diff --git a/docs/modules/agents/examples/load_from_hub.ipynb b/docs/modules/agents/examples/load_from_hub.ipynb
index 7b5e0b1b0ce..bc1bc760e9f 100644
--- a/docs/modules/agents/examples/load_from_hub.ipynb
+++ b/docs/modules/agents/examples/load_from_hub.ipynb
@@ -62,13 +62,26 @@
     "self_ask_with_search.run(\"What is the hometown of the reigning men's U.S. Open champion?\")"
    ]
   },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "id": "3aede965",
+   "metadata": {},
+   "source": [
+    "# Pinning Dependencies\n",
+    "\n",
+    "Specific versions of LangChainHub agents can be pinned with the `lc@<ref>://` syntax."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
    "id": "e679f7b6",
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "self_ask_with_search = initialize_agent(tools, llm, agent_path=\"lc@2826ef9e8acdf88465e1e5fc8a7bf59e0f9d0a85://agents/self-ask-with-search/agent.json\", verbose=True)"
+   ]
   }
  ],
  "metadata": {
diff --git a/langchain/agents/loading.py b/langchain/agents/loading.py
index bdf04c02415..3298895b539 100644
--- a/langchain/agents/loading.py
+++ b/langchain/agents/loading.py
@@ -1,11 +1,8 @@
 """Functionality for loading agents."""
 import json
-import os
-import tempfile
 from pathlib import Path
 from typing import Any, List, Optional, Union
 
-import requests
 import yaml
 
 from langchain.agents.agent import Agent
@@ -16,6 +13,7 @@ from langchain.agents.self_ask_with_search.base import SelfAskWithSearchAgent
 from langchain.agents.tools import Tool
 from langchain.chains.loading import load_chain, load_chain_from_config
 from langchain.llms.base import BaseLLM
+from langchain.utilities.loading import try_load_from_hub
 
 AGENT_TO_CLASS = {
     "zero-shot-react-description": ZeroShotAgent,
@@ -81,29 +79,14 @@ def load_agent_from_config(
 
 def load_agent(path: Union[str, Path], **kwargs: Any) -> Agent:
     """Unified method for loading a agent from LangChainHub or local fs."""
-    if isinstance(path, str) and path.startswith("lc://agents"):
-        path = os.path.relpath(path, "lc://agents/")
-        return _load_from_hub(path, **kwargs)
+    if hub_result := try_load_from_hub(
+        path, _load_agent_from_file, "agents", {"json", "yaml"}
+    ):
+        return hub_result
     else:
         return _load_agent_from_file(path, **kwargs)
 
 
-def _load_from_hub(path: str, **kwargs: Any) -> Agent:
-    """Load agent from hub."""
-    suffix = path.split(".")[-1]
-    if suffix not in {"json", "yaml"}:
-        raise ValueError("Unsupported file type.")
-    full_url = URL_BASE + path
-    r = requests.get(full_url)
-    if r.status_code != 200:
-        raise ValueError(f"Could not find file at {full_url}")
-    with tempfile.TemporaryDirectory() as tmpdirname:
-        file = tmpdirname + "/agent." + suffix
-        with open(file, "wb") as f:
-            f.write(r.content)
-        return _load_agent_from_file(file, **kwargs)
-
-
 def _load_agent_from_file(file: Union[str, Path], **kwargs: Any) -> Agent:
     """Load agent from file."""
     # Convert file to Path object.
diff --git a/langchain/chains/loading.py b/langchain/chains/loading.py
index 10095d02c90..7e42969c3cc 100644
--- a/langchain/chains/loading.py
+++ b/langchain/chains/loading.py
@@ -1,11 +1,8 @@
 """Functionality for loading chains."""
 import json
-import os
-import tempfile
 from pathlib import Path
 from typing import Any, Union
 
-import requests
 import yaml
 
 from langchain.chains.api.base import APIChain
@@ -27,6 +24,7 @@ from langchain.chains.sql_database.base import SQLDatabaseChain
 from langchain.chains.vector_db_qa.base import VectorDBQA
 from langchain.llms.loading import load_llm, load_llm_from_config
 from langchain.prompts.loading import load_prompt, load_prompt_from_config
+from langchain.utilities.loading import try_load_from_hub
 
