Feature Flags

All gateway features are on by default. Set any flag to false to disable it without deploying new code.

Available flags

Environment Variable	Default	Controls
`ENABLE_GUARDRAILS`	`true`	PII detection, prompt injection scanning
`ENABLE_RESPONSE_CACHE`	`true`	Response caching for deterministic requests
`ENABLE_COMPLIANCE_FILTER`	`true`	Early ZDR/no-train validation (routing enforcement stays on)
`ENABLE_PROMPT_CACHING`	`true`	Auto `cache_control` injection for Anthropic
`ENABLE_ROUTING_TRACE`	`true`	`X-Tangle-Routing-Trace` response header

Set in your environment:

ENABLE_GUARDRAILS=false    # Disable all guardrail scanning
ENABLE_RESPONSE_CACHE=false # Disable response cache reads/writes

ENABLE_COMPLIANCE_FILTER only disables the early validation check that returns a 400 before routing. The actual ZDR/no-train enforcement in the routing tiers (skip operators, skip LiteLLM) stays active regardless. This flag is for suppressing the early error, not for bypassing compliance.
When ENABLE_GUARDRAILS=false, no PII or injection scanning occurs. The X-Tangle-Guardrails header is never set. GuardrailEvent records are not created.
When ENABLE_RESPONSE_CACHE=false, every request hits the provider. Cached entries are not read or written. Existing cache entries are not purged (they expire naturally via TTL).