Articles and notes on AI engineering, open-source tools, and technical leadership.https://www.florian.bruniaux.com/en-ushttps://www.florian.bruniaux.com/blog/articles/claude-code-output-styles/https://www.florian.bruniaux.com/blog/articles/claude-code-output-styles/Claude Code selected flow-lean but skipped its footer. A casing fix showed why installation, selection, and behavior need separate evidence.Wed, 09 Sep 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/ai-data-center-debate-facts/https://www.florian.bruniaux.com/blog/articles/ai-data-center-debate-facts/Near Melun in Seine-et-Marne, Campus IA plans 11 data centers. The Élysée calls it France's largest AI campus. Three buildings are authorized.Sun, 30 Aug 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/campus-ia-fouju-etat-des-lieux-fr/https://www.florian.bruniaux.com/blog/articles/campus-ia-fouju-etat-des-lieux-fr/Près de Melun, Campus IA prévoit 11 centres de données en Seine-et-Marne. L’Élysée le présente comme le plus grand campus IA de France. Trois sont autorisés.Sun, 30 Aug 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/campus-ia-fouju-evidence-register/https://www.florian.bruniaux.com/blog/articles/campus-ia-fouju-evidence-register/Authorizations, energy, impacts, and opposition: this dossier collects the figures, sources, and open questions around Campus IA in Fouju.Sun, 30 Aug 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/campus-ia-fouju-registre-preuves-fr/https://www.florian.bruniaux.com/blog/articles/campus-ia-fouju-registre-preuves-fr/Autorisations, énergie, impacts, oppositions : ce dossier rassemble les chiffres, les sources et les questions ouvertes sur Campus IA à Fouju.Sun, 30 Aug 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/portable-agent-config/https://www.florian.bruniaux.com/blog/articles/portable-agent-config/A release model for instructions, skills, Output Styles, hooks, MCP definitions and BM25 routing without confusing installed files with working behavior.Tue, 04 Aug 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/flow-lean-fused-three-skills/https://www.florian.bruniaux.com/blog/articles/flow-lean-fused-three-skills/Flow Lean fused three response skills. Its historical eval beat each comparator and caught a candidate offering a migration against an inferred target.Tue, 28 Jul 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/your-claudemd-is-too-long/https://www.florian.bruniaux.com/blog/articles/your-claudemd-is-too-long/Your CLAUDE.md past 200 lines? Two independent Dev With AI talks found the same pattern: more rules make Claude less precise, not more.Sat, 04 Jul 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/context-engineering-portability/https://www.florian.bruniaux.com/blog/articles/context-engineering-portability/Portable instructions require neutral sources, generated runtime outputs, release controls, and behavioral tests. Native primitives alone do not provide portability.Thu, 18 Jun 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/context-engineering-team-system/https://www.florian.bruniaux.com/blog/articles/context-engineering-team-system/Personal CLAUDE.md to team AI instruction system for six engineers. How Méthode Aristote separates sources, shares modules, and catches behavioral drift in CI.Wed, 17 Jun 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/context-engineering-the-new-roles/https://www.florian.bruniaux.com/blog/articles/context-engineering-the-new-roles/Context engineering jobs: harness engineer, spec engineer, agent identity architect, AI eval engineer, four roles that didn't exist three years ago.Tue, 16 Jun 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/context-engineering-tools-map/https://www.florian.bruniaux.com/blog/articles/context-engineering-tools-map/Confusing RTK, lean-ctx, and prompt caching? They're four layers, not competitors. The map, three deep dives, and where your real Claude spend hides.Mon, 15 Jun 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/context-engineering-maturity-model/https://www.florian.bruniaux.com/blog/articles/context-engineering-maturity-model/Use L0 to L5 to diagnose context drift, then maintain adherence through observation, repair, and replay instead of treating setup as finished.Sun, 14 Jun 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/context-engineering-the-hidden-variable/https://www.florian.bruniaux.com/blog/articles/context-engineering-the-hidden-variable/Same model, same stack, opposite outcomes: +67% vs -19%. The variable isn't the AI. It's context engineering, and Princeton research explains exactly why.Sat, 13 Jun 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/claude-is-my-second-contributor/https://www.florian.bruniaux.com/blog/articles/claude-is-my-second-contributor/6 contributors in our git history. One is an AI. What the commit patterns actually look like after months of Claude Code, beyond the marketing claims.Tue, 12 May 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/claude-code-under-the-hood/https://www.florian.bruniaux.com/blog/articles/claude-code-under-the-hood/The concepts I wish I'd known before week one. 8 tools, 200K tokens, hooks as the only deterministic layer, and why config eventually takes 30-50% of your time.Fri, 08 May 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/where-to-start-with-claude-code/https://www.florian.bruniaux.com/blog/articles/where-to-start-with-claude-code/Choose between Claude Code and Cowork, then follow the Start, Build, or Scale path that matches your role and current operating problem.Fri, 24 Apr 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/from-afterthought-to-infrastructure/https://www.florian.bruniaux.com/blog/articles/from-afterthought-to-infrastructure/506 commits. 407 files. 8.6% of all repo activity. How AI config evolved from afterthought to infrastructure over 9 months on a real production codebase.Mon, 13 Apr 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/ai-velocity-is-bidirectional/https://www.florian.bruniaux.com/blog/articles/ai-velocity-is-bidirectional/Everyone talks about shipping 10x faster with AI. Nobody talks about accumulating debt 10x faster. 7 months of production data from a real EdTech platform.Fri, 27 Mar 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/non-tech-to-prod-in-10-days/https://www.florian.bruniaux.com/blog/articles/non-tech-to-prod-in-10-days/A non-developer modified 80 files in production in 10 days with Cursor AI. Exact timeline, AI config setup, and what it means for engineering teams in 2026.Mon, 09 Mar 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/uval-protocol-comprehension-debt/https://www.florian.bruniaux.com/blog/articles/uval-protocol-comprehension-debt/Jeremy Twei coined it. Addy Osmani popularized it. Margaret-Anne Storey extended it to teams. Here's what I built to fight all three.Thu, 19 Feb 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/articles/vp-engineering-to-builder/https://www.florian.bruniaux.com/blog/articles/vp-engineering-to-builder/12 years scaling teams from 4 to 30+, then I quit the VP title. AI lets a solo builder match what small teams ship. Here's exactly what changed.Sat, 07 Feb 2026 00:00:00 GMThttps://www.florian.bruniaux.com/blog/notes/portfolio-launch/https://www.florian.bruniaux.com/blog/notes/portfolio-launch/Portfolio v1.0 is live. It uses Astro (zero client-side JS) and Tailwind CSS. Features: - Dark and light theme toggle - GitHub stats integration (build-ti...Tue, 04 Feb 2025 00:00:00 GMT