base/skills — reverse-engineered prompt

Build me a Base Skills repo that I can install with npx skills add base/skills and use inside an AI coding assistant.

I want it to teach the assistant how to help people build on Base without needing to explain everything from scratch. It should include a main Base development skill for common tasks like connecting to Base mainnet and Sepolia, deploying smart contracts, adding wallet login, payments, builder attribution, and migrating an existing app to Base. It should also include a Base MCP skill that helps an assistant use a wallet through mcp.base.org for things like checking balances, sending, swapping, signing, and batched calls.

Please make the README clear for beginners, with install instructions, short examples, links to Base docs, and a simple contributing section. Keep the skill docs organized so the assistant can load only what it needs. Look up current Base and Skills CLI docs online if you need to.