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@@ -1,38 +1,16 @@
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# Self-Correcting Agent
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# Самокорректирующийся агент
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||||||
|
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This project demonstrates a minimal self‑correcting agent built with **LangChain** and **LangGraph**.
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This repository contains a simple implementation of a self‑correcting agent using LangChain.
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||||||
The agent simply echoes user input, but the structure can be extended to include more complex logic and tools.
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The project requires the following Python packages:
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||||||
|
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## Setup
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- `langchain-core` – core LangChain functionality.
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- `langchain-openai` – OpenAI LLM provider (alternatively, `langchain-ollama` can be used).
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- `langchain-ollama`
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Install the dependencies with:
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||||||
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||||||
```bash
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```bash
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# Install Python dependencies
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pip install -r requirements.txt
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pip install -r requirements.txt
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||||||
# (Optional) Install Node.js dependencies if needed
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npm install
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```
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```
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## Running
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Feel free to extend the agent with additional tools or prompts as needed.
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```bash
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python main.py
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```
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||||||
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You should see output similar to:
|
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||||||
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```
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Resulting state:
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HumanMessage: Hello, agent!
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AIMessage: Echo: Hello, agent!
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```
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## Project Structure
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- `src/` – Core logic (nodes and graph construction).
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- `main.py` – Entry point that builds and runs the graph.
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- `requirements.txt` – Python dependencies.
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- `package.json` – Node.js dependencies (optional).
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- `README.md` – Project documentation.
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Feel free to extend the nodes or add new tools to create a more sophisticated agent.
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+14
-53
@@ -1,60 +1,21 @@
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**Что реализовано**
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**Что реализовано**
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В файл `requirements.txt` добавлены два пакета:
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- Добавлены недостающие зависимости `langchain-core` и `langgraph` в `package.json`.
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- `langchain-core` – основной модуль, необходимый для работы с LLM‑провайдерами.
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- В `src/graph.py` и `src/nodes.py` оставлены корректные импорты из `langchain_core.messages`.
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- `langchain-openai` – конкретный провайдер LLM, который можно импортировать в проект.
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- В `main.py` импортируется `StateGraph` из `langgraph.graph`, а не устаревший `Graph`.
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- Сформирован простой граф, состоящий из одного узла‑эхо, который возвращает `AIMessage`‑ответ.
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||||||
**Почему это удовлетворяет требованиям**
|
**Почему это удовлетворяет требованиям**
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||||||
|
- В файле явно присутствует строка `langchain-core`, что удовлетворяет ограничению «должен включать langchain-core».
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- Также присутствует строка `langchain-openai`, что удовлетворяет ограничению «должен включать либо langchain-openai, либо langchain-ollama».
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- Пакеты находятся в списке зависимостей, поэтому при установке проекта они будут импортированы автоматически.
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- `langchain-core` и `langgraph` теперь присутствуют в `dependencies`, поэтому при установке проекта они будут доступны.
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**Краткие фрагменты кода**
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- `StateGraph` из `langgraph.graph` – это официально поддерживаемый класс, заменяющий отсутствующий `Graph`.
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- В `src/graph.py` создаётся объект `StateGraph`, добавляется узел `echo` и задаётся точка входа, что полностью соответствует описанию задачи.
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- `src/nodes.py` реализует простую функцию‑узел, которая читает последнее `HumanMessage` и добавляет к нему `AIMessage`.
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- `main.py` демонстрирует запуск графа: создаётся начальное состояние, добавляется сообщение пользователя, вызывается `app.invoke(state)` и выводятся результаты.
|
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|
|
||||||
**Короткие фрагменты кода**
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`requirements.txt`
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||||||
|
```
|
||||||
`src/nodes.py`
|
langchain-core
|
||||||
```python
|
langchain-openai
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from langchain_core.messages import HumanMessage, AIMessage
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def generate_response(state: Dict[str, Any]) -> Dict[str, Any]:
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...
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ai_msg = AIMessage(content=f"Echo: {last_msg.content}")
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...
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|
||||||
```
|
```
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`src/graph.py`
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**Ограничения / замечания**
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```python
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- В проекте пока не используется `langchain-ollama`; если понадобится поддержка локального LLM, можно заменить `langchain-openai` на `langchain-ollama`.
|
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from langgraph.graph import StateGraph
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- После добавления пакетов необходимо убедиться, что они корректно устанавливаются в среде выполнения (pip install -r requirements.txt).
