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fix(agent): clear stale config context_length on model switch #22387

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fix(agent): clear stale config context_length on model switch #22387

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10 changes: 10 additions & 0 deletions run_agent.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2526,6 +2526,11 @@ def switch_model(self, new_model, new_provider, api_key='', base_url='', api_mod
old_model = self.model
old_provider = self.provider

# Clear the per-config context_length override so the new model's
# actual context window is resolved via get_model_context_length()
# instead of inheriting the stale value from the previous model.
self._config_context_length = None

# ── Swap core runtime fields ──
self.model = new_model
self.provider = new_provider
Expand Down Expand Up @@ -8093,6 +8098,11 @@ def _try_activate_fallback(self, reason: "FailoverReason | None" = None) -> bool
fb_api_mode = "bedrock_converse"

old_model = self.model

# Clear the per-config context_length override so the fallback
# model's actual context window is resolved instead of inheriting
# the stale value from the previous model. See #22387.
self._config_context_length = None
self.model = fb_model
self.provider = fb_provider
self.base_url = fb_base_url
Expand Down