langchain[patch]: deprecate old agent classes and methods (#15558)

libs/langchain/langchain/agents/agent.py

@@ -21,6 +21,7 @@
 )
 
 import yaml
+from langchain_core._api import deprecated
 from langchain_core.agents import AgentAction, AgentFinish, AgentStep
 from langchain_core.exceptions import OutputParserException
 from langchain_core.language_models import BaseLanguageModel
@@ -486,6 +487,14 @@ async def aplan(
         return output
 
 
+@deprecated(
+    "0.1.0",
+    alternative=(
+        "Use new agent constructor methods like create_react_agent, create_json_agent, "
+        "create_structured_chat_agent, etc."
+    ),
+    removal="0.2.0",
+)
 class LLMSingleActionAgent(BaseSingleActionAgent):
     """Base class for single action agents."""
 
@@ -568,6 +577,14 @@ def tool_run_logging_kwargs(self) -> Dict:
         }
 
 
+@deprecated(
+    "0.1.0",
+    alternative=(
+        "Use new agent constructor methods like create_react_agent, create_json_agent, "
+        "create_structured_chat_agent, etc."
+    ),
+    removal="0.2.0",
+)
 class Agent(BaseSingleActionAgent):
     """Agent that calls the language model and deciding the action.
 

libs/langchain/langchain/agents/agent_types.py

@@ -1,7 +1,17 @@
 """Module definitions of agent types together with corresponding agents."""
 from enum import Enum
 
+from langchain_core._api import deprecated
 
+
+@deprecated(
+    "0.1.0",
+    alternative=(
+        "Use new agent constructor methods like create_react_agent, create_json_agent, "
+        "create_structured_chat_agent, etc."
+    ),
+    removal="0.2.0",
+)
 class AgentType(str, Enum):
     """An enum for agent types.
 

libs/langchain/langchain/agents/chat/base.py

@@ -1,5 +1,6 @@
 from typing import Any, List, Optional, Sequence, Tuple
 
+from langchain_core._api import deprecated
 from langchain_core.agents import AgentAction
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import BasePromptTemplate
@@ -24,6 +25,7 @@
 from langchain.chains.llm import LLMChain
 
 
+@deprecated("0.1.0", alternative="create_react_agent", removal="0.2.0")
 class ChatAgent(Agent):
     """Chat Agent."""
 

libs/langchain/langchain/agents/conversational/base.py

@@ -3,6 +3,7 @@
 
 from typing import Any, List, Optional, Sequence
 
+from langchain_core._api import deprecated
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import PromptTemplate
 from langchain_core.pydantic_v1 import Field
@@ -17,6 +18,7 @@
 from langchain.chains import LLMChain
 
 
+@deprecated("0.1.0", alternative="create_react_agent", removal="0.2.0")
 class ConversationalAgent(Agent):
     """An agent that holds a conversation in addition to using tools."""
 

libs/langchain/langchain/agents/conversational_chat/base.py

@@ -3,6 +3,7 @@
 
 from typing import Any, List, Optional, Sequence, Tuple
 
+from langchain_core._api import deprecated
 from langchain_core.agents import AgentAction
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.messages import AIMessage, BaseMessage, HumanMessage
@@ -29,6 +30,7 @@
 from langchain.chains import LLMChain
 
 
+@deprecated("0.1.0", alternative="create_json_chat_agent", removal="0.2.0")
 class ConversationalChatAgent(Agent):
     """An agent designed to hold a conversation in addition to using tools."""
 

libs/langchain/langchain/agents/initialize.py

@@ -1,6 +1,7 @@
 """Load agent."""
 from typing import Any, Optional, Sequence
 
+from langchain_core._api import deprecated
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.tools import BaseTool
 
@@ -10,6 +11,14 @@
 from langchain.callbacks.base import BaseCallbackManager
 
 
+@deprecated(
+    "0.1.0",
+    alternative=(
+        "Use new agent constructor methods like create_react_agent, create_json_agent, "
+        "create_structured_chat_agent, etc."
+    ),
+    removal="0.2.0",
+)
 def initialize_agent(
     tools: Sequence[BaseTool],
     llm: BaseLanguageModel,

libs/langchain/langchain/agents/loading.py

@@ -5,6 +5,7 @@
 from typing import Any, List, Optional, Union
 
 import yaml
+from langchain_core._api import deprecated
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.utils.loading import try_load_from_hub
 
@@ -30,6 +31,7 @@ def _load_agent_from_tools(
     return agent_cls.from_llm_and_tools(llm, tools, **combined_config)
 
 
+@deprecated("0.1.0", removal="0.2.0")
 def load_agent_from_config(
     config: dict,
     llm: Optional[BaseLanguageModel] = None,
@@ -85,6 +87,7 @@ def load_agent_from_config(
     return agent_cls(**combined_config)  # type: ignore
 
 
+@deprecated("0.1.0", removal="0.2.0")
 def load_agent(
     path: Union[str, Path], **kwargs: Any
 ) -> Union[BaseSingleActionAgent, BaseMultiActionAgent]:

libs/langchain/langchain/agents/mrkl/base.py

@@ -3,6 +3,7 @@
 
 from typing import Any, Callable, List, NamedTuple, Optional, Sequence
 
+from langchain_core._api import deprecated
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import PromptTemplate
 from langchain_core.pydantic_v1 import Field
@@ -32,6 +33,7 @@ class ChainConfig(NamedTuple):
     action_description: str
 
 
+@deprecated("0.1.0", alternative="create_react_agent", removal="0.2.0")
 class ZeroShotAgent(Agent):
     """Agent for the MRKL chain."""
 
