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fix(coder): provider-aware model fallback in subtask recovery #334

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Merged
OBenner merged 1 commit into from
Jun 12, 2026
Merged

fix(coder): provider-aware model fallback in subtask recovery #334

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28 changes: 10 additions & 18 deletions apps/backend/agents/coder.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@

from context.constants import SKIP_DIRS
from core.file_utils import write_json_atomic
from core.model_fallback import MODEL_FALLBACK_CHAIN
from core.model_fallback import get_fallback_model
from core.providers.base import SessionConfig
from core.providers.config import ProviderConfig
from core.providers.factory import create_engine_provider
Expand Down Expand Up @@ -1775,26 +1775,18 @@ def subagent_session_factory(

# Set model fallback if recommended
if recovery_action.use_model_fallback:
# Extract current model shorthand and get fallback
current_model_shorthand = "sonnet" # Default
if "opus" in phase_model.lower():
current_model_shorthand = "opus"
elif "sonnet" in phase_model.lower():
current_model_shorthand = "sonnet"
elif "haiku" in phase_model.lower():
current_model_shorthand = "haiku"

# Get fallback model from chain
fallback_chain = MODEL_FALLBACK_CHAIN.get(
current_model_shorthand, []
)
if fallback_chain:
override_model = fallback_chain[0] # Use first fallback
# Provider-aware lookup: the chain maps the ACTUAL
# current model (claude/openai/google/ollama) to its
# same-provider fallback. The old claude-shorthand
# guess defaulted any non-Claude model to "sonnet",
# which sent claude-haiku to direct providers and
# 404'd the whole build (live-build finding,
# 2026-06-12).
override_model = get_fallback_model(phase_model)
if override_model:
print_status(
f"Will try fallback model: {override_model}", "info"
)
else:
override_model = None

# Set recovery guidance from strategy
if recovery_action.strategy:
Expand Down
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