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[!NOTE] Get your API key here.

📖 Table of Contents

• Call for Contributors 🌟
• Introduction
• Key Features
• Quick Example
• Installation
• Python Quick Start 🐍
• Node.js Quick Start 🟩
• Components
  • Mental Model
• Concepts
• Understanding Tasks
  • Lifecycle of a Task
  • Types of Workflow Steps
  • Common Steps
  • Key-Value Steps
  • Iteration Steps
  • Conditional Steps
  • Other Control Flow
• Tool Types
  • User-defined functions
  • system tools
  • Available system resources and operations
  • Built-in integrations
  • Direct api_calls
• Integrations
• Other Features
  • Adding Tools to Agents
  • Managing Sessions and Users
  • Document Integration and Search
• Reference
  • SDK Reference
  • API Reference
• Local Quickstart
• What's the difference between Julep and LangChain etc?
  • Different Use Cases
  • Different Form Factor
  • In Summary

Introduction

Julep is a platform for creating AI agents that remember past interactions and can perform complex tasks. It offers long-term memory and manages multi-step processes.

Julep enables the creation of multi-step tasks incorporating decision-making, loops, parallel processing, and integration with numerous external tools and APIs.

While many AI applications are limited to simple, linear chains of prompts and API calls with minimal branching, Julep is built to handle more complex scenarios which:

• have multiple steps,
• make decisions based on model outputs,
• spawn parallel branches,
• use lots of tools, and
• run for a long time.

[!TIP] Imagine you want to build an AI agent that can do more than just answer simple questions—it needs to handle complex tasks, remember past interactions, and maybe even use other tools or APIs. That's where Julep comes in. Read Understanding Tasks to learn more.

Key Features

1. 🧠 Persistent AI Agents: Remember context and information over long-term interactions.
2. 💾 Stateful Sessions: Keep track of past interactions for personalized responses.
3. 🔄 Multi-Step Tasks: Build complex, multi-step processes with loops and decision-making.
4. ⏳ Task Management: Handle long-running tasks that can run indefinitely.
5. 🛠️ Built-in Tools: Use built-in tools and external APIs in your tasks.
6. 🔧 Self-Healing: Julep will automatically retry failed steps, resend messages, and generally keep your tasks running smoothly.
7. 📚 RAG: Use Julep's document store to build a system for retrieving and using your own data.

[!TIP] Julep is ideal for applications that require AI use cases beyond simple prompt-response models.

Quick Example

Imagine a Research AI agent that can do the following:

1. Take a topic,
2. Come up with 30 search queries for that topic,
3. Perform those web searches in parallel,
4. Summarize the results,
5. Send the summary to Discord.

[!NOTE] In Julep, this would be a single task under 80 lines of code and run fully managed all on its own. All of the steps are executed on Julep's own servers and you don't need to lift a finger.

Here's a working example:

name: Research Agent

# Optional: Define the input schema for the task
input_schema:
  type: object
  properties:
    topic:
      type: string
      description: The main topic to research
    num_questions:
      type: integer
      description: The number of search queries to generate

# Define the tools that the agent can use
tools:
  - name: web_search
    type: integration
    integration:
      provider: brave
      setup:
        api_key: <your-brave-api-key>

  - name: discord_webhook
    type: api_call
    api_call:
      url: https://discord.com/api/webhooks/<your-webhook-id>/<your-webhook-token>
      method: POST
      headers:
        Content-Type: application/json

# Special variables:
# - inputs: for accessing the input to the task
# - outputs: for accessing the output of previous steps
# - _: for accessing the output of the previous step

# Define the main workflow
main:
- prompt:
    - role: system
      content: >-
        You are a research assistant.
        Generate {{inputs[0].num_questions|default(30, true)}} diverse search queries related to the topic:
        {{inputs[0].topic}}

        Write one query per line.
  unwrap: true

# Evaluate the search queries using a simple python expression
- evaluate:
    search_queries: "_.split(NEWLINE)"

# Run the web search in parallel for each query
- over: "_.search_queries"
  map:
    tool: web_search
    arguments:
      query: "_"
  parallelism: 5

# Collect the results from the web search
- evaluate:
    search_results: _

# Summarize the results
- prompt:
    - role: system
      content: >
        You are a research summarizer. Create a comprehensive summary of the following research results on the topic {{inputs[0].topic}}.
        The summary should be well-structured, informative, and highlight key findings and insights. Keep the summary concise and to the point.
        The length of the summary should be less than 150 words.
        Here are the search results:
        {{_.search_results}}
  unwrap: true
  settings:
    model: gpt-4o-mini

- evaluate:
    discord_message: |-
      f'''
      **Research Summary for {inputs[0].topic}**
      {_}
      '''

  # Send the summary to Discord
- tool: discord_webhook
  arguments:
    json_: 
      content: _.discord_message[:2000] # Discord has a 2000 character limit

In this example, Julep will automatically manage parallel executions, retry failed steps, resend API requests, and keep the tasks running reliably until completion.

