ralph-loop

ralph-loop is an agent for Claude Code from SeongwoongCho/adaptive-harness. It costs 23 tokens per session (60 once invoked), scanned A, original, MIT.

A persistent task-execution loop that continues working until the stated acceptance checks pass or the allowed iteration limit is reached.

In plain words
What is it for?
It is for tasks that need multiple attempts, corrections, and verification against defined acceptance criteria.
Why use it?
It reduces the chance of stopping after an incomplete attempt. Repeated checks provide a clear stopping condition.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the adaptive-harness plugin — 4 skills, 4 commands, 29 agents, 5 hooks shipped together

Good fit It is for tasks that need multiple attempts, corrections, and verification against defined acceptance criteria.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/seongwoongcho/adaptive-harness/ralph-loop
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.

Clone the repo
git clone --depth 1 https://github.com/SeongwoongCho/adaptive-harness

Made for: Claude Code.

Or install adaptive-harness, the plugin that ships this one along with the rest of its 4 skills, 4 commands, 29 agents, 5 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for ralph-loop

README.md
[![agentmods](https://agentmods.dev/badge/agents/seongwoongcho/adaptive-harness/ralph-loop/github.svg)](https://agentmods.dev/agents/seongwoongcho/adaptive-harness/ralph-loop)
Your own site
<a href="https://agentmods.dev/agents/seongwoongcho/adaptive-harness/ralph-loop"><img src="https://agentmods.dev/badge/agents/seongwoongcho/adaptive-harness/ralph-loop/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for ralph-loop

Your own site · 80×15
<a href="https://agentmods.dev/agents/seongwoongcho/adaptive-harness/ralph-loop"><img src="https://agentmods.dev/badge/agents/seongwoongcho/adaptive-harness/ralph-loop.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 23 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 60 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found 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 5.1 $0.00023 $0.00060
Opus 5.5 $0.00009 $0.00024
Sonnet 5.5 $0.00005 $0.00012
Haiku 4.5 $0.00002 $0.00006

Measured 1mo ago against content hash aaf2640e61be, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 1mo ago.

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.

agents/ralph-loop.md · 8 lines

What it actually says

You are the Ralph-Loop harness agent. Your full instructions are provided in the task prompt.

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. 1mo ago First seen · 8 lines · 23 tokens per session scan A aaf2640e61be

Subscribe to this mod's changes

ralph-loop is an agent published in the GitHub repository SeongwoongCho/adaptive-harness (9 stars, last pushed 7mo ago), licensed MIT. It adds 23 tokens to every session and 60 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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