 URL_BASE = "https://raw.githubusercontent.com/hwchase17/langchain-hub/master/chains/"
 
@@ -441,9 +439,10 @@ def load_chain_from_config(config: dict, **kwargs: Any) -> Chain:
 
 def load_chain(path: Union[str, Path], **kwargs: Any) -> Chain:
     """Unified method for loading a chain from LangChainHub or local fs."""
-    if isinstance(path, str) and path.startswith("lc://chains"):
-        path = os.path.relpath(path, "lc://chains/")
-        return _load_from_hub(path, **kwargs)
+    if hub_result := try_load_from_hub(
+        path, _load_chain_from_file, "chains", {"json", "yaml"}
+    ):
+        return hub_result
     else:
         return _load_chain_from_file(path, **kwargs)
 
@@ -466,19 +465,3 @@ def _load_chain_from_file(file: Union[str, Path], **kwargs: Any) -> Chain:
         raise ValueError("File type must be json or yaml")
     # Load the chain from the config now.
     return load_chain_from_config(config, **kwargs)
-
-
-def _load_from_hub(path: str, **kwargs: Any) -> Chain:
-    """Load chain from hub."""
-    suffix = path.split(".")[-1]
-    if suffix not in {"json", "yaml"}:
-        raise ValueError("Unsupported file type.")
-    full_url = URL_BASE + path
-    r = requests.get(full_url)
-    if r.status_code != 200:
-        raise ValueError(f"Could not find file at {full_url}")
-    with tempfile.TemporaryDirectory() as tmpdirname:
-        file = tmpdirname + "/chain." + suffix
-        with open(file, "wb") as f:
-            f.write(r.content)
-        return _load_chain_from_file(file, **kwargs)
diff --git a/langchain/prompts/loading.py b/langchain/prompts/loading.py
index eaae6ad6c5f..30be599a7a1 100644
--- a/langchain/prompts/loading.py
+++ b/langchain/prompts/loading.py
@@ -1,17 +1,15 @@
 """Load prompts from disk."""
 import importlib
 import json
-import os
-import tempfile
 from pathlib import Path
 from typing import Union
 
-import requests
 import yaml
 
 from langchain.prompts.base import BasePromptTemplate, RegexParser
 from langchain.prompts.few_shot import FewShotPromptTemplate
 from langchain.prompts.prompt import PromptTemplate
+from langchain.utilities.loading import try_load_from_hub
 
 URL_BASE = "https://raw.githubusercontent.com/hwchase17/langchain-hub/master/prompts/"
 
@@ -114,9 +112,10 @@ def _load_prompt(config: dict) -> PromptTemplate:
 
 def load_prompt(path: Union[str, Path]) -> BasePromptTemplate:
     """Unified method for loading a prompt from LangChainHub or local fs."""
-    if isinstance(path, str) and path.startswith("lc://prompts"):
-        path = os.path.relpath(path, "lc://prompts/")
-        return _load_from_hub(path)
+    if hub_result := try_load_from_hub(
+        path, _load_prompt_from_file, "prompts", {"py", "json", "yaml"}
+    ):
+        return hub_result
     else:
         return _load_prompt_from_file(path)
 