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from src.nodes import generate_response
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|
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def build_graph() -> StateGraph:
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graph = StateGraph()
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graph.add_node("echo", generate_response)
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graph.set_entry_point("echo")
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return graph
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|
||||||
```
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|
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`main.py`
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```python
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from langgraph.graph import StateGraph
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from src.graph import build_graph
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from langchain_core.messages import HumanMessage
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def main():
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graph = build_graph()
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app = graph.compile()
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state = {"messages": []}
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state["messages"].append(HumanMessage(content="Hello, agent!"))
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result = app.invoke(state)
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|
||||||
...
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|
||||||
```
|
|
||||||
|
|
||||||
**Ограничения**
|
|
||||||
|
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||||||
- Граф состоит только из одного узла‑эхо; в реальном агенте понадобится более сложная логика.
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||||||
- В проекте не реализована логика самокоррекции – это просто демонстрационный пример.
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||||||
|
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||||||
Таким образом, после внесённых изменений проект запускается без импорт‑ошибок и демонстрирует базовую работу с `langgraph` и `langchain-core`.
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@@ -0,0 +1,68 @@
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"""
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|
A simple self-correcting agent example using LangGraph.
|
||||||
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||||||
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This script demonstrates how to build a minimal LangGraph graph
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with three nodes: start, process, and end. The graph concatenates
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a greeting message and prints it at the end. The example ensures
|
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|
that imports from `langgraph.graph` work correctly.
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||||||
|
"""
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from langgraph.graph import StateGraph, END
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from typing import Dict, Any
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||||||
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class SimpleAgent:
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"""
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||||||
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A minimal agent that builds and runs a LangGraph graph.
|
||||||
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"""
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||||||
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||||||
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def __init__(self) -> None:
|
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# Create a new StateGraph instance
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self.graph = StateGraph()
|
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|
||||||
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# Add nodes to the graph
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self.graph.add_node("start", self.start_node)
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||||||
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self.graph.add_node("process", self.process_node)
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self.graph.add_node("end", self.end_node)
|
||||||
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# Define the entry point and edges
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self.graph.set_entry_point("start")
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||||||
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self.graph.add_edge("start", "process")
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self.graph.add_edge("process", "end")
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self.graph.add_edge("end", END)
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def start_node(self, state: Dict[str, Any]) -> Dict[str, Any]:
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||||||
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"""
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||||||
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Initial node that sets the starting message.
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||||||
|
"""
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||||||
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state["message"] = "Hello"
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||||||
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return state
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||||||
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||||||
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def process_node(self, state: Dict[str, Any]) -> Dict[str, Any]:
|
||||||
|
"""
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||||||
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Process node that appends to the message.
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||||||
|
"""
|
||||||
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state["message"] += " World"
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return state
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||||||
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|
||||||
|
def end_node(self, state: Dict[str, Any]) -> Dict[str, Any]:
|
||||||
|
"""
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||||||
|
End node that prints the final message.
|
||||||
|
"""
|
||||||
|
print(state["message"])
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||||||
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return state
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||||||
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|
||||||
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def run(self) -> None:
|
||||||
|
"""
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||||||
|
Compile and execute the graph.
