4sh.dev

Codex, Three Months In

Thu, 07 May 2026 00:00:00 +0000

Three months of daily-driving Codex: release tracking, a maturing plugin system, and the unglamorous polish that makes a side project feel lived-in.

Building HiveLabs: Taking the AI Agent Team Concept to Production

Fri, 13 Mar 2026 00:00:00 +0000

A couple of weeks ago I wrote about 4shClaw, a personal multi-agent AI assistant running with Docker. It works. Agents spin up in containers, coordinate through a shared ledger, and build a game called GLORP autonomously. The architecture proved out the core ideas: container isolation, declarative capabilities, ephemeral agents, lead-agent orchestration.

But 4shClaw is a personal tool. Single user, SQLite, filesystem IPC, Node.js host. That’s fine for me. It’s not fine for a team of five engineers at a fintech company who want the same thing on their infrastructure, with audit trails their compliance team will accept.

Building 4shClaw: A Multi-Agent AI Assistant That Runs Your Life (and Builds Its Own Demo)

Sat, 28 Feb 2026 00:00:00 +0000

I’ve been trying to build personal AI assistants on and off for a while. Bots backed by LLM APIs, cron jobs that would run some automated task. None of them stuck really.

Then OpenClaw came along and kicked off the personal AI assistant movement. It looked like what I wanted, until I looked under the hood. The thing wants access to everything: your email, your calendar, your GitHub, your files, all funneled through a single Node.js process with shared memory and no real isolation. One bad prompt injection through an email summary could, in theory, access your GitHub token, your calendar credentials, and every other secret the system knows about. That’s not a hypothetical either: multiple critical CVEs in 2026 alone, all stemming from the same architecture.

Why I'm Building Codex: A Digital Library Server in Rust

Thu, 05 Feb 2026 00:00:00 +0000

I love Komga. It’s been my go-to for managing comics, manga, and ebooks for years, and it genuinely does the job well. The UI is clean, the feature set is rich, and the community around it is great. If you self-host a digital reading collection and haven’t tried it, you should.

But after years of daily use, I kept bumping into a few limitations that I couldn’t work around. And eventually, the itch to build something of my own became too strong to ignore.

On-Demand Workloads with Sablier - Scale to Zero for Homelab Efficiency

Sun, 12 Oct 2025 00:00:00 +0000

Save homelab resources by scaling unused services to zero with Sablier and Traefik integration for automatic service wake-up on demand.

Bee AI n8n Workflows

Thu, 03 Jul 2025 00:00:00 +0000

The n8n-nodes-bee-ai Package

Blog Post: Bee AI n8n node

Github Repo: AshDevFr/n8n-nodes-bee-ai

Sub Workflows to fetch them all

Bee AI - Fetch all Conversations

Note: the Conversation model is a nested object, so because of that, I added a code node to flatten the results.

Conversation (GET /v1/{userId}/conversations/{id} response):

{
    "conversation": {
        "id": 3456789,
        "summary": "...",
        ...
    }
}

Bee AI - Fetch all Facts

Bee AI - Fetch all Todos

Bee AI - Fetch all Locations

Workflows

Bee AI - Backup v2

Uses the Fetch all x workflows to get all the data, then insert it into a MongoDB database anf a json file in Google Drive.

Bee AI n8n nodes

Wed, 25 Jun 2025 00:00:00 +0000

I recently developed a custom n8n node package that connects Bee AI with the n8n workflow automation platform, opening up new possibilities for automating personal AI data.

What is Bee AI?

Bee AI is a wearable personal AI device that sits quietly in the background, capturing and processing your daily interactions. Unlike traditional smart assistants that require explicit activation, Bee continuously learns from your conversations, tasks, and locations, transforming these moments into actionable insights, summaries, and reminders.

RAG Agents with LangChain and LangGraph

Mon, 28 Oct 2024 00:00:00 +0000

Self-RAG (Self-Reflective Retrieval-Augmented Generation) is a framework that combines the benefits of retrieval-augmented generation (RAG) with self-reflection, allowing large language models (LLMs) to adaptively retrieve passages on-demand and generate more accurate responses.

