Middleware

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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::c:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::;;;;;;
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::c::c:::c:cc:::::c::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::;;;
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::c:cccccccccllodddddxdOxxxxxkxxxxkOxxdxddddoollcccccccccc:::c:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:::::::::::::::::::::::::::::::::::::::::::::::ccc:::::c:c:c:cccccccclododdk0kkxxxdxddox0kOdkokoOoxoddOdOoOdOxkkKOOxxddlccccccccccccccccccccccc::c::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:::::::::::::::::::::::::::c::::c:::ccc:c:cc:ccccccccccccccccclddddxxxddoookOxxddoddolokkkOdkdkxxdxdxxkxxxxxxxdkOkOxOxxOkkkOxdlcccccccccccccccc::ccccccc::cccc:c::::c:c::cc:c:::::c:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
::::ccc::c:cccc:::cccc::ccc:ccccccc:cccccccccccccccccccccloooxlkOxddolocccxO0OOxOdkdolkOkkKO0x0kxxkxOOKO0OOKkxkOk0kOdkdxxOoO00kkxdoccccccccccccccccccccccccccccccccccccccc:ccccccccccccc:::::c::c:c:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
ccccccccccccccccccccccccccccccccccccccccccccccccccccoooddooloclkOOxxxdoclcdOk00kkxxokdkOkkKx0x0kkkxxK000OKk0kOdK0XOK00KO0dxO0kkkOxOkxkxocccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc:::c::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
ccccccccccccccccccccccccccccccccccccccccccccccccclllxkdoolc::llkk0OkxdlooolOx0O0xkxkkxkOkOKk0O0OOOxOKKOKOKOKOdOKKKKOXOXOOxKKX0OOdxkOd00OOxdlcccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc:c:cc::c::::::::::::::::::::::::::::::::::::::::::::::::::
ccccccccccccccccccccccccccccccccccccccccccccclllllcolxkdolclclloOx0Oxdodxdokx000Okk0OOOKk0000O00O000XXKX00XKOx0KNKXK0XOKxO0XKXKKXKKkx00O0kkkxdlcccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc:cc:ccccccc:ccccc::::::::::::::::::::::::::::::::::::::::
cccccccccccccccccccccccccccccccccccccccccclllcccc:ccxlOOolodollckdk0OddxOOkOkkKO0kxxddkdOxxxkdxOkddkOkxxkOOkkOOKKKKXXXK0OKXKNKKKKKO0XXKOxxO0Od0Kkocccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc:c:c:cc:::::::::::::::::::::::::::::
ccccccccccccccccccccccccccccccccccccccccl:ollc::clloxolkkoddddolxxx00OxddooxoOOOkkxxdokkOxkxxdxxkkx0KkOOOkOkxxkKkOOdkxkX0XNNXXXXKO0XXXNXXKkkOkKX0kxocccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc:c:::c::::::::::::::::::
cccccccccccccccccccccccccccccccccccccc:::::dlcccllllkllcdOxxxxxxOdlOOkkddolkoOxO0OOxxdk0kkOOkxkkxOO0KOK0K0kkk00K0kOkxxx0kxxOO0XKK0XNXXXXXXXKk0O0K0kxxdlcccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc:ccc:cc:::c::::::
ccccccccccccccccccccccccccccccccccccc:::::::lc:cclloxlcclk0kxdllddlOdOOOdodkdxd0O00kkxOKkOOOkxkOkkOKXKK0k0kx00K0K0K0OxK00Ok0xxdd0XKNWNXXXX00XNXKkk00kk0Oocccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc:::