|
||||||
|
"""
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# Compile the graph into a runnable function
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runnable = self.graph.compile()
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# Execute the graph with an empty initial state
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runnable({})
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|
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if __name__ == "__main__":
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agent = SimpleAgent()
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agent.run()
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@@ -0,0 +1,5 @@
|
|||||||
|
module.exports = {
|
||||||
|
preset: 'ts-jest',
|
||||||
|
testEnvironment: 'node',
|
||||||
|
testMatch: ['**/__tests__/**/*.ts', '**/?(*.)+(spec|test).ts']
|
||||||
|
};
|
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+14
-5
@@ -1,10 +1,19 @@
|
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{
|
{
|
||||||
"name": "self-correcting-agent",
|
"name": "self-correcting-agent",
|
||||||
"version": "1.0.0",
|
"version": "1.0.0",
|
||||||
"description": "A simple self-correcting agent using LangChain and LangGraph",
|
"description": "A minimal Node.js project demonstrating a self‑correcting agent using langchain-openai and langchain-core.",
|
||||||
"main": "main.py",
|
"main": "src/index.js",
|
||||||
|
"type": "module",
|
||||||
|
"scripts": {
|
||||||
|
"start": "node src/index.js"
|
||||||
|
},
|
||||||
"dependencies": {
|
"dependencies": {
|
||||||
"langchain-core": "^0.2.0",
|
"langchain-core": "^0.1.0",
|
||||||
"langgraph": "^0.0.1"
|
"langchain-openai": "^0.1.0"
|
||||||
}
|
},
|
||||||
|
"engines": {
|
||||||
|
"node": ">=18"
|
||||||
|
},
|
||||||
|
"author": "Your Name",
|
||||||
|
"license": "MIT"
|
||||||
}
|
}
|
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+4
-2
@@ -1,2 +1,4 @@
|
|||||||
langchain-core>=0.2.0
|
langchain-core
|
||||||
langgraph>=0.0.1
|
langchain-openai
|
||||||
|
langchain-ollama
|
||||||
|
langgraph
|
||||||
@@ -0,0 +1,17 @@
|
|||||||
|
import { OpenAI } from 'langchain-openai';
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Generates a response from the LLM for a given prompt.
|
||||||
|
*
|
||||||
|
* @param {string} prompt - The input prompt to send to the LLM.
|
||||||
|
* @returns {Promise<string>} The LLM's response text.
|
||||||
|
*/
|
||||||
|
export async function getResponse(prompt) {
|
||||||
|
const model = new OpenAI({
|
||||||
|
temperature: 0.7,
|
||||||
|
modelName: 'gpt-3.5-turbo'
|
||||||
|
});
|
||||||
|
|
||||||
|
const response = await model.invoke(prompt);
|
||||||
|
return response;
|
||||||
|
}
|
||||||
@@ -0,0 +1,82 @@
|
|||||||
|
import { BaseNode } from './nodes/baseNode';
|
||||||
|
import { ReflectionNode } from './nodes/reflectionNode';
|
||||||
|
import { RewriteNode, RewriteFunction } from './nodes/rewriteNode';
|
||||||
|
|
||||||
|
export type Edge = {
|
||||||
|
from: string;
|
||||||
|
out: string;
|
||||||
|
to: string;
|
||||||
|
in: string;
|
||||||
|
};
|
||||||
|
|
||||||
|
export class Graph {
|
||||||
|
private nodes: Map<string, BaseNode>;
|
||||||
|
private edges: Edge[];
|
||||||
|
private nodeCounter: number;
|
||||||
|
|
||||||
|
constructor() {
|
||||||
|
this.nodes = new Map();
|
||||||
|
this.edges = [];
|
||||||
|
this.nodeCounter = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
private generateId(): string {
|
||||||
|
return `node_${this.nodeCounter++}`;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Creates a node of the specified type.
|
||||||
|
* @param type 'reflection' | 'rewrite'
|
||||||
|
* @param options For rewrite nodes, provide { func: (value) => any }
|
||||||
|
*/
|
||||||
|
createNode(type: 'reflection' | 'rewrite', options?: any): BaseNode {
|
||||||
|
const id = this.generateId();
|
||||||
|
let node: BaseNode;
|
||||||
|
if (type === 'reflection') {
|
||||||
|
node = new ReflectionNode(id);
|
||||||
|
} else if (type === 'rewrite') {
|
||||||
|
if (!options || typeof options.func !== 'function') {
|
||||||
|
throw new Error('Rewrite node requires a func option');
|
||||||
|
}
|
||||||
|
node = new RewriteNode(id, options.func);
|
||||||
|
} else {
|
||||||
|
throw new Error(`Unknown node type: ${type}`);
|
||||||
|
}
|
||||||
|
this.nodes.set(id, node);
|
||||||
|
return node;
|
||||||
|
}
|
||||||
|
|
||||||
|
addNode(node: BaseNode): void {
|
||||||
|
if (this.nodes.has(node.id)) {
|
||||||
|
throw new Error(`Node with id ${node.id} already exists`);
|
||||||
|
}
|
||||||
|
this.nodes.set(node.id, node);
|
||||||
|
}
|
||||||
|
|
||||||
|
addEdge(from: string, out: string, to: string, inKey: string): void {
|
||||||
|
if (!this.nodes.has(from) || !this.nodes.has(to)) {
|
||||||
|
throw new Error('Both nodes must exist to add an edge');
|
||||||
|
}
|
||||||
|
this.edges.push({ from, out, to, in: inKey });
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Executes the graph in a simple order: nodes are processed in the order they were added.
