reviews, and maintenance over the years.
+
 > [!WARNING]
 > Portions of the code in this package may be dangerous if not properly deployed
 > in a sandboxed environment. Please be wary of deploying experimental code

libs/experimental/langchain_experimental/__init__.py

@@ -1,3 +1,4 @@
+import warnings
 from importlib import metadata
 
 try:
@@ -6,3 +7,12 @@ except metadata.PackageNotFoundError:
     # Case where package metadata is not available.
     __version__ = ""
 del metadata  # optional, avoids polluting the results of dir(__package__)
+
+warnings.warn(
+    "`langchain-experimental` is being sunset and is no longer actively "
+    "maintained. See "
+    "https://github.com/langchain-ai/langchain-experimental/issues/87 for "
+    "details.",
+    DeprecationWarning,
+    stacklevel=2,
+)

libs/experimental/langchain_experimental/llms/anthropic_functions.py

@@ -7,7 +7,28 @@ from langchain_classic.schema import (
     ChatGeneration,
     ChatResult,
 )
-from langchain_community.chat_models.anthropic import ChatAnthropic
+
+try:
+    from langchain_community.chat_models.anthropic import ChatAnthropic
+except ImportError as e:
+    _IMPORT_ERROR = e
+
+    class ChatAnthropic:  # type: ignore[no-redef]
+        """Stub for environments where `langchain-community` no longer ships
+        `langchain_community.chat_models.anthropic` (removed in 0.4.2)."""
+
+        def __init__(self, *args: Any, **kwargs: Any) -> None:
+            raise ImportError(
+                "`AnthropicFunctions` depends on `langchain_community.chat_"
+                "models.anthropic.ChatAnthropic`, which was removed in "
+                "`langchain-community>=0.4.2`. Anthropic now supports tool "
+                "calling natively; use `langchain_anthropic.ChatAnthropic` "
+                "with `bind_tools` instead. Note: `langchain-experimental` is "
+                "being sunset; see "
+                "https://github.com/langchain-ai/langchain-experimental/issues/87."
+            ) from _IMPORT_ERROR
+
+
 from langchain_core._api.deprecation import deprecated
 from langchain_core.callbacks.manager import (
     CallbackManagerForLLMRun,

libs/experimental/langchain_experimental/llms/ollama_functions.py

@@ -15,7 +15,26 @@ from typing import (
     cast,
 )
 
-from langchain_community.chat_models.ollama import ChatOllama
+try:
+    from langchain_community.chat_models.ollama import ChatOllama
+except ImportError as e:
+    _IMPORT_ERROR = e
+
+    class ChatOllama:  # type: ignore[no-redef]
+        """Stub for environments where `langchain-community` no longer ships
+        `langchain_community.chat_models.ollama` (removed in 0.4.2)."""
+
+        def __init__(self, *args: Any, **kwargs: Any) -> None:
+            raise ImportError(
+                "`OllamaFunctions` depends on `langchain_community.chat_models."
+                "ollama.ChatOllama`, which was removed in "
+                "`langchain-community>=0.4.2`. Use `langchain_ollama.ChatOllama`"
+                " directly instead. Note: `langchain-experimental` is being "
+                "sunset; see "
+                "https://github.com/langchain-ai/langchain-experimental/issues/87."
+            ) from _IMPORT_ERROR
+
+
 from langchain_core._api import deprecated
 from langchain_core.callbacks import (
     AsyncCallbackManagerForLLMRun,

libs/experimental/langchain_experimental/tabular_synthetic_data/openai.py

@@ -2,10 +2,29 @@ from typing import Any, Dict, Optional, Type, Union
 
 from langchain_classic.chains.openai_functions import create_structured_output_chain
 from langchain_classic.schema import BaseLLMOutputParser, BasePromptTemplate
-from langchain_community.chat_models import ChatOpenAI
 from langchain_core.prompts import PromptTemplate
 from pydantic import BaseModel
 
+try:
+    from langchain_community.chat_models import ChatOpenAI
+except ImportError as e:
+    _IMPORT_ERROR = e
+
+    class ChatOpenAI:  # type: ignore[no-redef]
+        """Stub for environments where `langchain-community` no longer exports
+        `ChatOpenAI` (removed in 0.4.2)."""
+
+        def __init__(self, *args: Any, **kwargs: Any) -> None:
+            raise ImportError(
+                "`langchain_experimental.tabular_synthetic_data.openai` depends "
+                "on `langchain_community.chat_models.ChatOpenAI`, which was "
+                "removed in `langchain-community>=0.4.2`. Use "
+                "`langchain_openai.ChatOpenAI` directly instead. Note: "
+                "`langchain-experimental` is being sunset; see "
+                "https://github.com/langchain-ai/langchain-experimental/issues/87."
+            ) from _IMPORT_ERROR
+
+
 from langchain_experimental.tabular_synthetic_data.base import SyntheticDataGenerator
 