This runs in under 30 seconds and returns the following output:

Installation

To get started with Julep, install it using npm or pip:

Node.js:

npm install @julep/sdk

# or

bun add @julep/sdk

Python:

pip install julep

[!NOTE] Get your API key here.

While we are in beta, you can also reach out on Discord to get rate limits lifted on your API key.

[!TIP] 💻 Are you a show me the code!™ kind of person? We have created a ton of cookbooks for you to get started with. Check out the cookbooks to browse through examples.

💡 There's also lots of ideas that you can build on top of Julep. Check out the list of ideas to get some inspiration.

Python Quick Start 🐍

### Step 0: Setup

import time
import yaml
from julep import Julep # or AsyncJulep

client = Julep(api_key="your_julep_api_key")

### Step 1: Create an Agent

agent = client.agents.create(
    name="Storytelling Agent",
    model="claude-3.5-sonnet",
    about="You are a creative storyteller that crafts engaging stories on a myriad of topics.",
)

### Step 2: Create a Task that generates a story and comic strip

task_yaml = """
name: Storyteller
description: Create a story based on an idea.

tools:
  - name: research_wikipedia
    type: integration
    integration:
      provider: wikipedia
      method: search

main:
  # Step 1: Generate plot idea
  - prompt:
      - role: system
        content: You are {{agent.name}}. {{agent.about}}
      - role: user
        content: >
          Based on the idea '{{_.idea}}', generate a list of 5 plot ideas. Go crazy and be as creative as possible. Return your output as a list of long strings inside ```yaml tags at the end of your response.
    unwrap: true

  - evaluate:
      plot_ideas: load_yaml(_.split('```yaml')[1].split('```')[0].strip())

  # Step 2: Extract research fields from the plot ideas
  - prompt:
      - role: system
        content: You are {{agent.name}}. {{agent.about}}
      - role: user
        content: >
          Here are some plot ideas for a story:
          {% for idea in _.plot_ideas %}
          - {{idea}}
          {% endfor %}

          To develop the story, we need to research for the plot ideas.
          What should we research? Write down wikipedia search queries for the plot ideas you think are interesting.
          Return your output as a yaml list inside ```yaml tags at the end of your response.
    unwrap: true
    settings:
      model: gpt-4o-mini
      temperature: 0.7

  - evaluate:
      research_queries: load_yaml(_.split('```yaml')[1].split('```')[0].strip())

  # Step 3: Research each plot idea
  - foreach:
      in: _.research_queries
      do:
        tool: research_wikipedia
        arguments:
          query: _

  - evaluate:
      wikipedia_results: 'NEWLINE.join([f"- {doc.metadata.title}: {doc.metadata.summary}" for item in _ for doc in item.documents])'

  # Step 4: Think and deliberate
  - prompt:
      - role: system
        content: You are {{agent.name}}. {{agent.about}}
      - role: user
        content: |-
          Before we write the story, let's think and deliberate. Here are some plot ideas:
          {% for idea in outputs[1].plot_ideas %}
          - {{idea}}
          {% endfor %}

          Here are the results from researching the plot ideas on Wikipedia:
          {{_.wikipedia_results}}

          Think about the plot ideas critically. Combine the plot ideas with the results from Wikipedia to create a detailed plot for a story.
          Write down all your notes and thoughts.
          Then finally write the plot as a yaml object inside ```yaml tags at the end of your response. The yaml object should have the following structure:

          ```yaml
          title: "<string>"
          characters:
          - name: "<string>"
            about: "<string>"
          synopsis: "<string>"
          scenes:
          - title: "<string>"
            description: "<string>"
            characters:
            - name: "<string>"
              role: "<string>"
            plotlines:
            - "<string>"```

