diff --git a/package.json b/package.json
index cfa4212..821206d 100644
--- a/package.json
+++ b/package.json
@@ -1,65 +1,36 @@
 {
-  "name": "@apexfusion/mcp-server",
+  "name": "@apexfusion/mcp-server-monorepo",
   "version": "0.1.0",
-  "main": "index.js",
+  "private": true,
   "type": "module",
-  "bin": {
-    "mcp-server": "./build/index.js"
-  },
+  "workspaces": ["packages/*"],
   "scripts": {
     "postinstall": "ln -sf ../../../libsodium-sumo/dist/modules-sumo-esm/libsodium-sumo.mjs node_modules/libsodium-wrappers-sumo/dist/modules-sumo-esm/libsodium-sumo.mjs 2>/dev/null || true",
-    "clean": "rm -rf build",
-    "build": "tsup && chmod +x build/index.js",
-    "typecheck": "tsc --noEmit --incremental",
-    "start": "node build/index.js",
+    "clean": "rm -rf packages/*/build",
+    "build": "npm run build --workspace=@apexfusion/vector-mcp-builder",
+    "typecheck": "tsc --noEmit -p packages/shared && tsc --noEmit -p packages/builder",
+    "start": "node packages/builder/build/index.js",
     "test": "npm run test:unit",
-    "test:unit": "node --import tsx --test test/unit/*.test.ts",
-    "test:integration": "npm run build && node --import tsx --test test/integration/*.test.ts",
-    "test:smoke": "npm run build && node --import tsx --test test/smoke/*.test.ts"
-  },
-  "files": [
-    "build"
-  ],
-  "keywords": [
-    "vector",
-    "mcp",
-    "blockchain",
-    "cardano",
-    "apex-fusion",
-    "ai-agent",
-    "utxo"
-  ],
-  "author": "Apex Fusion",
-  "license": "ISC",
-  "description": "MCP server for Vector - AI agent interface for the Apex Fusion eUTXO L2",
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/Apex-Fusion/mcp-server.git"
-  },
-  "homepage": "https://apex-fusion.github.io/vector-ai-documentation/",
-  "bugs": {
-    "url": "https://github.com/Apex-Fusion/mcp-server/issues"
-  },
-  "engines": {
-    "node": ">=14.0.0"
-  },
-  "private": false,
-  "publishConfig": {
-    "registry": "https://registry.npmjs.org/"
-  },
-  "dependencies": {
-    "@aws-sdk/client-s3": "^3.1027.0",
-    "@lucid-evolution/lucid": "^0.4.29",
-    "@modelcontextprotocol/sdk": "^1.4.1",
-    "@noble/hashes": "^1.7.1",
-    "cross-fetch": "^4.0.0",
-    "dotenv": "^16.4.5",
-    "zod": "^3.24.1"
+    "test:unit": "node --import tsx --test packages/*/test/*.test.ts",
+    "test:smoke": "npm run build && node --import tsx --test packages/builder/test/smoke/*.test.ts",
+    "test:integration": "npm run build && node --import tsx --test packages/builder/test/integration/*.test.ts"
   },
   "devDependencies": {
     "@types/node": "^22.13.1",
     "tsup": "^8.5.1",
     "tsx": "^4.21.0",
     "typescript": "^5.7.3"
+  },
+  "engines": {
+    "node": ">=22.0.0"
+  },
+  "license": "ISC",
+  "author": "Apex Fusion",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/Apex-Fusion/mcp-server.git"
+  },
+  "bugs": {
+    "url": "https://github.com/Apex-Fusion/mcp-server/issues"
   }
 }
diff --git a/packages/shared/package.json b/packages/shared/package.json
new file mode 100644
index 0000000..7ba6eaf
--- /dev/null
+++ b/packages/shared/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "@apexfusion/vector-mcp-shared",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "exports": {
+    "./tx": "./src/tx.ts",
+    "./types": "./src/types.ts",
+    "./config": "./src/config.ts",
+    "./provider": "./src/provider.ts"
+  },
+  "dependencies": {
+    "@lucid-evolution/lucid": "^0.4.29",
+    "@noble/hashes": "^1.7.1",
+    "cross-fetch": "^4.0.0"
+  }
+}
diff --git a/packages/shared/src/config.ts b/packages/shared/src/config.ts
new file mode 100644
index 0000000..7ccd5fe
--- /dev/null
+++ b/packages/shared/src/config.ts
@@ -0,0 +1,9 @@
+// Vector network endpoints. Defaults target testnet; override via environment.