@@ -151,19 +150,3 @@ def _load_prompt_from_file(file: Union[str, Path]) -> BasePromptTemplate:
         raise ValueError(f"Got unsupported file type {file_path.suffix}")
     # Load the prompt from the config now.
     return load_prompt_from_config(config)
-
-
-def _load_from_hub(path: str) -> BasePromptTemplate:
-    """Load prompt from hub."""
-    suffix = path.split(".")[-1]
-    if suffix not in {"py", "json", "yaml"}:
-        raise ValueError("Unsupported file type.")
-    full_url = URL_BASE + path
-    r = requests.get(full_url)
-    if r.status_code != 200:
-        raise ValueError(f"Could not find file at {full_url}")
-    with tempfile.TemporaryDirectory() as tmpdirname:
-        file = tmpdirname + "/prompt." + suffix
-        with open(file, "wb") as f:
-            f.write(r.content)
-        return _load_prompt_from_file(file)
diff --git a/langchain/utilities/loading.py b/langchain/utilities/loading.py
new file mode 100644
index 00000000000..6b70318d450
--- /dev/null
+++ b/langchain/utilities/loading.py
@@ -0,0 +1,49 @@
+"""Utilities for loading configurations from langchian-hub."""
+
+import os
+import re
+import tempfile
+from pathlib import Path
+from typing import Any, Callable, Optional, Set, TypeVar, Union
+from urllib.parse import urljoin
+
+import requests
+
+DEFAULT_REF = os.environ.get("LANGCHAIN_HUB_DEFAULT_REF", "master")
+URL_BASE = os.environ.get(
+    "LANGCHAIN_HUB_URL_BASE",
+    "https://raw.githubusercontent.com/hwchase17/langchain-hub/{ref}/",
+)
+HUB_PATH_RE = re.compile(r"lc(?P<ref>@[^:]+)?://(?P<path>.*)")
+
+
+T = TypeVar("T")
+
+
+def try_load_from_hub(
+    path: Union[str, Path],
+    loader: Callable[[str], T],
+    valid_prefix: str,
+    valid_suffixes: Set[str],
+    **kwargs: Any,
+) -> Optional[T]:
+    """Load configuration from hub.  Returns None if path is not a hub path."""
+    if not isinstance(path, str) or not (match := HUB_PATH_RE.match(path)):
+        return None
+    ref, remote_path_str = match.groups()
+    ref = ref[1:] if ref else DEFAULT_REF
+    remote_path = Path(remote_path_str)
+    if remote_path.parts[0] != valid_prefix:
+        return None
+    if remote_path.suffix[1:] not in valid_suffixes:
+        raise ValueError("Unsupported file type.")
+
+    full_url = urljoin(URL_BASE.format(ref=ref), str(remote_path))
+    r = requests.get(full_url, timeout=5)
+    if r.status_code != 200:
+        raise ValueError(f"Could not find file at {full_url}")
+    with tempfile.TemporaryDirectory() as tmpdirname:
+        file = Path(tmpdirname) / remote_path.name
