Vitalii Honchar

Senior Engineer at Revolut. Ex-Pinterest, Form3. Exploring what's possible when a senior engineer uses Claude Code to build products across any stack.

[Vitalii Honchar @vithonchar]

Learn how to build your own AI agent harness in Rust with a ReAct loop, shell tool execution, a CLI, and local JSONL chat storage. https://t.co/NS7yovMBhS

[Vitalii Honchar @vithonchar]

Just published a new post about AI Agent harness: https://t.co/ET3VT81oCY

In this post I'm explaining how I built AI Coding Agent in Rust and what core components are here.

[Vitalii Honchar @vithonchar]

Last few days I was super busy so didn’t write any code for EliCode. But the prototype is almost done, need to polish and prepare a blog post about it. Hopefully will do it tomorrow

[Vitalii Honchar @vithonchar]

Just started refactoring of EliCode to make it look less like the prototype and more like Rust app

[Vitalii Honchar @vithonchar]

I had sparing day today at the kickboxing. Awesome reset after the working week💪

[Vitalii Honchar @vithonchar]

@Heliocene Yeah I tried to build TUI and GUI in Rust as well and realised that it’s very hard. So for now I decided to focus on the core AI Agent with CLI without any *UI due to complexity of building UI.

I decided to return to GUI when will be happy with the core part of an agent

[Vitalii Honchar @vithonchar]

I plan to write next blog posts:

1. How to develop own AI Harness (AI Coding Agent).
2. How to make own AI Harness secure and don't allow to hack my machine.

To write these blog posts I'm developing EliCode - my own AI Coding Agent in Rust.

[Vitalii Honchar @vithonchar]

#rust #buildinpublic #aiagent

[Vitalii Honchar @vithonchar]

I was considering 2 options to store sessions for EliCode:
1. SQLite
2. Raw JSON

I choose to store sessions in JSON but append only format - JSONL.

[Vitalii Honchar @vithonchar]

So I implemented JSONL support for storing sessions data in EliCode. Will include these considerations in the upcoming blog post as well.

[Vitalii Honchar @vithonchar]

I don't commit to build GUI for AI Agent right now. It's just a dream to have a high quality GUI for coding agent. Will finish my blog posts and next see what can I do next.

#rust #aiagent #aiharness #buildinpublic

[Vitalii Honchar @vithonchar]

Building custom AI Agent allows me to fully influence the code base and see how it will work.

But I also have a dream around it. I chose Rust because I want to make a good GUI for AI Agent at the target state.

[Vitalii Honchar @vithonchar]

I'm currently writing a new blog post for https://t.co/V2hsXJY3Zz about building own Coding AI Agent in Rust. It will be a simple clone of Claude Code but it's very interesting to build it by hands and understand every part.

[Vitalii Honchar @vithonchar]

@ChShersh I write my technical blog btw: https://t.co/W95gWX93lh

And currently working on a new article about Rust and AI Agent development

[Vitalii Honchar @vithonchar]

But core part of Claude Code clone - AI Agent will be untouched due to limited time which I can use to build it. That's why I changed my plan and focused on the core part of an application - AI Agent with the no UI at all.

All executions work from CLI and print output to stdout.

[Vitalii Honchar @vithonchar]

For the Claude Code clone my original plan was to build extremely fast GUI AI Agent in Rust because Claude Code UI was too slow, but after starting building it with iced GUI library I realised that I need to spend too much time with GUI instead of AI Agents.

[Vitalii Honchar @vithonchar]

#buildinpublic #rust #aiagent

[Vitalii Honchar @vithonchar]

Today my Claude Code clone in Rust built the Telegram bot. It's first success execution of it and it works!

For now I support only BashCommand execution so AI Agent can execute any command. As result it produces Markdown file with list of messages and requests to LLM.

[Vitalii Honchar @vithonchar]

As result this AI Agent can be hacked with prompt injection and do with my computer whatever prompt said.

And this is my target actually. I want to simulate prompt injections in my AI Agent and play with AI Agent safety. I'm very excited about it.