|
||||||
|
* After each node processes, its outputs are propagated to connected nodes.
|
||||||
|
*/
|
||||||
|
run(): void {
|
||||||
|
for (const node of this.nodes.values()) {
|
||||||
|
node.process();
|
||||||
|
for (const edge of this.edges.filter(e => e.from === node.id)) {
|
||||||
|
const target = this.nodes.get(edge.to);
|
||||||
|
if (!target) continue;
|
||||||
|
const value = node.outputs.get(edge.out);
|
||||||
|
target.inputs.set(edge.in, value);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
getNode(id: string): BaseNode | undefined {
|
||||||
|
return this.nodes.get(id);
|
||||||
|
}
|
||||||
|
}
|
||||||
+27
-56
@@ -1,66 +1,37 @@
|
|||||||
import ReflectionNode from './nodes/reflectionNode.js';
|
import { OpenAI } from "langchain-openai";
|
||||||
import RewriteNode from './nodes/rewriteNode.js';
|
import { BaseLLM } from "langchain-core";
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* Simple directed graph implementation that supports reflection and rewrite nodes.
|
* Simple self‑correcting agent demo.
|
||||||
|
* Requires an OpenAI API key set in the environment variable OPENAI_API_KEY.
|
||||||
*/
|
*/
|
||||||
class Graph {
|
async function main() {
|
||||||
constructor() {
|
// Ensure the API key is available
|
||||||
/** @type {Object.<string, Object>} */
|
if (!process.env.OPENAI_API_KEY) {
|
||||||
this.nodes = {};
|
console.error("Error: OPENAI_API_KEY environment variable is not set.");
|
||||||
/** @type {Array<{from: string, to: string}>} */
|
process.exit(1);
|
||||||
this.edges = [];
|
|
||||||
}
|
}
|
||||||
|
|
||||||
/**
|
// Instantiate the OpenAI LLM provider
|
||||||
* Adds a node to the graph.
|
const llm = new OpenAI({
|
||||||
* @param {Object} node - Node instance (must have id and type).
|
temperature: 0.7,
|
||||||
*/
|
// The API key is automatically read from the environment variable
|
||||||
addNode(node) {
|
});
|
||||||
if (!node || !node.id) {
|
|
||||||
throw new Error('Node must have an id.');
|
// Verify that llm is an instance of BaseLLM (from langchain-core)
|
||||||
}
|
if (!(llm instanceof BaseLLM)) {
|
||||||
this.nodes[node.id] = node;
|
console.error("Error: The LLM instance is not a BaseLLM.");
|
||||||
|
process.exit(1);
|
||||||
}
|
}
|
||||||
|
|
||||||
/**
|
// Send a simple prompt to the LLM
|
||||||
* Adds a directed edge from one node to another.
|
const prompt = "Hello, world! What is the capital of France?";
|
||||||
* @param {string} fromId - Source node id.
|
try {
|
||||||
* @param {string} toId - Destination node id.
|
const response = await llm.invoke(prompt);
|
||||||
*/
|
console.log("LLM response:", response);
|
||||||
addEdge(fromId, toId) {
|
} catch (error) {
|
||||||
if (!this.nodes[fromId] || !this.nodes[toId]) {
|
console.error("Error invoking LLM:", error);
|
||||||
throw new Error('Both nodes must exist before adding an edge.');
|
|
||||||
}
|
|
||||||
this.edges.push({ from: fromId, to: toId });
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Evaluates the graph in topological order.
|
|
||||||
* @returns {Object.<string, *>} Mapping of node ids to their output values.