+        with open(file, "wb") as f:
+            f.write(r.content)
+        return loader(str(file), **kwargs)
diff --git a/poetry.lock b/poetry.lock
index 1e3ffe4e491..dc2adb7c7a7 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -2270,6 +2270,7 @@ files = [
     {file = "lxml-4.9.2-cp35-cp35m-manylinux_2_5_i686.manylinux1_i686.whl", hash = "sha256:ca989b91cf3a3ba28930a9fc1e9aeafc2a395448641df1f387a2d394638943b0"},
     {file = "lxml-4.9.2-cp35-cp35m-manylinux_2_5_x86_64.manylinux1_x86_64.whl", hash = "sha256:822068f85e12a6e292803e112ab876bc03ed1f03dddb80154c395f891ca6b31e"},
     {file = "lxml-4.9.2-cp35-cp35m-win32.whl", hash = "sha256:be7292c55101e22f2a3d4d8913944cbea71eea90792bf914add27454a13905df"},
+    {file = "lxml-4.9.2-cp35-cp35m-win_amd64.whl", hash = "sha256:998c7c41910666d2976928c38ea96a70d1aa43be6fe502f21a651e17483a43c5"},
     {file = "lxml-4.9.2-cp36-cp36m-macosx_10_15_x86_64.whl", hash = "sha256:b26a29f0b7fc6f0897f043ca366142d2b609dc60756ee6e4e90b5f762c6adc53"},
     {file = "lxml-4.9.2-cp36-cp36m-manylinux_2_12_i686.manylinux2010_i686.manylinux_2_24_i686.whl", hash = "sha256:ab323679b8b3030000f2be63e22cdeea5b47ee0abd2d6a1dc0c8103ddaa56cd7"},
     {file = "lxml-4.9.2-cp36-cp36m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:689bb688a1db722485e4610a503e3e9210dcc20c520b45ac8f7533c837be76fe"},
@@ -2279,6 +2280,7 @@ files = [
     {file = "lxml-4.9.2-cp36-cp36m-musllinux_1_1_aarch64.whl", hash = "sha256:58bfa3aa19ca4c0f28c5dde0ff56c520fbac6f0daf4fac66ed4c8d2fb7f22e74"},
     {file = "lxml-4.9.2-cp36-cp36m-musllinux_1_1_x86_64.whl", hash = "sha256:bc718cd47b765e790eecb74d044cc8d37d58562f6c314ee9484df26276d36a38"},
     {file = "lxml-4.9.2-cp36-cp36m-win32.whl", hash = "sha256:d5bf6545cd27aaa8a13033ce56354ed9e25ab0e4ac3b5392b763d8d04b08e0c5"},
+    {file = "lxml-4.9.2-cp36-cp36m-win_amd64.whl", hash = "sha256:3ab9fa9d6dc2a7f29d7affdf3edebf6ece6fb28a6d80b14c3b2fb9d39b9322c3"},
     {file = "lxml-4.9.2-cp37-cp37m-macosx_10_15_x86_64.whl", hash = "sha256:05ca3f6abf5cf78fe053da9b1166e062ade3fa5d4f92b4ed688127ea7d7b1d03"},
     {file = "lxml-4.9.2-cp37-cp37m-manylinux_2_12_i686.manylinux2010_i686.manylinux_2_24_i686.whl", hash = "sha256:a5da296eb617d18e497bcf0a5c528f5d3b18dadb3619fbdadf4ed2356ef8d941"},
     {file = "lxml-4.9.2-cp37-cp37m-manylinux_2_17_aarch64.manylinux2014_aarch64.manylinux_2_24_aarch64.whl", hash = "sha256:04876580c050a8c5341d706dd464ff04fd597095cc8c023252566a8826505726"},
@@ -4176,6 +4178,27 @@ urllib3 = ">=1.21.1,<1.27"
 socks = ["PySocks (>=1.5.6,!=1.5.7)"]
 use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
 
