In this example we’re going to create an agent using LangChain and give it web tools made with Dendrite. The web tools will allow the agent to interact with Instagram through the web app, allowing unlimited customizability based on your agent’s needs. The order we’re going to do this is:
  1. Installing dependencies
  2. Setup and imports
  3. Creating a class for Instagram tools using Dendrite
  4. Defining our langchain tools for the agent using our InstagramTools class
  5. Creating our agent using LangChain
  6. Running the agent in a chat loop between Human and Agent in the console

​
Installing Dependencies

We’re going to start with installing all necessary packages. First, let’s install Dendrite using Poetry: 
poetry add dendrite-sdk && poetry run dendrite install
Now let’s install the langchain packages we need: 
poetry add langchain langgraph langchain_anthropic langchain_core langchain_community
And finally, the remaining packages: 
poetry add pydantic requests

​
Setup

Now, let’s create a python file called agent.py. We’re going to start by importing all dependencies at the top. Don’t worry about their uses, it will become clear later on:
agent.py
import time
from datetime import datetime
import os
from typing import List, Literal

from dendrite import Dendrite

from pydantic import BaseModel
import requests

from langchain.tools import tool

from langchain_anthropic import ChatAnthropic
from langchain_core.messages import HumanMessage, SystemMessage
from langgraph.checkpoint.memory import MemorySaver

from langchain_community.utilities.dalle_image_generator import DallEAPIWrapper
from langgraph.prebuilt import create_react_agent

​
Instagram Tooling

Next, we’re going to start building our Instagram tools. We are going to create 3 tools for Instagram:
  1. Reading DMs
  2. Sending a DM
  3. Posting content
For these, we’re going to create a class called InstagramTools. The class will manage the Dendrite browser and will contain the methods used for the tools metioned above. Let’s start with creating the class and initiating Dendrite.
agent.py
class InstagramTools:
    def __init__(self):
        self.browser = Dendrite(auth="instagram.com")
In the code above, we initiate the Dendrite browser with an authenticated session on instagram.com. Read more about authentication here.

​
Reading and Sending DMs

For our DM related tools, we’re going to create a utility function that navigates to the specified DM conversation. Inside the InstagramTools class, let’s create a goto_chat method.
agent.py
    # Inside InstagramTools

    def goto_chat(self, chat_name: str):
        browser = self.browser

        # Go to Instagram DM inbox and press button to open a chat
        browser.goto("https://www.instagram.com/direct/inbox/")
        browser.click("Icon button that creates a new chat")

        # Fill chat name in search field and wait for loading to complete
        browser.fill("Input for which user to send the message to", chat_name)
        time.sleep(3)

        # Select top item and press button to open chat
        browser.press("Tab")
        browser.press("Enter")
        browser.click("Button to open/start a chat in the 'send message' modal")
This method takes in a chat name, and navigates on the Instagram website just like a human would. Now it’s time to build the methods to read and send messages. Inside InstagramTools we’re creating send_message_in_chat and get_messages_from_chat, utilizing out goto_chat method for navigation.
agent.py
# Outside InstagramTools

class Message(BaseModel):
    sender: Literal["me", "other"]
    text: str
    date: str

class Chat(BaseModel):
    messages: List[Message]
agent.py
    # Inside InstagramTools

    # Sending messages
    def send_message_in_chat(self, message: str, chat_name: str):
        browser = self.browser

        # Open chat
        try:
            self.goto_chat(chat_name)
        except RuntimeError as e:
            return str(e)

        # Enter message and send
        browser.fill("The input where the user writes new messages", message)
        browser.press("Enter")

        return f"Message sent in chat with {chat_name}: '{message}'"

    # Retrieving messages
    def get_messages_from_chat(self, chat_name: str):
        browser = self.browser

        # Open chat
        try:
            self.goto_chat(chat_name)
        except RuntimeError as e:
            return str(e)

        # Extract messages
        chat: Chat = browser.extract(
            "The latest text messages in the current conversation. Skip any type of shared content.",
            type_spec=Chat,
        )

        return chat.messages
First we’re create the Pydantic models passed in to the extract method for structured data output. Then, we utilize the fill and press methods to send messages, and the extract method to extract messages.

​
Posting Content

Our last Instagram tool is for posting content. We will implement it using simple navigation and page interactions from the Dendrite SDK and using the upload_content method. This tool takes in the caption and image path as an argument. Later, we will create a utility function that generates an image with Dall-E and saves it locally.
agent.py
    # Inside InstagramTools

    def post_content(self, text: str, image_path: str):
        browser = self.browser

        # Go to Instagram and click button for creating a post
        browser.goto("https://www.instagram.com/")
        browser.wait_for("Loading to finish")
        browser.click(
            "Button in side bar menu that creates a new post",
            expected_outcome="A modal for creating a new post should appear",
        )

        # Upload image
        browser.click(
            "Button in the 'Create new post' modal for selecting upload content from the computer"
        )
        browser.upload_files(image_path)
        browser.wait_for(
            "Image to be added to the modal and the crop interface to appear"
        )

