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Source: https://docs.datzi.ai/help/environment

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Environment variables

Datzi pulls environment variables from multiple sources. The rule is never override existing values.

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Precedence (highest → lowest)

  1. Process environment (what the Gateway process already has from the parent shell/daemon).
  2. .env in the current working directory (dotenv default; does not override).
  3. Global .env at ~/.datzi/.env (aka $DATZI_STATE_DIR/.env; does not override).
  4. Config env block in ~/.datzi/datzi.json (applied only if missing).
  5. Optional login-shell import (env.shellEnv.enabled or DATZI_LOAD_SHELL_ENV=1), applied only for missing expected keys.
If the config file is missing entirely, step 4 is skipped; shell import still runs if enabled.

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Config env block

Two equivalent ways to set inline env vars (both are non-overriding): 
{
  env: {
    vars: {
      GROQ_API_KEY: 'gsk-...'
    }
  }
}

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Shell env import

env.shellEnv runs your login shell and imports only missing expected keys: 
{
  env: {
    shellEnv: {
      enabled: true,
      timeoutMs: 15000
    }
  }
}
Env var equivalents:
  • DATZI_LOAD_SHELL_ENV=1
  • DATZI_SHELL_ENV_TIMEOUT_MS=15000

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Env var substitution in config

You can reference env vars directly in config string values using ${VAR_NAME} syntax: 
{
  models: {
    providers: {
      'vercel-gateway': {
        apiKey: '${VERCEL_GATEWAY_API_KEY}'
      }
    }
  }
}
See Configuration: Env var substitution for full details.
VariablePurpose
DATZI_HOMEOverride the home directory used for all internal path resolution (~/.datzi/, agent dirs, sessions, credentials). Useful when running Datzi as a dedicated service user.
DATZI_STATE_DIROverride the state directory (default ~/.datzi).
DATZI_CONFIG_PATHOverride the config file path (default ~/.datzi/datzi.json).

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DATZI_HOME

When set, DATZI_HOME replaces the system home directory ($HOME / os.homedir()) for all internal path resolution. This enables full filesystem isolation for headless service accounts. Precedence: DATZI_HOME > $HOME > USERPROFILE > os.homedir() Example (macOS LaunchDaemon): 

<key>EnvironmentVariables</key>
<dict>
<key>DATZI_HOME</key>
<string>/Users/kira</string>
</dict>
DATZI_HOME can also be set to a tilde path (e.g. ~/svc), which gets expanded using $HOME before use.

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