+[[package]]
+name = "responses"
+version = "0.22.0"
+description = "A utility library for mocking out the `requests` Python library."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "responses-0.22.0-py3-none-any.whl", hash = "sha256:dcf294d204d14c436fddcc74caefdbc5764795a40ff4e6a7740ed8ddbf3294be"},
+    {file = "responses-0.22.0.tar.gz", hash = "sha256:396acb2a13d25297789a5866b4881cf4e46ffd49cc26c43ab1117f40b973102e"},
+]
+
+[package.dependencies]
+requests = ">=2.22.0,<3.0"
+toml = "*"
+types-toml = "*"
+urllib3 = ">=1.25.10"
+
+[package.extras]
+tests = ["coverage (>=6.0.0)", "flake8", "mypy", "pytest (>=7.0.0)", "pytest-asyncio", "pytest-cov", "pytest-httpserver", "types-requests"]
+
 [[package]]
 name = "rfc3339-validator"
 version = "0.1.4"
@@ -5010,11 +5033,14 @@ files = [
     {file = "tokenizers-0.13.2-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:47ef745dbf9f49281e900e9e72915356d69de3a4e4d8a475bda26bfdb5047736"},
     {file = "tokenizers-0.13.2-cp310-cp310-win32.whl", hash = "sha256:96cedf83864bcc15a3ffd088a6f81a8a8f55b8b188eabd7a7f2a4469477036df"},
     {file = "tokenizers-0.13.2-cp310-cp310-win_amd64.whl", hash = "sha256:eda77de40a0262690c666134baf19ec5c4f5b8bde213055911d9f5a718c506e1"},
+    {file = "tokenizers-0.13.2-cp311-cp311-macosx_10_11_universal2.whl", hash = "sha256:9eee037bb5aa14daeb56b4c39956164b2bebbe6ab4ca7779d88aa16b79bd4e17"},
+    {file = "tokenizers-0.13.2-cp311-cp311-macosx_12_0_arm64.whl", hash = "sha256:d1b079c4c9332048fec4cb9c2055c2373c74fbb336716a5524c9a720206d787e"},
     {file = "tokenizers-0.13.2-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a689654fc745135cce4eea3b15e29c372c3e0b01717c6978b563de5c38af9811"},
     {file = "tokenizers-0.13.2-cp311-cp311-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:3606528c07cda0566cff6cbfbda2b167f923661be595feac95701ffcdcbdbb21"},
     {file = "tokenizers-0.13.2-cp311-cp311-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:41291d0160946084cbd53c8ec3d029df3dc2af2673d46b25ff1a7f31a9d55d51"},
     {file = "tokenizers-0.13.2-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:7892325f9ca1cc5fca0333d5bfd96a19044ce9b092ce2df625652109a3de16b8"},
     {file = "tokenizers-0.13.2-cp311-cp311-win32.whl", hash = "sha256:93714958d4ebe5362d3de7a6bd73dc86c36b5af5941ebef6c325ac900fa58865"},
+    {file = "tokenizers-0.13.2-cp311-cp311-win_amd64.whl", hash = "sha256:fa7ef7ee380b1f49211bbcfac8a006b1a3fa2fa4c7f4ee134ae384eb4ea5e453"},
     {file = "tokenizers-0.13.2-cp37-cp37m-macosx_10_11_x86_64.whl", hash = "sha256:da521bfa94df6a08a6254bb8214ea04854bb9044d61063ae2529361688b5440a"},
     {file = "tokenizers-0.13.2-cp37-cp37m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a739d4d973d422e1073989769723f3b6ad8b11e59e635a63de99aea4b2208188"},
     {file = "tokenizers-0.13.2-cp37-cp37m-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:cac01fc0b868e4d0a3aa7c5c53396da0a0a63136e81475d32fcf5c348fcb2866"},
@@ -5023,6 +5049,7 @@ files = [
     {file = "tokenizers-0.13.2-cp37-cp37m-win32.whl", hash = "sha256:a537061ee18ba104b7f3daa735060c39db3a22c8a9595845c55b6c01d36c5e87"},
     {file = "tokenizers-0.13.2-cp37-cp37m-win_amd64.whl", hash = "sha256:c82fb87b1cbfa984d8f05b2b3c3c73e428b216c1d4f0e286d0a3b27f521b32eb"},
     {file = "tokenizers-0.13.2-cp38-cp38-macosx_10_11_x86_64.whl", hash = "sha256:ce298605a833ac7f81b8062d3102a42dcd9fa890493e8f756112c346339fe5c5"},
+    {file = "tokenizers-0.13.2-cp38-cp38-macosx_12_0_arm64.whl", hash = "sha256:f44d59bafe3d61e8a56b9e0a963075187c0f0091023120b13fbe37a87936f171"},
     {file = "tokenizers-0.13.2-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a51b93932daba12ed07060935978a6779593a59709deab04a0d10e6fd5c29e60"},
     {file = "tokenizers-0.13.2-cp38-cp38-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:6969e5ea7ccb909ce7d6d4dfd009115dc72799b0362a2ea353267168667408c4"},
     {file = "tokenizers-0.13.2-cp38-cp38-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:92f040c4d938ea64683526b45dfc81c580e3b35aaebe847e7eec374961231734"},
@@ -5666,4 +5693,4 @@ llms = ["manifest-ml", "torch", "transformers"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8.1,<4.0"
-content-hash = "537ede877b299a8800eb26a428607be97b59f89435259abda2c7cc86092306c6"
+content-hash = "bed5e0cb4cfa8b6173dd9574982bd9154ebc61721704002b85474af3c2b675ca"
diff --git a/pyproject.toml b/pyproject.toml
index 39cb771a452..d093d5b3baf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,6 +57,7 @@ pytest-dotenv = "^0.5.2"
 duckdb-engine = "^0.6.6"
 pytest-watcher = "^0.2.6"
 freezegun = "^1.2.2"
+responses = "^0.22.0"
 
