Environment Variables

Variable	Description	Default
`CDP_URL`	CDP endpoint to attach to	`http://127.0.0.1:9222`
`WEBRAIN_CHROME`	Explicit Chrome binary path	auto-discovered
`WEBRAIN_BROWSERS_DIR`	Engine cache dir (Chrome for Testing, Obscura)	`%LOCALAPPDATA%\webrain\browsers` / `~/.cache/webrain/browsers`
`WEBRAIN_LIGHTPANDA` / `WEBRAIN_OBSCURA`	Explicit lightpanda/obscura binary paths	auto-discovered
`WEBRAIN_PROFILES_DIR`	Per-account browser profile root	`%APPDATA%\webrain\profiles` / `~/.config/webrain/profiles`
`WEBRAIN_VAULT_DIR`	Encrypted credential vault dir	`%APPDATA%\webrain` / `~/.config/webrain`
`WEBRAIN_USER` / `WEBRAIN_PASS`	Login fallback credentials (env channel)	—
`EMBED_URL`	`/embeddings` endpoint for `webrain_vision_index`	—
`RUST_LOG`	Log verbosity (`webrain=info,tungstenite=warn`)	as above

Discovery order

Binaries are discovered automatically on every OS: env override → PATH → ~/.lightpanda, ~/.obscura, ~/.local/bin → the webrain engine cache.