diff --git a/Manifest.toml b/Manifest.toml
index a7fe20c..b741d46 100644
--- a/Manifest.toml
+++ b/Manifest.toml
@@ -20,6 +20,12 @@ uuid = "56f22d72-fd6d-98f1-02f0-08ddc0907c33"
 [[deps.Base64]]
 uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
 
+[[deps.CSV]]
+deps = ["CodecZlib", "Dates", "FilePathsBase", "InlineStrings", "Mmap", "Parsers", "PooledArrays", "PrecompileTools", "SentinelArrays", "Tables", "Unicode", "WeakRefStrings", "WorkerUtilities"]
+git-tree-sha1 = "6c834533dc1fabd820c1db03c839bf97e45a3fab"
+uuid = "336ed68f-0bac-5ca0-87d4-7b16caf5d00b"
+version = "0.10.14"
+
 [[deps.Calculus]]
 deps = ["LinearAlgebra"]
 git-tree-sha1 = "f641eb0a4f00c343bbc32346e1217b86f3ce9dad"
@@ -32,6 +38,12 @@ git-tree-sha1 = "c0216e792f518b39b22212127d4a84dc31e4e386"
 uuid = "da1fd8a2-8d9e-5ec2-8556-3022fb5608a2"
 version = "1.3.5"
 
+[[deps.CodecZlib]]
+deps = ["TranscodingStreams", "Zlib_jll"]
+git-tree-sha1 = "b8fe8546d52ca154ac556809e10c75e6e7430ac8"
+uuid = "944b1d66-785c-5afd-91f1-9de20f533193"
+version = "0.7.5"
+
 [[deps.Compat]]
 deps = ["TOML", "UUIDs"]
 git-tree-sha1 = "b1c55339b7c6c350ee89f2c1604299660525b248"
@@ -47,17 +59,33 @@ deps = ["Artifacts", "Libdl"]
 uuid = "e66e0078-7015-5450-92f7-15fbd957f2ae"
 version = "1.1.1+0"
 
+[[deps.Crayons]]
+git-tree-sha1 = "249fe38abf76d48563e2f4556bebd215aa317e15"
+uuid = "a8cc5b0e-0ffa-5ad4-8c14-923d3ee1735f"
+version = "4.1.1"
+
 [[deps.DataAPI]]
 git-tree-sha1 = "abe83f3a2f1b857aac70ef8b269080af17764bbe"
 uuid = "9a962f9c-6df0-11e9-0e5d-c546b8b5ee8a"
 version = "1.16.0"
 
+[[deps.DataFrames]]
+deps = ["Compat", "DataAPI", "DataStructures", "Future", "InlineStrings", "InvertedIndices", "IteratorInterfaceExtensions", "LinearAlgebra", "Markdown", "Missings", "PooledArrays", "PrecompileTools", "PrettyTables", "Printf", "REPL", "Random", "Reexport", "SentinelArrays", "SortingAlgorithms", "Statistics", "TableTraits", "Tables", "Unicode"]
+git-tree-sha1 = "04c738083f29f86e62c8afc341f0967d8717bdb8"
+uuid = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
+version = "1.6.1"
+
 [[deps.DataStructures]]
 deps = ["Compat", "InteractiveUtils", "OrderedCollections"]
 git-tree-sha1 = "1d0a14036acb104d9e89698bd408f63ab58cdc82"
 uuid = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
 version = "0.18.20"
 
+[[deps.DataValueInterfaces]]
+git-tree-sha1 = "bfc1187b79289637fa0ef6d4436ebdfe6905cbd6"
+uuid = "e2d170a0-9d28-54be-80f0-106bbe20a464"
+version = "1.0.0"
+
 [[deps.Dates]]
 deps = ["Printf"]
 uuid = "ade2ca70-3891-5945-98fb-dc099432e06a"
@@ -99,6 +127,12 @@ git-tree-sha1 = "5837a837389fccf076445fce071c8ddaea35a566"
 uuid = "fa6b7ba4-c1ee-5f82-b5fc-ecf0adba8f74"
 version = "0.6.8"
 
+[[deps.FilePathsBase]]
+deps = ["Compat", "Dates", "Mmap", "Printf", "Test", "UUIDs"]
+git-tree-sha1 = "9f00e42f8d99fdde64d40c8ea5d14269a2e2c1aa"
+uuid = "48062228-2e41-5def-b9a4-89aafe57970f"
+version = "0.9.21"
+
 [[deps.FileWatching]]
 uuid = "7b1f6079-737a-58dc-b8bc-7a2ca5c1b5ee"
 