 [tool.poetry.group.lint.dependencies]
 flake8-docstrings = "^1.6.0"
diff --git a/tests/unit_tests/utilities/__init__.py b/tests/unit_tests/utilities/__init__.py
new file mode 100644
index 00000000000..c3bc6c0518f
--- /dev/null
+++ b/tests/unit_tests/utilities/__init__.py
@@ -0,0 +1 @@
+"""Tests utilities module."""
diff --git a/tests/unit_tests/utilities/test_loading.py b/tests/unit_tests/utilities/test_loading.py
new file mode 100644
index 00000000000..380297f740c
--- /dev/null
+++ b/tests/unit_tests/utilities/test_loading.py
@@ -0,0 +1,93 @@
+"""Test the functionality of loading from langchain-hub."""
+
+import json
+import re
+from pathlib import Path
+from typing import Iterable
+from unittest.mock import Mock
+from urllib.parse import urljoin
+
+import pytest
+import responses
+
+from langchain.utilities.loading import DEFAULT_REF, URL_BASE, try_load_from_hub
+
+
+@pytest.fixture(autouse=True)
+def mocked_responses() -> Iterable[responses.RequestsMock]:
+    """Fixture mocking requests.get."""
+    with responses.RequestsMock() as rsps:
+        yield rsps
+
+
+def test_non_hub_path() -> None:
+    """Test that a non-hub path returns None."""
+    path = "chains/some_path"
+    loader = Mock()
+    valid_suffixes = {"suffix"}
+    result = try_load_from_hub(path, loader, "chains", valid_suffixes)
+
+    assert result is None
+    loader.assert_not_called()
+
+
+def test_invalid_prefix() -> None:
+    """Test that a hub path with an invalid prefix returns None."""
+    path = "lc://agents/some_path"
+    loader = Mock()
+    valid_suffixes = {"suffix"}
+    result = try_load_from_hub(path, loader, "chains", valid_suffixes)
+
+    assert result is None
+    loader.assert_not_called()
+
+
+def test_invalid_suffix() -> None:
+    """Test that a hub path with an invalid suffix raises an error."""
+    path = "lc://chains/path.invalid"
+    loader = Mock()
+    valid_suffixes = {"json"}
+
+    with pytest.raises(ValueError, match="Unsupported file type."):
+        try_load_from_hub(path, loader, "chains", valid_suffixes)
+
+    loader.assert_not_called()
+
+
+@pytest.mark.parametrize("ref", [None, "v0.3"])
+def test_success(mocked_responses: responses.RequestsMock, ref: str) -> None:
+    """Test that a valid hub path is loaded correctly with and without a ref."""
+    path = "chains/path/chain.json"
+    lc_path_prefix = f"lc{('@' + ref) if ref else ''}://"
+    valid_suffixes = {"json"}
+    body = json.dumps({"foo": "bar"})
+    ref = ref or DEFAULT_REF
+
+    file_contents = None
+
+    def loader(file_path: str) -> None:
+        nonlocal file_contents
+        assert file_contents is None
+        file_contents = Path(file_path).read_text()
+
+    mocked_responses.get(
+        urljoin(URL_BASE.format(ref=ref), path),
+        body=body,
+        status=200,
+        content_type="application/json",
+    )
+
+    try_load_from_hub(f"{lc_path_prefix}{path}", loader, "chains", valid_suffixes)
+    assert file_contents == body
+
+
+def test_failed_request(mocked_responses: responses.RequestsMock) -> None:
+    """Test that a failed request raises an error."""
+    path = "chains/path/chain.json"
+    loader = Mock()
+
+    mocked_responses.get(urljoin(URL_BASE.format(ref=DEFAULT_REF), path), status=500)
+
+    with pytest.raises(ValueError, match=re.compile("Could not find file at .*")):
+        try_load_from_hub(f"lc://{path}", loader, "chains", {"json"})
+    loader.assert_not_called()