How to add memory to Llama 4 while using it through CMD using groq api?

I tried adding a AI on a batch file, but the problem is every time I write a new statement, the command overwrites all the text, hence I am not able to access previous memories.

@echo off

setlocal EnableDelayedExpansion

set "memory_file=memory.txt"
if not exist "%memory_file%" (
  echo.>"%memory_file%"
)

:loop
color 7
set /p user_input=Prompt: 
if /I "%user_input%"=="exit" goto end


**set "previous_memory="
for /f "usebackq delims=" %%A in ("%memory_file%") do (
    set "previous_memory=!previous_memory!%%A"
)**

color a
echo { > body.json
echo   "model": "meta-llama/llama-4-scout-17b-16e-instruct", >> body.json
echo   "messages": [ >> body.json
echo     { >> body.json
echo       "role": "system", >> body.json
echo       "content": "You are Julia, a helpful assistant.  Here is your previous memory: !previous_memory!" >> body.json
echo     }, >> body.json
echo     { >> body.json
echo       "role": "user", >> body.json
echo       "content": "%user_input%" >> body.json
echo     } >> body.json
echo   ] >> body.json
echo } >> body.json

curl https://api.groq.com/openai/v1/chat/completions -s ^
-H "Content-Type: application/json" ^
-H "Authorization: Bearer gsk_***************************" ^
-d @body.json > response.json

for /f "delims=" %%A in ('powershell -Command "Get-Content response.json | ConvertFrom-Json | Select-Object -ExpandProperty choices | Select-Object -ExpandProperty message | Select-Object -ExpandProperty content"') do (
    set "ai_response=%%A"
)

echo Julia: %ai_response%


**(
   echo("role":"user","content":"%user_input%"),
   echo("role":"assistant","content":"%ai_response%"),
)>>"%memory_file%"**

goto loop

:end
REM del body.json
REM del response.json
endlocal

Problem 1: (quibble) If set /p receives a response of just Enter then the variable will remain unchanged

set "user_input="
set /p "user_input=Prompt: "
if not defined user_input goto loop

Problem 2: (quibble)

(
 echo {
 echo   "model": "meta-llama/llama-4-scout-17b-16e-instruct",
 ....
 echo }
)> body.json

will recreate body.json without all the redirections (as you've used later...qv)

Problem 3: (a)

echo(a string

should be

echo (a string

because a cmd quirk is that if certain symbols follow echo then they are interpreted as part of the echo command. ( is one of those symbols. This is often exploited as

echo/%I_may_be_empty%

which will show an empty line if I_may_be_empty is not assigned, but if the / is Space then the response will be the current echo state (Echo is on/off)

Problem 3: (b)

You are correctly using the (...)>>filename construct to extend the file BUT the first ) closes the first ( - not the previous (. You need to indicate to cmd that the ) is to be treated as an ordinary character, not one with a special meaning by escaping the character - prefixing it with a caret (^) so use ^) here. This applies to a number of symbols, including ^, but not % which is escaped by a second %.