        # Press next until caption input field appears
        next_btn = browser.get_element("Next step button in modal")
        next_btn.click(expected_outcome="Side bar with filters appears")
        next_btn.click(expected_outcome="Side bar with a caption input field appears")

        # Fill in caption
        browser.fill("Caption input field for the new post", text)

        browser.click("The button for sharing the new post")
        browser.wait_for("Success modal that indicates that the post has been shared")

        return f"Image has been posted with caption: {text}"

​
Creating our LangChain Agent

Now it’s time to pass our web tools to a LangChain agent. For this, we’re going to create a main function and initialize the InstagramTools class. We’ll also create a util function for generating a config object for out agent.
agent.py
def main():
    global config

    # Get Instagram Tools
    ig_tools = InstagramTools()

    # Util function for generating config for agent
    generate_config = lambda thread_id=None: {
        "configurable": {
            "thread_id": thread_id or datetime.now().strftime("%Y%m%d_%H%M%S")
        }
    }
The next step is to define the tools for the agent using the @tool decorator from LangChain. We’re also creating a quick function for generating an image with Dall-E, which can be used to generate an image for our upload_post tool.
agent.py
    # Inside main

    # Create tools for agent
    @tool
    def get_messages(user_name: str):
        """Get latest instagram messages from a chat with a specific user based on their username"""
        return ig_tools.get_messages_from_chat(user_name)

    @tool
    def send_message(message: str, user_name: str):
        """Send a direct Instagram message to a specific user based on their username.
        IMPORTANT: Only use this tool after explicitly asking the user for the message content and receiving their approval.
        """
        return ig_tools.send_message_in_chat(message, user_name)

    @tool
    def upload_post(caption: str, image_url: str):
        """Upload a post to the user's Instagram account."""

        image_path = download_image(image_url)

        return ig_tools.post_content(caption, image_path)

    @tool
    def generate_image(prompt: str):
        """Generate an image from a prompt and return the URL to the user.
        IMPORTANT: If the prompt from the user is not very descriptive, write a new, more detailed prompt based on the user input that you use to invoke this tool.
        """

        url = DallEAPIWrapper(model="dall-e-3").run(prompt)

        return url

    # Util function for saving image locally from url
    def download_image(url):
        directory = "test/saved_images"
        os.makedirs(directory, exist_ok=True)

        response = requests.get(url)

        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
        filename = f"image_{timestamp}.png"

        print("Response code for image: ", response.status_code)

        if response.status_code == 200:
            filepath = os.path.join(directory, filename)

            with open(filepath, "wb") as file:
                file.write(response.content)

            return filepath
        else:
            raise RuntimeError("Failed to download image")
Great, now it’s time to actually create the agent, configure it and pass our tools to it!
agent.py
    # Inside main

    # Create the agent with Memory, Model, System Prompt and Tools
    memory = MemorySaver()
    model = ChatAnthropic(model_name="claude-3-sonnet-20240229")
    system_prompt = SystemMessage(
        content="""You are a helpful AI Agent called 'Igor the AI Agent' developed by Dendrite that is specialized in doing Instagram actions on behalf of the user.
    You have been provided tools to do this reliably.
    """
    )
    tools = [
        get_messages,
        send_message,
        generate_image,
        upload_post,
    ]

    # Initiate ReAct Agent
    agent_executor = create_react_agent(
        model, tools, checkpointer=memory, state_modifier=system_prompt
    )
Now that we have our agent_executor, the last step is to run it in a loop where the human writes a message and the answer from the agent is streamed to the console.
agent.py
    # Inside main

    # Utils
    config = generate_config()
    separator = "-------"

    # Create chat loop between Human and Agent in console
    while True:

        # Get human message input
        user_input = input("User: ")
        print(separator)
        if user_input.lower() in ["quit", "exit", "q"]:
            print("Goodbye!")
            break

        # Add new human message to agent and stream response
        for event in agent_executor.stream(
            {"messages": [HumanMessage(content=user_input)]}, config
        ):
            for value in event.values():
                print("Assistant:", value["messages"][-1].content)
                print(separator)
Finally, simply call the main function
agent.py
main()

​
Final Result

Et voilà! A fully functioning Instagram agent built with LangChain and Dendrite.
agent.py
import time
from datetime import datetime
import os
from typing import List, Literal

from dendrite import Dendrite

from pydantic import BaseModel
import requests

from langchain.tools import tool

from langchain_anthropic import ChatAnthropic
from langchain_core.messages import HumanMessage, SystemMessage
from langgraph.checkpoint.memory import MemorySaver

from langchain_community.utilities.dalle_image_generator import DallEAPIWrapper
from langgraph.prebuilt import create_react_agent

class Message(BaseModel):
    sender: Literal["me", "other"]
    text: str
    date: str

class Chat(BaseModel):
    messages: List[Message]


class InstagramTools:
    def __init__(self):
        self.browser = Dendrite(auth="instagram.com")

    def goto_chat(self, chat_name: str):
        browser = self.browser

        # Go to Instagram DM inbox and press button to open a chat
        browser.goto("https://www.instagram.com/direct/inbox/")
        browser.click("Icon button that creates a new chat")

