Borrowing it
Nothing to install: this file belongs to popmechanic/VibesOS. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/popmechanic/VibesOS/main/CLAUDE.mdgit clone --depth 1 https://github.com/popmechanic/VibesOSWrote 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/instructions/popmechanic/vibesos/claude-md)<a href="https://agentmods.dev/instructions/popmechanic/vibesos/claude-md"><img src="https://agentmods.dev/badge/instructions/popmechanic/vibesos/claude-md/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/instructions/popmechanic/vibesos/claude-md"><img src="https://agentmods.dev/badge/instructions/popmechanic/vibesos/claude-md.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 | $0.02855 | $0.02855 |
| Opus 5 | $0.01427 | $0.01427 |
| Sonnet 5 | $0.00571 | $0.00571 |
| Haiku 4.5 | $0.00285 | $0.00285 |
Grade A, and why
VibesOS CLAUDE.md 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 9d 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 — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Vibes DIY Plugin - Development Guide
Agent Quick Reference
When to Read What
| Task | Read First |
|---|---|
| Working on skills | The specific skills/*/SKILL.md file |
| Generating app code | SKILL.md has TinyBase patterns and common hooks |
| Working on scripts | scripts/package.json for deps |
| Debugging React errors | .claude/rules/react-singleton.md loads automatically; also skills/vibes/SKILL.md Common Mistakes |
| Deploying to Cloudflare | skills/cloudflare/SKILL.md |
| Testing plugin changes | cd scripts && npm test for all tests; /vibes:test for full E2E |
| Editing auth components | .claude/rules/auth-components.md loads automatically |
| Editing templates or build system | .claude/rules/template-build.md loads automatically |
| Working on sharing/invites | .claude/rules/sharing-architecture.md loads automatically |
| Working on generate/chat/theme server flow | See "Generate Flow Routing" below before editing handlers/ |
TinyBase API Reference
SKILL.md provides common patterns (useTable, useRow, useAddRowCallback, store.setRow/delRow) and critical gotchas.
TinyBase hooks are exposed as window.* globals in the template (useTable, useRow, useCell, useRowIds, useSortedRowIds, useAddRowCallback, etc.). The useApp() hook provides { isReady, isSyncing, user } context.
Environment Variables in SKILL.md
CLAUDE_PLUGIN_ROOT is set by plugin runtime but may be missing in dev mode (claude --plugin .). CLAUDE_SKILL_DIR is text-substituted before the agent sees the markdown — always reliable.
All SKILL.md bash blocks use the fallback pattern:
VIBES_ROOT="${CLAUDE_PLUGIN_ROOT:-$(dirname "$(dirname "${CLAUDE_SKILL_DIR}")")}"
CLAUDE_SKILL_DIR is <plugin-root>/skills/<name>/, so dirname dirname gives the plugin root.
Critical Rules
?external= for React Singleton
Any esm.sh package that depends on React MUST use ?external=react,react-dom. Details in .claude/rules/react-singleton.md (loads automatically when editing templates).
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.
- 9d ago First seen · 222 lines · 2,855 tokens per session scan A f89ce137d946
VibesOS CLAUDE.md is an instructions file published in the GitHub repository popmechanic/VibesOS (133 stars, last pushed 1mo ago), licensed MIT. It adds 2,855 tokens to every session, about $0.0143 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 2026-08-30.
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