The fundamentals of Agentic Coding (AKA Vibe Coding) - Theodor René Carlsen - NDC Copenhagen 2026
The talk demystifies 'agentic coding' by establishing a fundamental baseline for understanding AI-assisted development tools. The core concept is that these systems rely on three components: the models (the brain), the harnesses (the ability to act), and the tools (specific functions). Speakers emphasize that while the ecosystem moves rapidly, understanding this architecture—especially the feedback loop where the harness executes actions based on model intentions—is crucial for practitioners. A key recommendation is maintaining control by favoring open-source, customizable systems over locked-down, proprietary solutions.
Key takeaways
-
The Three Pillars of AI Coding Tools
4:00
AI coding tools fundamentally consist of three parts: the models (e.g., GPTs from OpenAI, Claude from Anthropic), the harnesses, and the tools. The model is the 'brain,' but the harness allows it to perform actions beyond text generation.
-
Understanding Agent Functionality
5:10
Agents operate using a combination of a configurable system prompt (initial instructions) and defined tools. The model generates an *intention* (text), which the harness executes (e.g., reading files, running terminal commands). The output is then fed back into the model, creating a critical feedback loop.
-
The Importance of Openness and Control
11:10
While proprietary tools (like Cloud Code) are powerful, speakers caution against losing control. The ability to customize the harness is vital for a healthy ecosystem; open-source solutions allow introspection and customization.