The chat queue path is gone. The Chrome side panel is now just an
interactive claude PTY in xterm.js. Activity / Refs / Inspector still
exist behind the `debug` toggle in the footer.
Three threads of change, all from dogfood iteration on top of
cc-pty-import:
1. fix(server): cross-port WS auth via Sec-WebSocket-Protocol
- Browsers can't set Authorization on a WebSocket upgrade. We had
been minting an HttpOnly gstack_pty cookie via /pty-session, but
SameSite=Strict cookies don't survive the cross-port jump from
server.ts:34567 to the agent's random port from a chrome-extension
origin. The WS opened then immediately closed → "Session ended."
- /pty-session now also returns ptySessionToken in the JSON body.
- Extension calls `new WebSocket(url, [`gstack-pty.<token>`])`.
Browser sends Sec-WebSocket-Protocol on the upgrade.
- Agent reads the protocol header, validates against validTokens,
and MUST echo the protocol back (Chromium closes the connection
immediately if a server doesn't pick one of the offered protocols).
- Cookie path is kept as a fallback for non-browser callers (curl,
integration tests).
- New integration test exercises the full protocol-auth round-trip
via raw fetch+Upgrade so a future regression of this exact class
fails in CI.
2. fix(extension): UX polish on the Terminal pane
- Eager auto-connect when the sidebar opens — no "Press any key to
start" friction every reload.
- Always-visible ↻ Restart button in the terminal toolbar (not
gated on the ENDED state) so the user can force a fresh claude
mid-session.
- MutationObserver on #tab-terminal's class attribute drives a
fitAddon.fit() + term.refresh() when the pane becomes visible
again — xterm doesn't auto-redraw after display:none → display:flex.
3. feat(extension): rip the chat tab + sidebar-agent.ts
- Sidebar is Terminal-only. No more Terminal | Chat primary nav.
- sidebar-agent.ts deleted. /sidebar-command, /sidebar-chat,
/sidebar-agent/event, /sidebar-tabs* and friends all deleted.
- The pickSidebarModel router (sonnet vs opus) is gone — the live
PTY uses whatever model the user's `claude` CLI is configured with.
- Quick-actions (🧹 Cleanup / 📸 Screenshot / 🍪 Cookies) survive
in the Terminal toolbar. Cleanup now injects its prompt into the
live PTY via window.gstackInjectToTerminal — no more
/sidebar-command POST. The Inspector "Send to Code" action uses
the same injection path.
- clear-chat button removed from the footer.
- sidepanel.js shed ~900 lines of chat polling, optimistic UI,
stop-agent, etc.
Net diff: -3.4k lines across 16 files. CLAUDE.md, TODOS.md, and
docs/designs/SIDEBAR_MESSAGE_FLOW.md rewritten to match. The sidebar
regression test (browse/test/sidebar-tabs.test.ts) is rewritten as 27
structural assertions locking the new layout — Terminal sole pane,
no chat input, quick-actions in toolbar, eager-connect, MutationObserver
repaint, restart helper.
Translates phoenix gbrowser's Go PTY (cmd/gbd/terminal.go) into a Bun
non-compiled process. Lives separately from `sidebar-agent.ts` so a
WS-framing or PTY-cleanup bug can't take down the chat path (codex
outside-voice review caught the coupling risk).
Architecture:
- Bun.serve on 127.0.0.1:0 (never tunneled).
- POST /internal/grant accepts cookie tokens from the parent server over
loopback, authenticated with a per-boot internal token.
- GET /ws upgrades require BOTH (a) Origin: chrome-extension://<id> and
(b) the gstack_pty cookie minted by /pty-session. Either gate alone is
insufficient (CSWSH defense + auth defense).
- Lazy spawn: claude PTY is not started until the WS receives its first
data frame. Idle sidebar opens cost nothing.
- Bun PTY API: `terminal: { rows, cols, data(t, chunk) }` — verified at
impl time on Bun 1.3.10. proc.terminal.write() for input,
proc.terminal.resize() for resize, proc.kill() + 3s SIGKILL fallback
on close.
- process.on('uncaughtException'|'unhandledRejection') handlers so a
framing bug logs but doesn't kill the listener loop.
Test-only `BROWSE_TERMINAL_BINARY` env override lets the integration
tests spawn /bin/bash instead of requiring claude on every CI runner.
Not yet spawned by anything — wired in the next commit.
Garry Tan