          Make sure the yaml is valid and the characters and scenes are not empty. Also take care of semicolons and other gotchas of writing yaml.
    unwrap: true

  - evaluate:
      plot: "load_yaml(_.split('```yaml')[1].split('```')[0].strip())"
"""

task = client.tasks.create(
    agent_id=agent.id,
    **yaml.safe_load(task_yaml)
)

### Step 3: Execute the Task

execution = client.executions.create(
    task_id=task.id,
    input={"idea": "A cat who learns to fly"}
)

# 🎉 Watch as the story and comic panels are generated
while (result := client.executions.get(execution.id)).status not in ['succeeded', 'failed']:
    print(result.status, result.output)
    time.sleep(1)

# 📦 Once the execution is finished, retrieve the results
if result.status == "succeeded":
    print(result.output)
else:
    raise Exception(result.error)

You can find the full python example here.

 | 

Node.js Quick Start 🟩

// Step 0: Setup
const dotenv = require("dotenv");
const { Julep } = require("@julep/sdk");
const yaml = require("yaml");

dotenv.config();

const client = new Julep({
  apiKey: process.env.JULEP_API_KEY,
  environment: process.env.JULEP_ENVIRONMENT || "production",
});

/* Step 1: Create an Agent */

async function createAgent() {
  const agent = await client.agents.create({
    name: "Storytelling Agent",
    model: "claude-3.5-sonnet",
    about:
      "You are a creative storyteller that crafts engaging stories on a myriad of topics.",
  });
  return agent;
}

/* Step 2: Create a Task that generates a story and comic strip */

const taskYaml = `
name: Storyteller
description: Create a story based on an idea.

tools:
  - name: research_wikipedia
    integration:
      provider: wikipedia
      method: search

main:
  # Step 1: Generate plot idea
  - prompt:
      - role: system
        content: You are {{agent.name}}. {{agent.about}}
      - role: user
        content: >
          Based on the idea '{{_.idea}}', generate a list of 5 plot ideas. Go crazy and be as creative as possible. Return your output as a list of long strings inside \`\`\`yaml tags at the end of your response.
    unwrap: true

  - evaluate:
      plot_ideas: load_yaml(_.split('\`\`\`yaml')[1].split('\`\`\`')[0].strip())

  # Step 2: Extract research fields from the plot ideas
  - prompt:
      - role: system
        content: You are {{agent.name}}. {{agent.about}}
      - role: user
        content: >
          Here are some plot ideas for a story:
          {% for idea in _.plot_ideas %}
          - {{idea}}
          {% endfor %}

          To develop the story, we need to research for the plot ideas.
          What should we research? Write down wikipedia search queries for the plot ideas you think are interesting.
          Return your output as a yaml list inside \`\`\`yaml tags at the end of your response.
    unwrap: true
    settings:
      model: gpt-4o-mini
      temperature: 0.7

  - evaluate:
      research_queries: load_yaml(_.split('\`\`\`yaml')[1].split('\`\`\`')[0].strip())

  # Step 3: Research each plot idea
  - foreach:
      in: _.research_queries
      do:
        tool: research_wikipedia
        arguments:
          query: _

  - evaluate:
      wikipedia_results: 'NEWLINE.join([f"- {doc.metadata.title}: {doc.metadata.summary}" for item in _ for doc in item.documents])'

  # Step 4: Think and deliberate
  - prompt:
      - role: system
        content: You are {{agent.name}}. {{agent.about}}
      - role: user
        content: |-
          Before we write the story, let's think and deliberate. Here are some plot ideas:
          {% for idea in outputs[1].plot_ideas %}
          - {{idea}}
          {% endfor %}

          Here are the results from researching the plot ideas on Wikipedia:
          {{_.wikipedia_results}}

          Think about the plot ideas critically. Combine the plot ideas with the results from Wikipedia to create a detailed plot for a story.
          Write down all your notes and thoughts.
          Then finally write the plot as a yaml object inside \`\`\`yaml tags at the end of your response. The yaml object should have the following structure:

          \`\`\`yaml
          title: "<string>"
          characters:
          - name: "<string>"
            about: "<string>"
          synopsis: "<string>"
          scenes:
          - title: "<string>"
            description: "<string>"
            characters:
            - name: "<string>"
              role: "<string>"
            plotlines:
            - "<string>"\`\`\`

