Writing about what building open source actually teaches me, and what we can all learn from it.https://johanneswachter.dev/enhttps://johanneswachter.dev/blog/symfony-ai-core-team/https://johanneswachter.dev/blog/symfony-ai-core-team/Chris Hertel asked me to join the new Symfony AI Core Team alongside Fabien Potencier and Oskar Stark. What that actually means to me.Thu, 13 Aug 2026 00:00:00 GMTaisymfonycareerhttps://johanneswachter.dev/blog/kill-the-mcp/https://johanneswachter.dev/blog/kill-the-mcp/I deleted the MCP server from a Mate prototype and kept the tools. What that cost, what it bought, and why the reflex is the thing worth killing.Tue, 04 Aug 2026 00:00:00 GMTaimcpphpsymfonyopinionhttps://johanneswachter.dev/blog/vibe-coding-without-a-custodian/https://johanneswachter.dev/blog/vibe-coding-without-a-custodian/Vibe coding can produce maintainable software. The harder question is who owns its dependencies, decisions and failures after launch.Tue, 28 Jul 2026 00:00:00 GMTaivibe-codingownershipmaintenanceopinionhttps://johanneswachter.dev/blog/the-wrong-debate/https://johanneswachter.dev/blog/the-wrong-debate/MCP or CLI is the wrong fight. What PHP with Composer, PSR and Symfony already learned about building things together, one layer down.Wed, 22 Jul 2026 00:00:00 GMTaimcpphpsymfonyopinionhttps://johanneswachter.dev/blog/the-last-mile/https://johanneswachter.dev/blog/the-last-mile/The polyfill that bridges where the Agent Skills standard is heading and what agents can read today, and why distribution, not the protocol, was the real problem.Thu, 09 Jul 2026 00:00:00 GMTaiskillssymfonymatemcphttps://johanneswachter.dev/blog/skills-over-mcp/https://johanneswachter.dev/blog/skills-over-mcp/What an Agent Skill actually is, how you serve one over MCP, and lessons from building a reference implementation against a spec that kept moving.Thu, 02 Jul 2026 00:00:00 GMTaimcpskillssymfonymatehttps://johanneswachter.dev/blog/when-implementation-becomes-free/https://johanneswachter.dev/blog/when-implementation-becomes-free/When code, design and content all get cheaper, maybe implementation was never the bottleneck. A note from the classroom on friction, the statistical mean, and where excellence shows up.Thu, 25 Jun 2026 00:00:00 GMTaiinnovationteachingopinionhttps://johanneswachter.dev/blog/giving-ai-assistants-eyes/https://johanneswachter.dev/blog/giving-ai-assistants-eyes/Highlights from the Symfony Mate Q&A: the dev-only MCP server that lets AI assistants look inside your running app, and why better context beats more context.Thu, 18 Jun 2026 00:00:00 GMTaisymfonymcpmatehttps://johanneswachter.dev/blog/why-six-people-are-enough/https://johanneswachter.dev/blog/why-six-people-are-enough/Six developers run Sulu, its enterprise projects and its cloud services. That only works because of ownership and context, and those are exactly what coding agents need too.Tue, 19 May 2026 00:00:00 GMTaiteamsownershipopinionsulu