diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..30aae66
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+* text=auto eol=lf
+bin/*.js text eol=lf
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..9877012
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,52 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  compatibility:
+    name: Node 22.0 / ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 10
+    # Node 22.0's npm.ps1 is broken on Windows; Bash selects the bundled npm shell shim instead.
+    # https://github.com/nodejs/node/issues/52682
+    defaults:
+      run:
+        shell: bash
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
+        with:
+          node-version: 22.0.0
+          package-manager-cache: false
+      - run: npm ci --omit=dev --ignore-scripts
+      - run: npm test
+      - run: npm run pack:check
+      - run: npm run pack:smoke
+
+  quality:
+    name: Node 24 quality
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
+        with:
+          node-version: 24.18.0
+          package-manager-cache: false
+      - run: npm ci --ignore-scripts
+      - run: npm audit
+      - run: npm run check
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..721204b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+.DS_Store
+coverage/
+node_modules/
+tmp/
+*.tgz
diff --git a/.npmrc b/.npmrc
new file mode 100644
index 0000000..7f6e831
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1,5 @@
+audit=true
+fund=false
+ignore-scripts=true
+package-lock=true
+save-exact=true
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..fcf8a11
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+nodejs 24.18.0
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..7c8d282
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 First Draft contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..458683d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,32 @@
+# First Draft CLI
+
+`firstdraft` is the command-line client for [First Draft](https://github.com/firstdraft/firstdraft). It is being
+built for agents that author and review Foundation Plans with their users.
+
+The package is not released yet. This repository currently contains only the auditable command shell; Plan and
+network behavior will arrive in reviewed increments.
+
+## Requirements
+
+- Running the CLI: Node.js 22.0.0 or newer
+- Working on this repository: Node.js 24.18.0 (pinned in `.tool-versions`)
+
+## Development
+
+```sh
+npm ci
+npm run check
+npm run pack:check
+```
+
+## Trust model
+
+- The published CLI will run the reviewed JavaScript source directly, without generated or bundled code.
+- The command shell has no runtime dependencies, install scripts, telemetry, update checks, or implicit network
+  activity.
+- Package contents are allowlisted and checked before release.
+- CI exercises the exact minimum Node.js version separately from current development tooling.
+- Public releases will use npm provenance after the first useful version bootstraps trusted publishing.
+
+Security issues should follow the
+[private reporting instructions](https://github.com/firstdraft/cli/security/advisories/new).
diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 0000000..7c42fb2
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,8 @@
+# Security
+
+Please report suspected vulnerabilities through a
+[private GitHub security advisory](https://github.com/firstdraft/cli/security/advisories/new). Do not include
+sensitive details in a public Issue.
+
+The CLI has not released a supported version yet. This policy will name supported release lines before the first
+public package is published.
diff --git a/bin/firstdraft.js b/bin/firstdraft.js
new file mode 100755
index 0000000..75ca241
--- /dev/null
+++ b/bin/firstdraft.js
@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+
+import { run } from "../src/cli.js";
+
