# Config Externalization Over Env Fallback

> Replace env-var-or-default reads with a validated config loaded at boot that fails fast on missing values.

Record: `algorithms:no-env-fallback`
Kind: algorithm
Canonical: https://banes-lab.com/ontology/algorithms#algorithms-no-env-fallback
Closure: https://banes-lab.com/json/records/algorithms/no-env-fallback/closure

Listed in [Algorithm contracts](https://banes-lab.com/api/records/algorithms.md), after [Least Privilege Over Broad Privilege](https://banes-lab.com/records/algorithms/no-broad-privilege.md) and before [Profile-First Over Unmeasured Optimization](https://banes-lab.com/records/algorithms/no-unmeasured-optimization.md).

## Domain

- [Architectural Rules](https://banes-lab.com/records/algorithms-domain/architectural-rules.md)

## Tier

- [leaf](https://banes-lab.com/records/vocabulary/domain-tier-leaf.md)

## Composes

- [Security Core](https://banes-lab.com/records/algorithms/security-core.md)
- [Resource Core](https://banes-lab.com/records/algorithms/resource-core.md)

## Math type

- [Logic](https://banes-lab.com/records/reasoning/math-type-logic.md)

## Linked from

- [Architectural Clusters](https://banes-lab.com/ontology/algorithms/algorithms-domain-architectural-clusters.md)
- [The mathematics](https://banes-lab.com/ontology/reasoning/the-mathematics.md)
- [Domain tiers](https://banes-lab.com/ontology/schema/the-vocabulary-domain-tier.md)