          Make sure the yaml is valid and the characters and scenes are not empty. Also take care of semicolons and other gotchas of writing yaml.
    unwrap: true

  - evaluate:
      plot: "load_yaml(_.split('\`\`\`yaml')[1].split('\`\`\`')[0].strip())"
`;

async function createTask(agentId) {
  const task = await client.tasks.create(agentId, yaml.parse(taskYaml));
  return task;
}

/* Step 3: Execute the Task */

async function executeTask(taskId) {
  const execution = await client.executions.create(taskId, {
    input: { idea: "A cat who learns to fly" },
  });

  // 🎉 Watch as the story and comic panels are generated
  while (true) {
    const result = await client.executions.get(execution.id);
    console.log(result.status, result.output);

    if (result.status === "succeeded" || result.status === "failed") {
      // 📦 Once the execution is finished, retrieve the results
      if (result.status === "succeeded") {
        console.log(result.output);
      } else {
        throw new Error(result.error);
      }
      break;
    }

    await new Promise((resolve) => setTimeout(resolve, 1000));
  }
}

// Main function to run the example
async function main() {
  try {
    const agent = await createAgent();
    const task = await createTask(agent.id);
    await executeTask(task.id);
  } catch (error) {
    console.error("An error occurred:", error);
  }
}

main()
  .then(() => console.log("Done"))
  .catch(console.error);

You can find the full Node.js example here.

 | 

Components

Julep is made up of the following components:

• Julep Platform: The Julep platform is a cloud service that runs your workflows. It includes a language for describing workflows, a server for running those workflows, and an SDK for interacting with the platform.
• Julep SDKs: Julep SDKs are a set of libraries for building workflows. There are SDKs for Python and JavaScript, with more on the way.
• Julep API: The Julep API is a RESTful API that you can use to interact with the Julep platform.

Mental Model

Think of Julep as a platform that combines both client-side and server-side components to help you build advanced AI agents. Here's how to visualize it:

1. Your Application Code:

   • You can use the Julep SDK in your application to define agents, tasks, and workflows.
   • The SDK provides functions and classes that make it easy to set up and manage these components.

2. Julep Backend Service:

   • The SDK communicates with the Julep backend over the network.
   • The backend handles execution of tasks, maintains session state, stores documents, and orchestrates workflows.

3. Integration with Tools and APIs:

   • Within your workflows, you can integrate external tools and services.
   • The backend facilitates these integrations, so your agents can, for example, perform web searches, access databases, or call third-party APIs.

Concepts

Julep is built on several key technical components that work together to create powerful AI workflows:

graph TD
    User[User] ==> Session[Session]
    Session --> Agent[Agent]
    Agent --> Tasks[Tasks]
    Agent --> LLM[Large Language Model]
    Tasks --> Tools[Tools]
    Agent --> Documents[Documents]
    Documents --> VectorDB[Vector Database]
    Tasks --> Executions[Executions]

    classDef client fill:#9ff,stroke:#333,stroke-width:1px;
    class User client;

    classDef core fill:#f9f,stroke:#333,stroke-width:2px;
    class Agent,Tasks,Session core;

• Agents: AI-powered entities backed by large language models (LLMs) that execute tasks and interact with users.
• Users: Entities that interact with agents through sessions.
• Sessions: Stateful interactions between agents and users, maintaining context across multiple exchanges.
• Tasks: Multi-step, programmatic workflows that agents can execute, including various types of steps like prompts, tool calls, and conditional logic.
• Tools: Integrations that extend an agent's capabilities, including user-defined functions, system tools, or third-party API integrations.
• Documents: Text or data objects associated with agents or users, vectorized and stored for semantic search and retrieval.
• Executions: Instances of tasks that have been initiated with specific inputs, with their own lifecycle and state machine.

 | 

Understanding Tasks

Tasks are the core of Julep's workflow system. They allow you to define complex, multi-step AI workflows that your agents can execute. Here's a brief overview of task components:

• Name, Description and Input Schema: Each task has a unique name and description for easy identification. An input schema (optional) that is used to validate the input to the task.
• Main Steps: The core of a task, defining the sequence of actions to be performed. Each step can be a prompt, tool call, evaluate, wait_for_input, log, get, set, foreach, map_reduce, if-else, switch, sleep, or return. (See Types of Workflow Steps for more details)
• Tools: Optional integrations that extend the capabilities of your agent during task execution.

