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feat: support comma-separated AI_MODEL for quick multi-model setup (#870)

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Users expected setting AI_MODEL to a comma-separated list to expose
multiple models in the picker, but the value was used verbatim as a
single model id, leaving the picker with only the "Server Default"
fallback.

Add a third-priority fallback in loadEnvServerModelsConfig: when
AI_MODELS_CONFIG and ai-models.json are both absent, AI_MODEL contains
a comma, and AI_PROVIDER is set to a known provider, synthesize an
equivalent ServerModelsConfig with the provider's models trimmed,
deduplicated, and the first marked as default.

Also makes getAIModel and getValidationModel pick the first comma-split
value when falling back to AI_MODEL, so requests started before the
client picker hydrates still resolve to a real model id.

Docs (en/cn/ja) and env.example updated; tests cover the new fallback
plus the no-comma / no-AI_PROVIDER negative cases.
This commit is contained in:
Dayuan Jiang
2026-06-15 14:27:55 +09:00
committed by GitHub
parent 0f9699843f
commit 8e42dd9da8
10 changed files with 140 additions and 12 deletions
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10
lib/ai-providers.ts
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@@ -729,8 +729,10 @@ export function getAIModel(overrides?: ClientOverrides): ModelConfig {
(overrides?.provider === "vertexai" && overrides?.vertexApiKey))
)
// Use client override if provided, otherwise fall back to env vars
const modelId = overrides?.modelId || process.env.AI_MODEL
// Use client override if provided, otherwise fall back to env vars.
// AI_MODEL may be comma-separated (multi-model fallback); pick the first.
const envModel = process.env.AI_MODEL?.split(",")[0]?.trim() || undefined
const modelId = overrides?.modelId || envModel
if (!modelId) {
if (isClientOverride) {
@@ -1490,7 +1492,9 @@ export function supportsImageInput(modelId: string): boolean {
* Throws if the model doesn't support image input.
*/
export function getValidationModel(): ReturnType<typeof getAIModel>["model"] {
const modelId = process.env.VALIDATION_MODEL || process.env.AI_MODEL
// AI_MODEL may be comma-separated (multi-model fallback); pick the first.
const envFallback = process.env.AI_MODEL?.split(",")[0]?.trim() || undefined
const modelId = process.env.VALIDATION_MODEL || envFallback
if (!modelId) {
throw new Error(