+process.stdout.on("error", handleStreamError);
+process.stderr.on("error", handleStreamError);
+
+process.exitCode = run({
+  argv: process.argv.slice(2),
+  stdout: process.stdout,
+  stderr: process.stderr,
+});
+
+/** @param {Error} error */
+function handleStreamError(error) {
+  if ("code" in error && error.code === "EPIPE") return;
+
+  throw error;
+}
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..462fa3a
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,25 @@
+import js from "@eslint/js";
+import globals from "globals";
+
+export default [
+  {
+    ignores: ["node_modules/", "tmp/"],
+  },
+  js.configs.recommended,
+  {
+    files: ["**/*.js"],
+    languageOptions: {
+      ecmaVersion: "latest",
+      sourceType: "module",
+      globals: globals.nodeBuiltin,
+    },
+    linterOptions: {
+      reportUnusedDisableDirectives: "error",
+    },
+    rules: {
+      "no-constant-binary-expression": "error",
+      "no-duplicate-imports": "error",
+      "no-promise-executor-return": "error",
+    },
+  },
+];
diff --git a/jsconfig.json b/jsconfig.json
new file mode 100644
index 0000000..adf5c78
--- /dev/null
+++ b/jsconfig.json
@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "allowJs": true,
+    "checkJs": true,
+    "lib": ["ES2023"],
+    "maxNodeModuleJsDepth": 0,
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "noEmit": true,
+    "noImplicitReturns": true,
+    "noUncheckedIndexedAccess": true,
+    "skipLibCheck": false,
+    "strict": true,
+    "target": "ES2023",
+    "types": ["node"],
+    "verbatimModuleSyntax": true
+  },
+  "include": [
+    "bin/**/*.js",
+    "eslint.config.js",
+    "scripts/**/*.js",
+    "src/**/*.js",
+    "test/**/*.js"
+  ]
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..78b658a
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1335 @@
+{
+  "name": "firstdraft",
+  "version": "0.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "firstdraft",
+      "version": "0.0.0",
+      "license": "MIT",
+      "bin": {
+        "firstdraft": "bin/firstdraft.js"
+      },
+      "devDependencies": {
+        "@eslint/js": "10.0.1",
+        "@types/node": "22.20.1",
+        "eslint": "10.8.0",
+        "globals": "17.8.0",
+        "prettier": "3.9.6",
+        "typescript": "7.0.2"
+      },
+      "engines": {
+        "node": ">=22.0.0"
+      }
+    },
+    "node_modules/@eslint-community/eslint-utils": {
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.10.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+      },
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+        "url": "https://opencollective.com/eslint"
+      },
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+      }
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+      "dev": true,
+      "license": "MIT",
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+      },
+      "funding": {
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+      },
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+        }
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+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-7.0.2.tgz",
+      "integrity": "sha512-8FYau96o3NKOhbjKi/qNvG/W5jhzxkbdm5sj9AbZ/5T5sWqn3hJgLfGx27sRKZWTvyzCP8dLRBTf5tBTSRVUNA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc"
+      },
+      "engines": {
+        "node": ">=16.20.0"
+      },
+      "optionalDependencies": {
+        "@typescript/typescript-aix-ppc64": "7.0.2",
+        "@typescript/typescript-darwin-arm64": "7.0.2",
+        "@typescript/typescript-darwin-x64": "7.0.2",
+        "@typescript/typescript-freebsd-arm64": "7.0.2",
+        "@typescript/typescript-freebsd-x64": "7.0.2",
+        "@typescript/typescript-linux-arm": "7.0.2",
+        "@typescript/typescript-linux-arm64": "7.0.2",
+        "@typescript/typescript-linux-loong64": "7.0.2",
+        "@typescript/typescript-linux-mips64el": "7.0.2",
