Sebastian Raschka • 4/4/2026

Components of A Coding Agent

This article by Sebastian Raschka explores the design and components of coding agents and agent harnesses, explaining how they leverage tools, memory, and repository context to improve LLM effectiveness in real-world coding tasks. It contrasts LLMs, reasoning models, and agents, highlighting that recent progress in practical LLM systems often stems from the surrounding system rather than just model improvements. The piece references tools like Claude Code and Codex CLI, and outlines six main building blocks of a coding agent, making it a valuable reference for those interested in agentic coding systems.

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#llm #Tool Use #Context Management