@@ -114,8 +148,12 @@ weakdeps = ["PDMats", "SparseArrays", "Statistics"]
     FillArraysSparseArraysExt = "SparseArrays"
     FillArraysStatisticsExt = "Statistics"
 
+[[deps.Future]]
+deps = ["Random"]
+uuid = "9fa8497b-333b-5362-9e8d-4d0656e87820"
+
 [[deps.GeneralUtils]]
-deps = ["DataStructures", "Dates", "Distributions", "JSON3", "MQTTClient", "Random", "Revise", "UUIDs"]
+deps = ["CSV", "DataFrames", "DataStructures", "Dates", "Distributions", "JSON3", "MQTTClient", "Random", "Revise", "UUIDs"]
 path = "/appfolder/app/privatejuliapkg/GeneralUtils"
 uuid = "c6c72f09-b708-4ac8-ac7c-2084d70108fe"
 version = "0.1.0"
@@ -126,15 +164,37 @@ git-tree-sha1 = "f218fe3736ddf977e0e772bc9a586b2383da2685"
 uuid = "34004b35-14d8-5ef3-9330-4cdb6864b03a"
 version = "0.3.23"
 
+[[deps.InlineStrings]]
+deps = ["Parsers"]
+git-tree-sha1 = "86356004f30f8e737eff143d57d41bd580e437aa"
+uuid = "842dd82b-1e85-43dc-bf29-5d0ee9dffc48"
+version = "1.4.1"
+
+    [deps.InlineStrings.extensions]
+    ArrowTypesExt = "ArrowTypes"
+
+    [deps.InlineStrings.weakdeps]
+    ArrowTypes = "31f734f8-188a-4ce0-8406-c8a06bd891cd"
+
 [[deps.InteractiveUtils]]
 deps = ["Markdown"]
 uuid = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
 
+[[deps.InvertedIndices]]
+git-tree-sha1 = "0dc7b50b8d436461be01300fd8cd45aa0274b038"
+uuid = "41ab1584-1d38-5bbf-9106-f11c6c58b48f"
+version = "1.3.0"
+
 [[deps.IrrationalConstants]]
 git-tree-sha1 = "630b497eafcc20001bba38a4651b327dcfc491d2"
 uuid = "92d709cd-6900-40b7-9082-c6be49f344b6"
 version = "0.2.2"
 
+[[deps.IteratorInterfaceExtensions]]
+git-tree-sha1 = "a3f24677c21f5bbe9d2a714f95dcd58337fb2856"
+uuid = "82899510-4779-5014-852e-03e436cf321d"
+version = "1.0.0"
+
 [[deps.JLLWrappers]]
 deps = ["Artifacts", "Preferences"]
 git-tree-sha1 = "7e5d6779a1e09a36db2a7b6cff50942a0a7d0fca"
@@ -159,6 +219,11 @@ git-tree-sha1 = "a6adc2dcfe4187c40dc7c2c9d2128e326360e90a"
 uuid = "aa1ae85d-cabe-5617-a682-6adf51b2e16a"
 version = "0.9.32"
 
+[[deps.LaTeXStrings]]
+git-tree-sha1 = "50901ebc375ed41dbf8058da26f9de442febbbec"
+uuid = "b964fa9f-0449-5b57-a5c2-d3ea65f4040f"
+version = "1.3.1"
+
 [[deps.LibCURL]]
 deps = ["LibCURL_jll", "MozillaCACerts_jll"]
 uuid = "b27032c2-a3e7-50c8-80cd-2d36dbcbfd21"
@@ -295,6 +360,12 @@ deps = ["Artifacts", "Dates", "Downloads", "FileWatching", "LibGit2", "Libdl", "
 uuid = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 version = "1.10.0"
 
+[[deps.PooledArrays]]
+deps = ["DataAPI", "Future"]
+git-tree-sha1 = "36d8b4b899628fb92c2749eb488d884a926614d3"
+uuid = "2dfb63ee-cc39-5dd5-95bd-886bf059d720"
+version = "1.4.3"
+
 [[deps.PrecompileTools]]
 deps = ["Preferences"]
 git-tree-sha1 = "5aa36f7049a63a1528fe8f7c3f2113413ffd4e1f"
@@ -307,6 +378,12 @@ git-tree-sha1 = "9306f6085165d270f7e3db02af26a400d580f5c6"
 uuid = "21216c6a-2e73-6563-6e65-726566657250"
 version = "1.4.3"
 