+        "@typescript/typescript-linux-ppc64": "7.0.2",
+        "@typescript/typescript-linux-riscv64": "7.0.2",
+        "@typescript/typescript-linux-s390x": "7.0.2",
+        "@typescript/typescript-linux-x64": "7.0.2",
+        "@typescript/typescript-netbsd-arm64": "7.0.2",
+        "@typescript/typescript-netbsd-x64": "7.0.2",
+        "@typescript/typescript-openbsd-arm64": "7.0.2",
+        "@typescript/typescript-openbsd-x64": "7.0.2",
+        "@typescript/typescript-sunos-x64": "7.0.2",
+        "@typescript/typescript-win32-arm64": "7.0.2",
+        "@typescript/typescript-win32-x64": "7.0.2"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "6.21.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
+      "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "punycode": "^2.1.0"
+      }
+    },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/word-wrap": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
+      "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..3b1139d
--- /dev/null
+++ b/package.json
@@ -0,0 +1,46 @@
+{
+  "name": "firstdraft",
+  "version": "0.0.0",
+  "description": "Command-line interface for First Draft",
+  "license": "MIT",
+  "type": "module",
+  "bin": {
+    "firstdraft": "./bin/firstdraft.js"
+  },
+  "files": [
+    "bin",
+    "src"
+  ],
+  "engines": {
+    "node": ">=22.0.0"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/firstdraft/cli.git"
+  },
+  "bugs": {
+    "url": "https://github.com/firstdraft/cli/issues"
+  },
+  "homepage": "https://github.com/firstdraft/cli#readme",
+  "publishConfig": {
+    "access": "public"
+  },
+  "scripts": {
+    "check": "npm run typecheck && npm run lint && npm run format:check && npm test && npm run pack:check && npm run pack:smoke",
+    "format": "prettier --write .",
+    "format:check": "prettier --check .",
+    "lint": "eslint .",
+    "pack:check": "node scripts/check-pack.js",
+    "pack:smoke": "node scripts/smoke-package.js",
+    "test": "node scripts/run-tests.js",
+    "typecheck": "tsc --project jsconfig.json"
+  },
+  "devDependencies": {
+    "@eslint/js": "10.0.1",
+    "@types/node": "22.20.1",
+    "eslint": "10.8.0",
+    "globals": "17.8.0",
+    "prettier": "3.9.6",
+    "typescript": "7.0.2"
+  }
+}
diff --git a/scripts/check-pack.js b/scripts/check-pack.js
new file mode 100644
index 0000000..3b06232
--- /dev/null
+++ b/scripts/check-pack.js
@@ -0,0 +1,31 @@
+import assert from "node:assert/strict";
+import { spawnSync } from "node:child_process";
+
+const npmCli = process.env.npm_execpath;
+assert(npmCli, "npm_execpath is required; run this check through npm");
+
+const result = spawnSync(
+  process.execPath,
+  [npmCli, "pack", "--dry-run", "--json", "--ignore-scripts"],
+  { encoding: "utf8" },
+);
+
+if (result.status !== 0) {
+  process.stderr.write(result.stderr);
+  process.exitCode = result.status ?? 1;
+} else {
+  /** @type {{files: {path: string}[]}[]} */
+  const manifests = JSON.parse(result.stdout);
+  const [manifest] = manifests;
+  assert(manifest, "npm pack did not return a manifest");
+  const paths = manifest.files.map(({ path }) => path).sort();
+
+  assert.deepEqual(paths, [
+    "LICENSE",
+    "README.md",
+    "bin/firstdraft.js",
+    "package.json",
+    "src/cli.js",
+    "src/version.js",
+  ]);
+}
diff --git a/scripts/run-tests.js b/scripts/run-tests.js
new file mode 100644
index 0000000..6f237db
--- /dev/null
+++ b/scripts/run-tests.js
@@ -0,0 +1,40 @@
+import assert from "node:assert/strict";
+import { spawnSync } from "node:child_process";
+import { readdirSync } from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+process.chdir(fileURLToPath(new URL("..", import.meta.url)));
+
+const testFiles = findTestFiles("test");
+assert.notEqual(testFiles.length, 0, "No test files found");
+
+const result = spawnSync(process.execPath, ["--test", ...testFiles], {
+  stdio: "inherit",
+});
+
