
Open-source TypeScript agent harness framework for building autonomous agents and AI workflows.
Open-source TypeScript agent harness framework for building autonomous agents and AI workflows.
Flue is an open-source TypeScript framework — described as an agent harness rather than another SDK — for building autonomous agents and AI workflows. It gives any model the context and environment needed for autonomous work: sessions, tools, skills, instructions, filesystem access, and a secure sandbox to run in. Developers can build agents that keep context across conversations and events, run structured workflows where code guides agent reasoning, and define specialized subagents that delegate work to the right expert. Flue includes durable execution so agents preserve progress through failures and restarts, typed tools for calling APIs and querying data, and MCP server support to connect agents to authenticated tools via the Model Context Protocol. Agents can run locally via CLI or be deployed to a hosted runtime, with observability through OpenTelemetry and Braintrust.
Flue is an open-source framework built with TypeScript that enables the development of autonomous agents and AI workflows. It allows developers to create intelligent applications that can operate independently, making it a powerful tool for automating tasks and processes in various domains.
Flue provides a structured environment for creating autonomous agents that can handle complex workflows. By leveraging TypeScript, developers benefit from static typing, which helps to catch errors early in the development process. This framework is particularly useful in scenarios such as:
To get started with Flue, developers can clone the repository from GitHub and follow the installation instructions provided in the documentation. It's designed to be modular, allowing users to integrate various libraries and tools to expand its capabilities.
Common pitfalls to avoid include neglecting error handling within agents and failing to document the workflow processes adequately, which can lead to confusion later.
Flue operates by integrating various components such as programmable harnesses, autonomous agents, structured workflows, and secure sandboxes to enable the creation of intelligent agents. These agents can handle complex tasks, maintain contextual awareness, and execute processes safely, enhancing automation and efficiency.
Flue is a powerful framework designed to facilitate the development of autonomous agents that can perform complex tasks autonomously. Here’s how its core components work:
Agent Harness: This is a programmable TypeScript harness that provides agents with sessions, tools, skills, instructions, and filesystem access. It allows developers to customize agent behavior tailored to specific requirements.
Autonomous Agents: These agents can engage in conversations and maintain context over time, allowing them to work toward defined goals. For instance, a customer service bot can remember previous interactions, ensuring a seamless experience for users.
Workflows: Flue supports structured automations where the code guides the agent's reasoning from input to output. This is particularly beneficial in scenarios like data processing where multiple steps must be executed in a specific order.
Secure Sandboxes: To ensure safety, agents operate within isolated environments. This feature allows them to use tools and modify files without risking the integrity of the host system. For example, a data analysis agent can process sensitive files without exposing them to security threats.
Durable Execution: Agents built with Flue can preserve their progress and recover from failures or restarts. This is essential for long-running tasks, ensuring that work is not lost and can continue from the last checkpoint.
Deployment Options: Developers can run agents locally during development via the command line interface (CLI) and later deploy them to hosted runtimes, ensuring flexibility in development and production environments.
Tool Integration: Flue allows for seamless integration with authenticated services using MCP servers, enabling agents to perform real-time actions across platforms.
Flue's main features include a programmable TypeScript harness, autonomous agents that maintain context, structured workflows for automations, secure sandboxes for safe tool usage, and durable execution that ensures agents preserve progress and recover from failures. These elements make Flue a versatile tool for developing intelligent applications.
Flue is designed to facilitate the development of advanced AI applications with several robust features:
Agent Harness: This feature provides a programmable TypeScript framework, enabling developers to create custom agents with various capabilities. The harness allows models to have access to sessions, tools, skills, instructions, and even the filesystem, which can significantly enhance their functionality.
Autonomous Agents: Flue enables the creation of agents that can maintain context throughout multiple interactions. This means that agents can remember previous conversations and events, allowing for more natural and effective communication with users. For instance, a customer support agent can recall past issues a user faced, providing a seamless experience.
