update

src/type.jl

@@ -377,6 +377,8 @@ mutable struct yiemAgent <: agent             # High-level agent wrapper
   # Convert preprocessContext()'s new Vector{agentMessage} to LLM message format
   formatMsgForLLM::Function    
   
+  llmCall::Function                           # Actually invoke the LLM to get a completion response
+                                              
   # Callback invoked before executing a tool call (ask for user permission/confirmation/abort, etc..)
   beforeToolCall::Union{Function, Nothing}    
   
@@ -402,6 +404,7 @@ on `inputChannel` and `followUpChannel` channels concurrently.
 - `tools::Vector{agentTool}`: Available tools (default: empty)
 - `messages::Vector{agentMessage}`: Initial conversation messages (default: empty)
 - `formatMsgForLLM::Function`: Convert agent messages to LLM message format (default: `defaultformatMsgForLLM`)
+- `llmCall::Function`: Function to invoke the LLM (required)
 - `preprocessContext::Union{Function, Nothing}`: Preprocess/transform messages before sending to LLM (default: `nothing`)
 - `beforeToolCall::Union{Function, Nothing}`: Callback invoked before executing a tool call (default: `nothing`)
 - `afterToolCall::Union{Function, Nothing}`: Callback invoked after executing a tool call (default: `nothing`)
@@ -427,6 +430,7 @@ function yiemAgent(
     messages::Vector{agentMessage}=agentMessage[],
     preprocessContext::Union{Function, Nothing}=nothing,
     formatMsgForLLM::Function=defaultformatMsgForLLM,
+    llmCall::Function,
     beforeToolCall::Union{Function, Nothing}=nothing,
     afterToolCall::Union{Function, Nothing}=nothing,
     prepareNextTurn::Union{Function, Nothing}=nothing,
@@ -449,6 +453,7 @@ function yiemAgent(
     nothing,  # placeholder — replaced below
     preprocessContext,
     formatMsgForLLM,
+    llmCall,
     beforeToolCall,
     afterToolCall,
     prepareNextTurn,