I work on a shared project with many other developers in my organization. Its shared instructions added up to roughly 13,200 tokens, including workflows for Claude Code. My personal Codex harness uses about 670 tokens, a 95% reduction in instruction text, without changing everyone else’s setup. The shared guide could be trimmed too, but that’s for later. My personal harness has 2 parts: short instruction overrides and automatic worktree setup. Override the project instructions Codex loads AGENTS.override.md instead of AGENTS.md in the same directory. Global and parent-directory instructions still apply; an override doesn’t replace the whole chain. See the discovery...