+[[deps.PrettyTables]]
+deps = ["Crayons", "LaTeXStrings", "Markdown", "PrecompileTools", "Printf", "Reexport", "StringManipulation", "Tables"]
+git-tree-sha1 = "66b20dd35966a748321d3b2537c4584cf40387c7"
+uuid = "08abe8d2-0d0c-5749-adfa-8a2ac140af0d"
+version = "2.3.2"
+
 [[deps.Printf]]
 deps = ["Unicode"]
 uuid = "de0858da-6303-5e67-8744-51eddeeeb8d7"
@@ -363,6 +440,12 @@ version = "0.4.2+0"
 uuid = "ea8e919c-243c-51af-8825-aaa63cd721ce"
 version = "0.7.0"
 
+[[deps.SentinelArrays]]
+deps = ["Dates", "Random"]
+git-tree-sha1 = "ff11acffdb082493657550959d4feb4b6149e73a"
+uuid = "91c51154-3ec4-41a3-a24f-3f23e20d615c"
+version = "1.4.5"
+
 [[deps.Serialization]]
 uuid = "9e88b42a-f829-5b0c-bbe9-9e923198166b"
 
@@ -423,6 +506,12 @@ version = "1.3.1"
     ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
     InverseFunctions = "3587e190-3f89-42d0-90ee-14403ec27112"
 
+[[deps.StringManipulation]]
+deps = ["PrecompileTools"]
+git-tree-sha1 = "a04cabe79c5f01f4d723cc6704070ada0b9d46d5"
+uuid = "892a3eda-7b42-436c-8928-eab12a02cf0e"
+version = "0.3.4"
+
 [[deps.StructTypes]]
 deps = ["Dates", "UUIDs"]
 git-tree-sha1 = "ca4bccb03acf9faaf4137a9abc1881ed1841aa70"
@@ -443,11 +532,36 @@ deps = ["Dates"]
 uuid = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
 version = "1.0.3"
 
+[[deps.TableTraits]]
+deps = ["IteratorInterfaceExtensions"]
+git-tree-sha1 = "c06b2f539df1c6efa794486abfb6ed2022561a39"
+uuid = "3783bdb8-4a98-5b6b-af9a-565f29a5fe9c"
+version = "1.0.1"
+
+[[deps.Tables]]
+deps = ["DataAPI", "DataValueInterfaces", "IteratorInterfaceExtensions", "LinearAlgebra", "OrderedCollections", "TableTraits"]
+git-tree-sha1 = "cb76cf677714c095e535e3501ac7954732aeea2d"
+uuid = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
+version = "1.11.1"
+
 [[deps.Tar]]
 deps = ["ArgTools", "SHA"]
 uuid = "a4e569a6-e804-4fa4-b0f3-eef7a1d5b13e"
 version = "1.10.0"
 
+[[deps.Test]]
+deps = ["InteractiveUtils", "Logging", "Random", "Serialization"]
+uuid = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[[deps.TranscodingStreams]]
+git-tree-sha1 = "60df3f8126263c0d6b357b9a1017bb94f53e3582"
+uuid = "3bb67fe8-82b1-5028-8e26-92a6c54297fa"
+version = "0.11.0"
+weakdeps = ["Random", "Test"]
+
+    [deps.TranscodingStreams.extensions]
+    TestExt = ["Test", "Random"]
+
 [[deps.UUIDs]]
 deps = ["Random", "SHA"]
 uuid = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
@@ -455,6 +569,17 @@ uuid = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 [[deps.Unicode]]
 uuid = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
 
