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Title: tools | langchain | LangChain Reference

Open Graph Title: tools | langchain

X Title: tools | langchain

Description: Python API reference for tools in langchain. Part of the LangChain ecosystem.

Open Graph Description: Python API reference for tools in langchain. Part of the LangChain ecosystem.

X Description: Python API reference for tools in langchain. Part of the LangChain ecosystem.

Opengraph URL: https://reference.langchain.com/python/langchain/tools

direct link

Domain: reference.langchain.com

og:imagehttps://reference.langchain.com/og/python/langchain/tools
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og:image:height630
og:image:alttools | langchain
og:typearticle
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twitter:imagehttps://reference.langchain.com/og/python/langchain/tools

Links:

LangChain Reference home pagehttps://reference.langchain.com/
GitHubhttps://github.com/langchain-ai
Main Docshttps://docs.langchain.com/oss/python/langchain
Deep Agentshttps://reference.langchain.com/python/deepagents
LangChainhttps://reference.langchain.com/python/langchain/overview
LangGraphhttps://reference.langchain.com/python/langgraph/overview
Integrationshttps://reference.langchain.com/python/integrations/overview
LangSmithhttps://reference.langchain.com/python/langsmith
Overviewhttps://reference.langchain.com/python/langchain/overview
Overviewhttps://reference.langchain.com/python/langchain
Agentshttps://reference.langchain.com/python/langchain/agents
Middlewarehttps://reference.langchain.com/python/langchain/middleware
Modelshttps://reference.langchain.com/python/langchain/models
Messageshttps://reference.langchain.com/python/langchain/messages
Toolshttps://reference.langchain.com/python/langchain/tools
Embeddingshttps://reference.langchain.com/python/langchain/embeddings
MCP Adaptershttps://reference.langchain.com/python/langchain-mcp-adapters
Standard Testshttps://reference.langchain.com/python/langchain-tests
Text Splittershttps://reference.langchain.com/python/langchain-text-splitters
https://chat.langchain.com/
Overviewhttps://reference.langchain.com/python/langchain
Agentshttps://reference.langchain.com/python/langchain/agents
Middlewarehttps://reference.langchain.com/python/langchain/middleware
Modelshttps://reference.langchain.com/python/langchain/models
Messageshttps://reference.langchain.com/python/langchain/messages
Toolshttps://reference.langchain.com/python/langchain/tools
Embeddingshttps://reference.langchain.com/python/langchain/embeddings
MCP Adaptershttps://reference.langchain.com/python/langchain-mcp-adapters
Standard Testshttps://reference.langchain.com/python/langchain-tests
Text Splittershttps://reference.langchain.com/python/langchain-text-splitters
langchainhttps://reference.langchain.com/python/langchain
the docshttps://docs.langchain.com/oss/python/langchain/tools
ClassBaseToolBase class for all LangChain tools. This abstract class defines the interface that all LangChain tools must implement. Tools are components that can be called by agents to perform specific actions.https://reference.langchain.com/python/langchain-core/tools/base/BaseTool
ClassInjectedToolArgAnnotation for tool arguments that are injected at runtime. Tool arguments annotated with this class are not included in the tool schema sent to language models and are instead injected during executhttps://reference.langchain.com/python/langchain-core/tools/base/InjectedToolArg
ClassInjectedToolCallIdAnnotation for injecting the tool call ID. This annotation is used to mark a tool parameter that should receive the tool call ID at runtime. from typing import Annotated from langchain_cor https://reference.langchain.com/python/langchain-core/tools/base/InjectedToolCallId
ClassToolExceptionException thrown when a tool execution error occurs. This exception allows tools to signal errors without stopping the agent. The error is handled according to the tool's handle_tool_error settinghttps://reference.langchain.com/python/langchain-core/tools/base/ToolException
AttributetoolLangChain tool instance created from the schema for model binding.https://reference.langchain.com/python/langchain/agents/structured_output/OutputToolBinding/tool

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