Crate langgraph_prebuilt 

Prebuilt components for LangGraph agents.

This crate provides prebuilt components for common agent patterns:

• Message types: Message, ToolCall, MessageContent
• Traits: BaseTool, BaseChatModel for tool and model integration
• ToolNode: Executes tool calls from AI responses
• create_react_agent: Builds a ReAct (Reasoning + Acting) agent graph
• tools_condition: Routing function for tool-calling agents

Re-exports

pub use types::Message;

pub use types::ToolCall;

pub use types::MessageContent;

pub use types::ContentBlock;

pub use types::ImageUrl;

pub use types::add_messages;

pub use types::add_messages_ref;

pub use traits::BaseTool;

pub use traits::BaseChatModel;

pub use traits::MessageStream;

pub use traits::ToolDef;

pub use traits::ClosureTool;

pub use traits::ToolError;

pub use traits::ModelError;

pub use traits::PreparedTools;

pub use traits::prepare_tools;

pub use traits::LlmUsage;

pub use tool_node::ToolNode;

pub use chat_agent::create_react_agent;

pub use chat_agent::ReActAgent;

pub use chat_agent::ReActAgentConfig;

pub use tools_condition::tools_condition;

pub use node_helpers::extract_messages;

pub use node_helpers::llm_response_to_json;

pub use node_helpers::invoke_llm;

pub use node_helpers::invoke_llm_with_config;

pub use node_helpers::stream_llm;

pub use node_helpers::get_i64;

pub use node_helpers::get_str;

pub use node_helpers::response_text;

pub use node_helpers::parse_json_response;

pub use node_helpers::ask_json;

pub use node_helpers::print_stream;

pub use node_helpers::print_stream_with_options;

pub use node_helpers::print_result;

pub use node_helpers::print_result_with_options;

Modules

chat_agent

node_helpers

Helper functions for building graph nodes with minimal boilerplate.

tool_node

tools_condition

traits

types