> ## Documentation Index
> Fetch the complete documentation index at: https://docs.webrayn.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Environment Variables

> All configuration knobs.

# 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**.