diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a73e77d2..5e5effda 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,6 +55,41 @@ jobs:
       - name: TTY smoke tests
         run: bun run test:tty-smoke
 
+  pack-npm:
+    name: Verify npm package
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: 1.3.10
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Build npm runtime bundle
+        run: bun run build:npm
+
+      - name: Verify npm pack output
+        run: bun run check:pack
+
+      - name: Simulate global npm install
+        run: |
+          pkg_dir="$(mktemp -d)"
+          install_dir="$(mktemp -d)"
+          npm pack --pack-destination "$pkg_dir" >/dev/null
+          pkg="$(find "$pkg_dir" -maxdepth 1 -name 'hunkdiff-*.tgz' | head -n1)"
+          npm install -g --prefix "$install_dir" "$pkg"
+          PATH="$install_dir/bin:$PATH" hunk --help | grep 'Usage: hunk'
+
   build-bin:
     name: Build compiled binary
     runs-on: ubuntu-latest
diff --git a/package.json b/package.json
index 95668d62..4131a53e 100644
--- a/package.json
+++ b/package.json
@@ -1,25 +1,56 @@
 {
-  "name": "hunk",
+  "name": "hunkdiff",
   "version": "0.1.0",
-  "description": "Desktop-inspired terminal diff viewer for agent-authored changesets.",
-  "module": "src/main.tsx",
+  "description": "Desktop-inspired terminal diff viewer for understanding agent-authored changesets.",
   "type": "module",
-  "private": true,
+  "packageManager": "bun@1.3.10",
   "bin": {
-    "hunk": "./src/main.tsx"
+    "hunk": "dist/npm/main.js"
   },
+  "files": [
+    "dist/npm",
+    "README.md",
+    "LICENSE",
+    "CONTRIBUTING.md",
+    "SECURITY.md"
+  ],
   "scripts": {
     "start": "bun run src/main.tsx",
     "dev": "bun --watch src/main.tsx",
+    "build:npm": "bash ./scripts/build-npm.sh",
     "build:bin": "bash ./scripts/build-bin.sh",
     "install:bin": "bash ./scripts/install-bin.sh",
     "typecheck": "tsc --noEmit",
     "test": "bun test",
     "test:tty-smoke": "bun test test/tty-render-smoke.test.ts",
+    "check:pack": "bun run ./scripts/check-pack.ts",
+    "prepack": "bun run build:npm",
     "bench:bootstrap-load": "bun run test/bootstrap-load-benchmark.ts",
     "bench:highlight-prefetch": "bun run test/adjacent-highlight-prefetch-benchmark.ts",
     "bench:large-stream": "bun run test/large-stream-windowing-benchmark.ts"
   },
+  "keywords": [
+    "diff",
+    "git",
+    "tui",
+    "terminal",
+    "code-review",
+    "ai"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/modem-dev/hunk.git"
+  },
+  "homepage": "https://github.com/modem-dev/hunk#readme",
+  "bugs": {
+    "url": "https://github.com/modem-dev/hunk/issues"
+  },
+  "engines": {
+    "bun": ">=1.3.10"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
   "devDependencies": {
     "@types/bun": "latest",
     "@types/react": "^19.2.14",
diff --git a/scripts/build-npm.sh b/scripts/build-npm.sh
new file mode 100644
index 00000000..bb962b11
--- /dev/null
+++ b/scripts/build-npm.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+outdir="${repo_root}/dist/npm"
+
+rm -rf "${outdir}"
+mkdir -p "${outdir}"
+
+BUN_TMPDIR="${repo_root}/.bun-tmp" \
+BUN_INSTALL="${repo_root}/.bun-install" \
+  bun build "${repo_root}/src/main.tsx" \
+    --target bun \
+    --format esm \
+    --outdir "${outdir}" \
+    --entry-naming main.js
+
+chmod 0755 "${outdir}/main.js"
+
+printf 'Built %s\n' "${outdir}/main.js"
diff --git a/scripts/check-pack.ts b/scripts/check-pack.ts
new file mode 100644
index 00000000..4e0ea292
--- /dev/null
+++ b/scripts/check-pack.ts
@@ -0,0 +1,76 @@
+#!/usr/bin/env bun
+
+import { existsSync } from "node:fs";
+
+interface PackedFile {
+  path: string;
+  size: number;
+}
+
+interface PackResult {
+  name: string;
+  version: string;
+  filename: string;
+  entryCount: number;
+  files: PackedFile[];
+}
+
+const proc = Bun.spawnSync(["npm", "pack", "--dry-run", "--json"], {
+  cwd: process.cwd(),
+  stdin: "ignore",
+  stdout: "pipe",
+  stderr: "pipe",
+  env: process.env,
+});
+
+const stdout = Buffer.from(proc.stdout).toString("utf8").trim();
+const stderr = Buffer.from(proc.stderr).toString("utf8").trim();
+
+if (proc.exitCode !== 0) {
+  throw new Error(stderr || stdout || "npm pack --dry-run failed");
+}
+
+const jsonMatch = stdout.match(/(\[\s*\{[\s\S]*\}\s*\])\s*$/);
+const jsonText = jsonMatch?.[1];
+
+if (!jsonText) {
+  throw new Error(`Could not find npm pack JSON output. Full stdout:\n${stdout}`);
+}
+
+const parsed = JSON.parse(jsonText) as PackResult[];
+const pack = parsed[0];
+
+if (!pack) {
+  throw new Error("npm pack --dry-run returned no pack result.");
+}
+
+const publishedPaths = new Set(pack.files.map((file) => file.path));
+const requiredPaths = ["dist/npm/main.js", "README.md", "LICENSE", "package.json"];
+const optionalPaths = ["CONTRIBUTING.md", "SECURITY.md"];
+
+for (const path of requiredPaths) {
+  if (!publishedPaths.has(path)) {
+    throw new Error(`Expected npm package to include ${path}.`);
+  }
+}
+
+for (const path of optionalPaths) {
+  if (existsSync(path) && !publishedPaths.has(path)) {
+    throw new Error(`Expected npm package to include ${path} when it exists in the repo.`);
+  }
+}
+
+const forbiddenPrefixes = [".github/", "src/", "test/", "scripts/", "tmp/"];
+const forbiddenPaths = ["AGENTS.md", "autoresearch.checks.sh", "autoresearch.sh", "bun.lock"];
+
+for (const file of pack.files) {
+  if (forbiddenPrefixes.some((prefix) => file.path.startsWith(prefix)) || forbiddenPaths.includes(file.path)) {
+    throw new Error(`Unexpected file in npm package: ${file.path}`);
+  }
+}
+
+if (pack.name !== "hunkdiff") {
+  throw new Error(`Expected npm package name to be hunkdiff, got ${pack.name}.`);
+}
+
+console.log(`Verified npm pack output for ${pack.name}@${pack.version} (${pack.entryCount} files).`);