ralph-loop

A command that starts a Ralph Loop, a repeated coding session that sends the same task back for another iteration after the assistant tries to stop.

In plain words
What is it for?
Use it for tasks that need repeated improvement. A completion statement may be given only when the work is genuinely finished.
Why use it?
It keeps work going across multiple passes while preserving progress in files and Git history.

Command for Claude Code

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/codecast-sh/codecast/ralph-loop
Clone the repo
git clone --depth 1 https://github.com/codecast-sh/codecast

Made for: Claude Code.

Per session 6 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 212 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 86% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00006 $0.00212
Opus 5 $0.00003 $0.00106
Sonnet 5 $0.00001 $0.00042
Haiku 4.5 $0.00001 $0.00021

Measured yesterday against content hash e15d5d0afe30, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ralph-loop scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

86% identical to ralph-loop — 13 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

packages/cli/src/capabilities/__fixtures__/manifests/home/.claude/plugins/cache/claude-plugins-official/ralph-loop/1.0.0/commands/ralph-loop.md · 19 lines

What it actually says

Ralph Loop Command

Execute the setup script to initialize the Ralph loop:

"${CLAUDE_PLUGIN_ROOT}/scripts/setup-ralph-loop.sh" $ARGUMENTS

Please work on the task. When you try to exit, the Ralph loop will feed the SAME PROMPT back to you for the next iteration. You'll see your previous work in files and git history, allowing you to iterate and improve.

CRITICAL RULE: If a completion promise is set, you may ONLY output it when the statement is completely and unequivocally TRUE. Do not output false promises to escape the loop, even if you think you're stuck or should exit for other reasons. The loop is designed to continue until genuine completion.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 19 lines · 6 tokens per session scan A e15d5d0afe30

Subscribe to this mod's changes

ralph-loop is a command published in the GitHub repository codecast-sh/codecast (30 stars, last pushed yesterday), licensed MIT. It adds 6 tokens to every session and 212 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. It is 86% identical to ralph-loop, differing in 13 lines, and is treated as a copy.