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FAQ

General

What is HAPI?

HAPI is a local-first, self-hosted platform for running and controlling AI coding agents remotely (Claude Code, Codex, Cursor Agent, Grok Build, OpenCode, and more — see Supported Agents). It lets you start coding sessions on your computer and monitor/control them from your phone.

What does HAPI stand for?

HAPI (哈皮) is a Chinese transliteration of "Happy", reflecting the project's goal of making AI coding assistance a happier experience by freeing you from the terminal.

Is HAPI free?

Yes, HAPI is open source and free to use under the AGPL-3.0-only license.

What AI agents does HAPI support?

HAPI supports several coding agents, with Claude Code as the recommended option. See Supported Agents for the full list and per-agent setup notes.

Setup & Installation

Do I need a hub?

HAPI includes an embedded hub. Just run hapi hub on your machine - no external hub required.

hapi server remains supported as an alias.

How do I access HAPI from my phone?

For local network access:

http://<your-computer-ip>:3006

If your phone cannot connect, make sure the hub is not only listening on 127.0.0.1. For LAN access, set listenHost to 0.0.0.0 in ~/.hapi/settings.json or set HAPI_LISTEN_HOST=0.0.0.0, then restart hapi hub.

For internet access:

  • Use the built-in relay tunnel: start the hub with hapi hub --relay to get a public URL via the tunwg relay (defaults to the official relay.hapi.run)
  • If the hub has a public IP, access it directly (use HTTPS via reverse proxy for production)
  • If behind NAT, set up your own tunnel (Cloudflare Tunnel, Tailscale, or ngrok)

What's the access token for?

The CLI_API_TOKEN is a shared secret that authenticates:

  • CLI connections to the hub
  • Web app logins
  • Telegram account binding

It's auto-generated on first hub start and saved to ~/.hapi/settings.json.

Do you support multiple accounts?

Yes. We support lightweight multi-account access via namespaces for shared team hubs. See Namespace (Advanced).

Can I use HAPI without Telegram?

Yes. Telegram is optional. You can use the web app directly in any browser or install it as a PWA.

Usage

How do I approve permissions remotely?

  1. When your AI agent requests permission (e.g., to edit a file), you'll see a notification
  2. Open HAPI on your phone
  3. Navigate to the active session
  4. Approve or deny the pending permission

How do I receive notifications?

HAPI supports three methods:

  1. PWA Push Notifications - Enable when prompted, works even when app is closed
  2. Telegram Bot - See Telegram Setup
  3. FCM native push - Used by the Android/Wear OS companion apps; notifications are delivered via Firebase Cloud Messaging

Can I start sessions remotely?

Yes, with runner mode:

  1. Run hapi runner start on your computer
  2. Your machine appears in the "Machines" list in the web app
  3. Tap to spawn new sessions from anywhere

How do I see what files were changed?

In the session view, tap the "Files" tab to:

  • Browse project files
  • View git status
  • See diffs of changed files

Can I send messages to the AI from my phone?

Yes. Open any session and use the chat interface to send messages directly to the AI agent.

Why did my session look idle when the agent woke itself?

Some agents (especially Cursor) can resume after idle from harness signals such as background Shell notify_on_output or /loop, without you sending a new HAPI message. HAPI treats real ACP agent activity (and permission requests) as thinking again so the session list matches the agent - same keepalive path as a normal turn. This is different from session-attached jobs (hapi job), which show progress while the agent stays idle on purpose.

Can I access a terminal remotely?

Yes. Open a session in the web app and tap the Terminal tab for a remote shell.

Linux and macOS hosts use Bun's POSIX PTY support. Windows hosts use Bun's ConPTY support, which requires Bun 1.3.14 or newer.

How do I use voice control?

The voice assistant supports three backends: ElevenLabs, Gemini Live, and Qwen Realtime. Configure at least one, open a session in the web app, and click the microphone button. See Voice Assistant for setup details.

Security

Is my data safe?

Yes. HAPI is local-first:

  • All data stays on your machine
  • Nothing is uploaded to external servers
  • The database is stored locally in ~/.hapi/

How secure is the token authentication?

The auto-generated token is 256-bit (cryptographically secure). For external access, always use HTTPS via a tunnel.

Can others access my HAPI instance?

Only if they have your access token. For additional security:

  • Use a strong, unique token
  • Always use HTTPS for external access
  • Consider Tailscale for private networking

Troubleshooting

"Connection refused" error

  • Ensure hub is running: hapi hub
  • Check firewall allows port 3006
  • Verify HAPI_API_URL is correct

My phone cannot access HAPI on the local network

If HAPI works on your computer but not from another device on the same LAN, check the hub bind address first. By default, HAPI listens on 127.0.0.1, which only accepts localhost connections.

Use one of these:

{
  "listenHost": "0.0.0.0"
}
export HAPI_LISTEN_HOST=0.0.0.0

Then restart hapi hub and open:

http://<your-computer-ip>:3006

Also verify your OS firewall allows inbound connections on port 3006.

"Invalid token" error

Run hapi doctor first - it shows whether CLI_API_TOKEN is set and where it comes from (environment variable or settings file).

  • Re-run hapi auth login
  • Check token matches in CLI and hub
  • Verify ~/.hapi/settings.json has correct cliApiToken

Runner won't start

Run hapi doctor first - it shows runner status (including stale state), all hapi processes, and recent log files.

# Check status
hapi runner status

# List sessions the runner is aware of
hapi runner list

# Stop a specific runner-spawned session
hapi runner stop-session <session-id>

# Clear stale lock file
rm ~/.hapi/runner.state.json.lock

# Check logs
hapi runner logs

# Kill runaway hapi processes
hapi doctor clean

Claude Code not found

Install Claude Code or set custom path:

npm install -g @anthropic-ai/claude-code
# or
export HAPI_CLAUDE_PATH=/path/to/claude

Cursor Agent not found

Install Cursor Agent CLI:

# macOS/Linux
curl https://cursor.com/install -fsS | bash

# Windows (PowerShell)
irm 'https://cursor.com/install?win32=true' | iex

Ensure agent is on your PATH.

How do I run diagnostics?

hapi doctor

This is the first diagnostic step for most issues. It prints:

  • CLI version, platform, and spawn diagnostics
  • Configuration and relevant environment variables
  • Contents of settings.json (token redacted)
  • Whether CLI_API_TOKEN is set, and its source (it does not contact the hub or validate the token)
  • Runner status and runner state (including stale state)
  • All running hapi processes
  • Recent log files (including runner logs)

To clean up runaway processes:

hapi doctor clean

Comparison

HAPI vs Happy

Aspect Happy HAPI
Design Cloud-first Local-first
Users Multi-user Single user by default; lightweight multi-account isolation via namespaces
Deployment Multiple services Single binary
Data Encrypted on server Never leaves your machine

See Why HAPI for detailed comparison.

HAPI vs running Claude Code directly

Feature Claude Code HAPI + Claude Code
Remote access No Yes
Mobile control No Yes
Permission approval Terminal only Phone/web
Session persistence No Yes
Multi-machine Manual Built-in

Contributing

How can I contribute?

Visit our GitHub repository to:

  • Report issues
  • Submit pull requests
  • Suggest features

Where do I report bugs?

Open an issue on GitHub Issues.