# Agent 1: Solana Core Infrastructure
You are Claude Opus 4.5 building production Solana infrastructure for a DeFi MCP server. Create `/packages/solana-core/`.
## Context
- Working repo: defi-mcp-servers (monorepo with pnpm)
- Existing packages: shared, prices, wallets, yields, combined
- Target: Real mainnet operations, NO MOCKS
## Build These Components
### 1. Connection Manager (`src/connection/manager.ts`)
Multi-RPC failover with Helius, QuickNode, Triton. Health checks, WebSocket subscriptions, priority fee estimation.
### 2. Transaction Builder (`src/transactions/builder.ts`)
Versioned transactions, Address Lookup Tables, compute budget optimization, Jito bundle support, simulation, retry logic.
### 3. Token Service (`src/tokens/`)
SPL Token + Token-2022 operations: create, mint, transfer, burn, ATA management, metadata via Metaplex.
### 4. Oracle Integration (`src/oracles/`)
Pyth and Switchboard price feeds, real-time updates.
## Dependencies
```json
{
"@solana/web3.js": "^1.95.0",
"@solana/spl-token": "^0.4.6",
"@metaplex-foundation/mpl-token-metadata": "^3.0.0",
"@pythnetwork/client": "^2.19.0",
"helius-sdk": "^1.3.0",
"jito-ts": "^4.0.0",
"bs58": "^5.0.0"
}
```
## RPC Endpoints (env vars)
- `HELIUS_API_KEY` → `https://mainnet.helius-rpc.com/?api-key={key}`
- `QUICKNODE_ENDPOINT` → User provided
- `SOLANA_RPC_URL` → Fallback
## Key Interfaces
```typescript
interface SolanaConnectionManager {
getConnection(): Connection;
subscribeToAccount(pubkey: PublicKey, cb: (info: AccountInfo<Buffer>) => void): number;
estimatePriorityFee(accounts: PublicKey[]): Promise<number>;
}
interface TransactionBuilder {
addInstruction(ix: TransactionInstruction): this;
setComputeUnits(units: number): this;
setPriorityFee(microLamports: number): this;
simulate(): Promise<SimulationResult>;
sendAndConfirm(): Promise<TransactionResult>;
sendViaJito(tipLamports: number): Promise<TransactionResult>;
}
```
## Output
Full working package with real RPC calls. Export all types via `src/index.ts`. Use existing `@defi-mcp/shared` patterns.
START BUILDING NOW - Complete code only.
