# langchain_core > Python package 📖 [View in docs](https://reference.langchain.com/python/langchain-core) ## Classes - [`AgentAction`](https://reference.langchain.com/python/langchain-core/agents/AgentAction) - [`AgentActionMessageLog`](https://reference.langchain.com/python/langchain-core/agents/AgentActionMessageLog) - [`AgentStep`](https://reference.langchain.com/python/langchain-core/agents/AgentStep) - [`AgentFinish`](https://reference.langchain.com/python/langchain-core/agents/AgentFinish) - [`BaseChatMessageHistory`](https://reference.langchain.com/python/langchain-core/chat_history/BaseChatMessageHistory) - [`InMemoryChatMessageHistory`](https://reference.langchain.com/python/langchain-core/chat_history/InMemoryChatMessageHistory) - [`LangSmithRetrieverParams`](https://reference.langchain.com/python/langchain-core/retrievers/LangSmithRetrieverParams) - [`BaseRetriever`](https://reference.langchain.com/python/langchain-core/retrievers/BaseRetriever) - [`BaseStore`](https://reference.langchain.com/python/langchain-core/stores/BaseStore) - [`InMemoryBaseStore`](https://reference.langchain.com/python/langchain-core/stores/InMemoryBaseStore) - [`InMemoryStore`](https://reference.langchain.com/python/langchain-core/stores/InMemoryStore) - [`InMemoryByteStore`](https://reference.langchain.com/python/langchain-core/stores/InMemoryByteStore) - [`InvalidKeyException`](https://reference.langchain.com/python/langchain-core/stores/InvalidKeyException) - [`ChatSession`](https://reference.langchain.com/python/langchain-core/chat_sessions/ChatSession) - [`BaseCache`](https://reference.langchain.com/python/langchain-core/caches/BaseCache) - [`InMemoryCache`](https://reference.langchain.com/python/langchain-core/caches/InMemoryCache) - [`LangChainException`](https://reference.langchain.com/python/langchain-core/exceptions/LangChainException) - [`TracerException`](https://reference.langchain.com/python/langchain-core/exceptions/TracerException) - [`OutputParserException`](https://reference.langchain.com/python/langchain-core/exceptions/OutputParserException) - [`ContextOverflowError`](https://reference.langchain.com/python/langchain-core/exceptions/ContextOverflowError) - [`ErrorCode`](https://reference.langchain.com/python/langchain-core/exceptions/ErrorCode) - [`Visitor`](https://reference.langchain.com/python/langchain-core/structured_query/Visitor) - [`Expr`](https://reference.langchain.com/python/langchain-core/structured_query/Expr) - [`Operator`](https://reference.langchain.com/python/langchain-core/structured_query/Operator) - [`Comparator`](https://reference.langchain.com/python/langchain-core/structured_query/Comparator) - [`FilterDirective`](https://reference.langchain.com/python/langchain-core/structured_query/FilterDirective) - [`Comparison`](https://reference.langchain.com/python/langchain-core/structured_query/Comparison) - [`Operation`](https://reference.langchain.com/python/langchain-core/structured_query/Operation) - [`StructuredQuery`](https://reference.langchain.com/python/langchain-core/structured_query/StructuredQuery) - [`BaseChatLoader`](https://reference.langchain.com/python/langchain-core/chat_loaders/BaseChatLoader) - [`BaseRateLimiter`](https://reference.langchain.com/python/langchain-core/rate_limiters/BaseRateLimiter) - [`InMemoryRateLimiter`](https://reference.langchain.com/python/langchain-core/rate_limiters/InMemoryRateLimiter) - [`PromptValue`](https://reference.langchain.com/python/langchain-core/prompt_values/PromptValue) - [`StringPromptValue`](https://reference.langchain.com/python/langchain-core/prompt_values/StringPromptValue) - [`ChatPromptValue`](https://reference.langchain.com/python/langchain-core/prompt_values/ChatPromptValue) - [`ImageURL`](https://reference.langchain.com/python/langchain-core/prompt_values/ImageURL) - [`ImagePromptValue`](https://reference.langchain.com/python/langchain-core/prompt_values/ImagePromptValue) - [`ChatPromptValueConcrete`](https://reference.langchain.com/python/langchain-core/prompt_values/ChatPromptValueConcrete) - [`ToolOutputMixin`](https://reference.langchain.com/python/langchain-core/messages/tool/ToolOutputMixin) - [`ToolMessage`](https://reference.langchain.com/python/langchain-core/messages/tool/ToolMessage) - [`ToolMessageChunk`](https://reference.langchain.com/python/langchain-core/messages/tool/ToolMessageChunk) - [`ToolCall`](https://reference.langchain.com/python/langchain-core/messages/tool/ToolCall) - [`ToolCallChunk`](https://reference.langchain.com/python/langchain-core/messages/tool/ToolCallChunk) - [`InputTokenDetails`](https://reference.langchain.com/python/langchain-core/messages/ai/InputTokenDetails) - [`OutputTokenDetails`](https://reference.langchain.com/python/langchain-core/messages/ai/OutputTokenDetails) - [`UsageMetadata`](https://reference.langchain.com/python/langchain-core/messages/ai/UsageMetadata) - [`AIMessage`](https://reference.langchain.com/python/langchain-core/messages/ai/AIMessage) - [`AIMessageChunk`](https://reference.langchain.com/python/langchain-core/messages/ai/AIMessageChunk) - [`Citation`](https://reference.langchain.com/python/langchain-core/messages/content/Citation) - [`NonStandardAnnotation`](https://reference.langchain.com/python/langchain-core/messages/content/NonStandardAnnotation) - [`TextContentBlock`](https://reference.langchain.com/python/langchain-core/messages/content/TextContentBlock) - [`ToolCall`](https://reference.langchain.com/python/langchain-core/messages/content/ToolCall) - [`ToolCallChunk`](https://reference.langchain.com/python/langchain-core/messages/content/ToolCallChunk) - [`InvalidToolCall`](https://reference.langchain.com/python/langchain-core/messages/content/InvalidToolCall) - [`ServerToolCall`](https://reference.langchain.com/python/langchain-core/messages/content/ServerToolCall) - [`ServerToolCallChunk`](https://reference.langchain.com/python/langchain-core/messages/content/ServerToolCallChunk) - [`ServerToolResult`](https://reference.langchain.com/python/langchain-core/messages/content/ServerToolResult) - [`ReasoningContentBlock`](https://reference.langchain.com/python/langchain-core/messages/content/ReasoningContentBlock) - [`ImageContentBlock`](https://reference.langchain.com/python/langchain-core/messages/content/ImageContentBlock) - [`VideoContentBlock`](https://reference.langchain.com/python/langchain-core/messages/content/VideoContentBlock) - [`AudioContentBlock`](https://reference.langchain.com/python/langchain-core/messages/content/AudioContentBlock) - [`PlainTextContentBlock`](https://reference.langchain.com/python/langchain-core/messages/content/PlainTextContentBlock) - [`FileContentBlock`](https://reference.langchain.com/python/langchain-core/messages/content/FileContentBlock) - [`NonStandardContentBlock`](https://reference.langchain.com/python/langchain-core/messages/content/NonStandardContentBlock) - [`TextAccessor`](https://reference.langchain.com/python/langchain-core/messages/base/TextAccessor) - [`BaseMessage`](https://reference.langchain.com/python/langchain-core/messages/base/BaseMessage) - [`BaseMessageChunk`](https://reference.langchain.com/python/langchain-core/messages/base/BaseMessageChunk) - [`RemoveMessage`](https://reference.langchain.com/python/langchain-core/messages/modifier/RemoveMessage) - [`SystemMessage`](https://reference.langchain.com/python/langchain-core/messages/system/SystemMessage) - [`SystemMessageChunk`](https://reference.langchain.com/python/langchain-core/messages/system/SystemMessageChunk) - [`FunctionMessage`](https://reference.langchain.com/python/langchain-core/messages/function/FunctionMessage) - [`FunctionMessageChunk`](https://reference.langchain.com/python/langchain-core/messages/function/FunctionMessageChunk) - [`HumanMessage`](https://reference.langchain.com/python/langchain-core/messages/human/HumanMessage) - [`HumanMessageChunk`](https://reference.langchain.com/python/langchain-core/messages/human/HumanMessageChunk) - [`ChatMessage`](https://reference.langchain.com/python/langchain-core/messages/chat/ChatMessage) - [`ChatMessageChunk`](https://reference.langchain.com/python/langchain-core/messages/chat/ChatMessageChunk) - [`LangSmithLoader`](https://reference.langchain.com/python/langchain-core/document_loaders/langsmith/LangSmithLoader) - [`BaseLoader`](https://reference.langchain.com/python/langchain-core/document_loaders/base/BaseLoader) - [`BaseBlobParser`](https://reference.langchain.com/python/langchain-core/document_loaders/base/BaseBlobParser) - [`BlobLoader`](https://reference.langchain.com/python/langchain-core/document_loaders/blob_loaders/BlobLoader) - [`BasePromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/base/BasePromptTemplate) - [`FewShotPromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/few_shot/FewShotPromptTemplate) - [`FewShotChatMessagePromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/few_shot/FewShotChatMessagePromptTemplate) - [`FewShotPromptWithTemplates`](https://reference.langchain.com/python/langchain-core/prompts/few_shot_with_templates/FewShotPromptWithTemplates) - [`BaseMessagePromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/message/BaseMessagePromptTemplate) - [`ImagePromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/image/ImagePromptTemplate) - [`StructuredPrompt`](https://reference.langchain.com/python/langchain-core/prompts/structured/StructuredPrompt) - [`StringPromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/string/StringPromptTemplate) - [`PromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/prompt/PromptTemplate) - [`MessagesPlaceholder`](https://reference.langchain.com/python/langchain-core/prompts/chat/MessagesPlaceholder) - [`BaseStringMessagePromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/chat/BaseStringMessagePromptTemplate) - [`ChatMessagePromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/chat/ChatMessagePromptTemplate) - [`HumanMessagePromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/chat/HumanMessagePromptTemplate) - [`AIMessagePromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/chat/AIMessagePromptTemplate) - [`SystemMessagePromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/chat/SystemMessagePromptTemplate) - [`BaseChatPromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/chat/BaseChatPromptTemplate) - [`ChatPromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/chat/ChatPromptTemplate) - [`DictPromptTemplate`](https://reference.langchain.com/python/langchain-core/prompts/dict/DictPromptTemplate) - [`LangChainDeprecationWarning`](https://reference.langchain.com/python/langchain-core/_api/deprecation/LangChainDeprecationWarning) - [`LangChainPendingDeprecationWarning`](https://reference.langchain.com/python/langchain-core/_api/deprecation/LangChainPendingDeprecationWarning) - [`LangChainBetaWarning`](https://reference.langchain.com/python/langchain-core/_api/beta_decorator/LangChainBetaWarning) - [`BaseMedia`](https://reference.langchain.com/python/langchain-core/documents/base/BaseMedia) - [`Blob`](https://reference.langchain.com/python/langchain-core/documents/base/Blob) - [`Document`](https://reference.langchain.com/python/langchain-core/documents/base/Document) - [`BaseDocumentTransformer`](https://reference.langchain.com/python/langchain-core/documents/transformers/BaseDocumentTransformer) - [`BaseDocumentCompressor`](https://reference.langchain.com/python/langchain-core/documents/compressor/BaseDocumentCompressor) - [`Embeddings`](https://reference.langchain.com/python/langchain-core/embeddings/embeddings/Embeddings) - [`FakeEmbeddings`](https://reference.langchain.com/python/langchain-core/embeddings/fake/FakeEmbeddings) - [`DeterministicFakeEmbedding`](https://reference.langchain.com/python/langchain-core/embeddings/fake/DeterministicFakeEmbedding) - [`InMemoryVectorStore`](https://reference.langchain.com/python/langchain-core/vectorstores/in_memory/InMemoryVectorStore) - [`VectorStore`](https://reference.langchain.com/python/langchain-core/vectorstores/base/VectorStore) - [`VectorStoreRetriever`](https://reference.langchain.com/python/langchain-core/vectorstores/base/VectorStoreRetriever) - [`EvaluatorCallbackHandler`](https://reference.langchain.com/python/langchain-core/tracers/evaluation/EvaluatorCallbackHandler) - [`RunCollectorCallbackHandler`](https://reference.langchain.com/python/langchain-core/tracers/run_collector/RunCollectorCallbackHandler) - [`BaseTracer`](https://reference.langchain.com/python/langchain-core/tracers/base/BaseTracer) - [`AsyncBaseTracer`](https://reference.langchain.com/python/langchain-core/tracers/base/AsyncBaseTracer) - [`RunInfo`](https://reference.langchain.com/python/langchain-core/tracers/event_stream/RunInfo) - [`LogEntry`](https://reference.langchain.com/python/langchain-core/tracers/log_stream/LogEntry) - [`RunState`](https://reference.langchain.com/python/langchain-core/tracers/log_stream/RunState) - [`RunLogPatch`](https://reference.langchain.com/python/langchain-core/tracers/log_stream/RunLogPatch) - [`RunLog`](https://reference.langchain.com/python/langchain-core/tracers/log_stream/RunLog) - [`LogStreamCallbackHandler`](https://reference.langchain.com/python/langchain-core/tracers/log_stream/LogStreamCallbackHandler) - [`RootListenersTracer`](https://reference.langchain.com/python/langchain-core/tracers/root_listeners/RootListenersTracer) - [`AsyncRootListenersTracer`](https://reference.langchain.com/python/langchain-core/tracers/root_listeners/AsyncRootListenersTracer) - [`FunctionCallbackHandler`](https://reference.langchain.com/python/langchain-core/tracers/stdout/FunctionCallbackHandler) - [`ConsoleCallbackHandler`](https://reference.langchain.com/python/langchain-core/tracers/stdout/ConsoleCallbackHandler) - [`LangChainTracer`](https://reference.langchain.com/python/langchain-core/tracers/langchain/LangChainTracer) - [`InMemoryDocumentIndex`](https://reference.langchain.com/python/langchain-core/indexing/in_memory/InMemoryDocumentIndex) - [`RecordManager`](https://reference.langchain.com/python/langchain-core/indexing/base/RecordManager) - [`InMemoryRecordManager`](https://reference.langchain.com/python/langchain-core/indexing/base/InMemoryRecordManager) - [`UpsertResponse`](https://reference.langchain.com/python/langchain-core/indexing/base/UpsertResponse) - [`DeleteResponse`](https://reference.langchain.com/python/langchain-core/indexing/base/DeleteResponse) - [`DocumentIndex`](https://reference.langchain.com/python/langchain-core/indexing/base/DocumentIndex) - [`IndexingException`](https://reference.langchain.com/python/langchain-core/indexing/api/IndexingException) - [`IndexingResult`](https://reference.langchain.com/python/langchain-core/indexing/api/IndexingResult) - [`LengthBasedExampleSelector`](https://reference.langchain.com/python/langchain-core/example_selectors/length_based/LengthBasedExampleSelector) - [`BaseExampleSelector`](https://reference.langchain.com/python/langchain-core/example_selectors/base/BaseExampleSelector) - [`SemanticSimilarityExampleSelector`](https://reference.langchain.com/python/langchain-core/example_selectors/semantic_similarity/SemanticSimilarityExampleSelector) - [`MaxMarginalRelevanceExampleSelector`](https://reference.langchain.com/python/langchain-core/example_selectors/semantic_similarity/MaxMarginalRelevanceExampleSelector) - [`NoLock`](https://reference.langchain.com/python/langchain-core/utils/aiter/NoLock) - [`Tee`](https://reference.langchain.com/python/langchain-core/utils/aiter/Tee) - [`aclosing`](https://reference.langchain.com/python/