Langgraph recently published a blog post on Self-RAG with their own implementation.

I really like the idea of validating the retrieved information. In that past I have noticed that, while vector databases will return documents that usually match the input query string, some may contain irrelevant content. Having the ability to validate and correct this is a great feature for any RAG setup.

Adventures in Greenhaven

Wed, 23 Oct 2024 00:00:00 +0000

I recently published my first tabletop role-playing game (TTRPG) designed specifically for young hearts, Adventures in Greenhaven.

This project matters to me because I want to make tabletop gaming accessible and enjoyable for kids.

I’ve always been passionate about sharing the magic of D&D with others, but as my children grew older, I realized that traditional D&D wasn’t quite suitable for them yet. So, I decided to create a game that captures the essence of D&D, but with simpler rules, more accessible storytelling, and a focus on fun and adventure.

Game Dev - Unity

Thu, 02 Sep 2021 05:47:35 +0000

After spending years trying to build mini D&D games using JS, Elm, Elixir, etc… I decided to give a shot to Unity.

Dungeon generator

I decided to jump right away into Unity and build a procedural dungeon generator from scratch.

As expected the result was not great (pretty ugly let’s be honest). It’s not that C# is difficult, but you have to learn a new tool (Unity) which comes with a lot of new concepts and options that if you don’t know makes your task more complex.

Encounters v0.3.0 (Alpha) - Dynamic lightning is coming

Sat, 16 May 2020 22:43:29 +0000

It’s been few weeks since my last update. I have been quite busy working on a lot of interesting stuff. Some related to this project, some a bit less.

Here is a preview of the Dynamic lightning I have been working on. It’s not live for now since it needs a lot of small adjustments before being 100% usable.

From Kubernetes to Gitlab-ci in less than 10min

Sat, 16 May 2020 22:32:04 +0000

I have been playing a lot with Kubernetes lately, from creating a cluster from scratch on bare metal, setting up a ELK stack, Prometheus metrics to setting up a CI/CD using Gitlab CI.

I found the last one so easy that I made a video for it.

I have been using a DigitalOcean Kubernetes cluster for this video, it was super easy and I got $100 to play with it for 60 days.

Encounters v0.2.0 (Alpha)

Sun, 26 Apr 2020 05:43:33 +0000

Ok now it’s getting a bit more serious.

We can now create, save and restore maps in the editor:

This tool is available here: https://encounters.4sh.dev

Encounters v0.1.1 (Alpha)

Thu, 23 Apr 2020 22:48:17 +0000

I’m still playing with canvas and I plugged the dungeon generator I worked on a year ago.

This is the result:

This tool is available here: https://encounters.4sh.dev

Docker: Multi-stage & Caching

Tue, 21 Apr 2020 05:00:50 +0000

Multi-stage

In the beginning

When we first started to build docker images, long before the multi-stage syntax, our projects would look something like this:

We would have a base docker image containing the dependencies shared by the development and the production image, then one file for each final image.

The script build.sh shows that we first build the base image tagging it as base_image, then depending of the argument passed to the script we would build the final image.

D&D Toolbox

Mon, 20 Apr 2020 04:34:16 +0000

The context

With the COVID-19 and the shelter in place, there is not much opportunities to play D&D face to face with friends.

Some groups decided to go to platforms like Roll20 or Fantasy Ground. While I love those apps they are lacking something in my opinion: an integration with DnD Beyond.

I personally have a LOT of digital content on DnD Beyond and the idea of buying it again on another platform is not something I am considering.

D&D Beyond DM Screen

Mon, 20 Apr 2020 03:40:00 +0000

Few months ago, I worked on a Chrome extension to make my life easier when DMing D&D using DnD Beyond characters.

DM Screen Extension Screenshot

D&D Beyond Campaign DM Screen

The extension has a simple goal: providing the characters’s stats in a useful way and refreshing the data when the character’s sheets are updated.

Without the extension

With the extension

When using the embedded version of the DM screen:

When using the popup version:

Minecraft 1.15 power by docker

Wed, 15 Apr 2020 06:05:40 +0000

Few years ago I created a docker image for me to play on Minecraft with friends.

