diff --git a/src/YiemAgent.jl b/src/YiemAgent.jl
index e021f3c..764574c 100644
--- a/src/YiemAgent.jl
+++ b/src/YiemAgent.jl
@@ -13,8 +13,8 @@ module YiemAgent
   include("utils.jl")
   using .utils
 
-  include("llmfunction.jl")
-  using .llmfunction
+  # include("llmfunction.jl")
+  # using .llmfunction
 
   include("agentCore.jl")
   using .agentCore
diff --git a/src/agentCore.jl b/src/agentCore.jl
index 7031295..6b96c57 100644
--- a/src/agentCore.jl
+++ b/src/agentCore.jl
@@ -3,7 +3,7 @@ module agentCore
 export _agent_loop, OpenAiToUserMessage
 
 using JSON, DataStructures, Dates, UUIDs, HTTP, Random, PrettyPrinting, Serialization,
-      DataFrames, Serde
+      DataFrames, Serde, Base.Threads
 using GeneralUtils
 using ..type, ..utils, ..llmfunction
 
@@ -34,41 +34,41 @@ julia> # Called automatically by yiemAgent constructor
 """
 function _agent_loop(agent::yiemAgent)
   try
-    processing_task = nothing
+    processingTask = nothing
 
     """ cases:
     1) agent -> idle, user msg -> nothing
-      typeof(processing_task) == Nothing
+      typeof(processingTask) == Nothing
       agent._state.activeRun -> false
       agent.inputChannel -> nothing
       agent.followUpChannel -> nothing
     
     2) agent -> idle, user msg -> new msg
-      typeof(processing_task) == Nothing
+      typeof(processingTask) == Nothing
       agent._state.activeRun -> false
       agent.inputChannel -> new msg
       agent.followUpChannel -> nothing
 
     3) agent -> running, user msg -> nothing
-      typeof(processing_task) == Task, istaskdone(processing_task) -> false
+      typeof(processingTask) == Task, istaskdone(processingTask) -> false
       agent._state.activeRun -> true
       agent.inputChannel -> nothing
       agent.followUpChannel -> nothing
     
     4) agent -> running, user msg -> new msg
-      typeof(processing_task) == Task, istaskdone(processing_task) -> false
+      typeof(processingTask) == Task, istaskdone(processingTask) -> false
       agent._state.activeRun -> true
       agent.inputChannel -> new msg
       agent.followUpChannel -> nothing
 
     5) agent -> running, user msg -> nothing, user msg follow up -> new msg
-      typeof(processing_task) == Task, istaskdone(processing_task) -> false
+      typeof(processingTask) == Task, istaskdone(processingTask) -> false
       agent._state.activeRun -> true
       agent.inputChannel -> nothing
       agent.followUpChannel -> new msg
 
     6) agent -> idle, user msg -> nothing
-      typeof(processing_task) == Task, istaskdone(processing_task) -> true
+      typeof(processingTask) == Task, istaskdone(processingTask) -> true
       agent._state.activeRun -> false
       agent.inputChannel -> nothing
       agent.followUpChannel -> nothing
@@ -108,12 +108,12 @@ function _agent_loop(agent::yiemAgent)
       # start _process_message loop
       if agent._state.activeRun == false
         # Dispatch message through the processing pipeline
-        processing_task = @spawn _process_message(agent)
+        processingTask = Threads.@spawn _process_message(agent)
         agent._state.activeRun = true
       end
 
       # during agent runs, check followUp message after _process_message() is done
-      if typeof(processing_task) == Task && istaskdone(processing_task) == false
+      if typeof(processingTask) == Task && istaskdone(processingTask) == false
         # if followUp message available, add them all to agent.inputChannel
         if isready(agent.followUpChannel)
           while isready(agent.followUpChannel)  
@@ -123,7 +123,7 @@ function _agent_loop(agent::yiemAgent)
         end
         continue  # continue to process user message in the next loop
 
-      elseif typeof(processing_task) == Task && istaskdone(processing_task) == true
+      elseif typeof(processingTask) == Task && istaskdone(processingTask) == true
         # if agent runs is done but followUpChannel has messages, discard all message in it.
         # when agent work is done it should not accept follow up msg.
         # user should put new message in inputChannel instead
@@ -132,10 +132,10 @@ function _agent_loop(agent::yiemAgent)
             _ = take!(agent.followUpChannel)
           end
         end
-        result = fetch(processing_task)
+        result = fetch(processingTask)
         put!(agent.outputChannel, result)
         agent._state.activeRun = false  # reset
-        processing_task = nothing       # reset
+        processingTask = nothing       # reset
       end
     end
   catch e
diff --git a/src/type.jl b/src/type.jl
index e659ca1..c803289 100644
--- a/src/type.jl
+++ b/src/type.jl
@@ -22,7 +22,6 @@ end
 struct llmModel                               # LLM model configuration
   id::String                                # Unique model identifier
   name::String                              # Human-readable model name
-  api::Api                                  # API type (parametric type)
   provider::String                          # Provider name (e.g., "anthropic", "openai")
   baseUrl::String                           # API endpoint base URL
   reasoning::Bool                           # Whether the model supports chain-of-thought