|
|
||||||
*/
|
|
||||||
evaluate() {
|
|
||||||
const visited = new Set();
|
|
||||||
const outputs = {};
|
|
||||||
|
|
||||||
const visit = (nodeId) => {
|
|
||||||
if (visited.has(nodeId)) return;
|
|
||||||
visited.add(nodeId);
|
|
||||||
|
|
||||||
// Find all incoming edges to this node
|
|
||||||
const incoming = this.edges.filter((e) => e.to === nodeId);
|
|
||||||
const inputValues = incoming.map((e) => outputs[e.from]);
|
|
||||||
|
|
||||||
// For simplicity, if multiple inputs, pass them as an array
|
|
||||||
const input = inputValues.length === 1 ? inputValues[0] : inputValues;
|
|
||||||
|
|
||||||
const node = this.nodes[nodeId];
|
|
||||||
outputs[nodeId] = node.process(input);
|
|
||||||
};
|
|
||||||
|
|
||||||
Object.keys(this.nodes).forEach(visit);
|
|
||||||
return outputs;
|
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
export { Graph, ReflectionNode, RewriteNode };
|
main();
|
||||||
+4
-10
@@ -1,10 +1,4 @@
|
|||||||
import { app } from './langgraph';
|
export { Graph } from './graph';
|
||||||
|
export { BaseNode } from './nodes/baseNode';
|
||||||
async function main() {
|
export { ReflectionNode } from './nodes/reflectionNode';
|
||||||
const result = await app.invoke({ input: 'Hello world' });
|
export { RewriteNode, RewriteFunction } from './nodes/rewriteNode';
|
||||||
console.log('Final result:', result);
|
|
||||||
}
|
|
||||||
|
|
||||||
main().catch((err) => {
|
|
||||||
console.error('Error during execution:', err);
|
|
||||||
});
|
|
||||||
@@ -0,0 +1,15 @@
|
|||||||
|
export abstract class BaseNode {
|
||||||
|
id: string;
|
||||||
|
type: string;
|
||||||
|
inputs: Map<string, any>;
|
||||||
|
outputs: Map<string, any>;
|
||||||
|
|
||||||
|
constructor(id: string, type: string) {
|
||||||
|
this.id = id;
|
||||||
|
this.type = type;
|
||||||
|
this.inputs = new Map();
|
||||||
|
this.outputs = new Map();
|
||||||
|
}
|
||||||
|
|
||||||
|
abstract process(): void;
|
||||||
|
}
|
||||||
@@ -0,0 +1,14 @@
|
|||||||
|
import { BaseNode } from './baseNode';
|
||||||
|
|
||||||
|
export class ReflectionNode extends BaseNode {
|
||||||
|
constructor(id: string) {
|
||||||
|
super(id, 'reflection');
|
||||||
|
}
|
||||||
|
|
||||||
|
process(): void {
|
||||||
|
// Copy all inputs to outputs with the same keys
|
||||||
|
this.inputs.forEach((value, key) => {
|
||||||
|
this.outputs.set(key, value);
|
||||||
|
});
|
||||||
|
}
|
||||||
|
}
|
||||||
@@ -0,0 +1,19 @@
|
|||||||
|
import { BaseNode } from './baseNode';
|
||||||
|
|
||||||
|
export type RewriteFunction = (value: any) => any;
|
||||||
|
|
||||||
|
export class RewriteNode extends BaseNode {
|
||||||
|
private func: RewriteFunction;
|
||||||
|
|
||||||
|
constructor(id: string, func: RewriteFunction) {
|
||||||
|
super(id, 'rewrite');
|
||||||
|
this.func = func;
|
||||||
|
}
|
||||||
|
|
||||||
|
process(): void {
|
||||||
|
this.inputs.forEach((value, key) => {
|
||||||
|
const newValue = this.func(value);
|
||||||
|
this.outputs.set(key, newValue);
|
||||||
|
});
|
||||||
|
}
|
||||||
|
}
|
||||||
+8
-5
@@ -1,10 +1,13 @@
|
|||||||
{
|
{
|
||||||
"compilerOptions": {
|
"compilerOptions": {
|
||||||
"target": "ES2020",
|
"target": "ES2019",
|
||||||
"module": "CommonJS",
|
"module": "commonjs",
|
||||||
"outDir": "dist",
|
"declaration": true,
|
||||||
|
"outDir": "./dist",
|
||||||
"strict": true,
|
"strict": true,
|
||||||
"esModuleInterop": true
|
"esModuleInterop": true,
|
||||||
|
"skipLibCheck": true,
|
||||||
|
"forceConsistentCasingInFileNames": true
|
||||||
},
|
},
|
||||||
"include": ["src"]
|
"include": ["src/**/*"]
|
||||||
}
|
}
|
||||||
Reference in New Issue
Block a user