+[[deps.WeakRefStrings]]
+deps = ["DataAPI", "InlineStrings", "Parsers"]
+git-tree-sha1 = "b1be2855ed9ed8eac54e5caff2afcdb442d52c23"
+uuid = "ea10d353-3f73-51f8-a26c-33c1cb351aa5"
+version = "1.4.2"
+
+[[deps.WorkerUtilities]]
+git-tree-sha1 = "cd1659ba0d57b71a464a29e64dbc67cfe83d54e7"
+uuid = "76eceee3-57b5-4d4a-8e66-0e911cebbf60"
+version = "1.6.1"
+
 [[deps.Zlib_jll]]
 deps = ["Libdl"]
 uuid = "83775a58-1f1d-513f-b197-d71354ab007a"
diff --git a/src/interface.jl b/src/interface.jl
index d0d0ff2..c802b60 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -12,7 +12,7 @@ using ..type, ..mcts, ..util
 """ Search the best action to take for a given state and task 
 
 # Arguments
-  - `initial state`
+  - `initialstate::T`
     initial state
   - `transition::Function`
     a function that define how the state transitions
@@ -32,21 +32,16 @@ using ..type, ..mcts, ..util
     aggressively explore new state.
 
 # Return
-  - `(bestNextState, BestFinalState)::Tuple`
+  - `(bestNextState, BestFinalState)::@NamedTuple{bestNextState::T, bestFinalState::T}`
     the best next state and the best final state
 
 # Example
-```jldoctest
-julia> 
-```
-
-# TODO
-  [] update example
+    Refers to SQLLLM package
 
 # Signature
 """
 function runMCTS(
-  initialstate,
+  initialstate::T,
   transition::Function,
   transitionargs::NamedTuple,
   ;
@@ -54,7 +49,7 @@ function runMCTS(
   maxdepth::Integer=3, 
   maxiterations::Integer=10, 
   explorationweight::Number=1.0,
-  )::NamedTuple
+  )::@NamedTuple{bestNextState::T, bestFinalState::T} where {T<:Any}
   
   root = MCTSNode("root", initialstate, 0, 0, 0, 0, false, nothing, Dict{String, MCTSNode}())
 
@@ -88,8 +83,8 @@ function runMCTS(
     end
   end
 
-  bestNextState = selectBestNextState(root)
-  besttrajectory = selectBestTrajectory(root)
+  bestNextState = selectBestNextNode(root)
+  besttrajectory = selectBestTrajectoryNode(root)
 
   return (bestNextState=bestNextState.state, bestFinalState=besttrajectory.state)
 end
diff --git a/src/mcts.jl b/src/mcts.jl
index 1fb9133..fcbb0a6 100644
--- a/src/mcts.jl
+++ b/src/mcts.jl
@@ -1,6 +1,6 @@
 module mcts
   
-export selectBestNextState, selectBestTrajectory, backpropagate, isleaf, isroot, selectChildNode,
+export selectBestNextNode, selectBestTrajectoryNode, backpropagate, isleaf, isroot, selectChildNode,
         expand, simulate, makeNewState
 
 using GeneralUtils
@@ -20,18 +20,9 @@ using ..type
   - `childNode::MCTSNode`
     the highest value child node
 
-# Example
-```jldoctest
-julia> 
-```
-
-# TODO
-  - [] update docs
-  - [x] implement the function
-
 # Signature
 """
-function selectBestNextState(node::MCTSNode)::MCTSNode
+function selectBestNextNode(node::MCTSNode)::MCTSNode
   highestProgressValue = -1
   nodekey = nothing
 
@@ -72,20 +63,11 @@ end
   - `childNode::MCTSNode`
     the highest value child node
 
-# Example
-```jldoctest
-julia> 
-```
-
-# TODO
-  - [] update docs
-  - [x] implement the function
-
 # Signature
 """
-function selectBestTrajectory(node::MCTSNode)::MCTSNode
+function selectBestTrajectoryNode(node::MCTSNode)::MCTSNode
   while !isleaf(node)
-    node = selectBestNextState(node)
+    node = selectBestNextNode(node)
   end
 
   return node
@@ -99,14 +81,12 @@ end
     leaf node of a search tree
   - `simTrajectoryReward::T`
     total reward from trajectory simulation
+  - `discountRewardCoeff::AbstractFloat`
+    A discount reward coefficient to reduce future reward. The futher in the future the lower
+    reward it is now.
   