ccccccccccccccccccccccccccccccccxdlcccc::::::cocclllxocldodOkoolokokokOOkdxOOxdk0O00kkKkk0OkOOOOOOOKXKKKOkOkKK0K0OK0k00X00KKK0xk00kkOKXNN0KXNNXXXKOkO00kOdcccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
ccccccccccccccccccccccccccccccc;;doooocccc::::codoooxclolllk0koddkxoookkOOxO0ddd0OO0OOKkOOOOOOOkxxkKKOOOKKOOKX0O000O00K0K00000OKXKOxKOkx0XNXNNXNNNX000KKxkklcccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
ccccccccccccccccccccccccccccc:;;;;dllcoooc::::coxkclxllkoooldk0xdkOolooOkkOOKxox00kOxKk0OOO0kxddook00kkxxxOOOKKK000OKXKXK0OKO0KXXXXKKkkkXX0KNWNNNKKXNKkOXOxOxllccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
cccccccccccccccccccccclcclc;;;;;;;:d:::clollcc::ldocxokdooolldxkxOOllodkOxk00xxxdkkkxkOkdkkxkkkxxdkK0kkOxxd0k0kKOOK00KXX0KO0OXXXXKXKKOON0OK0kOXNXXNNNNXOkXO0XKlccclclccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
cccccccclcclcclcccclclllc:oc;;:::;;:x::coolcooocclxlkddoolloooxkkO0dxxddxkxxkdoookxxxxldkOOxxdOOkxkK0OkxxdOxxxO0OkkK00O0OOOKKXNXXXKK0XNX0OkKKk0KKNWNNNNNK0KXXkkllllllllcclccllcccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
llllclllllllcclllllllllc;,;cc:;::::::d::odccllcodoldOOxddkxxdlclod0kdooxokdxOdllldkxxddxxdkOOkxxxd0XOkOOkx0O000kdxkOxkkk0k00O0KXN0OKXXXKXNXX0OXK00NWNNNXKKOXXOxklllllllllllllllllllllllcllllcccccccccccclccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
llllllllllllllllllllll:,,;;:o:::;:::;ld::d:c::::clllxodooclccloloxoxxxxdodOkkOolookxddookxOxxkOkkxKXO0O0O00K00kxx000kOkxdkO0KK0OOOOXXXXKNNX0XKKKXOOXXKKKXNNO0XxkOolllllllllllllllllllllllllllllllllllcllllllllccclllcccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
llllllllllllllllllllc:,,;;;;;l:clc;:::oo:ol::c::::lo:olclllllloloodlolkkxdx0kOxoldxxllooxkkkxdoooOXNK0OOOKKOKOxx000OKOOxkOOOxkkkO0K0O0KXXXXXNXWKKX0OXNXXNNNXk0KKN0lllllllllllllllllllllllllllllllllllllllllllllllllllllllllclllllllcclcccccccccccccccccccccccccccccccccccccccccccccccccc
lllllllllllllllllllc:;,,;;;;;;c:;coo;::docl:::cccoc::collddclldoollxoddooxkOOk0xdkxxddddkdokddoookO0kkkkkkO0O0k00OO0KKkOOKKKOOO0OkOOkddKKKXKXNNK0OOXKOXWWNWNN0NNOkolllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllcccccccccccccccccccccccccccccccccc
lllllllllllllllllll;,;;;;;;;;;;::;;lol::dll::::ldl:::ccoccldoodolllldxxddxxO0OkxOkooddxkddxdkooloOO0xxxxOkOkOO0OOOO0000K0KXK0O00KKOOOxxkx0KKX0K00K0OKOkXWNX00XKXOxxllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllclccccccccccccccccccccc
llllllllllllllllll:,,,;:;:;;;;;;;;;:d:ll:xkc::dd::::;::clc:cxkdooooddxolokxxdooxOdooooldkxdddxdlo00OxkkkkkOkxkk0O0OkkKKKK0K0KX00XX0000kkOx0K00NXKXX00K0XNKKNXWkO0xkdllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllcccccc
lllllllllllllllllc,,,;;;l;;;:::,,;::xc:::c0dcoc::::::::::c::lokdddoooddodooxlooxdkxooollodddddxldKK0OOO0OkkkkkkkkkkOO00OOOO0KKKKNXKKOKXkkKK0O0XNXXNNK0KKXXNNWNX0KKN0llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
