ONESHOT_GTM_TELEMETRY=0. Telemetry summarizes invocations with fields such as command, outcome, duration, version and OS.
The GTM repository’s TELEMETRY.md is the authoritative payload and privacy spec. Paid research, model and sending calls still send their providers the data they need; turning off telemetry does not disable those actions.
Local event log
The local event log records what GTM did, separately from telemetry. Each workspace writesevents.jsonl in its data directory. It stays on when telemetry is off.
For the default workspace:
tail -F for a long-running watch. See Watching what’s happening for filtering recipes and rotation details.