ralph-loop
Start a Ralph Loop for iterative self-referential development. Use when the user asks to run a ralph loop, start an iterative loop, or wants repeated autonomous iteration on a task until completion.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/cursor/plugins --skill ralph-loop- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads ralph-loop automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Ralph Loop
Trigger
The user wants to start a Ralph loop. An iterative development loop where the same prompt is fed back after every turn, and the agent sees its own previous work each iteration.
Workflow
-
Gather the user's task prompt and optional parameters:
max_iterations(number, default 0 for unlimited)completion_promise(text, or "null" if not set)
-
Create the directory
.cursor/ralph/if it doesn't exist, then write the state file at.cursor/ralph/scratchpad.mdwith this exact format:--- iteration: 1 max_iterations: <N or 0> completion_promise: "<TEXT>" or null --- <the user's task prompt goes here>Example:
--- iteration: 1 max_iterations: 20 completion_promise: "COMPLETE" --- Build a REST API for todos with CRUD operations, input validation, and tests. -
Confirm to the user that the Ralph loop is active, then begin working on the task.
-
The stop hook automatically intercepts each turn end and feeds the same prompt back as a followup message. You will see it prefixed with
[Ralph loop iteration N.].
Guardrails
- If a completion promise is set, you may ONLY output
<promise>TEXT</promise>when the statement is completely and genuinely true. - Do not output false promises to escape the loop.
- Always recommend setting
max_iterationsas a safety net. - Quote the
completion_promisevalue in the YAML frontmatter if it contains special characters.
Output
Confirm the loop is active (prompt, iteration limit, promise if set), then start working on the task immediately.
FAQ
What does the ralph-loop skill do?
Start a Ralph Loop for iterative self-referential development. Use when the user asks to run a ralph loop, start an iterative loop, or wants repeated autonomous iteration on a task until completion.
How do I install ralph-loop?
Run npx skills add https://github.com/cursor/plugins --skill ralph-loop in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/ralph-loop/ (personal) or .claude/skills/ralph-loop/ (project).
Which AI agents can use ralph-loop?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is ralph-loop safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains ralph-loop?
It is published by cursor in cursor/plugins. It has 1,017 recorded installs.
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