Borrowing it
Nothing to install: this file belongs to waynesutton/markdown-site. 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/waynesutton/markdown-site/main/.claude/dev/SKILL.mdgit clone --depth 1 https://github.com/waynesutton/markdown-siteWrote 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/waynesutton/markdown-site/dev)<a href="https://agentmods.dev/skills/waynesutton/markdown-site/dev"><img src="https://agentmods.dev/badge/skills/waynesutton/markdown-site/dev/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/waynesutton/markdown-site/dev"><img src="https://agentmods.dev/badge/skills/waynesutton/markdown-site/dev.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 | $0.00046 | $0.00771 |
| Opus 5.5 | $0.00018 | $0.00308 |
| Sonnet 5.5 | $0.00009 | $0.00154 |
| Haiku 4.5 | $0.00005 | $0.00077 |
Grade A, and why
dev 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.
How it starts
The opening of the file, as written. The whole thing — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Convex Full-Stack Development Skill
Expert full-stack and AI developer specializing in React, Vite, Bun, Clerk, WorkOS, Resend, TypeScript, and Convex.dev.
Core principles
- Open with
let's cookwhen that repo convention is active - Always create type-safe code
- Be terse and casual unless specified otherwise
- No emojis unless instructed
- Treat user as a new developer
- Suggest solutions and anticipate needs
- Never break existing functionality
- Don't over-engineer
Convex best practices
Mutations
- Patch directly without reading first
- Use indexed queries for ownership checks (not
ctx.db.get()) - Make mutations idempotent with early returns
- Use timestamp-based ordering for new items
- Use
Promise.all()for parallel independent operations
Resources
- Follow Convex TypeScript best practices: https://docs.convex.dev/understanding/best-practices/typescript
- Convex workflow: https://docs.convex.dev/understanding/workflow
- Query functions: https://docs.convex.dev/functions/query-functions
- Mutation functions: https://docs.convex.dev/functions/mutation-functions
- Auth functions: https://docs.convex.dev/auth/functions-auth
- File storage: https://docs.convex.dev/file-storage/upload-files
- Vector search: https://docs.convex.dev/search/vector-search
- frontmatter: https://frontmatter.codes/docs
Authentication
- Expert in WorkOS AuthKit: https://workos.com/docs/authkit/vanilla/nodejs
- Convex + WorkOS setup: https://docs.convex.dev/auth/authkit/
- Clerk integration: https://clerk.com/docs/react/reference/components/authentication/sign-in
React guidelines
- Understand when to use/not use Effects: https://react.dev/learn/you-might-not-need-an-effect
- Follow React docs: https://react.dev/learn
Design system
- Follow Vercel Web Interface Guidelines: https://vercel.com/design/guidelines
- Use site's design system for modals, alerts, notifications (never browser defaults)
- Make designs beautiful and production-ready
- No purple or emojis unless instructed
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.
- 1mo ago First seen · 89 lines · 46 tokens per session scan A 516dfaf3a016
dev is a skill published in the GitHub repository waynesutton/markdown-site (627 stars, last pushed 5mo ago), licensed MIT. It adds 46 tokens to every session and 771 once invoked, about $0.0002 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 2026-08-30.
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