+export const VECTOR_OGMIOS_URL = process.env.VECTOR_OGMIOS_URL || 'https://ogmios.vector.testnet.apexfusion.org';
+export const VECTOR_SUBMIT_URL = process.env.VECTOR_SUBMIT_URL || 'https://submit.vector.testnet.apexfusion.org/api/submit/tx';
+export const VECTOR_KOIOS_URL = process.env.VECTOR_KOIOS_URL || 'https://koios.vector.testnet.apexfusion.org/';
+export const VECTOR_EXPLORER_URL = process.env.VECTOR_EXPLORER_URL || 'https://vector.testnet.apexscan.org';
+
+export function explorerTxLink(txHash: string): string {
+  return `${VECTOR_EXPLORER_URL}/transaction/${txHash}`;
+}
diff --git a/src/vector/ogmios-provider.ts b/packages/shared/src/provider.ts
similarity index 100%
rename from src/vector/ogmios-provider.ts
rename to packages/shared/src/provider.ts
diff --git a/packages/shared/src/tx.ts b/packages/shared/src/tx.ts
new file mode 100644
index 0000000..4eeb82d
--- /dev/null
+++ b/packages/shared/src/tx.ts
@@ -0,0 +1,71 @@
+// Pure transaction helpers. No network access — this module is safe to import
+// from the signer, which must have no network capability.
+import { blake2b } from '@noble/hashes/blake2b';
+
+export function lovelaceToAda(lovelace: string | number | bigint): string {
+  if (lovelace === undefined || lovelace === null) return '0.000000';
+  try {
+    return (Number(BigInt(String(lovelace))) / 1_000_000).toFixed(6);
+  } catch {
+    return '0.000000';
+  }
+}
+
+export function formatAssetName(name: string): string {
+  try {
+    if (/^[0-9a-fA-F]+$/.test(name) && name.length > 0) {
+      return Buffer.from(name, 'hex').toString('utf8');
+    }
+    return name;
+  } catch {
+    return name;
+  }
+}
+
+// Cardano metadata strings must be <= 64 bytes. Chunk long strings into arrays.
+export function metadataStr(s: string): string | string[] {
+  if (s.length <= 64) return s;
+  const chunks: string[] = [];
+  for (let i = 0; i < s.length; i += 64) {
+    chunks.push(s.slice(i, i + 64));
+  }
+  return chunks;
+}
+
+export function cborUint(n: bigint): Buffer {
+  if (n < 0n) throw new Error('output_index must be non-negative');
+  if (n < 24n) return Buffer.from([Number(n)]);
+  if (n < 0x100n) return Buffer.from([0x18, Number(n)]);
+  if (n < 0x10000n) return Buffer.from([0x19, Number(n >> 8n) & 0xff, Number(n) & 0xff]);
+  if (n < 0x100000000n) {
+    const b = Buffer.alloc(5); b[0] = 0x1a; b.writeUInt32BE(Number(n), 1); return b;
+  }
+  const b = Buffer.alloc(9); b[0] = 0x1b; b.writeBigUInt64BE(n, 1); return b;
+}
+
+export function cborBytes(hex: string): Buffer {
+  const raw = Buffer.from(hex, 'hex');
+  const len = raw.length;
+  let header: Buffer;
+  if (len < 24) header = Buffer.from([0x40 | len]);
+  else if (len < 0x100) header = Buffer.from([0x58, len]);
+  else if (len < 0x10000) { header = Buffer.alloc(3); header[0] = 0x59; header.writeUInt16BE(len, 1); }
+  else { header = Buffer.alloc(5); header[0] = 0x5a; header.writeUInt32BE(len, 1); }
+  return Buffer.concat([header, raw]);
+}
+
+// NFT asset name = blake2b_256(CBOR(OutputReference)).
+// agent-registry v2 (Conway) requires INDEFINITE-length CBOR for the constructor
+// field array (D8 79 9F … FF), matching Aiken's cbor.serialise. Lucid's Data.to
+// emits definite-length arrays (D8 79 82 …) which v2 rejects, so the outer
+// constructor is hand-rolled here.
