fix: Use ]]> in inject when prompt is also selected

When both inject and prompt are selected, use the same reasoning tag
(]]) for consistency instead of <|thought|>

codai/models/templates.py

@@ -84,11 +84,23 @@ class AgenticTemplateManager:
             if k in self.model_name: return v
         return "openai" if "gpt" in self.model_name else "qwen"
 
-    def get_agent_system_prompt(self, base_prompt: str) -> str:
-        """Injects agentic instructions specific to the model's strengths."""
+    def get_agent_system_prompt(self, base_prompt: str, use_reasoning_tag: bool = False) -> str:
+        """Injects agentic instructions specific to the model's strengths.
+        
+        Args:
+            base_prompt: The base system prompt
+            use_reasoning_tag: If True, use the reasoning tag (</think>) for consistency with prompt seeding.
+                             If False, use the model's preferred thought tag (e.g., <|thought|>).
+        """
+        # Use reasoning tag for consistency with prompt seeding, or model's preferred tag
+        if use_reasoning_tag:
+            thought_tag = self.THOUGHT_TAGS.get(self.family_key, "</think>")
+        else:
+            thought_tag = self.config.get('thought_tag', 'Thought:')
+        
         agent_addon = (
             "\n\nCRITICAL: You are an agent with access to tools. "
-            f"Use the {self.config.get('thought_tag', 'Thought:')} tag to reason step-by-step "
+            f"Use the {thought_tag} tag to reason step-by-step "
             "before providing a tool call. If you have enough info, provide the final answer."
         )
         return f"{base_prompt}{agent_addon}"

coderai

@@ -1949,6 +1949,10 @@ async def chat_completions(request: ChatCompletionRequest, http_request: Request
     if "inject" in force_reasoning_args:
         from codai.models.templates import AgenticTemplateManager
         template_manager = AgenticTemplateManager(request.model)
+        
+        # Use reasoning tag (]]) when prompt is also selected for consistency
+        use_reasoning_tag = "prompt" in force_reasoning_args
+        
         # Get the current system prompt if exists
         system_content = None
         for msg in messages:
@@ -1957,9 +1961,9 @@ async def chat_completions(request: ChatCompletionRequest, http_request: Request
                 break
         if system_content:
             # Inject agentic instructions
-            system_content = template_manager.get_agent_system_prompt(system_content)
+            system_content = template_manager.get_agent_system_prompt(system_content, use_reasoning_tag=use_reasoning_tag)
         else:
-            system_content = template_manager.get_agent_system_prompt("You are a helpful assistant.")
+            system_content = template_manager.get_agent_system_prompt("You are a helpful assistant.", use_reasoning_tag=use_reasoning_tag)
         # Update or add system message
         system_found = False
         for i, msg in enumerate(messages):