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.
npx skills add mischasigtermans/claude-ralph --skill ralphgit clone --depth 1 https://github.com/mischasigtermans/claude-ralphWrote 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.
[](https://agentmods.dev/skills/mischasigtermans/claude-ralph/ralph)<a href="https://agentmods.dev/skills/mischasigtermans/claude-ralph/ralph"><img src="https://agentmods.dev/badge/skills/mischasigtermans/claude-ralph/ralph/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.
<a href="https://agentmods.dev/skills/mischasigtermans/claude-ralph/ralph"><img src="https://agentmods.dev/badge/skills/mischasigtermans/claude-ralph/ralph.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00079 | $0.02686 |
| Opus 5 | $0.00039 | $0.01343 |
| Sonnet 5 | $0.00016 | $0.00537 |
| Haiku 4.5 | $0.00008 | $0.00269 |
Grade A, and why
ralph 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 262 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ralph Skill (v2)
Your job in this skill is to scope Ralph's autonomous coding loop. Write a prose brief that survives across every loop iteration, draft the story list, and decide how often the loop's planner agent should review progress. Then exit. The user runs ralph separately.
CRITICAL: NEVER start implementing within this session. After setup is complete, tell the user to run ralph from a terminal.
The brief is the contract
The single most important thing you produce is .ralph/brief.md. It is prose, not bullets. Each loop iteration loads it as the plan-time context. The builder agent reads it before picking a story; the planner agent treats it as read-only ground truth.
Steve Jobs's exit criterion: if you cannot describe the work in two paragraphs, the planning isn't done yet. If you find yourself writing a four-page brief, you don't understand the scope well enough. Go back and ask one more question, or push back to narrow the work.
Step 1: Discover context (silent, no questions yet)
Before asking the user anything, do this on your own:
- Read
CLAUDE.mdif it exists in the project root. Note any conventions, patterns, or external context sources mentioned (issue trackers, spec dirs, dashboards, design docs). - Read any context files referenced by CLAUDE.md that look directly relevant to the user's request.
- If a referenced source is reachable via an MCP server loaded in this session (Linear, GitHub, Notion, Sentry, etc.), and the user's job description references something matching it (e.g. "PROJ-123" when CLAUDE.md mentions Linear team PROJ), fetch the relevant items quietly. If no MCP for the source is loaded, skip. Don't ask the user to set one up.
- Briefly explore the codebase structure (top-level dirs, package manager, framework signals) so you can write a brief that uses the project's own vocabulary.
If .ralph/ already exists, check what's there before proceeding (see "Existing .ralph/" below).
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.
- 8d ago First seen · 262 lines · 79 tokens per session scan A 5837ff157dc6
ralph is a skill published in the GitHub repository mischasigtermans/claude-ralph (1 stars, last pushed 3mo ago), licensed MIT. It adds 79 tokens to every session and 2,686 once invoked, about $0.0004 per session on Opus 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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