Environment Variables¶

On-demand reference for the SYNTHORG_* environment variables the backend reads. The precedence rule that governs mutable settings is in configuration-precedence.md; the short version is DB > env > default. Variables in this page fall into three categories:

Init-time only: read once at process start; no registry entry. Operator changes require a process restart. Used for credentials and bootstrap-only paths where a runtime registry entry would be unsafe.
Init-time, registry for discoverability: read once at boot but also exposed in the /settings UI through a read_only_post_init registry entry so operators can introspect the running value. SettingsService.set() rejects mutation with SettingReadOnlyError.
Runtime override: SYNTHORG_<NAMESPACE>_<KEY> derived from the registry definition; consulted on every resolve through SettingsService.get(). These are the standard mutable settings.

Persistence (init-time only)¶

Variable	Default	Purpose
`SYNTHORG_DATABASE_URL`	unset	Postgres connection URL. Format `postgresql://user:pass@host:port/db`. No query parameters allowed; use `SYNTHORG_POSTGRES_SSL_MODE` for ssl overrides.
`SYNTHORG_DB_PATH`	unset	SQLite database file path. Mutually exclusive with `SYNTHORG_DATABASE_URL` -- if both are set, Postgres wins. Consumed by `synthorg.api.app:create_app`.
`SYNTHORG_POSTGRES_SSL_MODE`	unset (driver default)	Optional override for the Postgres SSL mode (`disable` / `require` / `verify-ca` / `verify-full`). Validated at startup.

Bootstrap secrets (init-time only)¶

Variable	Default	Purpose
`SYNTHORG_JWT_SECRET`	unset	JWT signing secret. Required for multi-instance deployments so a token issued by one replica verifies on another. Consumed by `synthorg.api.auth.secret`.
`SYNTHORG_MASTER_KEY`	unset	Master key for the encrypted secret backends and integration credential storage. Consumed by `synthorg.persistence.secret_backends`.
`SYNTHORG_PAGINATION_CURSOR_SECRET`	unset	HMAC secret for paginated cursor signing. Falls back to a process-ephemeral secret (cursors invalidate on restart) when unset.

Filesystem (init-time, some with registry discoverability)¶

Variable	Default	Registry key	Purpose
`SYNTHORG_LOG_DIR`	unset	`observability/log_directory` (read-only)	Log output directory. Path-traversal rejected at boot.
`SYNTHORG_ARTIFACT_DIR`	`/data`	n/a	Filesystem artifact storage root. Must be absolute and free of `..` components.
`SYNTHORG_MEMORY_DIR`	tmp fallback	n/a	On-disk memory backend root for the local Mem0 backend.
`SYNTHORG_CONFIG_PATH`	`company.yaml`	n/a	Path to the company YAML config used by the backup factory.

Sandbox / fine-tune images (init-time only)¶

Variable	Default	Purpose
`SYNTHORG_SANDBOX_IMAGE`	`ghcr.io/aureliolo/synthorg-sandbox:latest`	Sandbox container image; CLI sets the digest-pinned variant after cosign verification.
`SYNTHORG_SIDECAR_IMAGE`	`ghcr.io/aureliolo/synthorg-sidecar:latest`	Sidecar (network-proxy) container image.
`SYNTHORG_FINE_TUNE_IMAGE`	unset	Override for the embedding fine-tune image (CLI publishes `-gpu` and `-cpu` variants).
`SYNTHORG_FINE_TUNE_HEALTH_PORT`	`15002`	Port the fine-tune container's health probe listens on.

Telemetry (runtime override)¶

Variable	Default	Registry key	Purpose
`SYNTHORG_TELEMETRY_ENABLED`	unset	`telemetry/enabled`	Master opt-in for product telemetry. Accepts `true` / `false` / `1` / `0` / `yes` / `no`.
`SYNTHORG_TELEMETRY_ENV`	unset	n/a	Operator override for the deployment environment tag (`prod` / `dev` / `pre-release` / custom). Wins over CI auto-detection and the Dockerfile-baked default.
`SYNTHORG_TELEMETRY_ENV_BAKED`	(image-baked)	n/a	Dockerfile-baked deployment environment. CI sets this in published images; operators normally don't touch it.

Tracing (init-time only)¶

Variable	Default	Purpose
`SYNTHORG_TRACE_OTLP_ENDPOINT`	unset	OTLP collector endpoint for distributed traces. When unset the OTLP exporter is not wired.
`SYNTHORG_TRACE_SERVICE_NAME`	`synthorg`	Service name attached to spans.
`SYNTHORG_TRACE_SAMPLING_RATIO`	`1.0`	Probabilistic span sampler ratio (0.0–1.0).

NATS (init-time, registry for discoverability)¶

Variable	Default	Registry key	Purpose
`SYNTHORG_NATS_URL`	`nats://nats:4222`	`communication/nats_url` (read-only)	NATS server URL. Bus driver opens its connection once at boot.
`SYNTHORG_DEFAULT_NATS_URL`	unset	n/a	Compose-template default that flows into `communication.nats.url` when no operator value is set.

Logging (mutable runtime override)¶

Variable	Default	Registry key	Purpose
`SYNTHORG_LOG_LEVEL`	unset	`observability/log_level_console` (mutable)	Override the console sink's log level distinct from the root logger. Standard Cat-1 chain (`DB > env > default`). Applied at boot via `_apply_console_level_override`; runtime mutation through the registry takes effect on the next subscriber-driven rebuild.

Workers (init-time, registry for discoverability)¶

Variable	Default	Registry key	Purpose
`SYNTHORG_WORKERS`	`1`	`workers/count` (read-only)	Uvicorn worker process count.

Generic registry override¶

For every mutable setting registered in src/synthorg/settings/definitions/, the env-var override is auto-derived as:

SYNTHORG_<NAMESPACE>_<KEY>

where the namespace and key are the registry tuple (uppercased, underscore-joined). A handful of settings carry a custom env_var_override that supersedes the auto-derived name (see the table at configuration-precedence.md § "Custom env var names"); for those entries, only the override name is consulted. Examples of the auto-derived shape:

Registry key	Auto-derived env var
`api/sse_keepalive_seconds`	`SYNTHORG_API_SSE_KEEPALIVE_SECONDS`
`engine/evolution_enabled`	`SYNTHORG_ENGINE_EVOLUTION_ENABLED`
`coordination/department_policy_cas_retry_attempts`	`SYNTHORG_COORDINATION_DEPARTMENT_POLICY_CAS_RETRY_ATTEMPTS`

The override sits below the DB and above the registered default in the precedence chain (see configuration-precedence.md). For a complete inventory of registered settings see the schema endpoint GET /api/v1/settings/schema or the src/synthorg/settings/definitions/ directory.

Adding a new env var¶

If the variable maps to a mutable setting: register a SettingDefinition and the auto-derived env var is wired automatically. No change to this page is required.
If the variable is init-time only (credentials / bootstrap): add a row to one of the sections above and consume the value with os.environ.get at the relevant boot site. Document the consumer module path in the row.
If the variable should be discoverable but read-only: register with restart_required=True and read_only_post_init=True, link the registry key in this page, and consume via os.environ.get at the boot site (the registry entry just exposes the value to the /settings UI).