Workflows: With Flue, developers can run structured automations that allow agents to reason through inputs and produce final outputs efficiently. This structured approach to automation is crucial in applications like data processing or complex decision-making tasks, where a step-by-step flow is essential.
Secure Sandboxes: Flue introduces secure sandboxes, which provide agents with isolated environments. In these sandboxes, agents can safely utilize tools, modify files, and perform real tasks without risking system integrity. This is particularly important in applications that handle sensitive information.
Durable Execution: This feature ensures that agents can preserve their progress even in the face of failures or system restarts. By implementing durable execution, developers can create more resilient applications that can recover from interruptions without losing critical data or context.
Flue is designed for developers, businesses, and researchers interested in creating autonomous agents. It enables users to build agents for open-ended tasks, automate workflows, ensure safe tool usage, deploy locally or hosted, and integrate with various services through secure connections.
Flue caters to a diverse audience, including developers seeking to innovate with AI, businesses automating repetitive tasks, and researchers exploring autonomous systems. Here’s how Flue serves these users:
Flue allows users to create agents similar to Claude or Codex that can navigate and complete open-ended tasks without continuous human oversight. This capability is particularly beneficial in environments requiring adaptive responses, such as customer service chatbots or automated data analysis.
With Flue, users can design automated workflows that manage complex sequences of tasks. For instance, a marketing team can create a campaign management agent that handles everything from email outreach to analytics reporting, streamlining operations and reducing manual effort.
Flue ensures that agents operate within a secure sandbox, protecting your systems from unintended actions. This feature is critical for businesses that need to implement AI-driven solutions without exposing sensitive data or risking system integrity.
Flue supports both local and hosted deployments. During development, users can run agents from the command line interface (CLI), which simplifies the debugging process. Once stable, agents can be deployed to a hosted runtime for scalability and ease of access.
Flue allows seamless integration with authenticated services through Managed Connection Protocol (MCP) servers. This enables agents to interact with various APIs securely, enhancing functionality and expanding use cases, such as integrating with CRM systems or third-party applications.
Flue is completely free to use, providing an accessible platform for users to manage their projects without any costs associated with its features. This enables teams to collaborate efficiently without the burden of subscription fees or hidden charges.
Flue is a project management tool that stands out due to its free usage model. This enables users, whether individuals or teams, to streamline their workflows without worrying about subscription fees. Flue provides essential features such as task management, real-time collaboration, and document sharing—all at no charge.
For example, small businesses or startups with limited budgets can utilize Flue to coordinate their projects effectively. Users can create tasks, assign them to team members, set deadlines, and track progress without incurring any costs. This makes Flue particularly attractive to organizations looking to maximize productivity while minimizing expenses.
Additionally, Flue's user-friendly interface ensures that even those unfamiliar with project management tools can navigate the platform seamlessly. The absence of a pricing model allows users to focus on their projects rather than financial constraints.
To get started with Flue, visit Flue's GitHub page to sign up and explore its features. Flue is an innovative framework designed to enhance your web development experience by integrating seamlessly with existing tools and workflows.
Flue is a modern web framework aimed at simplifying the development process. Here’s how to get started:
Visit the GitHub Repository: Go to Flue's GitHub page. This page contains all the necessary information, including installation guides, documentation, and community resources.
Create a GitHub Account: If you don’t already have one, create a GitHub account. This will allow you to download Flue, contribute to its development, and interact with the community.
Installation: After signing up, follow the instructions provided in the repository to install Flue. Typically, you will need to clone the repository using Git. Use the command:
git clone https://github.com/withastro/flue.git
Then, navigate to the directory and install dependencies using:
npm install
Explore Documentation: Familiarize yourself with the official documentation, which covers setup, usage examples, and best practices. This is crucial for leveraging Flue’s capabilities effectively.
Engage with the Community: Join forums, chat groups, or social media channels dedicated to Flue. This is an excellent way to get help, share experiences, and learn from others.
Browse by use case: Automation & Productivity
Compare flue: vs nodeterm · vs A.I.G (AI Infra Guard) · vs Trama · vs Agents Never Sleep