┌─────────────────────────────────────────────────────────────┐
│                      Your Application                        │
├─────────────────────────────────────────────────────────────┤
│  Base Layer (Solana)          │  Ephemeral Rollup (ER)      │
│  - Initialize accounts        │  - Execute operations       │
│  - Delegate accounts          │  - Process at ~10-50ms      │
│  - Final state commits        │  - Zero gas fees            │
│  - ~400ms finality            │  - Commit state to Solana   │
└─────────────────────────────────────────────────────────────┘

# Required versions
Solana: 2.3.13
Rust: 1.85.0
Anchor: 0.32.1
Node: 24.10.0

# Install Anchor (if needed)
cargo install --git https://github.com/coral-xyz/anchor anchor-cli

[dependencies]
anchor-lang = "0.32.1"
ephemeral-rollups-sdk = { version = "0.6.5", features = ["anchor", "disable-realloc"] }

use anchor_lang::prelude::*;
use ephemeral_rollups_sdk::anchor::{delegate_account, commit_accounts, ephemeral};
use ephemeral_rollups_sdk::cpi::DelegationProgram;

declare_id!("YourProgramId111111111111111111111111111111");

#[ephemeral]  // Required: enables ER support
#[program]
pub mod my_program {
    use super::*;

    pub fn initialize(ctx: Context<Initialize>) -> Result<()> {
        ctx.accounts.state.value = 0;
        Ok(())
    }

    #[delegate]  // Auto-injects delegation accounts
    pub fn delegate(ctx: Context<Delegate>) -> Result<()> {
        Ok(())
    }

    pub fn increment(ctx: Context<Update>) -> Result<()> {
        ctx.accounts.state.value += 1;
        Ok(())
    }

    #[commit]  // Auto-injects commit accounts
    pub fn undelegate(ctx: Context<Undelegate>) -> Result<()> {
        Ok(())
    }
}

import { Connection, PublicKey } from "@solana/web3.js";
import { AnchorProvider, Program } from "@coral-xyz/anchor";
import { DELEGATION_PROGRAM_ID } from "@magicblock-labs/ephemeral-rollups-sdk";

// CRITICAL: Separate connections for each layer
const baseConnection = new Connection("https://api.devnet.solana.com");
const erConnection = new Connection("https://devnet.magicblock.app");

// Create providers
const baseProvider = new AnchorProvider(baseConnection, wallet, { commitment: "confirmed" });
const erProvider = new AnchorProvider(erConnection, wallet, {
  commitment: "confirmed",
  skipPreflight: true,  // Required for ER
});

// Check delegation status
async function isDelegated(pubkey: PublicKey): Promise<boolean> {
  const info = await baseConnection.getAccountInfo(pubkey);
  return info?.owner.equals(DELEGATION_PROGRAM_ID) ?? false;
}

#[derive(Accounts)]
pub struct Delegate<'info> {
    #[account(mut)]
    pub payer: Signer<'info>,
    /// CHECK: Will be delegated
    #[account(mut, del)]  // 'del' marks for delegation
    pub state: AccountInfo<'info>,
    pub delegation_program: Program<'info, DelegationProgram>,
}

use ephemeral_rollups_sdk::anchor::commit_accounts;

pub fn commit(ctx: Context<Commit>) -> Result<()> {
    commit_accounts(
        &ctx.accounts.payer,
        vec![&ctx.accounts.state.to_account_info()],
        &ctx.accounts.magic_context,
        &ctx.accounts.magic_program,
    )?;
    Ok(())
}

#[commit]  // Handles commit + undelegate
pub fn undelegate(ctx: Context<Undelegate>) -> Result<()> {
    Ok(())
}

import { requestRandomness, getRandomnessResult } from "@magicblock-labs/vrf-sdk";

// Request randomness
const requestTx = await requestRandomness({
  payer: wallet.publicKey,
  seed: Buffer.from("my_game_seed"),
});

// Get result after confirmation
const result = await getRandomnessResult(requestId);
console.log("Random value:", result.randomness);

magicblock/
├── SKILL.md                          # This file
├── resources/
│   ├── api-reference.md              # Complete API reference
│   └── program-ids.md                # All program IDs and constants
├── examples/
│   ├── anchor-counter/README.md      # Basic counter with delegation
│   ├── delegation-flow/README.md     # Full delegation lifecycle
│   ├── vrf-randomness/README.md      # VRF integration
│   └── crank-automation/README.md    # Scheduled tasks
├── templates/
│   ├── program-template.rs           # Rust program starter
│   └── client-template.ts            # TypeScript client starter
└── docs/
    ├── advanced-patterns.md          # Complex patterns
    └── troubleshooting.md            # Common issues