+if (result.error) {
+  throw result.error;
+}
+
+process.exitCode = result.status ?? 1;
+
+/**
+ * @param {string} directory
+ * @returns {string[]}
+ */
+function findTestFiles(directory) {
+  return readdirSync(directory, { withFileTypes: true })
+    .flatMap((entry) => {
+      const entryPath = path.join(directory, entry.name);
+
+      if (entry.isDirectory()) {
+        return findTestFiles(entryPath);
+      }
+
+      return entry.isFile() && entry.name.endsWith(".test.js")
+        ? [entryPath]
+        : [];
+    })
+    .sort();
+}
diff --git a/scripts/smoke-package.js b/scripts/smoke-package.js
new file mode 100644
index 0000000..7184fcb
--- /dev/null
+++ b/scripts/smoke-package.js
@@ -0,0 +1,87 @@
+import assert from "node:assert/strict";
+import { spawnSync } from "node:child_process";
+import {
+  mkdtempSync,
+  mkdirSync,
+  readFileSync,
+  rmSync,
+  writeFileSync,
+} from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
+
+const npmCli = requiredEnvironmentVariable("npm_execpath");
+
+/** @type {{version: string}} */
+const packageMetadata = JSON.parse(readFileSync("package.json", "utf8"));
+const temporaryDirectory = mkdtempSync(path.join(tmpdir(), "firstdraft-cli-"));
+const installationDirectory = path.join(temporaryDirectory, "installation");
+
+try {
+  const packResult = runNpm([
+    "pack",
+    "--json",
+    "--ignore-scripts",
+    "--pack-destination",
+    temporaryDirectory,
+  ]);
+  /** @type {{filename: string}[]} */
+  const packedManifests = JSON.parse(packResult.stdout);
+  const [packed] = packedManifests;
+  assert(packed, "npm pack did not return a manifest");
+  const tarball = path.join(temporaryDirectory, packed.filename);
+
+  mkdirSync(installationDirectory);
+  writeFileSync(
+    path.join(installationDirectory, "package.json"),
+    '{"name":"firstdraft-smoke","private":true}\n',
+  );
+
+  runNpm(
+    [
+      "install",
+      "--ignore-scripts",
+      "--no-audit",
+      "--no-fund",
+      "--offline",
+      "--no-save",
+      tarball,
+    ],
+    installationDirectory,
+  );
+  const execution = runNpm(
+    ["exec", "--offline", "--", "firstdraft", "--version"],
+    installationDirectory,
+  );
+
+  assert.equal(execution.stdout, `${packageMetadata.version}\n`);
+  assert.equal(execution.stderr, "");
+} finally {
+  rmSync(temporaryDirectory, { recursive: true, force: true });
+}
+
+/**
+ * @param {string[]} arguments_
+ * @param {string} [cwd]
+ */
+function runNpm(arguments_, cwd = process.cwd()) {
+  const result = spawnSync(process.execPath, [npmCli, ...arguments_], {
+    cwd,
+    encoding: "utf8",
+  });
+
+  assert.equal(
+    result.status,
+    0,
+    `npm ${arguments_.join(" ")} failed\n${result.stdout}${result.stderr}`,
+  );
+
+  return result;
+}
+
+/** @param {string} name */
+function requiredEnvironmentVariable(name) {
+  const value = process.env[name];
+  assert(value, `${name} is required; run this check through npm`);
+  return value;
+}
diff --git a/src/cli.js b/src/cli.js
new file mode 100644
index 0000000..e7ce7fe
--- /dev/null
+++ b/src/cli.js
@@ -0,0 +1,84 @@
+import { parseArgs } from "node:util";
+
+import { VERSION } from "./version.js";
+
+const HELP = `First Draft CLI
+
+Usage:
+  firstdraft [options]
+
+Options:
+  -h, --help     Show help
+  -V, --version  Show version
+`;
+
+const USAGE_ERROR = "Invalid arguments.\nRun 'firstdraft --help' for usage.\n";
+const UNKNOWN_COMMAND =
+  "Unknown command.\nRun 'firstdraft --help' for usage.\n";
+
+/**
+ * @typedef {object} Writer
+ * @property {(text: string) => unknown} write
+ */
+
+/**
+ * @typedef {object} RunOptions
+ * @property {readonly string[]} argv
+ * @property {Writer} stdout
+ * @property {Writer} stderr
+ */
+
+/** @param {RunOptions} options */
+export function run({ argv, stdout, stderr }) {
+  let parsed;
+
+  try {
+    parsed = parseArgs({
+      args: [...argv],
+      options: {
