Where state lives, and how to back it up

Agents: claude, codex, opencode · On: desktop

Everything VCode remembers is plain files under one directory, VCODE_STATE. Copy it to back up; delete it to start clean. There is no database.

Why you would use it

You are moving VCode to another machine, want a backup before an upgrade, or want the disk space back from a year of transcripts.

How to use it

Find the root. Under the unit it is ~/.local/state/v-code/workbench/threads (the workbench/ directory keeps its name from before the rename); for a bare node server.js it is ~/.v-code/threads. The startup line names it: state <path>.
Back up: tar czf v-code-state.tgz -C ~/.local/state/v-code/workbench threads. Stopping the unit first gives a clean snapshot, but the logs are append-only, so a copy taken while it runs loses at most a torn trailing line.
Restore: stop the unit, unpack in place, start it.
Start clean: stop the unit, rm -rf the directory, start it. VCode recreates it empty.
Delete one thread instead: close the tab, then delete it from the UI. That is a recursive remove of the thread's own directory.

What you see

<VCODE_STATE>/
  settings.json              the cog's settings
  system-prompt.md           your system prompt, added after VCode's own (0600)
  settings-sync.json         what the account's settings copy last held (0600)
  tab-order.json             the tab strip's order
  projects.json              the projects: name, folders, last agent (0600)
  vapid.json                 push keys (0600)
  push-subscriptions.json    subscribed devices (0600)
  <thread-id>/
    events.ndjson            the canonical event log, one JSON object per line
    raw.ndjson               verbatim vendor frames
    raw.1.ndjson             the previous raw file, after a rotation
    attachments/             files uploaded into that thread
    system-prompt.md         an opencode thread's prompt, rewritten at each start (0600)

The thread directory name is the thread id put through encodeURIComponent.

Options and settings

Option	Default	What it changes
`VCODE_STATE`	`~/.v-code/threads`; `$STATE_DIR/workbench/threads` in the unit	The root of everything above
`--state-dir DIR` (install.sh)	`~/.local/state/v-code`	The `$STATE_DIR` the unit's paths are built from
Memory tail	2000 events per thread	How many events stay resident; older ones are re-read from the file
Raw rotation	25 MB	When `raw.ndjson` becomes `raw.1.ndjson`. Two files are kept

Limits and known gaps

Never rotate vapid.json. Every installed device's push subscription is bound to that keypair. Losing it means every device has to subscribe again. Back it up with the rest.
Deleting a thread is a hard delete: the whole directory, attachments included, goes. The route answers 409 unless the thread is closed first.
Nothing here is encrypted. The transcripts hold whatever your agents read and wrote, and the attachments hold whatever you uploaded. vapid.json and push-subscriptions.json, system-prompt.md (both the root's and a thread's), settings-sync.json and projects.json are written 0600; the rest takes the umask.
A torn trailing write (power loss, kill -9) is survivable: everything after the first unparseable line is discarded on read, so the log never poisons a boot.
raw.ndjson is a re-derivation source, not a replay source. Once it has rotated twice, the oldest raw frames are gone. events.ndjson is never truncated.
Moving the state root between machines carries the threads, but not the vendor sessions they resume from (~/.claude/projects, ~/.codex/sessions).