6eaae2ca4d
Gives the production runtime (lfx serve) the same v2 contract as the langflow backend's POST /api/v2/workflows, built on the shared lfx.workflow layer. - New POST /workflows endpoint: WorkflowRunRequest in, WorkflowExecutionResponse (sync) or an SSE stream (langflow/agui protocols) out. flow_id resolves against the serve registry; per-request deepcopy+stamp mirrors the run/stream endpoints. - sync runs via run_graph_internal (the same primitive the backend sync path uses) so the converter sees the aggregated RunOutputs shape. - stream drives the run with a token-stream EventManager wired into execute_graph_with_capture and feeds queue events through the shared StreamAdapter; emits a terminal end so the adapter closes the run cleanly. - background and public modes are rejected (422); tweaks/data/files/globals and partial-run boundaries are rejected too (no per-request graph rebuild yet). - execute_graph_with_capture gains an optional event_manager param. Tests build a real ChatInput->ChatOutput flow (no mocks) and exercise sync, both stream protocols, and the guards. 329 lfx serve + contract tests pass.
Langflow is a powerful platform for building and deploying AI-powered agents and workflows. It provides developers with both a visual authoring experience and built-in API and MCP servers that turn every workflow into a tool that can be integrated into applications built on any framework or stack. Langflow comes with batteries included and supports all major LLMs, vector databases and a growing library of AI tools.
✨ Highlight features
- Visual builder interface to quickly get started and iterate.
- Source code access lets you customize any component using Python.
- Interactive playground to immediately test and refine your flows with step-by-step control.
- Multi-agent orchestration with conversation management and retrieval.
- Deploy as an API or export as JSON for Python apps.
- Deploy as an MCP server and turn your flows into tools for MCP clients.
- Observability with LangSmith, LangFuse and other integrations.
- Enterprise-ready security and scalability.
🖥️ Langflow Desktop
Langflow Desktop is the easiest way to get started with Langflow. All dependencies are included, so you don't need to manage Python environments or install packages manually. Available for Windows and macOS.
⚡️ Quickstart
Install locally (recommended)
Requires Python 3.10–3.14 and uv (recommended package manager).
Install
From a fresh directory, run:
uv pip install langflow -U
The latest Langflow package is installed. For more information, see Install and run the Langflow OSS Python package.
Run
To start Langflow, run:
uv run langflow run
Langflow starts at http://127.0.0.1:7860.
That's it! You're ready to build with Langflow! 🎉
📦 Other install options
Run from source
If you've cloned this repository and want to contribute, run this command from the repository root:
make run_cli
For more information, see DEVELOPMENT.md.
Docker
Start a Langflow container with default settings:
docker run -p 7860:7860 langflowai/langflow:latest
Langflow is available at http://localhost:7860/. For configuration options, see the Docker deployment guide.
🛡️ Security
For security information, see our Security Policy.
🚀 Deployment
Langflow is completely open source and you can deploy it to all major deployment clouds. To learn how to deploy Langflow, see our Langflow deployment guides.
⭐ Stay up-to-date
Star Langflow on GitHub to be instantly notified of new releases.
👋 Contribute
We welcome contributions from developers of all levels. If you'd like to contribute, please check our contributing guidelines and help make Langflow more accessible.