+export function deriveNftAssetName(txHash: string, outputIndex: number): string {
+  const outRefCbor = Buffer.concat([
+    Buffer.from([0xd8, 0x79, 0x9f]),
+    cborBytes(txHash),
+    cborUint(BigInt(outputIndex)),
+    Buffer.from([0xff]),
+  ]);
+  const hashBytes = blake2b(outRefCbor, { dkLen: 32 });
+  return Buffer.from(hashBytes).toString('hex');
+}
diff --git a/src/vector/types.ts b/packages/shared/src/types.ts
similarity index 100%
rename from src/vector/types.ts
rename to packages/shared/src/types.ts
diff --git a/packages/shared/test/tx.test.ts b/packages/shared/test/tx.test.ts
new file mode 100644
index 0000000..fe61fff
--- /dev/null
+++ b/packages/shared/test/tx.test.ts
@@ -0,0 +1,41 @@
+import { describe, test } from 'node:test';
+import assert from 'node:assert/strict';
+import { deriveNftAssetName, lovelaceToAda, formatAssetName, metadataStr } from '../src/tx.ts';
+
+const VECTORS: Array<{ tx: string; idx: number; expected: string }> = [
+  { tx: '00'.repeat(32), idx: 0, expected: 'a2e5e227858e84f1a8f9b0c1246e6cbc9336d707d43ba43d0e1cb7c51c45f4c9' },
+  { tx: '2703182e4d1151a32b7bcfc2362c91278bcac66a49a840d217ae5cb49f8b3649', idx: 0, expected: '24ed834d88890ce35e81a6b9c4f988fad3d8a0284db6f3e641416f44f5e95d75' },
+  { tx: 'ff'.repeat(32), idx: 23, expected: 'df229a221c5a84f48c06d5b28a98deb6ea678c369ab166400e88dd3d2bdc7b9f' },
+  { tx: 'ab'.repeat(32), idx: 24, expected: '3ddd07517205dd8a745887c33a09da0e4a5d63dca1f151ceeedaeeda0551c52b' },
+  { tx: '01'.repeat(32), idx: 256, expected: 'e626a305779e4c1e74b7719d302d0fbc1b722ab33bd52da4c23e6b8cd1bd04ec' },
+];
+
+describe('deriveNftAssetName — Conway indefinite-CBOR parity', () => {
+  for (const { tx, idx, expected } of VECTORS) {
+    test(`tx=${tx.slice(0, 8)}… idx=${idx}`, () => {
+      assert.equal(deriveNftAssetName(tx, idx), expected);
+    });
+  }
+});
+
+describe('lovelaceToAda', () => {
+  test('converts whole ada', () => assert.equal(lovelaceToAda(2_000_000n), '2.000000'));
+  test('converts fractional ada', () => assert.equal(lovelaceToAda('1234567'), '1.234567'));
+  test('returns zero for null', () => assert.equal(lovelaceToAda(null as unknown as bigint), '0.000000'));
+  test('returns zero for garbage', () => assert.equal(lovelaceToAda('not-a-number'), '0.000000'));
+});
+
+describe('formatAssetName', () => {
+  test('decodes hex to utf8', () => assert.equal(formatAssetName('74657374'), 'test'));
+  test('passes through non-hex unchanged', () => assert.equal(formatAssetName('plain'), 'plain'));
+  test('passes through empty string', () => assert.equal(formatAssetName(''), ''));
+});
+
+describe('metadataStr', () => {
+  test('leaves short strings intact', () => assert.equal(metadataStr('short'), 'short'));
+  test('chunks strings longer than 64 bytes', () => {
+    const out = metadataStr('a'.repeat(150));
+    assert.ok(Array.isArray(out));
+    assert.deepEqual((out as string[]).map(s => s.length), [64, 64, 22]);
+  });
+});
diff --git a/packages/shared/tsconfig.json b/packages/shared/tsconfig.json
new file mode 100644
index 0000000..d9485a5
--- /dev/null
+++ b/packages/shared/tsconfig.json
@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "es2020",
+    "module": "es2020",
+    "moduleResolution": "node",
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "noEmit": true,
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true
+  },
+  "include": ["src/**/*", "test/**/*"]
+}