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agent.py

@@ -403,6 +403,10 @@ def build_instructions(info: dict, spoken_language: str, domain: str = "general"
     else:
         fillers = "natural local conversational pause markers"
 
+    code_switch_rule = ""
+    if info.get("voice_id") in ["sw-KE-RafikiNeural", "sw-TZ-RehemaNeural"] and spoken_language != "english":
+        code_switch_rule = "\n- Must mix natural local Swahili/Sheng phrases with English in the first 10 words."
+
     return f"""You are DUOL, Africa's most intelligent AI voice assistant.
 Role: Deliver an emotionally intelligent, voice-optimized, real-time conversational agent capable of sub-500ms multi-lingual interaction.
 Language Context: {lang_prompt}
@@ -435,7 +439,7 @@ Guardrails (MUST AVOID):
 Guardrails (MUST INCLUDE):
 - Always introduce and identify yourself ONLY as DUOL.
 - Native conversational markers {fillers}.
-- Proactive disclaimers for health, finance, and legal queries.
+- Proactive disclaimers for health, finance, and legal queries.{code_switch_rule}
 
 Domain Focus:
 {domain_txt}