@@ -137,6 +139,7 @@ def _validate_tools(cls, tools: Sequence[BaseTool]) -> None:
         super()._validate_tools(tools)
 
 
+@deprecated("0.1.0", removal="0.2.0")
 class MRKLChain(AgentExecutor):
     """[Deprecated] Chain that implements the MRKL system."""
 

libs/langchain/langchain/agents/openai_functions_agent/base.py

@@ -2,6 +2,7 @@
 from typing import Any, List, Optional, Sequence, Tuple, Union
 
 from langchain_community.tools.convert_to_openai import format_tool_to_openai_function
+from langchain_core._api import deprecated
 from langchain_core.agents import AgentAction, AgentFinish
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.messages import (
@@ -30,6 +31,7 @@
 from langchain.callbacks.manager import Callbacks
 
 
+@deprecated("0.1.0", alternative="create_openai_functions_agent", removal="0.2.0")
 class OpenAIFunctionsAgent(BaseSingleActionAgent):
     """An Agent driven by OpenAIs function powered API.
 

libs/langchain/langchain/agents/openai_functions_multi_agent/base.py

@@ -3,6 +3,7 @@
 from json import JSONDecodeError
 from typing import Any, List, Optional, Sequence, Tuple, Union
 
+from langchain_core._api import deprecated
 from langchain_core.agents import AgentAction, AgentActionMessageLog, AgentFinish
 from langchain_core.exceptions import OutputParserException
 from langchain_core.language_models import BaseLanguageModel
@@ -93,6 +94,7 @@ def _parse_ai_message(message: BaseMessage) -> Union[List[AgentAction], AgentFin
     )
 
 
+@deprecated("0.1.0", alternative="create_openai_tools_agent", removal="0.2.0")
 class OpenAIMultiFunctionsAgent(BaseMultiActionAgent):
     """An Agent driven by OpenAIs function powered API.
 

libs/langchain/langchain/agents/react/base.py

@@ -1,6 +1,7 @@
 """Chain that implements the ReAct paper from https://arxiv.org/pdf/2210.03629.pdf."""
 from typing import Any, List, Optional, Sequence
 
+from langchain_core._api import deprecated
 from langchain_core.documents import Document
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import BasePromptTemplate
@@ -17,6 +18,7 @@
 from langchain.docstore.base import Docstore
 
 
+@deprecated("0.1.0", removal="0.2.0")
 class ReActDocstoreAgent(Agent):
     """Agent for the ReAct chain."""
 
@@ -63,6 +65,7 @@ def llm_prefix(self) -> str:
         return "Thought:"
 
 
+@deprecated("0.1.0", removal="0.2.0")
 class DocstoreExplorer:
     """Class to assist with exploration of a document store."""
 
@@ -112,6 +115,7 @@ def _paragraphs(self) -> List[str]:
         return self.document.page_content.split("\n\n")
 
 
+@deprecated("0.1.0", removal="0.2.0")
 class ReActTextWorldAgent(ReActDocstoreAgent):
     """Agent for the ReAct TextWorld chain."""
 
@@ -131,6 +135,7 @@ def _validate_tools(cls, tools: Sequence[BaseTool]) -> None:
             raise ValueError(f"Tool name should be Play, got {tool_names}")
 
 
+@deprecated("0.1.0", removal="0.2.0")
 class ReActChain(AgentExecutor):
     """[Deprecated] Chain that implements the ReAct paper."""
 

libs/langchain/langchain/agents/self_ask_with_search/base.py

@@ -4,6 +4,7 @@
 from langchain_community.utilities.google_serper import GoogleSerperAPIWrapper
 from langchain_community.utilities.searchapi import SearchApiAPIWrapper
 from langchain_community.utilities.serpapi import SerpAPIWrapper
+from langchain_core._api import deprecated
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import BasePromptTemplate
 from langchain_core.pydantic_v1 import Field
@@ -19,6 +20,7 @@
 from langchain.agents.utils import validate_tools_single_input
 
 
+@deprecated("0.1.0", alternative="create_self_ask_with_search", removal="0.2.0")
 class SelfAskWithSearchAgent(Agent):
     """Agent for the self-ask-with-search paper."""
 
@@ -61,6 +63,7 @@ def llm_prefix(self) -> str:
         return ""
 
 
+@deprecated("0.1.0", removal="0.2.0")
 class SelfAskWithSearchChain(AgentExecutor):
     """[Deprecated] Chain that does self-ask with search."""
 

libs/langchain/langchain/agents/structured_chat/base.py

@@ -1,6 +1,7 @@
 import re
 from typing import Any, List, Optional, Sequence, Tuple
 
+from langchain_core._api import deprecated
 from langchain_core.agents import AgentAction
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import BasePromptTemplate
@@ -27,6 +28,7 @@
 HUMAN_MESSAGE_TEMPLATE = "{input}\n\n{agent_scratchpad}"
 
 
+@deprecated("0.1.0", alternative="create_structured_chat_agent", removal="0.2.0")
 class StructuredChatAgent(Agent):
     """Structured Chat Agent."""
 

libs/langchain/langchain/agents/xml/base.py

@@ -1,5 +1,6 @@
 from typing import Any, List, Sequence, Tuple, Union
 
+from langchain_core._api import deprecated
 from langchain_core.agents import AgentAction, AgentFinish
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts.base import BasePromptTemplate
@@ -16,6 +17,7 @@
 from langchain.tools.render import render_text_description
 
 
+@deprecated("0.1.0", alternative="create_xml_agent", removal="0.2.0")
 class XMLAgent(BaseSingleActionAgent):
     """Agent that uses XML tags.