Lifecycle of a Task

You create a task using the Julep SDK and specify the main steps that the agent will execute. When you execute a task, the following lifecycle happens:

sequenceDiagram
    participant D as Your Code
    participant C as Julep Client
    participant S as Julep Server

    D->>C: Create Task
    C->>S: Submit Execution
    Note over S: Execute Task
    Note over S: Manage State
    S-->>C: Execution Events
    C-->>D: Progress Updates
    S->>C: Execution Completion
    C->>D: Final Result

Types of Workflow Steps

Tasks in Julep can include various types of steps, allowing you to create complex and powerful workflows. Here's an overview of the available step types:

Common Steps

Key-Value Steps

Iteration Steps

Conditional Steps

Other Control Flow

Each step type serves a specific purpose in building sophisticated AI workflows. This categorization helps in understanding the various control flows and operations available in Julep tasks.

 | 

Tool Types

Agents can be given access to a number of "tools" -- any programmatic interface that a foundation model can "call" with a set of inputs to achieve a goal. For example, it might use a web_search(query) tool to search the Internet for some information.

Unlike agent frameworks, julep is a backend that manages agent execution. Clients can interact with agents using our SDKs. julep takes care of executing tasks and running integrations.

Tools in julep can be one of:

1. User-defined functions: These are function signatures that you can give the model to choose from, similar to how [openai]'s function-calling works. They need to be handled by the client. The workflow will pause until the client calls the function and gives the results back to julep.
2. system tools: Built-in tools that can be used to call the julep APIs themselves, like triggering a task execution, appending to a metadata field, etc.
3. integrations: Built-in third party tools that can be used to extend the capabilities of your agents.
4. api_calls: Direct api calls during workflow executions as tool calls.

User-defined functions

These are function signatures that you can give the model to choose from, similar to how [openai]'s function-calling works. An example:

name: Example system tool task
description: List agents using system call

tools:
  - name: send_notification
    description: Send a notification to the user
    type: function
    function:
      parameters:
        type: object
        properties:
          text:
            type: string
            description: Content of the notification

main:
  - tool: send_notification
    arguments:
      content: '"hi"' # <-- python expression

Whenever julep encounters a user-defined function, it pauses, giving control back to the client and waits for the client to run the function call and give the results back to julep.

system tools

Built-in tools that can be used to call the julep APIs themselves, like triggering a task execution, appending to a metadata field, etc.

system tools are built into the backend. They get executed automatically when needed. They do not require any action from the client-side.

For example,

name: Example system tool task
description: List agents using system call

tools:
  - name: list_agent_docs
    description: List all docs for the given agent
    type: system
    system:
      resource: agent
      subresource: doc
      operation: list

main:
  - tool: list_agents
    arguments:
      limit: 10 # <-- python expression

Available system resources and operations

• agent:

  • list: List all agents.
  • get: Get a single agent by id.
  • create: Create a new agent.
  • update: Update an existing agent.
  • delete: Delete an existing agent.

• user:

  • list: List all users.
  • get: Get a single user by id.
  • create: Create a new user.
  • update: Update an existing user.
  • delete: Delete an existing user.

• session:

  • list: List all sessions.
  • get: Get a single session by id.
  • create: Create a new session.
  • update: Update an existing session.
  • delete: Delete an existing session.
  • chat: Chat with a session.
  • history: Get the chat history with a session.

• task:

  • list: List all tasks.
  • get: Get a single task by id.
  • create: Create a new task.
  • update: Update an existing task.
  • delete: Delete an existing task.

• doc (subresource for agent and user):

  • list: List all documents.
  • create: Create a new document.
  • delete: Delete an existing document.
  • search: Search for documents.

Additional operations available for some resources:

• embed: Embed a resource (specific resources not specified in the provided code).
• change_status: Change the status of a resource (specific resources not specified in the provided code).
• chat: Chat with a resource (specific resources not specified in the provided code).
• history: Get the chat history with a resource (specific resources not specified in the provided code).
• create_or_update: Create a new resource or update an existing one (specific resources not specified in the provided code).

Note: The availability of these operations may vary depending on the specific resource and implementation details.

[!TIP] > Example cookbook: cookbooks/06-browser-use.ipynb

Built-in integrations

Julep comes with a number of built-in integrations (as described in the section below). integration tools are directly executed on the julep backend. Any additional parameters needed by them at runtime can be set in the agent/session/user's metadata fields.

