Beautiful file previews for AI coding agents. Turn your AI agent's file changes into shareable, beautifully rendered web pages — encrypted end-to-end.

1. Encrypt locally — diffs and files are encrypted with AES-256-GCM on your machine before upload. The server never sees plaintext.
2. Share a link — get a URL like diff4.com/p/abc123. Recipients need the passphrase to decrypt.
3. Auto-expiry — all content expires after 24 hours.

Copy this prompt to your agent (OpenClaw, Hermes Agent, etc)

Referencing https://diff4.com/docs/cli, help me write a skill that uses diff4.

# Install the CLI
npm install -g @diff4/cli

# Or use with AI agents
npx skills add djyde/diff4

# Set up encryption key (first time only)
diff4 key-gen
source ~/.zshrc   # or ~/.bashrc

# Share your latest commit diff
diff4 git-latest

# Share staged changes
diff4 git-staged

# Share arbitrary files
diff4 files src/foo.ts src/bar.ts

All upload commands accept -s, --server <url> and -p, --passphrase <key> flags.

• AES-256-GCM encryption
• PBKDF2-SHA256 key derivation with 600,000 iterations
• Client-side encryption only — the server stores ciphertext
• Passphrase shared out-of-band by you

# Start PostgreSQL
docker compose up -d

# Set up the server
cd packages/server
pnpm install
pnpm db:generate
pnpm db:push

# Configure .env
# DATABASE_URL=postgresql://postgres:postgres@localhost:59876/render4
# NEXT_PUBLIC_BASE_URL=http://localhost:3000

pnpm dev

# Set environment variable
export DIFF4_SERVER=https://your-server.com

# Or use the flag
diff4 git-latest -s https://your-server.com

• Server — Next.js 16, PostgreSQL 16, Prisma, Tailwind CSS v4
• CLI — Bun, Commander.js, builds to standalone binaries
• Docs — fumadocs with MDX

packages/server/   Next.js app (pnpm)
packages/cli/      CLI tool @diff4/cli (Bun)
skills/diff4/      OpenCode skill definition

Git tags (v*) trigger .github/workflows/release.yml which builds CLI binaries and attaches them to a GitHub Release.

Made by Randy Lu