This repository is a comprehensive operational playbook for 'Ralph', Geoff Huntley's methodology for running Claude Code in an autonomous loop to build software. The core deliverable is a detailed guide (README.md plus a styled index.html mirror) explaining the three-phase workflow: define requirements as JTBD-aligned specs, generate an implementation plan via a planning loop, then run a building loop where Claude picks tasks from the plan, implements them, validates against tests, and commits — with a fresh context window per iteration. The guide is unusually well-structured, covering context management, backpressure via tests, sandbox security, and tuning strategies. Beyond documentation, the repo ships functional artifacts: two bash loop scripts (files/loop.sh, files/loop_streamed.sh) that orchestrate the Claude CLI, a dependency-free Node.js stream parser (files/parse_stream.js) for readable terminal output, and five prompt templates (PROMPT_build.md, PROMPT_plan.md, PROMPT_specs.md, PROMPT_reverse_engineer_specs.md) encoding the methodology's guardrails. It also documents sandbox environment options (E2B, Fly Sprites, Modal, Cloudflare, Docker) for safely running autonomous agents with --dangerously-skip-permissions. The prompt templates are the real product — they encode hard-won operational knowledge about context efficiency, subagent fan-out, and steering LLM behavior. Notable patterns include escalating 9s-numbered guardrails, explicit subagent limits (500 for search, 1 for build/tests), the 'one sentence without and' topic scoping test, and a two-phase reverse-engineering prompt that produces implementation-free behavioral specs. This is a documentation-first repo with a small but functional code footprint.