langchain-core/utils/aiter/aclosing) - [`NoLock`](https://reference.langchain.com/python/langchain-core/utils/iter/NoLock) - [`Tee`](https://reference.langchain.com/python/langchain-core/utils/iter/Tee) - [`StrictFormatter`](https://reference.langchain.com/python/langchain-core/utils/formatting/StrictFormatter) - [`ChevronError`](https://reference.langchain.com/python/langchain-core/utils/mustache/ChevronError) - [`FunctionDescription`](https://reference.langchain.com/python/langchain-core/utils/function_calling/FunctionDescription) - [`ToolDescription`](https://reference.langchain.com/python/langchain-core/utils/function_calling/ToolDescription) - [`RetrieverManagerMixin`](https://reference.langchain.com/python/langchain-core/callbacks/base/RetrieverManagerMixin) - [`LLMManagerMixin`](https://reference.langchain.com/python/langchain-core/callbacks/base/LLMManagerMixin) - [`ChainManagerMixin`](https://reference.langchain.com/python/langchain-core/callbacks/base/ChainManagerMixin) - [`ToolManagerMixin`](https://reference.langchain.com/python/langchain-core/callbacks/base/ToolManagerMixin) - [`CallbackManagerMixin`](https://reference.langchain.com/python/langchain-core/callbacks/base/CallbackManagerMixin) - [`RunManagerMixin`](https://reference.langchain.com/python/langchain-core/callbacks/base/RunManagerMixin) - [`BaseCallbackHandler`](https://reference.langchain.com/python/langchain-core/callbacks/base/BaseCallbackHandler) - [`AsyncCallbackHandler`](https://reference.langchain.com/python/langchain-core/callbacks/base/AsyncCallbackHandler) - [`BaseCallbackManager`](https://reference.langchain.com/python/langchain-core/callbacks/base/BaseCallbackManager) - [`StdOutCallbackHandler`](https://reference.langchain.com/python/langchain-core/callbacks/stdout/StdOutCallbackHandler) - [`FileCallbackHandler`](https://reference.langchain.com/python/langchain-core/callbacks/file/FileCallbackHandler) - [`BaseRunManager`](https://reference.langchain.com/python/langchain-core/callbacks/manager/BaseRunManager) - [`RunManager`](https://reference.langchain.com/python/langchain-core/callbacks/manager/RunManager) - [`ParentRunManager`](https://reference.langchain.com/python/langchain-core/callbacks/manager/ParentRunManager) - [`AsyncRunManager`](https://reference.langchain.com/python/langchain-core/callbacks/manager/AsyncRunManager) - [`AsyncParentRunManager`](https://reference.langchain.com/python/langchain-core/callbacks/manager/AsyncParentRunManager) - [`CallbackManagerForLLMRun`](https://reference.langchain.com/python/langchain-core/callbacks/manager/CallbackManagerForLLMRun) - [`AsyncCallbackManagerForLLMRun`](https://reference.langchain.com/python/langchain-core/callbacks/manager/AsyncCallbackManagerForLLMRun) - [`CallbackManagerForChainRun`](https://reference.langchain.com/python/langchain-core/callbacks/manager/CallbackManagerForChainRun) - [`AsyncCallbackManagerForChainRun`](https://reference.langchain.com/python/langchain-core/callbacks/manager/AsyncCallbackManagerForChainRun) - [`CallbackManagerForToolRun`](https://reference.langchain.com/python/langchain-core/callbacks/manager/CallbackManagerForToolRun) - [`AsyncCallbackManagerForToolRun`](https://reference.langchain.com/python/langchain-core/callbacks/manager/AsyncCallbackManagerForToolRun) - [`CallbackManagerForRetrieverRun`](https://reference.langchain.com/python/langchain-core/callbacks/manager/CallbackManagerForRetrieverRun) - [`AsyncCallbackManagerForRetrieverRun`](https://reference.langchain.com/python/langchain-core/callbacks/manager/AsyncCallbackManagerForRetrieverRun) - [`CallbackManager`](https://reference.langchain.com/python/langchain-core/callbacks/manager/CallbackManager) - [`CallbackManagerForChainGroup`](https://reference.langchain.com/python/langchain-core/callbacks/manager/CallbackManagerForChainGroup) - [`AsyncCallbackManager`](https://reference.langchain.com/python/langchain-core/callbacks/manager/AsyncCallbackManager) - [`AsyncCallbackManagerForChainGroup`](https://reference.langchain.com/python/langchain-core/callbacks/manager/AsyncCallbackManagerForChainGroup) - [`StreamingStdOutCallbackHandler`](https://reference.langchain.com/python/langchain-core/callbacks/streaming_stdout/StreamingStdOutCallbackHandler) - [`UsageMetadataCallbackHandler`](https://reference.langchain.com/python/langchain-core/callbacks/usage/UsageMetadataCallbackHandler) - [`ParsedDataUri`](https://reference.langchain.com/python/langchain-core/language_models/_utils/ParsedDataUri) - [`BaseChatModel`](https://reference.langchain.com/python/langchain-core/language_models/chat_models/BaseChatModel) - [`SimpleChatModel`](https://reference.langchain.com/python/langchain-core/language_models/chat_models/SimpleChatModel) - [`FakeMessagesListChatModel`](https://reference.langchain.com/python/langchain-core/language_models/fake_chat_models/FakeMessagesListChatModel) - [`FakeListChatModelError`](https://reference.langchain.com/python/langchain-core/language_models/fake_chat_models/FakeListChatModelError) - [`FakeListChatModel`](https://reference.langchain.com/python/langchain-core/language_models/fake_chat_models/FakeListChatModel) - [`FakeChatModel`](https://reference.langchain.com/python/langchain-core/language_models/fake_chat_models/FakeChatModel) - [`GenericFakeChatModel`](https://reference.langchain.com/python/langchain-core/language_models/fake_chat_models/GenericFakeChatModel) - [`ParrotFakeChatModel`](https://reference.langchain.com/python/langchain-core/language_models/fake_chat_models/ParrotFakeChatModel) - [`BaseLLM`](https://reference.langchain.com/python/langchain-core/language_models/llms/BaseLLM) - [`LLM`](https://reference.langchain.com/python/langchain-core/language_models/llms/LLM) - [`LangSmithParams`](https://reference.langchain.com/python/langchain-core/language_models/base/LangSmithParams) - [`BaseLanguageModel`](https://reference.langchain.com/python/langchain-core/language_models/base/BaseLanguageModel) - [`FakeListLLM`](https://reference.langchain.com/python/langchain-core/language_models/fake/FakeListLLM) - [`FakeListLLMError`](https://reference.langchain.com/python/langchain-core/language_models/fake/FakeListLLMError) - [`FakeStreamingListLLM`](https://reference.langchain.com/python/langchain-core/language_models/fake/FakeStreamingListLLM) - [`ModelProfile`](https://reference.langchain.com/python/langchain-core/language_models/model_profile/ModelProfile) - [`ChatResult`](https://reference.langchain.com/python/langchain-core/outputs/chat_result/ChatResult) - [`LLMResult`](https://reference.langchain.com/python/langchain-core/outputs/llm_result/LLMResult) - [`RunInfo`](https://reference.langchain.com/python/langchain-core/outputs/run_info/RunInfo) - [`Generation`](https://reference.langchain.com/python/langchain-core/outputs/generation/Generation) - [`GenerationChunk`](https://reference.langchain.com/python/langchain-core/outputs/generation/GenerationChunk) - [`ChatGeneration`](https://reference.langchain.com/python/langchain-core/outputs/chat_generation/ChatGeneration) - [`ChatGenerationChunk`](https://reference.langchain.com/python/langchain-core/outputs/chat_generation/ChatGenerationChunk) - [`BaseLLMOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/base/BaseLLMOutputParser) - [`BaseGenerationOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/base/BaseGenerationOutputParser) - [`BaseOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/base/BaseOutputParser) - [`ListOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/list/ListOutputParser) - [`CommaSeparatedListOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/list/CommaSeparatedListOutputParser) - [`NumberedListOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/list/NumberedListOutputParser) - [`MarkdownListOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/list/MarkdownListOutputParser) - [`JsonOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/json/JsonOutputParser) - [`JsonOutputToolsParser`](https://reference.langchain.com/python/langchain-core/output_parsers/openai_tools/JsonOutputToolsParser) - [`JsonOutputKeyToolsParser`](https://reference.langchain.com/python/langchain-core/output_parsers/openai_tools/JsonOutputKeyToolsParser) - [`PydanticToolsParser`](https://reference.langchain.com/python/langchain-core/output_parsers/openai_tools/PydanticToolsParser) - [`StrOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/string/StrOutputParser) - [`BaseTransformOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/transform/BaseTransformOutputParser) - [`BaseCumulativeTransformOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/transform/BaseCumulativeTransformOutputParser) - [`PydanticOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/pydantic/PydanticOutputParser) - [`OutputFunctionsParser`](https://reference.langchain.com/python/langchain-core/output_parsers/openai_functions/OutputFunctionsParser) - [`JsonOutputFunctionsParser`](https://reference.langchain.com/python/langchain-core/output_parsers/openai_functions/JsonOutputFunctionsParser) - [`JsonKeyOutputFunctionsParser`](https://reference.langchain.com/python/langchain-core/output_parsers/openai_functions/JsonKeyOutputFunctionsParser) - [`PydanticOutputFunctionsParser`](https://reference.langchain.com/python/langchain-core/output_parsers/openai_functions/PydanticOutputFunctionsParser) - [`PydanticAttrOutputFunctionsParser`](https://reference.langchain.com/python/langchain-core/output_parsers/openai_functions/PydanticAttrOutputFunctionsParser) - [`XMLOutputParser`](https://reference.langchain.com/python/langchain-core/output_parsers/xml/XMLOutputParser) - [`RunnableWithFallbacks`](https://reference.langchain.com/python/langchain-core/runnables/fallbacks/RunnableWithFallbacks) - [`Stringifiable`](https://reference.langchain.com/python/langchain-core/runnables/graph/Stringifiable) - [`LabelsDict`](https://reference.langchain.com/python/langchain-core/runnables/graph/LabelsDict) - [`Edge`](https://reference.langchain.com/python/langchain-core/runnables/graph/Edge) - [`Node`](https://reference.langchain.com/python/langchain-core/runnables/graph/Node) - [`Branch`](https://reference.langchain.com/python/langchain-core/runnables/graph/Branch) - [`CurveStyle`](https://reference.langchain.com/python/langchain-core/runnables/graph/CurveStyle) - [`NodeStyles`](https://reference.langchain.com/python/langchain-core/runnables/graph/NodeStyles) - [`MermaidDrawMethod`](https://reference.langchain.com/python/langchain-core/runnables/graph/MermaidDrawMethod) - [`Graph`](https://reference.langchain.com/python/langchain-core/runnables/graph/Graph) - [`Runnable`](https://reference.langchain.com/python/langchain-core/runnables/base/Runnable) - [`RunnableSerializable`](https://reference.langchain.com/python/langchain-core/runnables/base/RunnableSerializable) - [`RunnableSequence`](https://reference.langchain.com/python/langchain-core/runnables/base/RunnableSequence) - [`RunnableParallel`](https://reference.langchain.com/python/langchain-core/runnables/base/RunnableParallel) - [`RunnableGenerator`](https://reference.langchain.com/python/langchain-core/runnables/base/RunnableGenerator) - [`RunnableLambda`](https://reference.langchain.com/python/langchain-core/runnables/base/RunnableLambda) - [`RunnableEachBase`](https://reference.langchain.com/python/langchain-core/runnables/base/RunnableEachBase) - [`RunnableEach`](https://reference.langchain.com/python/langchain-core/runnables/base/RunnableEach) - [`RunnableBindingBase`](https://reference.langchain.com/python/langchain-core/runnables/base/RunnableBindingBase) - [`RunnableBinding`](https://reference.langchain.com/python/langchain-core/runnables/base/RunnableBinding) - [`VertexViewer`](https://reference.langchain.com/python/langchain-core/runnables/graph_ascii/VertexViewer) - [`AsciiCanvas`](https://reference.langchain.com/python/langchain-core/runnables/graph_ascii/AsciiCanvas) - [`EventData`](https://reference.langchain.com/python/langchain-core/runnables/schema/EventData) - [`BaseStreamEvent`](https://reference.langchain.com/python/langchain-core/runnables/schema/BaseStreamEvent) - [`StandardStreamEvent`](https://reference.langchain.com/python/langchain-core/runnables/schema/StandardStreamEvent) - [`CustomStreamEvent`](https://reference.langchain.com/python/langchain-core/runnables/schema/CustomStreamEvent) - [`PngDrawer`](https://reference.langchain.com/python/langchain-core/runnables/graph_png/PngDrawer) - [`IsLocalDict`](https://reference.langchain.com/python/langchain-core/runnables/utils/IsLocalDict) - [`IsFunctionArgDict`](https://reference.langchain.com/python/langchain-core/runnables/utils/IsFunctionArgDict) - [`NonLocals`](https://reference.langchain.com/python/langchain-core/runnables/utils/NonLocals) - [`FunctionNonLocals`](https://reference.langchain.com/python/langchain-core/runnables/utils/FunctionNonLocals) - [`GetLambdaSource`](https://reference.langchain.com/python/langchain-core/runnables/utils/GetLambdaSource) - [`AddableDict`](https://reference.langchain.com/python/langchain-core/runnables/utils/AddableDict) - [`SupportsAdd`](https://reference.langchain.com/python/langchain-core/runnables/utils/SupportsAdd) - [`ConfigurableField`](https://reference.langchain.com/python/langchain-core/runnables/utils/ConfigurableField) - [`ConfigurableFieldSingleOption`](https://reference.langchain.com/python/langchain-core/runnables/utils/ConfigurableFieldSingleOption) - [`ConfigurableFieldMultiOption`](https://reference.langchain.com/python/langchain-core/runnables/utils/ConfigurableFieldMultiOption) - [`ConfigurableFieldSpec`](https://reference.langchain.com/python/langchain-core/runnables/utils/ConfigurableFieldSpec) - [`RunnableWithMessageHistory`](https://reference.langchain.com/python/langchain-core/runnables/history/RunnableWithMessageHistory) - [`RunnableBranch`](https://reference.langchain.com/python/langchain-core/runnables/branch/RunnableBranch) - [`RunnablePassthrough`](https://reference.langchain.com/python/langchain-core/runnables/passthrough/RunnablePassthrough) - [`RunnableAssign`](https://reference.langchain.com/python/langchain-core/runnables/passthrough/RunnableAssign) - [`RunnablePick`](https://reference.langchain.com/python/langchain-core/runnables/passthrough/RunnablePick) - [`EmptyDict`](https://reference.langchain.com/python/langchain-core/runnables/config/EmptyDict) - [`RunnableConfig`](https://reference.langchain.com/python/langchain-core/runnables/config/RunnableConfig) - [`ContextThreadPoolExecutor`](https://reference.langchain.com/python/langchain-core/runnables/config/ContextThreadPoolExecutor) - [`ExponentialJitterParams`](https://reference.langchain.com/python/langchain-core/runnables/retry/ExponentialJitterParams) - [`RunnableRetry`](https://reference.langchain.com/python/langchain-core/runnables/retry/RunnableRetry) - [`DynamicRunnable`](https://reference.langchain.com/python/langchain-core/runnables/configurable/DynamicRunnable) - [`RunnableConfigurableFields`](https://reference.langchain.com/python/langchain-core/runnables/configurable/RunnableConfigurableFields) - [`StrEnum`](https://reference.langchain.com/python/langchain-core/runnables/configurable/StrEnum) - [`RunnableConfigurableAlternatives`](https://reference.langchain.com/python/langchain-core/runnables/configurable/RunnableConfigurableAlternatives) - [`RouterInput`](https://reference.langchain.com/python/langchain-core/runnables/router/RouterInput) - [`RouterRunnable`](https://reference.langchain.com/python/langchain-core/runnables/router/RouterRunnable) - [`Reviver`](https://reference.langchain.com/python/langchain-core/load/load/Reviver) - [`BaseSerialized`](https://reference.langchain.com/python/langchain-core/load/serializable/BaseSerialized) - [`SerializedConstructor`](https://reference.langchain.com/python/langchain-core/load/serializable/SerializedConstructor) - [`SerializedSecret`](https://reference.langchain.com/python/langchain-core/load/serializable/SerializedSecret) - [`SerializedNotImplemented`](https://reference.langchain.com/python/langchain-core/load/serializable/SerializedNotImplemented) - [`Serializable`](https://reference.langchain.com/python/langchain-core/load/serializable/Serializable) - [`SchemaAnnotationError`](https://reference.langchain.com/python/langchain-core/tools/base/SchemaAnnotationError) - [`ToolException`](https://reference.langchain.com/python/langchain-core/tools/base/ToolException) - [`BaseTool`](https://reference.langchain.com/python/langchain-core/tools/base/BaseTool) - [`InjectedToolArg`](https://reference.langchain.com/python/langchain-core/tools/base/InjectedToolArg) - [`InjectedToolCallId`](https://reference.langchain.com/python/langchain-core/tools/base/InjectedToolCallId) - [`BaseToolkit`](https://reference.langchain.com/python/langchain-core/tools/base/BaseToolkit) - [`Tool`](https://reference.langchain.com/python/langchain-core/tools/simple/Tool) - [`StructuredTool`](https://reference.langchain.com/python/langchain-core/tools/structured/StructuredTool) - [`RetrieverInput`](https://reference.langchain.com/python/langchain-core/tools/retriever/RetrieverInput) ## Functions - [`print_sys_info()`](https://reference.langchain.com/python/langchain-core/sys_info/print_sys_info) - [`import_attr()`](https://reference.langchain.com/python/langchain-core/_import_utils/import_attr) - [`set_verbose()`](https://reference.langchain.com/python/langchain-core/globals/set_verbose) - [`get_verbose()`](https://reference.langchain.com/python/langchain-core/globals/get_verbose) - [`set_debug()`](https://reference.langchain.com/python/langchain-core/globals/set_debug) - [`get_debug()`](https://reference.langchain.com/python/langchain-core/globals/get_debug) - [`set_llm_cache()`](https://reference.langchain.com/python/langchain-core/globals/set_llm_cache) - [`get_llm_cache()`](https://reference.langchain.com/python/langchain-core/globals/get_llm_cache) - [`create_message()`](https://reference.langchain.com/python/langchain-core/exceptions/create_message) - [`get_runtime_environment()`](https://reference.langchain.com/python/langchain-core/env/get_runtime_environment) - [`tool_call()`](https://reference.langchain.com/python/langchain-core/messages/tool/tool_call) - [`tool_call_chunk()`](https://reference.langchain.com/python/langchain-core/messages/tool/tool_call_chunk) - [`invalid_tool_call()`](https://reference.langchain.com/python/langchain-core/messages/tool/invalid_tool_call) - [`default_tool_parser()`](https://reference.langchain.com/python/langchain-core/messages/tool/default_tool_parser) - [`default_tool_chunk_parser()`](https://reference.langchain.com/python/langchain-core/messages/tool/default_tool_chunk_parser) - [`add_ai_message_chunks()`](https://reference.langchain.com/python/langchain-core/messages/ai/add_ai_message_chunks) - [`add_usage()`](https://reference.langchain.com/python/langchain-core/messages/ai/add_usage) - [`subtract_usage()`](https://reference.langchain.com/python/langchain-core/messages/ai/subtract_usage) - [`is_data_content_block()`](https://reference.langchain.com/python/langchain-core/messages/content/is_data_content_block) - [`create_text_block()`](https://reference.langchain.com/python/langchain-core/messages/content/create_text_block) - [`create_image_block()`](https://reference.langchain.com/python/langchain-core/messages/content/create_image_block) - [`create_video_block()`](https://reference.langchain.com/python/langchain-core/messages/content/create_video_block) - [`create_audio_block()`](https://reference.langchain.com/python/langchain-core/messages/content/create_audio_block) - [`create_file_block()`](https://reference.langchain.com/python/langchain-core/messages/content/create_file_block) - [`create_plaintext_block()`](https://reference.langchain.com/python/langchain-core/messages/content/create_plaintext_block) - [`create_tool_call()`](https://reference.langchain.com/python/langchain-core/messages/content/create_tool_call) - [`create_reasoning_block()`](https://reference.langchain.com/python/langchain-core/messages/content/create_reasoning_block) - [`create_citation()`](https://reference.langchain.com/python/langchain-core/messages/content/create_citation) - [`create_non_standard_block()`](https://reference.langchain.com/python/langchain-core/messages/content/create_non_standard_block) - [`merge_content()`](https://reference.langchain.com/python/langchain-core/messages/base/merge_content) - [`message_to_dict()`](https://reference.langchain.com/python/langchain-core/messages/base/message_to_dict) - [`messages_to_dict()`](https://reference.langchain.com/python/langchain-core/messages/base/messages_to_dict) - [`get_msg_title_repr()`](https://reference.langchain.com/python/langchain-core/messages/base/get_msg_title_repr) - [`get_buffer_string()`](https://reference.langchain.com/python/langchain-core/messages/utils/get_buffer_string) - [`messages_from_dict()`](https://reference.langchain.com/python/langchain-core/messages/utils/messages_from_dict) - [`message_chunk_to_message()`](https://reference.langchain.com/python/langchain-core/messages/utils/message_chunk_to_message) - [`convert_to_messages()`](https://reference.langchain.com/python/langchain-core/messages/utils/convert_to_messages) - [`filter_messages()`](https://reference.langchain.com/python/langchain-core/messages/utils/filter_messages) - [`merge_message_runs()`](https://reference.langchain.com/python/langchain-core/messages/utils/merge_message_runs) - [`trim_messages()`](https://reference.langchain.com/python/langchain-core/messages/utils/trim_messages) - [`convert_to_openai_messages()`](https://reference.langchain.com/python/langchain-core/messages/utils/convert_to_openai_messages) - [`count_tokens_approximately()`](https://reference.langchain.com/python/langchain-core/messages/utils/count_tokens_approximately) - [`register_translator()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/register_translator) - [`get_translator()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/get_translator) - [`translate_content()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/groq/translate_content) - [`translate_content_chunk()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/groq/translate_content_chunk) - [`translate_content()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/bedrock_converse/translate_content) - [`translate_content_chunk()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/bedrock_converse/translate_content_chunk) - [`convert_to_openai_image_block()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/openai/convert_to_openai_image_block) - [`convert_to_openai_data_block()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/openai/convert_to_openai_data_block) - [`translate_content()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/openai/translate_content) - [`translate_content_chunk()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/openai/translate_content_chunk) - [`translate_grounding_metadata_to_citations()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/google_genai/translate_grounding_metadata_to_citations) - [`translate_content()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/google_genai/translate_content) - [`translate_content_chunk()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/google_genai/translate_content_chunk) - [`translate_content()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/bedrock/translate_content) - [`translate_content_chunk()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/bedrock/translate_content_chunk) - [`translate_content()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/anthropic/translate_content) - [`translate_content_chunk()`](https://reference.langchain.com/python/langchain-core/messages/block_translators/anthropic/translate_content_chunk) - [`load_prompt_from_config()`](https://reference.langchain.com/python/langchain-core/prompts/loading/load_prompt_from_config) - [`load_prompt()`](https://reference.langchain.com/python/langchain-core/prompts/loading/load_prompt) - [`format_document()`](https://reference.langchain.com/python/langchain-core/prompts/base/format_document) - [`aformat_document()`](https://reference.langchain.com/python/langchain-core/prompts/base/aformat_document) - [`jinja2_formatter()`](https://reference.langchain.com/python/langchain-core/prompts/string/jinja2_formatter) - [`validate_jinja2()`](https://reference.langchain.com/python/langchain-core/prompts/string/validate_jinja2) - [`mustache_formatter()`](https://reference.langchain.com/python/langchain-core/prompts/string/mustache_formatter) - [`mustache_template_vars()`](https://reference.langchain.com/python/langchain-core/prompts/string/mustache_template_vars) - [`mustache_schema()`](https://reference.langchain.com/python/langchain-core/prompts/string/mustache_schema) - [`check_valid_template()`](https://reference.langchain.com/python/langchain-core/prompts/string/check_valid_template) - [`get_template_variables()`](https://reference.langchain.com/python/langchain-core/prompts/string/get_template_variables) - [`is_subsequence()`](https://reference.langchain.com/python/langchain-core/prompts/string/is_subsequence) - [`is_caller_internal()`](https://reference.langchain.com/python/langchain-core/_api/internal/is_caller_internal) - [`deprecated()`](https://reference.langchain.com/python/langchain-core/_api/deprecation/deprecated) - [`suppress_langchain_deprecation_warning()`](https://reference.langchain.com/python/langchain-core/_api/deprecation/suppress_langchain_deprecation_warning) - [`warn_deprecated()`](https://reference.langchain.com/python/langchain-core/_api/deprecation/warn_deprecated) - [`surface_langchain_deprecation_warnings()`](https://reference.langchain.com/python/langchain-core/_api/deprecation/surface_langchain_deprecation_warnings) - [`rename_parameter()`](https://reference.langchain.com/python/langchain-core/_api/deprecation/rename_parameter) - [`beta()`](https://reference.langchain.com/python/langchain-core/_api/beta_decorator/beta) - [`suppress_langchain_beta_warning()`](https://reference.langchain.com/python/langchain-core/_api/beta_decorator/suppress_langchain_beta_warning) - [`warn_beta()`](https://reference.langchain.com/python/langchain-core/_api/beta_decorator/warn_beta) - [`surface_langchain_beta_warnings()`](https://reference.langchain.com/python/langchain-core/_api/beta_decorator/surface_langchain_beta_warnings) - [`get_relative_path()`](https://reference.langchain.com/python/langchain-core/_api/path/get_relative_path) - [`as_import_path()`](https://reference.langchain.com/python/langchain-core/_api/path/as_import_path) - [`maximal_marginal_relevance()`](https://reference.langchain.com/python/langchain-core/vectorstores/utils/maximal_marginal_relevance) - [`wait_for_all_evaluators()`](https://reference.langchain.com/python/langchain-core/tracers/evaluation/wait_for_all_evaluators) - [`try_json_stringify()`](https://reference.langchain.com/python/langchain-core/tracers/stdout/try_json_stringify) - [`elapsed()`](https://reference.langchain.com/python/langchain-core/tracers/stdout/elapsed) - [`tracing_v2_enabled()`](https://reference.langchain.com/python/langchain-core/tracers/context/tracing_v2_enabled) - [`collect_runs()`](https://reference.langchain.com/python/langchain-core/tracers/context/collect_runs) - [`register_configure_hook()`](https://reference.langchain.com/python/langchain-core/tracers/context/register_configure_hook) - [`run_to_dict()`](https://reference.langchain.com/python/langchain-core/tracers/_compat/run_to_dict) - [`run_copy()`](https://reference.langchain.com/python/langchain-core/tracers/_compat/run_copy) - [`run_construct()`](https://reference.langchain.com/python/langchain-core/tracers/_compat/run_construct) - [`pydantic_to_dict()`](https://reference.langchain.com/python/langchain-core/tracers/_compat/pydantic_to_dict) - [`pydantic_copy()`](https://reference.langchain.com/python/langchain-core/tracers/_compat/pydantic_copy) - [`log_error_once()`](https://reference.langchain.com/python/langchain-core/tracers/langchain/log_error_once) - [`wait_for_all_tracers()`](https://reference.langchain.com/python/langchain-core/tracers/langchain/wait_for_all_tracers) - [`get_client()`](https://reference.langchain.com/python/langchain-core/tracers/langchain/get_client) - [`index()`](https://reference.langchain.com/python/langchain-core/indexing/api/index) - [`aindex()`](https://reference.langchain.com/python/langchain-core/indexing/api/aindex) - [`sorted_values()`](https://reference.langchain.com/python/langchain-core/example_selectors/semantic_similarity/sorted_values) - [`dereference_refs()`](https://reference.langchain.com/python/langchain-core/utils/json_schema/dereference_refs) - [`find_all_links()`](https://reference.langchain.com/python/langchain-core/utils/html/find_all_links) - [`extract_sub_links()`](https://reference.langchain.com/python/langchain-core/utils/html/extract_sub_links) - [`xor_args()`](https://reference.langchain.com/python/langchain-core/utils/utils/xor_args) - [`raise_for_status_with_text()`](https://reference.langchain.com/python/langchain-core/utils/utils/raise_for_status_with_text) - [`mock_now()`](https://reference.langchain.com/python/langchain-core/utils/utils/mock_now) - [`guard_import()`](https://reference.langchain.com/python/langchain-core/utils/utils/guard_import) - [`check_package_version()`](https://reference.langchain.com/python/langchain-core/utils/utils/check_package_version) - [`get_pydantic_field_names()`](https://reference.langchain.com/python/langchain-core/utils/utils/get_pydantic_field_names) - [`build_extra_kwargs()`](https://reference.langchain.com/python/langchain-core/utils/utils/build_extra_kwargs) - [`convert_to_secret_str()`](https://reference.langchain.com/python/langchain-core/utils/utils/convert_to_secret_str) - [`from_env()`](https://reference.langchain.com/python/langchain-core/utils/utils/from_env) - [`secret_from_env()`](https://reference.langchain.com/python/langchain-core/utils/utils/secret_from_env) - [`ensure_id()`](https://reference.langchain.com/python/langchain-core/utils/utils/ensure_id) - [`get_color_mapping()`](https://reference.langchain.com/python/langchain-core/utils/input/get_color_mapping) - [`get_colored_text()`](https://reference.langchain.com/python/langchain-core/utils/input/get_colored_text) - [`get_bolded_text()`](https://reference.langchain.com/python/langchain-core/utils/input/get_bolded_text) - [`print_text()`](https://reference.langchain.com/python/langchain-core/utils/input/print_text) - [`py_anext()`](https://reference.langchain.com/python/langchain-core/utils/aiter/py_anext) - [`tee_peer()`](https://reference.langchain.com/python/langchain-core/utils/aiter/tee_peer) - [`abatch_iterate()`](https://reference.langchain.com/python/langchain-core/utils/aiter/abatch_iterate) - [`uuid7()`](https://reference.langchain.com/python/langchain-core/utils/uuid/uuid7) - [`tee_peer()`](https://reference.langchain.com/python/langchain-core/utils/iter/tee_peer) - [`batch_iterate()`](https://reference.langchain.com/python/langchain-core/utils