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

# Slomo Environment Variables — SLOMO_* Override Reference

> All SLOMO_* environment variables: what each one overrides in config.toml, how boolean values are parsed, and common one-off usage recipes.

Every environment variable **overrides** the corresponding `config.toml` setting for that run. They're the right tool for one-off toggles:

```bash theme={null}
SLOMO_ENABLED=0 python app.py            # this run: record nothing
SLOMO_AUTOTRACE=0 pytest                 # this run: hooks yes, auto-trace no
```

## Reference

| Variable             | Overrides                                                           | Default |
| -------------------- | ------------------------------------------------------------------- | ------- |
| `SLOMO_ENABLED`      | `[recording] enabled` — master switch; `0` makes `enable()` a no-op | `1`     |
| `SLOMO_AUTOTRACE`    | `[hooks.autotrace] enabled`                                         | `1`     |
| `SLOMO_HOOK_HTTP`    | `[hooks.http] enabled`                                              | `1`     |
| `SLOMO_HOOK_SQL`     | `[hooks.sql] enabled`                                               | `1`     |
| `SLOMO_HOOK_LOGGING` | `[hooks.logging] enabled`                                           | `1`     |
| `SLOMO_SNAPSHOTS`    | `[hooks.snapshots] enabled`                                         | `1`     |

## Boolean parsing

Falsy values (case-insensitive): `0`, `false`, `no`, `off`, and the empty string. Everything else — `1`, `true`, `yes`, `on` — is truthy.

```bash theme={null}
SLOMO_HOOK_LOGGING=off python app.py     # same as SLOMO_HOOK_LOGGING=0
```

An **unset** variable defers to `config.toml`; a **set** variable wins over it.

## Common recipes

```bash theme={null}
# Silence slomo completely in a benchmark run
SLOMO_ENABLED=0 python bench.py

# Keep crash capture but drop the function-call firehose
SLOMO_AUTOTRACE=0 python app.py

# Debug slomo's own SQL hook interaction by removing it from the picture
SLOMO_HOOK_SQL=0 python app.py
```

<Note>
  Settings without an environment variable (capture limits, redaction rules, retention, autotrace `include`/`exclude`, …) are file-only — see [config.toml](/configuration/config-toml).
</Note>