+        help: { type: "boolean", short: "h" },
+        version: { type: "boolean", short: "V" },
+      },
+      allowPositionals: true,
+      strict: true,
+    });
+  } catch (error) {
+    if (!isParseArgsError(error)) throw error;
+
+    stderr.write(USAGE_ERROR);
+    return 2;
+  }
+
+  if (argv.length === 0) {
+    stdout.write(HELP);
+    return 0;
+  }
+
+  if (parsed.positionals.length > 0) {
+    stderr.write(UNKNOWN_COMMAND);
+    return 2;
+  }
+
+  if (parsed.values.help) {
+    stdout.write(HELP);
+    return 0;
+  }
+
+  if (parsed.values.version) {
+    stdout.write(`${VERSION}\n`);
+    return 0;
+  }
+
+  stdout.write(HELP);
+  return 0;
+}
+
+/** @param {unknown} error */
+function isParseArgsError(error) {
+  return (
+    error instanceof Error &&
+    "code" in error &&
+    typeof error.code === "string" &&
+    error.code.startsWith("ERR_PARSE_ARGS_")
+  );
+}
diff --git a/src/version.js b/src/version.js
new file mode 100644
index 0000000..a3d7124
--- /dev/null
+++ b/src/version.js
@@ -0,0 +1,11 @@
+import { readFileSync } from "node:fs";
+
+const packageMetadata = JSON.parse(
+  readFileSync(new URL("../package.json", import.meta.url), "utf8"),
+);
+
+if (typeof packageMetadata.version !== "string") {
+  throw new TypeError("package.json must declare a string version");
+}
+
+export const VERSION = packageMetadata.version;
diff --git a/test/cli.test.js b/test/cli.test.js
new file mode 100644
index 0000000..40049df
--- /dev/null
+++ b/test/cli.test.js
@@ -0,0 +1,169 @@
+import assert from "node:assert/strict";
+import { spawn, spawnSync } from "node:child_process";
+import { once } from "node:events";
+import { readFile } from "node:fs/promises";
+import { fileURLToPath } from "node:url";
+import test from "node:test";
+
+import { run } from "../src/cli.js";
+import { VERSION } from "../src/version.js";
+
+const HELP = `First Draft CLI
+
+Usage:
+  firstdraft [options]
+
+Options:
+  -h, --help     Show help
+  -V, --version  Show version
+`;
+const USAGE_ERROR = "Invalid arguments.\nRun 'firstdraft --help' for usage.\n";
+const UNKNOWN_COMMAND =
+  "Unknown command.\nRun 'firstdraft --help' for usage.\n";
+const packageMetadata = JSON.parse(
+  await readFile(new URL("../package.json", import.meta.url), "utf8"),
+);
+
+test("no arguments show help", () => {
+  const result = invoke([]);
+
+  assert.deepEqual(result, { status: 0, stdout: HELP, stderr: "" });
+});
+
+test("help uses long and short options", () => {
+  const long = invoke(["--help"]);
+  const short = invoke(["-h"]);
+
+  assert.deepEqual(long, { status: 0, stdout: HELP, stderr: "" });
+  assert.deepEqual(short, long);
+});
+
+test("version matches the package through long and short options", () => {
+  const long = invoke(["--version"]);
+  const short = invoke(["-V"]);
+
+  assert.equal(VERSION, packageMetadata.version);
+  assert.deepEqual(long, { status: 0, stdout: `${VERSION}\n`, stderr: "" });
+  assert.deepEqual(short, long);
+});
+
+test("an unknown command returns a non-echoing usage error", () => {
+  const canary = "\u001b[31mcanary-secret-command\n";
+
+  for (const argv of [
+    [canary],
+    [canary, "--help"],
+    ["--help", canary],
+    [canary, "--version"],
+    ["--version", canary],
+  ]) {
+    const result = invoke(argv);
+
+    assert.deepEqual(result, {
+      status: 2,
+      stdout: "",
+      stderr: UNKNOWN_COMMAND,
+    });
+    assert.doesNotMatch(result.stderr, /canary-secret|\n\n/);
+    assert.equal(result.stderr.includes("\u001b"), false);
+  }
+});
+
+test("an unknown option returns a non-echoing usage error", () => {
+  for (const argv of [
+    ["--canary-secret-option"],
+    ["--canary-secret-option", "--help"],
+    ["--help", "--canary-secret-option"],
+  ]) {
+    const result = invoke(argv);
+
+    assert.deepEqual(result, { status: 2, stdout: "", stderr: USAGE_ERROR });
+    assert.doesNotMatch(result.stderr, /canary-secret/);
