---
summary: "How the mac app embeds the gateway WebChat and how to debug it"
read_when:
  - Debugging mac WebChat view or loopback port
title: "WebChat (macOS)"
---

The macOS menu bar app embeds the WebChat UI as a native SwiftUI view. It connects to the Gateway and defaults to the primary session for the selected agent (`main`, or `global` when `session.scope` is `global`), with a session switcher for other sessions.

- **Local mode**: connects directly to the local Gateway WebSocket.
- **Remote mode**: forwards the Gateway control port over SSH and uses that tunnel as the data plane.

## Launch and debugging

- Manual: Lobster menu -> "Open Chat".
- Auto-open for testing:

  ```bash
  dist/OpenClaw.app/Contents/MacOS/OpenClaw --chat
  ```

  (`--webchat` is accepted as a legacy alias.)

- Logs: `./scripts/clawlog.sh` (subsystem `ai.openclaw`, category `WebChatSwiftUI`).

## How it is wired

- Data plane: Gateway WS methods `chat.history`, `chat.send`, `chat.abort`, `chat.inject`, and events `chat`, `agent`, `presence`, `tick`, `health`.
- `chat.history` returns a display-normalized transcript: inline directive tags are stripped from visible text, plain-text tool-call XML payloads (`<tool_call>`, `<function_call>`, `<tool_calls>`, `<function_calls>`, including truncated blocks) and leaked model control tokens are stripped, pure silent-token assistant rows such as exact `NO_REPLY`/`no_reply` are omitted, and oversized rows can be replaced with a truncated placeholder.
- Session: defaults to the primary session as above; the UI can switch between sessions.
- Onboarding uses a dedicated session to keep first-run setup separate.
- Offline cache: the app keeps a small read-only cache of recent chat sessions and transcripts per gateway (`~/Library/Application Support/OpenClaw/chat-cache.sqlite`): cold opens paint the last known transcript immediately and refresh once the Gateway responds, and recent chats stay browsable while disconnected (sending stays disabled until the connection is back).

## Security surface

- Remote mode forwards only the Gateway WebSocket control port over SSH.

## Known limitations

- The UI is optimized for chat sessions, not a full browser sandbox.

## Related

- [WebChat](/web/webchat)
- [macOS app](/platforms/macos)