/iter/batch_iterate) - [`parse_partial_json()`](https://reference.langchain.com/python/langchain-core/utils/json/parse_partial_json) - [`parse_json_markdown()`](https://reference.langchain.com/python/langchain-core/utils/json/parse_json_markdown) - [`parse_and_check_json_markdown()`](https://reference.langchain.com/python/langchain-core/utils/json/parse_and_check_json_markdown) - [`merge_dicts()`](https://reference.langchain.com/python/langchain-core/utils/_merge/merge_dicts) - [`merge_lists()`](https://reference.langchain.com/python/langchain-core/utils/_merge/merge_lists) - [`merge_obj()`](https://reference.langchain.com/python/langchain-core/utils/_merge/merge_obj) - [`is_interactive_env()`](https://reference.langchain.com/python/langchain-core/utils/interactive_env/is_interactive_env) - [`stringify_value()`](https://reference.langchain.com/python/langchain-core/utils/strings/stringify_value) - [`stringify_dict()`](https://reference.langchain.com/python/langchain-core/utils/strings/stringify_dict) - [`comma_list()`](https://reference.langchain.com/python/langchain-core/utils/strings/comma_list) - [`sanitize_for_postgres()`](https://reference.langchain.com/python/langchain-core/utils/strings/sanitize_for_postgres) - [`env_var_is_set()`](https://reference.langchain.com/python/langchain-core/utils/env/env_var_is_set) - [`get_from_dict_or_env()`](https://reference.langchain.com/python/langchain-core/utils/env/get_from_dict_or_env) - [`get_from_env()`](https://reference.langchain.com/python/langchain-core/utils/env/get_from_env) - [`get_pydantic_major_version()`](https://reference.langchain.com/python/langchain-core/utils/pydantic/get_pydantic_major_version) - [`is_pydantic_v1_subclass()`](https://reference.langchain.com/python/langchain-core/utils/pydantic/is_pydantic_v1_subclass) - [`is_pydantic_v2_subclass()`](https://reference.langchain.com/python/langchain-core/utils/pydantic/is_pydantic_v2_subclass) - [`is_basemodel_subclass()`](https://reference.langchain.com/python/langchain-core/utils/pydantic/is_basemodel_subclass) - [`is_basemodel_instance()`](https://reference.langchain.com/python/langchain-core/utils/pydantic/is_basemodel_instance) - [`pre_init()`](https://reference.langchain.com/python/langchain-core/utils/pydantic/pre_init) - [`get_fields()`](https://reference.langchain.com/python/langchain-core/utils/pydantic/get_fields) - [`create_model()`](https://reference.langchain.com/python/langchain-core/utils/pydantic/create_model) - [`create_model_v2()`](https://reference.langchain.com/python/langchain-core/utils/pydantic/create_model_v2) - [`grab_literal()`](https://reference.langchain.com/python/langchain-core/utils/mustache/grab_literal) - [`l_sa_check()`](https://reference.langchain.com/python/langchain-core/utils/mustache/l_sa_check) - [`r_sa_check()`](https://reference.langchain.com/python/langchain-core/utils/mustache/r_sa_check) - [`parse_tag()`](https://reference.langchain.com/python/langchain-core/utils/mustache/parse_tag) - [`tokenize()`](https://reference.langchain.com/python/langchain-core/utils/mustache/tokenize) - [`render()`](https://reference.langchain.com/python/langchain-core/utils/mustache/render) - [`convert_to_openai_function()`](https://reference.langchain.com/python/langchain-core/utils/function_calling/convert_to_openai_function) - [`convert_to_openai_tool()`](https://reference.langchain.com/python/langchain-core/utils/function_calling/convert_to_openai_tool) - [`convert_to_json_schema()`](https://reference.langchain.com/python/langchain-core/utils/function_calling/convert_to_json_schema) - [`tool_example_to_messages()`](https://reference.langchain.com/python/langchain-core/utils/function_calling/tool_example_to_messages) - [`trace_as_chain_group()`](https://reference.langchain.com/python/langchain-core/callbacks/manager/trace_as_chain_group) - [`atrace_as_chain_group()`](https://reference.langchain.com/python/langchain-core/callbacks/manager/atrace_as_chain_group) - [`shielded()`](https://reference.langchain.com/python/langchain-core/callbacks/manager/shielded) - [`handle_event()`](https://reference.langchain.com/python/langchain-core/callbacks/manager/handle_event) - [`ahandle_event()`](https://reference.langchain.com/python/langchain-core/callbacks/manager/ahandle_event) - [`adispatch_custom_event()`](https://reference.langchain.com/python/langchain-core/callbacks/manager/adispatch_custom_event) - [`dispatch_custom_event()`](https://reference.langchain.com/python/langchain-core/callbacks/manager/dispatch_custom_event) - [`get_usage_metadata_callback()`](https://reference.langchain.com/python/langchain-core/callbacks/usage/get_usage_metadata_callback) - [`is_openai_data_block()`](https://reference.langchain.com/python/langchain-core/language_models/_utils/is_openai_data_block) - [`generate_from_stream()`](https://reference.langchain.com/python/langchain-core/language_models/chat_models/generate_from_stream) - [`agenerate_from_stream()`](https://reference.langchain.com/python/langchain-core/language_models/chat_models/agenerate_from_stream) - [`create_base_retry_decorator()`](https://reference.langchain.com/python/langchain-core/language_models/llms/create_base_retry_decorator) - [`get_prompts()`](https://reference.langchain.com/python/langchain-core/language_models/llms/get_prompts) - [`aget_prompts()`](https://reference.langchain.com/python/langchain-core/language_models/llms/aget_prompts) - [`update_cache()`](https://reference.langchain.com/python/langchain-core/language_models/llms/update_cache) - [`aupdate_cache()`](https://reference.langchain.com/python/langchain-core/language_models/llms/aupdate_cache) - [`get_tokenizer()`](https://reference.langchain.com/python/langchain-core/language_models/base/get_tokenizer) - [`merge_chat_generation_chunks()`](https://reference.langchain.com/python/langchain-core/outputs/chat_generation/merge_chat_generation_chunks) - [`droplastn()`](https://reference.langchain.com/python/langchain-core/output_parsers/list/droplastn) - [`parse_tool_call()`](https://reference.langchain.com/python/langchain-core/output_parsers/openai_tools/parse_tool_call) - [`make_invalid_tool_call()`](https://reference.langchain.com/python/langchain-core/output_parsers/openai_tools/make_invalid_tool_call) - [`parse_tool_calls()`](https://reference.langchain.com/python/langchain-core/output_parsers/openai_tools/parse_tool_calls) - [`nested_element()`](https://reference.langchain.com/python/langchain-core/output_parsers/xml/nested_element) - [`is_uuid()`](https://reference.langchain.com/python/langchain-core/runnables/graph/is_uuid) - [`node_data_str()`](https://reference.langchain.com/python/langchain-core/runnables/graph/node_data_str) - [`node_data_json()`](https://reference.langchain.com/python/langchain-core/runnables/graph/node_data_json) - [`coerce_to_runnable()`](https://reference.langchain.com/python/langchain-core/runnables/base/coerce_to_runnable) - [`chain()`](https://reference.langchain.com/python/langchain-core/runnables/base/chain) - [`draw_ascii()`](https://reference.langchain.com/python/langchain-core/runnables/graph_ascii/draw_ascii) - [`gated_coro()`](https://reference.langchain.com/python/langchain-core/runnables/utils/gated_coro) - [`gather_with_concurrency()`](https://reference.langchain.com/python/langchain-core/runnables/utils/gather_with_concurrency) - [`accepts_run_manager()`](https://reference.langchain.com/python/langchain-core/runnables/utils/accepts_run_manager) - [`accepts_config()`](https://reference.langchain.com/python/langchain-core/runnables/utils/accepts_config) - [`accepts_context()`](https://reference.langchain.com/python/langchain-core/runnables/utils/accepts_context) - [`asyncio_accepts_context()`](https://reference.langchain.com/python/langchain-core/runnables/utils/asyncio_accepts_context) - [`coro_with_context()`](https://reference.langchain.com/python/langchain-core/runnables/utils/coro_with_context) - [`get_function_first_arg_dict_keys()`](https://reference.langchain.com/python/langchain-core/runnables/utils/get_function_first_arg_dict_keys) - [`get_lambda_source()`](https://reference.langchain.com/python/langchain-core/runnables/utils/get_lambda_source) - [`get_function_nonlocals()`](https://reference.langchain.com/python/langchain-core/runnables/utils/get_function_nonlocals) - [`indent_lines_after_first()`](https://reference.langchain.com/python/langchain-core/runnables/utils/indent_lines_after_first) - [`add()`](https://reference.langchain.com/python/langchain-core/runnables/utils/add) - [`aadd()`](https://reference.langchain.com/python/langchain-core/runnables/utils/aadd) - [`get_unique_config_specs()`](https://reference.langchain.com/python/langchain-core/runnables/utils/get_unique_config_specs) - [`is_async_generator()`](https://reference.langchain.com/python/langchain-core/runnables/utils/is_async_generator) - [`is_async_callable()`](https://reference.langchain.com/python/langchain-core/runnables/utils/is_async_callable) - [`identity()`](https://reference.langchain.com/python/langchain-core/runnables/passthrough/identity) - [`aidentity()`](https://reference.langchain.com/python/langchain-core/runnables/passthrough/aidentity) - [`set_config_context()`](https://reference.langchain.com/python/langchain-core/runnables/config/set_config_context) - [`ensure_config()`](https://reference.langchain.com/python/langchain-core/runnables/config/ensure_config) - [`get_config_list()`](https://reference.langchain.com/python/langchain-core/runnables/config/get_config_list) - [`patch_config()`](https://reference.langchain.com/python/langchain-core/runnables/config/patch_config) - [`merge_configs()`](https://reference.langchain.com/python/langchain-core/runnables/config/merge_configs) - [`call_func_with_variable_args()`](https://reference.langchain.com/python/langchain-core/runnables/config/call_func_with_variable_args) - [`acall_func_with_variable_args()`](https://reference.langchain.com/python/langchain-core/runnables/config/acall_func_with_variable_args) - [`get_callback_manager_for_config()`](https://reference.langchain.com/python/langchain-core/runnables/config/get_callback_manager_for_config) - [`get_async_callback_manager_for_config()`](https://reference.langchain.com/python/langchain-core/runnables/config/get_async_callback_manager_for_config) - [`get_executor_for_config()`](https://reference.langchain.com/python/langchain-core/runnables/config/get_executor_for_config) - [`run_in_executor()`](https://reference.langchain.com/python/langchain-core/runnables/config/run_in_executor) - [`draw_mermaid()`](https://reference.langchain.com/python/langchain-core/runnables/graph_mermaid/draw_mermaid) - [`draw_mermaid_png()`](https://reference.langchain.com/python/langchain-core/runnables/graph_mermaid/draw_mermaid_png) - [`prefix_config_spec()`](https://reference.langchain.com/python/langchain-core/runnables/configurable/prefix_config_spec) - [`make_options_spec()`](https://reference.langchain.com/python/langchain-core/runnables/configurable/make_options_spec) - [`is_private_ip()`](https://reference.langchain.com/python/langchain-core/_security/_ssrf_protection/is_private_ip) - [`is_cloud_metadata()`](https://reference.langchain.com/python/langchain-core/_security/_ssrf_protection/is_cloud_metadata) - [`is_localhost()`](https://reference.langchain.com/python/langchain-core/_security/_ssrf_protection/is_localhost) - [`validate_safe_url()`](https://reference.langchain.com/python/langchain-core/_security/_ssrf_protection/validate_safe_url) - [`is_safe_url()`](https://reference.langchain.com/python/langchain-core/_security/_ssrf_protection/is_safe_url) - [`default_init_validator()`](https://reference.langchain.com/python/langchain-core/load/load/default_init_validator) - [`loads()`](https://reference.langchain.com/python/langchain-core/load/load/loads) - [`load()`](https://reference.langchain.com/python/langchain-core/load/load/load) - [`default()`](https://reference.langchain.com/python/langchain-core/load/dump/default) - [`dumps()`](https://reference.langchain.com/python/langchain-core/load/dump/dumps) - [`dumpd()`](https://reference.langchain.com/python/langchain-core/load/dump/dumpd) - [`try_neq_default()`](https://reference.langchain.com/python/langchain-core/load/serializable/try_neq_default) - [`to_json_not_implemented()`](https://reference.langchain.com/python/langchain-core/load/serializable/to_json_not_implemented) - [`create_schema_from_function()`](https://reference.langchain.com/python/langchain-core/tools/base/create_schema_from_function) - [`get_all_basemodel_annotations()`](https://reference.langchain.com/python/langchain-core/tools/base/get_all_basemodel_annotations) - [`tool()`](https://reference.langchain.com/python/langchain-core/tools/convert/tool) - [`convert_runnable_to_tool()`](https://reference.langchain.com/python/langchain-core/tools/convert/convert_runnable_to_tool) - [`render_text_description()`](https://reference.langchain.com/python/langchain-core/tools/render/render_text_description) - [`render_text_description_and_args()`](https://reference.langchain.com/python/langchain-core/tools/render/render_text_description_and_args) - [`create_retriever_tool()`](https://reference.langchain.com/python/langchain-core/tools/retriever/create_retriever_tool) ## Types - [`Annotation`](https://reference.langchain.com/python/langchain-core/messages/content/Annotation) - [`DataContentBlock`](https://reference.langchain.com/python/langchain-core/messages/content/DataContentBlock) - [`ToolContentBlock`](https://reference.langchain.com/python/langchain-core/messages/content/ToolContentBlock) - [`ContentBlock`](https://reference.langchain.com/python/langchain-core/messages/content/ContentBlock) - [`MessageLikeRepresentation`](https://reference.langchain.com/python/langchain-core/messages/utils/MessageLikeRepresentation) - [`MessageLike`](https://reference.langchain.com/python/langchain-core/prompts/chat/MessageLike) - [`MessageLikeRepresentation`](https://reference.langchain.com/python/langchain-core/prompts/chat/MessageLikeRepresentation) - [`PathLike`](https://reference.langchain.com/python/langchain-core/documents/base/PathLike) - [`Matrix`](https://reference.langchain.com/python/langchain-core/vectorstores/utils/Matrix) - [`Listener`](https://reference.langchain.com/python/langchain-core/tracers/root_listeners/Listener) - [`AsyncListener`](https://reference.langchain.com/python/langchain-core/tracers/root_listeners/AsyncListener) - [`Scopes`](https://reference.langchain.com/python/langchain-core/utils/mustache/Scopes) - [`Callbacks`](https://reference.langchain.com/python/langchain-core/callbacks/base/Callbacks) - [`LanguageModelInput`](https://reference.langchain.com/python/langchain-core/language_models/base/LanguageModelInput) - [`LanguageModelOutput`](https://reference.langchain.com/python/langchain-core/language_models/base/LanguageModelOutput) - [`PydanticBaseModel`](https://reference.langchain.com/python/langchain-core/output_parsers/json/PydanticBaseModel) - [`RunnableLike`](https://reference.langchain.com/python/langchain-core/runnables/base/RunnableLike) - [`StreamEvent`](https://reference.langchain.com/python/langchain-core/runnables/schema/StreamEvent) - [`AnyConfigurableField`](https://reference.langchain.com/python/langchain-core/runnables/utils/AnyConfigurableField) - [`MessagesOrDictWithMessages`](https://reference.langchain.com/python/langchain-core/runnables/history/MessagesOrDictWithMessages) - [`ArgsSchema`](https://reference.langchain.com/python/langchain-core/tools/base/ArgsSchema)