+  }
+});
+
+test("recognized root options have deterministic precedence", () => {
+  for (const argv of [
+    ["--help", "--version"],
+    ["-hV"],
+    ["--help", "--help"],
+    ["--"],
+  ]) {
+    assert.deepEqual(invoke(argv), { status: 0, stdout: HELP, stderr: "" });
+  }
+
+  assert.deepEqual(invoke(["--version", "--version"]), {
+    status: 0,
+    stdout: `${VERSION}\n`,
+    stderr: "",
+  });
+});
+
+test("argument parsing does not mutate injected input", () => {
+  const argv = Object.freeze(["--version"]);
+
+  assert.equal(invoke(argv).status, 0);
+  assert.deepEqual(argv, ["--version"]);
+});
+
+test("the executable delegates success and usage errors to the tested runner", () => {
+  const executable = fileURLToPath(
+    new URL("../bin/firstdraft.js", import.meta.url),
+  );
+  const success = spawnSync(process.execPath, [executable, "--version"], {
+    encoding: "utf8",
+  });
+  const usageError = spawnSync(process.execPath, [executable, "unknown"], {
+    encoding: "utf8",
+  });
+
+  assert.deepEqual(
+    { status: success.status, stdout: success.stdout, stderr: success.stderr },
+    { status: 0, stdout: `${VERSION}\n`, stderr: "" },
+  );
+  assert.deepEqual(
+    {
+      status: usageError.status,
+      stdout: usageError.stdout,
+      stderr: usageError.stderr,
+    },
+    { status: 2, stdout: "", stderr: UNKNOWN_COMMAND },
+  );
+});
+
+test("the executable preserves its status when an output pipe closes", async () => {
+  const executable = fileURLToPath(
+    new URL("../bin/firstdraft.js", import.meta.url),
+  );
+  const help = spawn(process.execPath, [executable, "--help"], {
+    stdio: ["ignore", "pipe", "pipe"],
+  });
+  help.stdout.destroy();
+  const [helpStatus, helpSignal] = await once(help, "close");
+
+  assert.equal(helpStatus, 0);
+  assert.equal(helpSignal, null);
+
+  const usageError = spawn(process.execPath, [executable, "unknown"], {
+    stdio: ["ignore", "pipe", "pipe"],
+  });
+  usageError.stderr.destroy();
+  const [usageStatus, usageSignal] = await once(usageError, "close");
+
+  assert.equal(usageStatus, 2);
+  assert.equal(usageSignal, null);
+});
+
+/** @param {readonly string[]} argv */
+function invoke(argv) {
+  let stdout = "";
+  let stderr = "";
+
+  const status = run({
+    argv,
+    stdout: { write: (text) => (stdout += text) },
+    stderr: { write: (text) => (stderr += text) },
+  });
+
+  return { status, stdout, stderr };
+}
diff --git a/test/package.test.js b/test/package.test.js
new file mode 100644
index 0000000..aae81dd
--- /dev/null
+++ b/test/package.test.js
@@ -0,0 +1,46 @@
+import assert from "node:assert/strict";
+import { readFile } from "node:fs/promises";
+import test from "node:test";
+
+const metadata = JSON.parse(
+  await readFile(new URL("../package.json", import.meta.url), "utf8"),
+);
+
+test("package metadata preserves the audited runtime boundary", () => {
+  assert.equal(metadata.name, "firstdraft");
+  assert.equal(metadata.type, "module");
+  assert.equal(metadata.engines.node, ">=22.0.0");
+  assert.deepEqual(metadata.bin, { firstdraft: "./bin/firstdraft.js" });
+  assert.deepEqual(metadata.files, ["bin", "src"]);
+  assert.equal(metadata.scripts.test, "node scripts/run-tests.js");
+
+  for (const property of [
+    "dependencies",
+    "optionalDependencies",
+    "peerDependencies",
+    "peerDependenciesMeta",
+    "bundledDependencies",
+    "bundleDependencies",
+  ]) {
+    assert.equal(property in metadata, false, `${property} must stay absent`);
+  }
+});
+
+test("package metadata defines no installation lifecycle", () => {
+  for (const script of [
+    "preinstall",
+    "install",
+    "postinstall",
+    "prepack",
+    "postpack",
+    "prepare",
+    "prepublish",
+    "prepublishOnly",
+  ]) {
+    assert.equal(
+      script in metadata.scripts,
+      false,
+      `${script} must stay absent`,
+    );
+  }
+});