 # Return
-  - `No return`
-
-# Example
-```jldoctest
-julia> 
-```
+  - `None`
 
 # Signature
 """
@@ -166,11 +146,6 @@ isleaf(node::MCTSNode)::Bool = isempty(node.children)
   - `isrootnode::Bool`
     true if the given node is root node, false otherwise
 
-# Example
-```jldoctest
-julia> 
-```
-
 # Signature
 """
 isroot(node::MCTSNode)::Bool = node.nodekey == "root" ? true : false
@@ -187,11 +162,6 @@ isroot(node::MCTSNode)::Bool = node.nodekey == "root" ? true : false
   - `childNode::MCTSNode`
     the highest value child node
 
-# Example
-```jldoctest
-julia> 
-```
-
 # Signature
 """
 function selectChildNode(node::MCTSNode)::MCTSNode
@@ -201,9 +171,6 @@ function selectChildNode(node::MCTSNode)::MCTSNode
   # loop thought node children dictionary to find the highest progress value
   for (k, childNode) in node.children
     potential = childNode.progressvalue + childNode.reward
-    if childNode.reward > 0 #XXX for testing. remove when done.
-      println("")
-    end
     if potential > highestProgressValue
       highestProgressValue = potential
       nodekey = childNode.nodekey
@@ -214,34 +181,26 @@ function selectChildNode(node::MCTSNode)::MCTSNode
 end
 
 
-""" Expand selected node 
+""" Expand selected node.
 
 # Arguments
-  - `a::T1`
-    One of YiemAgent's agent
   - `node::MCTSNode`
     MCTS node
-  - `state::T2`
-    a state of a game. Can be a Dict or something else.
-  - `decisionMaker::Function`
-    a function that output Thought and Action
-  - `evaluator::Function`
-    a function that output trajectory progress score
+  - `transition::Function`
+    A function that handles state transition.
+  - `transitionargs::NamedTuple`
+    Arguments for transition()
+  - `totalsample::Integer`
+    Total number to sample from the current node (i.e. expand new node horizontally)
   
 # Return
+  - None
 
 # Example
 ```jldoctest
 julia> 
 ```
 
-# TODO
-  [] update docstring
-  [] try loop should limit to 3 times. if not succeed, skip
-  [] newNodeKey ∉ keys(node.children). New state may have semantic vector close enought to one of existing child state. Which can be assume that they are the same state semantically-wise. 
-  [x] store feedback -> state -> agent.
-
-
 # Signature
 """
 function expand(node::MCTSNode,transition::Function, transitionargs::NamedTuple; 
@@ -255,6 +214,14 @@ function expand(node::MCTSNode,transition::Function, transitionargs::NamedTuple;
       newNodeKey::AbstractString = result[:newNodeKey]
       newstate::AbstractDict = result[:newstate]
       progressvalue::Integer = result[:progressvalue]
+
+      """
+      [] newNodeKey ∉ keys(node.children). 
+            New state may have semantic vector close enought to 
+          one of existing child state. Which can be assume that they are the same state 
+          semantically-wise i.e. De javu. This could be used to recall lessons for this 
+          similar situation to improve decisionMaker and evaluator. 
+      """
       if newNodeKey ∉ keys(node.children)
         node.children[newNodeKey] = 
           MCTSNode(newNodeKey, newstate, 0, progressvalue, 0, newstate[:reward], 
@@ -270,30 +237,25 @@ end
 """ Simulate interactions between agent and environment
 
 # Arguments
-  - `a::T`
-    one of YiemAgent's agent
   - `node::MCTSNode`
     node that will be a simulation starting point.
-  - `decisionMaker::Function`
-    function that receive state return Thought and Action
-  
+  - `transition::Function`
+    A user function that handles how state transition.
+  - `transitionargs::NamedTuple`
+    Arguments for everything the user will use within transition().
+  - `maxdepth::Integer`
+    maximum depth level MCTS goes vertically.
+  - totalsample::Integer
+    Total number to sample from the current node (i.e. expand new node horizontally)
+    
 # Return
-  - `simTrajectoryReward::Number`
-
-# Example
-```jldoctest
-julia> 
-```
-
-# TODO
-  - [] update docs
+  - `(simTrajectoryReward, terminalstate)::Union{Tuple{Number, Dict{Symbol, <:Any}}, Tuple{Number, Nothing}}`
 
 # Signature
 """
 function simulate(node::MCTSNode, transition::Function, transitionargs::NamedTuple; 
   maxdepth::Integer=3, totalsample::Integer=3
   )::Union{Tuple{Number, Dict{Symbol, <:Any}}, Tuple{Number, Nothing}}
-
   simTrajectoryReward = 0.0
   terminalstate = nothing