        # Fill chat name in search field and wait for loading to complete
        browser.fill("Input for which user to send the message to", chat_name)
        time.sleep(3)

        # Select top item and press button to open chat
        browser.press("Tab")
        browser.press("Enter")
        browser.click("Button to open/start a chat in the 'send message' modal")

    def send_message_in_chat(self, message: str, chat_name: str):
        browser = self.browser

        # Open chat
        try:
            self.goto_chat(chat_name)
        except RuntimeError as e:
            return str(e)

        # Enter message and send
        browser.fill("The input where the user writes new messages", message)
        browser.press("Enter")

        return f"Message sent in chat with {chat_name}: '{message}'"

    def get_messages_from_chat(self, chat_name: str):
        browser = self.browser

        # Open chat
        try:
            self.goto_chat(chat_name)
        except RuntimeError as e:
            return str(e)

        # Extract messages
        chat: Chat = browser.extract(
            "The latest text messages in the current conversation. Skip any type of shared content.",
            type_spec=Chat,
        )

        return chat.messages

    def post_content(self, text: str, image_path: str):
        browser = self.browser

        # Go to Instagram and click button for creating a post
        browser.goto("https://www.instagram.com/")
        browser.wait_for("Loading to finish")
        browser.click(
            "Button in side bar menu that creates a new post",
            expected_outcome="A modal for creating a new post should appear",
        )

        # Upload image
        browser.click(
            "Button in the 'Create new post' modal for selecting upload content from the computer"
        )
        browser.upload_files(image_path)
        browser.wait_for(
            "Image to be added to the modal and the crop interface to appear"
        )

        # Press next until caption input field appears
        next_btn = browser.get_element("Next step button in modal")
        next_btn.click(expected_outcome="Side bar with filters appears")
        next_btn.click(expected_outcome="Side bar with a caption input field appears")

        # Fill in caption
        browser.fill("Caption input field for the new post", text)

        browser.click("The button for sharing the new post")
        browser.wait_for("Success modal that indicates that the post has been shared")

        return f"Image has been posted with caption: {text}"


def main():
    global config

    # Get Instagram Tools
    ig_tools = InstagramTools()

    # Util function for generating config for agent
    generate_config = lambda thread_id=None: {
        "configurable": {
            "thread_id": thread_id or datetime.now().strftime("%Y%m%d_%H%M%S")
        }
    }

    # Create tools for agent
    @tool
    def get_messages(user_name: str):
        """Get latest instagram messages from a chat with a specific user based on their username"""
        return ig_tools.get_messages_from_chat(user_name)

    @tool
    def send_message(message: str, user_name: str):
        """Send a direct Instagram message to a specific user based on their username.
        IMPORTANT: Only use this tool after explicitly asking the user for the message content and receiving their approval.
        """
        return ig_tools.send_message_in_chat(message, user_name)

    @tool
    def upload_post(caption: str, image_url: str):
        """Upload a post to the user's Instagram account."""

        image_path = download_image(image_url)

        return ig_tools.post_content(caption, image_path)

    @tool
    def generate_image(prompt: str):
        """Generate an image from a prompt and return the URL to the user.
        IMPORTANT: If the prompt from the user is not very descriptive, write a new, more detailed prompt based on the user input that you use to invoke this tool.
        """

        url = DallEAPIWrapper(model="dall-e-3").run(prompt)

        return url

    # Util function for saving image locally from url
    def download_image(url):
        directory = "test/saved_images"
        os.makedirs(directory, exist_ok=True)

        response = requests.get(url)

        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
        filename = f"image_{timestamp}.png"

        print("Response code for image: ", response.status_code)

        if response.status_code == 200:
            filepath = os.path.join(directory, filename)

            with open(filepath, "wb") as file:
                file.write(response.content)

            return filepath
        else:
            raise RuntimeError("Failed to download image")

    # Create the agent with Memory, Model, System Prompt and Tools
    memory = MemorySaver()
    model = ChatAnthropic(model_name="claude-3-sonnet-20240229")
    system_prompt = SystemMessage(
        content="""You are a helpful AI Agent called 'Igor the AI Agent' developed by Dendrite that is specialized in doing Instagram actions on behalf of the user.
    You have been provided tools to do this reliably.
    """
    )
    tools = [
        get_messages,
        send_message,
        generate_image,
        upload_post,
    ]

    # Initiate ReAct Agent
    agent_executor = create_react_agent(
        model, tools, checkpointer=memory, state_modifier=system_prompt
    )

    # Utils
    config = generate_config()
    separator = "-------"

    # Create chat loop between Human and Agent in console
    while True:

        # Get human message input
        user_input = input("User: ")
        print(separator)
        if user_input.lower() in ["quit", "exit", "q"]:
            print("Goodbye!")
            break

        # Add new human message to agent and stream response
        for event in agent_executor.stream(
            {"messages": [HumanMessage(content=user_input)]}, config
        ):
            for value in event.values():
                print("Assistant:", value["messages"][-1].content)
                print(separator)


main()