I have been updating this image from time to time but basically it’s almost always compatible with the new version since it’s building the game server from the sources.

The project can be found here: https://github.com/AshDevFr/docker-spigot

The docker image can be found here: https://hub.docker.com/r/ashdev/minecraft-spigot

I provide the image with an ubuntu base or an alpine base which is much smaller.

One step in the Progressives Web Apps

Fri, 15 Apr 2016 11:46:41 +0000

Few months ago, a friend of mine @florpeliere started to work on progressives web apps. First, I was intrigued, but not that much. Then he gave us a talk about them, and I started to realise the potential of this concept. Well, it is not a huge change, it is something which is used for a while; but now, there is a name on it and an official specification.

A web app on my phone, with offline data, ok but what kind of app ?

Docker's 3rd birthday celebration

Wed, 23 Mar 2016 22:27:24 +0000

The event

This week is the Docker’s 3rd birthday. Around the world, a lot of meetups were organized with the same program.

For this event the Docker team has created a specific presentation with a fun training on how to build, ship and run a distributed application with ease.

The slides of the presentation :

The training was in two parts:

First, a self-paced beginners’ tutorial for attendees to learn Docker.

Hands-on Docker in Paris the 22nd of March (Docker's 3rd birthday)

Tue, 23 Feb 2016 12:51:00 +0000

Edit: Due to the Docker Meetup in Paris, the Hands-on Docker is rescheduled to the 22nd of March instead of the 24th of March.

Hi!

Few months ago, I gave a talk about Docker (the article). During this talk I saw that a lot of people are really interested by Docker but did not know where to start.

So, I decided to create a Hands-on Docker to help them understand how to use it. As front end developer, the hands-on will be nodeJS/mongoDB oriented. The same principle could be applied to anything (Java, php, …).

Blogular

Wed, 10 Feb 2016 18:55:53 +0000

During the last past year, I trained a lot of people on AngularJS in my company. Lately, I was thinking that our repository was old and not really good looking.

Then, I had an idea, what if I wanted to train people outside of my company, like in university for example. So with this idea I decided to create a new set of exercises to learn how to develop a web application using AngularJS. That is exactly what Blogular is.

EmberJS

Tue, 09 Feb 2016 19:48:28 +0000

Last week, I gave a talk about EmberJS.

As a long time user of AngularJS 1.x some people were expecting a comparaison between these two frameworks. My point was more about what is Ember, what is the good and the bad with this framework.

I was hoping to give to people the envy of trying it. And after the talk some of them told me that they will try.

I am currently working on a simple hands-on training on EmberJS. I will probably provide it in few weeks in Paris. Let me know in the comments if you are interested.

ngMockStorage

Mon, 21 Dec 2015 19:49:00 +0000

Hi guys, I just released a first version of a new library for AngularJS.

The idea is to have a mock in your AngularJS application, but not deployed on the back side. With this kind of mock you are able to deploy an offline sandbox version of your website.

The library decorates the $http service and uses the localStorage or sessionStorage to store your data.

You will find the library there : github / npm

Talk about Docker

Fri, 06 Nov 2015 13:13:01 +0000

Few weeks ago, as every month, my company has organised their Tech evening. This time, it was about Docker.

As a long time user of virtualization and for the past year of Docker, I offered to talk about how to integrate docker in our everyday work.

As a front end developper, I use very often Gulp, Grunt and/or Node.js in my projects. These tools are pretty awesome but when I deal with external libs I have to be really careful of what I put in my dependencies file.

Hi!

Thu, 05 Nov 2015 12:37:20 +0000

I have been pondering for a long time on the idea of creating a blog, but I was not quite sure on the subject to write on.

For the past 6 months I started to do a lot, from talks about Docker to creating AngularJS training.

Some of these were for my own purpose and other for my company. But it gave me the idea to share my experience of what I do, what I have done, my issues, etc. Maybe my little contribution will help some of you.

Projects

Mon, 01 Jan 0001 00:00:00 +0000

projects