diff --git a/src/type.jl b/src/type.jl
index 99dbdfa..6cda17d 100644
--- a/src/type.jl
+++ b/src/type.jl
@@ -425,8 +425,8 @@ function yiemAgent(
     model=nothing,
     tools::Vector{agentTool}=agentTool[],
     messages::Vector{agentMessage}=agentMessage[],
-    formatMsgForLLM::Function=defaultformatMsgForLLM,
     preprocessContext::Union{Function, Nothing}=nothing,
+    formatMsgForLLM::Function=defaultformatMsgForLLM,
     beforeToolCall::Union{Function, Nothing}=nothing,
     afterToolCall::Union{Function, Nothing}=nothing,
     prepareNextTurn::Union{Function, Nothing}=nothing,
@@ -447,8 +447,8 @@ function yiemAgent(
     followUp,
     outputChannel,
     nothing,  # placeholder — replaced below
-    formatMsgForLLM,
     preprocessContext,
+    formatMsgForLLM,
     beforeToolCall,
     afterToolCall,
     prepareNextTurn,