See Integrations for details on the available integrations.

[!TIP] > Example cookbook: cookbooks/01-website-crawler.ipynb

Direct api_calls

julep can also directly make api calls during workflow executions as tool calls. Same as integrations, additional runtime parameters are loaded from metadata fields.

For example,

name: Example api_call task
tools:
  - type: api_call
    name: hello
    api_call:
      method: GET
      url: https://httpbin.org/get

main:
  - tool: hello
    arguments:
      json:
        test: _.input # <-- python expression

 | 

Integrations

Julep supports various integrations that extend the capabilities of your AI agents. Here's a list of available integrations and their supported arguments:

For more details, refer to our Integrations Documentation.

 | 

Other Features

Julep offers a range of advanced features to enhance your AI workflows:

Adding Tools to Agents

Extend your agent's capabilities by integrating external tools and APIs:

client.agents.tools.create(
    agent_id=agent.id,
    name="web_search",
    description="Search the web for information.",
    integration={
        "provider": "brave",
        "method": "search",
        "setup": {"api_key": "your_brave_api_key"},
    },
)

Managing Sessions and Users

Julep provides robust session management for persistent interactions:

session = client.sessions.create(
    agent_id=agent.id,
    user_id=user.id,
    context_overflow="adaptive"
)

# Continue conversation in the same session
response = client.sessions.chat(
    session_id=session.id,
    messages=[
      {
        "role": "user",
        "content": "Follow up on the previous conversation."
      }
    ]
)

Document Integration and Search

Easily manage and search through documents for your agents:

# Upload a document
document = client.agents.docs.create(
    title="AI advancements",
    content="AI is changing the world...",
    metadata={"category": "research_paper"}
)

# Search documents
results = client.agents.docs.search(
    text="AI advancements",
    metadata_filter={"category": "research_paper"}
)

 | 

Reference

SDK Reference

• Node.js SDK Reference | NPM Package
• Python SDK Reference | PyPI Package

API Reference

Explore our API documentation to learn more about agents, tasks, and executions:

• Agents API
• Tasks API
• Executions API

 | 

Local Quickstart

Requirements:

• latest docker compose installed

Steps:

1. git clone https://github.com/julep-ai/julep.git
2. cd julep
3. docker volume create cozo_backup
4. docker volume create cozo_data
5. cp .env.example .env # <-- Edit this file
6. docker compose --env-file .env --profile temporal-ui --profile single-tenant --profile self-hosted-db up --build

 | 

What's the difference between Julep and LangChain etc?

Different Use Cases

Think of LangChain and Julep as tools with different focuses within the AI development stack.

LangChain is great for creating sequences of prompts and managing interactions with LLMs. It has a large ecosystem with lots of pre-built integrations, which makes it convenient if you want to get something up and running quickly. LangChain fits well with simple use cases that involve a linear chain of prompts and API calls.

Julep, on the other hand, is more about building persistent AI agents that can maintain context over long-term interactions. It shines when you need complex workflows that involve multi-step tasks, conditional logic, and integration with various tools or APIs directly within the agent's process. It's designed from the ground up to manage persistent sessions and complex workflows.

Use Julep if you imagine building a complex AI assistant that needs to:

• Keep track of user interactions over days or weeks.
• Perform scheduled tasks, like sending daily summaries or monitoring data sources.
• Make decisions based on prior interactions or stored data.
• Interact with multiple external services as part of its workflow.

Then Julep provides the infrastructure to support all that without you having to build it from scratch.

Different Form Factor

Julep is a platform that includes a language for describing workflows, a server for running those workflows, and an SDK for interacting with the platform. In order to build something with Julep, you write a description of the workflow in YAML, and then run the workflow in the cloud.

Julep is built for heavy-lifting, multi-step, and long-running workflows and there's no limit to how complex the workflow can be.

LangChain is a library that includes a few tools and a framework for building linear chains of prompts and tools. In order to build something with LangChain, you typically write Python code that configures and runs the model chains you want to use.

LangChain might be sufficient and quicker to implement for simple use cases that involve a linear chain of prompts and API calls.

In Summary

Use LangChain when you need to manage LLM interactions and prompt sequences in a stateless or short-term context.

Choose Julep when you need a robust framework for stateful agents with advanced workflow capabilities, persistent sessions, and complex task orchestration.

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