Open SWE - An Open-Source Asynchronous Coding Agent

Open SWE is an open-source cloud-based asynchronous coding agent built with LangGraph. It autonomously understands codebases, plans solutions, and executes code changes across entire repositories—from initial planning to opening pull requests.

Note: you're required to set your own LLM API keys to use the demo.

Note

💬 Read the announcement blog post here

Features

• 🔗 Trigger from Linear, Slack, or GitHub — mention @openswe in a Linear comment, Slack thread, or GitHub PR comment to kick off a task
• 👀 Instant acknowledgement — reacts with 👀 the moment it picks up your message so you know it's on it
• 💬 Message it while it's running — send follow-up messages mid-task and it'll pick them up before its next step
• 🔀 Run multiple tasks in parallel — each task runs in its own isolated cloud sandbox, no queuing
• 🔐 GitHub OAuth built-in — authenticates with your GitHub account automatically, no token setup needed
• 🚀 Opens PRs automatically — commits changes and opens a draft PR when done, linked back to your Linear ticket

Installation

Prerequisites

• Python 3.11+
• uv package manager
• LangGraph CLI
• ngrok (for exposing local webhooks)

1. Clone the repo

git clone https://github.com/langchain-ai/open-swe.git
cd open-swe/apps/agent

2. Install dependencies

uv sync

3. Set environment variables

Create a .env file in apps/agent/ with the following:

# LangSmith
LANGSMITH_API_KEY_PROD=""           # Your LangSmith API key
LANGSMITH_ENDPOINT="https://api.smith.langchain.com"
LANGSMITH_HOST_API_URL="https://api.host.langchain.com"
LANGCHAIN_TRACING_V2="true"
LANGCHAIN_PROJECT=""

# LLM
ANTHROPIC_API_KEY=""                # Anthropic API key (recommended default provider)

# GitHub OAuth (via LangSmith agent auth)
GITHUB_OAUTH_PROVIDER_ID=""         # GitHub OAuth provider ID from LangSmith
X_SERVICE_AUTH_JWT_SECRET=""        # Secret for service JWT tokens

# GitHub App (Bot)
GITHUB_APP_ID=""                    # GitHub App ID
GITHUB_APP_PRIVATE_KEY="-----BEGIN RSA PRIVATE KEY-----
...
-----END RSA PRIVATE KEY-----
"
GITHUB_APP_INSTALLATION_ID=""       # GitHub App installation ID

# GitHub Webhook
GITHUB_WEBHOOK_SECRET=""            # Secret for verifying GitHub webhooks

# Linear
LINEAR_API_KEY=""                   # Linear API key
LINEAR_WEBHOOK_SECRET=""            # Secret for verifying Linear webhooks

# Slack (optional)
SLACK_BOT_TOKEN=""
SLACK_BOT_USER_ID=""
SLACK_BOT_USERNAME=""
SLACK_SIGNING_SECRET=""

# Sandbox
DEFAULT_SANDBOX_TEMPLATE_NAME=""    # LangSmith sandbox template name (uses default if not set)

# Token encryption
TOKEN_ENCRYPTION_KEY=""             # 32-byte url-safe base64 key for encrypting GitHub tokens

4. Run the agent

In one terminal, start the LangGraph dev server:

uv run langgraph dev 

In a second terminal, start the webhook server:

make run

5. Expose webhooks with ngrok

In a third terminal, expose the webhook server so Linear/GitHub/Slack can reach it:

ngrok http 8000

Use the ngrok HTTPS URL as your webhook endpoint when configuring Linear, GitHub, and Slack integrations (e.g. https://xxxx.ngrok.io/webhooks/linear).

The LangGraph server runs on http://localhost:2024 and the webhook server on http://localhost:8000.

---

Setting up the Linear Webhook

1. Get your webhook URL

Start ngrok and copy the HTTPS URL:

ngrok http 8000
# e.g. https://xxxx.ngrok.io

Your Linear webhook URL will be: https://xxxx.ngrok.io/webhooks/linear

2. Create the webhook in Linear

1. Go to Linear → Settings → API → Webhooks
2. Click New webhook
3. Fill in the form:
   • Label: open-swe
   • URL: https://xxxx.ngrok.io/webhooks/linear
   • Secret: generate a random string and copy it — this goes in LINEAR_WEBHOOK_SECRET in your .env
4. Under Data change events, enable:
   • Comments → Create
5. Click Create webhook

3. Set the Linear API key

Open SWE uses LINEAR_API_KEY to fetch full issue details (description, project, team) and to post comments back. To get it:

1. Go to Linear → Settings → API → Personal API keys
2. Click New API key, name it open-swe
3. Copy the key into LINEAR_API_KEY in your .env

4. Verify it works

Comment @openswe on any Linear issue. You should see:

• A 👀 reaction appear on your comment within a few seconds
• A new run appear in your LangSmith project

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Usage

Open SWE can be used in multiple ways:

• 📋 From Linear. Mention @openswe in a comment on any Linear issue and describe the task you want it to perform (e.g. @openswe fix the login bug described above). The agent will pick up the issue context along with your instructions and start working on it.
• 🐙 GitHub (for Open SWE-generated PRs). Once Open SWE completes implementation, it pushes changes to a branch open-swe/<thread-id> and opens a draft pull request linking back to the originating Linear issue. From there, you can review the code, request changes, and merge when ready.