Sérgio Marcelino

Head of Engineering @ iii
Building iii — a new substrate for software & agents.
Making agent infrastructure unreasonably simple.

[Sérgio Marcelino @SergioFilhow]

@saranormous https://t.co/kXDVST10sg
iii harness, the harness that can self extend

[iii @iiidevs]

Sergio is live and building out and taking the iii platform and harness from zero to fully built out and deployable products with DeepSeek v4.1 Flash!

https://t.co/mu4x2skDWf

[Sérgio Marcelino @SergioFilhow]

@Dimillian Couldn't find the license, is it just source available?

[Sérgio Marcelino @SergioFilhow]

lol I just remembered when GitHub announced they were storing code in the Arctic. Feels like decades ago, back when code was actually something worth preserving

[Sérgio Marcelino @SergioFilhow]

@johnfurr538500 @vineerpasam Lol yeah I wondered the same. "Isn't that what we do every day? 🤔"

[Sérgio Marcelino @SergioFilhow]

@Dimillian It's unbelievable, they just released the latest expansion and now they're announcing the same game to be purchased again

[Sérgio Marcelino @SergioFilhow]

https://t.co/69PJ69sVM4

[Sérgio Marcelino @SergioFilhow]

Asked iii to orchestrate the work with deepseek and delegating GUI Researcher and Front-end engineer to Astra. I asked it to create a Balatro looking Tic Tac Toe and it did!

[Sérgio Marcelino @SergioFilhow]

I'm working on a worker that shows storybook components and compares between versions, all within ADE and usable by the Harness for review

[Sérgio Marcelino @SergioFilhow]

@EdszSeren0 @luker2o @AkitaOnRails É isso que eu penso também, as gigantes so estão se importando em colocar mais dinheiro em infra, poucas estão pensando em otimizar a própria tecnologia para utilizar menos recursos

[Sérgio Marcelino @SergioFilhow]

@luccacerf O foda é que animação sempre precisa de muitas e isso pelo que percebi é fácil de automatizar. Inclusive quero testar o Astra fazendo uma cutscene no Unity

[Sérgio Marcelino @SergioFilhow]

@luccacerf Ah o RIG eu não fiz com Astra, eu não cheguei a testar, mas tenho um Rigger/Skinner profissional que ja deixou tudo certinho

[Sérgio Marcelino @SergioFilhow]

@luccacerf Sim, peço para usar o Blender MCP, mas percebo que o Astra cria muitas automações em Python. Ainda estou em testes muito iniciais, mas até agora ta muito promissor, consegui gerar animações muito boas só com uma foto do concept designer

[Sérgio Marcelino @SergioFilhow]

I disagree and I will prove it at some point with data. Saving this for later

[Roman @romxdev]

Micro-frontends are the worst architecture decision a web team can make.

[Sérgio Marcelino @SergioFilhow]

People are trying to build their own harnesses, iii can give you the bear bones for anyone to build a harness that suits each specific need in every area

[elvis @omarsar0]

Build and own your harness, folks.

Very few people understand the magic behind customizing and optimizing an agent harness for your work.

You can start seeing incredible results quickly, even with a minimal harness. Just better code, better outputs, better costs, better writing, and so on.

As an example, I see way too many people complain that they are tired of their out-of-the-box agent harness producing verbose outputs. If you built a harness, that's easier to fix with a system prompt optimized for you.

This is why Pi is getting insane adoption these days. You want to control your harness. I agree that it's hard to optimize where things stand, but self-improving algorithms will make it easier to learn from trajectories. And if you use local models, you can tune all of that end-to-end (through a co-evolution of the harness and the models) as you work with them.

Look into open-source projects like Eve, Exo, and Prime Agent, and you will see what I mean.

[Sérgio Marcelino @SergioFilhow]

@goon_nguyen https://t.co/kXDVST10sg

I think the problem might be the harness, this was 5h session with lots of prompts and I built quite a few stuff, all live. It costed $2 with over 1,000 API requests

[iii @iiidevs]

Sergio is live and building out and taking the iii platform and harness from zero to fully built out and deployable products with DeepSeek v4.1 Flash!

https://t.co/mu4x2skDWf

[Sérgio Marcelino @SergioFilhow]

@sophiamyang We build a kanban feature for the iii harness (which is extremely extensible) and a mini game with just $2 on deepseek.

[Sérgio Marcelino @SergioFilhow]

@sophiamyang https://t.co/kXDVST10sg

Watch this one, we built iii and this will be the next big thing for AI. It's a long session, I live streamed yesterday, but will post a shorter summarized video probably today

[iii @iiidevs]

Sergio is live and building out and taking the iii platform and harness from zero to fully built out and deployable products with DeepSeek v4.1 Flash!

https://t.co/mu4x2skDWf

[iii @iiidevs]

Sergio is live and building out and taking the iii platform and harness from zero to fully built out and deployable products with DeepSeek v4.1 Flash!

https://t.co/mu4x2skDWf