update

src/type.jl

@@ -245,7 +245,7 @@ mutable struct agentState                     # Mutable runtime state of an agen
     model::llmModel                           # LLM model to use
     tools::Vector{agentTool}                  # Available tools
 
-    # messages history includes userMessage, assistantMessage, toolResultMessage
+    # messages history includes userMessage, assistantMessage, toolResultMessage. NO system prompt
     messages::Vector{agentMessage}            
     
     pendingToolCalls::Vector{String}          # Tool call IDs waiting for results
@@ -568,7 +568,7 @@ yiemAgent(agentState(...), Channel(...), Channel(...), Channel(...), ..., ...)
 ```
 """
 function yiemAgent(
-  ; systemPrompt::String="",
+  ; systemPrompt::String="You are helpful assistant.",
     model=nothing,
     tools::Vector{agentTool}=agentTool[],
     messages::Vector{agentMessage}=agentMessage[],