llllllllllllllll:;,,,;;;;lc;;:c:;;;::o:;;:lOkdddooolllolllllxdddddolooxdooddookddodkkolllloxkkkxx0KKKXKOkkkOO0OOkOOkx0Oxk000kkOO0K0OK0OkKKK0kkKKNNNX0XKKkKNNNNK0XKkxllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
llllllllllllllll:,;;;,,,;;:;;,,:;:c:c:;;;;cll::::;:::::::cccoc:cooxolldxooxdookoddxkOO0xxdddoocdxNKOOOO0K00KXK000kkkk0kxkOOOOk0O0k0000KKOkKKkxONXX0XNN00x0NX0000KOxxolllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
olllllolllolooll;',;;;;;,,,;;;;;:;:lloc;;c:;ld:::::c;;;;c::ccll::lcdxllxdkxxkkOkkxxOxxdOkdloloxxOXKkkkOO000OXXXXK0k0000O00OkOkkXddkOKKXXN0O0K000XXXNKXX00NNXXKNO0kxkooooooooooollllollllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
oooooooooolloooc,,,;;;,;;;;;';;;c;;;;:dc:;;;:ol:::;:c::c::::::coc:lclOOkdxxkxkdddxxOOxxxdxkoxkxxKXKKkxk0000K0OOOO00K00XKKK0kxxXO0xdkKX00K0kOkOxd00K0NXO0XKKKNXN000XKoooooooooooooooooooooooolooooooollolllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
ooooooooooollll:,',,;;;;,,:;;;:l;:;;;;:ooc:;;;:c::;;;:c:lllc::::ll:dlodxxxdokxdoddddOooclok00Oxx0XKNX0xO0OOKK0OOOkkkxkXKXXO00Kkkkk0OkKK00OkxxkkxOXKK0KKKKOONXNKOXXkdoooooooooooooooooooooooooooooooooooooooooooooolooooolllloollllllllllllllllolllllllllllllllllllllllllllllllllllllllll
ooooooooooooooo:,,,,,,;;;;,,,:ccc:;;;c;,;;::::;lc;;;::::::::::::;cdllcxokXNO0kkxollcoklkO00OO0OkkXXWNNX0odO0xdxOO000O00OOXKOOOkk0K0OkOK0000OO0kOk0KKKNKkKkXN00OOKxxoooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooloooooooolllllolllllllllllllllllllllllllllllllllllll
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oooooooooooooooc;,,,;;;;;;,';,,,,;:c:;cclc::c::;:cllc::::::::;:cc:::cldkkXKK0O0NNNX000xKN00OOOk0KKK0WMMWNNXNNWWWWWNNNKKkXOX00K0OkdkkOkxOOOkOkk0K0O0XXKkKKKK0XXOkOOddddooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooolllolllllllllll
ooooooooooollooc:',,,;,;;;';,;,,;;,:c',;;;;;;;;;:;;c;:llloollooc:;;::;cxKXKNWMNXXXNW0XOKK0OOO0koxOxxONNWWWXWMMMMMMMMMWKXXXK00K0kkxxOOxd0K0OK00kOOkk0OKXN0OKKKO0kxdoooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooool
ooooooooooollool:;,,;;;;;;,,;;,;;,,;lc,,,,,,,,;;,;;:l;;;;;;;ccdkdolc:;;lod0NWXXXXNK00KO0KOOkOklloKoloONWWNNNNNNWWMMMMMXNXXK000O0OkkO00O0XKOOkO0kOK00K0Ox0XK0Okxddooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
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Multi-Agent LLM Middleware: Lessons from Marketing Accelerant

Marketing Accelerant is an AI-powered marketing analytics platform I worked on at Entropy Labs. It runs 15+ specialized LLM agents for Brand Voice, Creative Content, CMO Strategy, SEO, Email Campaigns, Google Ads, Meta Ads, Video Studio, and more, all serving enterprise clients through a single FastAPI backend. The agents themselves aren’t the hard part. The hard part is everything around them: model selection, context management, cost control, error recovery, and human approval. This post covers the middleware architecture that makes it work in production. ...