feat: support fallback_models list for multi-provider cascade - #3815
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feat: support fallback_models list for multi-provider cascade#3815zero-agent wants to merge 1 commit into
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Add support for a `fallback_models` list in config.yaml so multiple
backup providers are tried in order when earlier ones fail:
fallback_models:
- provider: openai-codex
model: gpt-5.4
- provider: custom
model: local-model
base_url: http://localhost:8080/v1
When the primary fails after retries, the agent tries each fallback in
sequence. If the first fallback also fails (e.g. rate-limited), it
cascades to the next until all are exhausted.
Backward compatible: existing single `fallback_model` config still works.
Author
|
Closing — superseded by #3813 which was merged with the same feature (ordered fallback provider chain). Our implementation overlapped. |
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Adds
fallback_models(list) config support so multiple backup providers are tried in order when earlier ones fail.Config:
Behavior: primary fails → try fallback 1 → if that also fails → try fallback 2 → … → give up.
Changes:
gateway/run.py:_load_fallback_model()readsfallback_modelslist, falls back to legacyfallback_modeldictrun_agent.py:_try_activate_fallback()cycles through chain instead of one-shottests/test_fallback_chain.py: 27 new testsBackward compatible — existing
fallback_modelconfig still works unchanged.