ConfigKeys

Canonical environment-variable names bound by llm4s-core's reference.conf.

Each is read through a ${?VAR} substitution under the llm4s config tree, so the config key it feeds can also be set directly in application.conf or as a JVM system property. This object centralises the names to avoid typos and make grep-friendly references possible.

== Quick reference ==

• Chat providers: a named section under llm4s.providers sets no key of its own by default; it uses its vendor's llm4s.credentials.<id>.apiKey, which the provider's module binds to the vendor's variable (llm4s-openai binds OPENAI_API_KEY, see OpenAIConfigKeys). Nothing reads LLM_MODEL.
• TRACING_MODE — optional; console (default) or none, or a backend module's mode: langfuse (llm4s-observability), opentelemetry (llm4s-observability-otel).
• EMBEDDING_MODEL — required when using embeddings; format provider/model.