docs/user/telemetry.md

Anonymous usage data

The T3 server sends anonymous product events to PostHog. These events include the provider, model, reasoning effort, permission mode, turn result, duration, and normalized main-agent token totals when the provider reports them.

T3 Code does not send prompts, responses, file contents, raw provider events, thread IDs, turn IDs, provider instance IDs, authentication tokens, or child agent output. Token totals can be complete, partial, or unavailable. Child agent token use is not included.

Set T3CODE_TELEMETRY_ENABLED=false before you start the T3 server to stop product events from being recorded or sent. The server still derives an anonymous identifier during startup and can create its local fallback identifier file.