Studio Code: detach remote-session by default and add attach subcommand#3347
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gcsecsey merged 3 commits intoMay 6, 2026
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…mand `studio code remote-session start` now daemonizes by default — pass `--no-detach` to keep running attached in the foreground. The new `attach` subcommand connects to a running daemon and streams its log file to stdout in the same human-readable format used by foreground mode; Ctrl-C detaches the terminal without stopping the daemon.
The child spawned by startDaemon parses its own argv. With `--detach` defaulting to true, the child was re-entering the daemon-spawn branch instead of running the bridge, so the PID file was never written and startup timed out. Append `--no-detach` to the spawn args so the child always runs in foreground mode.
gcsecsey
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May 5, 2026
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Thanks @epeicher for tackling this! 🙌 In my testing the updated commands are working well, and I could attach-detach to the same session multiple times as described. 👍
| command | output |
|---|---|
start |
 |
status |
 |
attach |
 |
| detaching |  |
status (after detaching) |
 |
stop |
 |
start --no-detach |
 |
gcsecsey
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May 5, 2026
…e-detatch-mode-by-default-and-allow-to-attach-to-an
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📊 Performance Test ResultsComparing 20fd75c vs trunk app-size
site-editor
site-startup
Results are median values from multiple test runs. Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff) |
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Related issues
How AI was used in this PR
Implementation written by Claude under direction. I reviewed the diff and verified behavior end-to-end against a live daemon (attach connects, formats logs, detaches on Ctrl-C without killing the daemon). Test design and edge cases (rotation, dead-PID, daemon-exit detection) were iterated on with the assistant.
Proposed Changes
studio code remote-session startdefault from foreground to detached. The new behavior is "background daemon" by default; pass--no-detachto keep running attached in the foreground (same code path as before).studio code remote-session attach: connects to a running daemon, replays a 16 KB tail of~/.studio/remote-session.log, then streams new entries in the same human-readable format used when running foreground. Errors with exit 1 if no daemon is running. Ctrl-C / SIGTERM detach the terminal without stopping the daemon. Recovers from log rotation (size shrinks → reset offset) and reports daemon exit when the PID stops being live.formatLogLineForStdout()fromremote-session/logger.tsso attach can reuse the existing JSON-to-human formatter and stay consistent with foreground output.Testing Instructions
CLI:
npm run cli:buildSTUDIO_REMOTE_SESSION_ENABLED=1 node apps/cli/dist/cli/main.mjs code remote-session start— should printRemote-session daemon started (PID …)and return immediately.studio code remote-session status— confirms the daemon is running.studio code remote-session attach— should print the attach banner, replay the last bit of log, and stream new entries live. Press Ctrl-C: should printDetached. Daemon is still running.studio code remote-session status— daemon should still be running after detaching.studio code remote-session stop— terminates the daemon. Re-runningattachshould now error withRemote-session daemon is not running.studio code remote-session start --no-detach— should still run attached and print activity to stdout as before.Tests:
npm test -- apps/cli/remote-session/tests apps/cli/commands/ai/tests(150 passing)npm run typecheckPre-merge Checklist