 OPENAI_TEMPLATE = PromptTemplate(input_variables=["example"], template="{example}")

libs/experimental/langchain_experimental/text_splitter.py

@@ -160,7 +160,7 @@ class SemanticChunker(BaseDocumentTransformer):
             return cast(
                 float,
                 np.percentile(distance_gradient, self.breakpoint_threshold_amount),
-            ), distance_gradient
+            ), cast(List[float], distance_gradient)
         else:
             raise ValueError(
                 f"Got unexpected `breakpoint_threshold_type`: "

libs/experimental/pyproject.toml

@@ -7,11 +7,11 @@ authors = []
 license = {text = "MIT"}
 requires-python = "<4.0,>=3.10"
 dependencies = [
-    "langchain-core<2.0.0,>=1.0.0",
-    "langchain-community<1.0.0,>=0.4.0",
+    "langchain-core<2.0.0,>=1.4.0",
+    "langchain-community<1.0.0,>=0.4.2",
 ]
 name = "langchain-experimental"
-version = "0.4.1"
+version = "0.4.2"
 description = "Building applications with LLMs through composability"
 readme = "README.md"
 
@@ -34,14 +34,14 @@ typing = [
 ]
 dev = [
     "jupyter<2.0.0,>=1.0.0",
-    "setuptools<68.0.0,>=67.6.1",
+    "setuptools>=67.6.1,<79.0.0",
     "langchain-classic @ git+https://github.com/langchain-ai/langchain.git#subdirectory=libs/langchain",
     "langchain-core @ git+https://github.com/langchain-ai/langchain.git#subdirectory=libs/core",
     "langchain-community @ git+https://github.com/langchain-ai/langchain-community.git#subdirectory=libs/community",
 ]
 test = [
-    "pytest<8.0.0,>=7.3.0",
-    "pytest-asyncio<1.0.0,>=0.20.3",
+    "pytest>=7.3.0,<10.0.0",
+    "pytest-asyncio<2.0.0,>=1.3.0",
     "langchain-classic @ git+https://github.com/langchain-ai/langchain.git#subdirectory=libs/langchain",
     "langchain-core @ git+https://github.com/langchain-ai/langchain.git#subdirectory=libs/core",
     "langchain-community @ git+https://github.com/langchain-ai/langchain-community.git#subdirectory=libs/community",

libs/experimental/tests/integration_tests/chains/test_synthetic_data_openai.py

@@ -1,7 +1,17 @@
 import pytest
-from langchain_community.chat_models import ChatOpenAI
-from langchain_core.prompts.few_shot import FewShotPromptTemplate
-from pydantic import BaseModel
+
+try:
+    from langchain_community.chat_models import ChatOpenAI
+except ImportError:
+    pytest.skip(
+        "`langchain_community.chat_models.ChatOpenAI` was removed in "
+        "`langchain-community>=0.4.2`; use `langchain_openai.ChatOpenAI` "
+        "instead.",
+        allow_module_level=True,
+    )
+
+from langchain_core.prompts.few_shot import FewShotPromptTemplate  # noqa: E402
+from pydantic import BaseModel  # noqa: E402
 
 from langchain_experimental.tabular_synthetic_data.base import SyntheticDataGenerator
 from langchain_experimental.tabular_synthetic_data.openai import (

libs/experimental/tests/integration_tests/llms/test_anthropic_functions.py

@@ -2,10 +2,23 @@
 
 import unittest
 
-from langchain_community.chat_models.anthropic import ChatAnthropic
-from langchain_community.chat_models.bedrock import BedrockChat
+import pytest
 
-from langchain_experimental.llms.anthropic_functions import AnthropicFunctions
+try:
+    from langchain_community.chat_models.anthropic import ChatAnthropic
+    from langchain_community.chat_models.bedrock import BedrockChat
+except ImportError:
+    pytest.skip(
+        "`langchain_community.chat_models.anthropic` and "
+        "`langchain_community.chat_models.bedrock` were removed in "
+        "`langchain-community>=0.4.2`; use `langchain_anthropic.ChatAnthropic` "
+        "and `langchain_aws.ChatBedrock` instead.",
+        allow_module_level=True,
+    )
+
+from langchain_experimental.llms.anthropic_functions import (  # noqa: E402
+    AnthropicFunctions,
+)
 
 
 class TestAnthropicFunctions(unittest.TestCase):

libs/experimental/tests/unit_tests/test_ollama_functions.py

@@ -2,10 +2,20 @@ import json
 from typing import Any
 from unittest.mock import patch
 
-from langchain_core.prompts import ChatPromptTemplate
-from pydantic import BaseModel
+import pytest
 
-from langchain_experimental.llms.ollama_functions import OllamaFunctions
+pytest.importorskip(
+    "langchain_community.chat_models.ollama",
+    reason=(
+        "`langchain_community.chat_models.ollama` was removed in "
+        "`langchain-community>=0.4.2`; `OllamaFunctions` is unusable without it."
+    ),
+)
+
+from langchain_core.prompts import ChatPromptTemplate  # noqa: E402
+from pydantic import BaseModel  # noqa: E402
+
+from langchain_experimental.llms.ollama_functions import OllamaFunctions  # noqa: E402
 
 
 class Schema(BaseModel):