diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4ca8f7c..da13ba8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,6 +24,11 @@ jobs:
         with:
           bun-version: latest
 
+      - name: Setup Node
+        uses: actions/setup-node@v6
+        with:
+          node-version: 24
+
       - name: Install
         run: bun install --frozen-lockfile
 
@@ -38,3 +43,6 @@ jobs:
 
       - name: Test with coverage
         run: bun run test:coverage
+
+      - name: Test published package
+        run: bun run test:package
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 2998154..891681a 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -79,6 +79,10 @@ jobs:
         if: steps.check.outputs.already_published == 'false'
         run: bun run test:coverage
 
+      - name: Test published package
+        if: steps.check.outputs.already_published == 'false'
+        run: bun run test:package
+
       # Uses npm OIDC trusted publishing (no NPM_TOKEN).
       # Requires npm >= 11.5.1. Node 24 ships with npm 11.x; if the default
       # npm is too old we fall through to npx with a pinned version.
diff --git a/.gitignore b/.gitignore
index b43aa5c..56998aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 node_modules/
 .DS_Store
 coverage/
-
+dist/
diff --git a/biome.json b/biome.json
index 99abd23..317775a 100644
--- a/biome.json
+++ b/biome.json
@@ -9,6 +9,7 @@
     "includes": [
       "src/**/*.ts",
       "test/**/*.ts",
+      "scripts/**/*.mjs",
       "*.json",
       "*.md",
       "!**/node_modules",
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..3dc3312
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,5 @@
+import type { Plugin } from "@opencode-ai/plugin"
+
+export declare const OpencodeTranslate: Plugin
+
+export default OpencodeTranslate
diff --git a/knip.json b/knip.json
index b360d7e..14dfc5c 100644
--- a/knip.json
+++ b/knip.json
@@ -10,6 +10,7 @@
     "@ai-sdk/openai-compatible"
   ],
   "ignoreIssues": {
+    "index.d.ts": ["duplicates"],
     "src/index.ts": ["duplicates"]
   }
 }
diff --git a/package.json b/package.json
index fd74954..1d70475 100644
--- a/package.json
+++ b/package.json
@@ -1,9 +1,10 @@
 {
   "name": "opencode-translate",
-  "version": "1.0.6",
+  "version": "1.0.7",
   "description": "OpenCode plugin that lets the user chat in a configured language while the main chat loop only sees English.",
   "type": "module",
-  "main": "src/index.ts",
+  "main": "dist/index.js",
+  "types": "index.d.ts",
   "license": "MIT",
   "repository": {
     "type": "git",
@@ -21,7 +22,8 @@
     "i18n"
   ],
   "files": [
-    "src",
+    "dist",
+    "index.d.ts",
     "LICENSE",
     "README.md"
   ],
@@ -29,6 +31,7 @@
     "access": "public"
   },
   "scripts": {
+    "build": "bun build src/index.ts --outfile dist/index.js --target node --format esm --packages external",
     "typecheck": "tsgo --noEmit",
     "format": "biome format --write .",
     "format:check": "biome format .",
@@ -38,7 +41,10 @@
     "check": "biome check --write .",
     "check:ci": "biome check .",
     "test": "bun test",
-    "test:coverage": "bun test --coverage"
+    "test:coverage": "bun test --coverage",
+    "test:package": "node scripts/package-smoke.mjs",
+    "prepare": "bun run build",
+    "prepack": "bun run build"
   },
   "peerDependencies": {
     "@opencode-ai/plugin": ">=1.14.0"
diff --git a/scripts/package-smoke.mjs b/scripts/package-smoke.mjs
new file mode 100644
index 0000000..dd98e8e
--- /dev/null
+++ b/scripts/package-smoke.mjs
@@ -0,0 +1,53 @@
+import assert from "node:assert/strict"
+import { spawnSync } from "node:child_process"
+import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises"
+import { tmpdir } from "node:os"
+import path from "node:path"
+import { fileURLToPath } from "node:url"
+
+const root = fileURLToPath(new URL("..", import.meta.url))
+const temp = await mkdtemp(path.join(tmpdir(), "opencode-translate-package-"))
+
+function run(command, args, cwd) {
+  const result = spawnSync(command, args, { cwd, encoding: "utf8" })
+  if (result.status !== 0) {
+    throw new Error(`${command} ${args.join(" ")} failed\n${result.stdout}\n${result.stderr}`)
+  }
+  return result.stdout
+}
+
+try {
+  const output = run("npm", ["pack", "--silent", "--json", "--pack-destination", temp], root)
+  const jsonStart = output.lastIndexOf("\n[")
+  const [packed] = JSON.parse(output.slice(jsonStart === -1 ? 0 : jsonStart + 1))
+  const paths = packed.files.map((file) => file.path)
+
+  assert(paths.includes("dist/index.js"), "package must contain the compiled entrypoint")
+  assert(paths.includes("index.d.ts"), "package must contain its public type declarations")
+  assert(!paths.some((file) => file.endsWith(".ts") && file !== "index.d.ts"), "package must not contain TS source")
+
+  const consumer = path.join(temp, "consumer")
+  await mkdir(consumer)
+  await writeFile(path.join(consumer, "package.json"), '{"private":true,"type":"module"}\n')
+
+  const tarball = path.join(temp, packed.filename)
+  run("npm", ["install", "--silent", "--ignore-scripts", "--no-audit", "--no-fund", tarball], consumer)
+  run(
+    "node",
+    [
+      "--input-type=module",
+      "--eval",
+      `
+        import assert from "node:assert/strict"
+        process.env.OPENCODE_TRANSLATE_DISABLE = "1"
+        const plugin = await import("opencode-translate")
+        assert.equal(typeof plugin.default, "function")
+        assert.equal(plugin.default, plugin.OpencodeTranslate)
+        assert.deepEqual(await plugin.default({ client: {}, directory: process.cwd() }, {}), {})
+      `,
+    ],
+    consumer,
+  )
+} finally {
+  await rm(temp, { recursive: true, force: true })
+}
diff --git a/test/types/public-api.test.ts b/test/types/public-api.test.ts
new file mode 100644
index 0000000..6b393fc
--- /dev/null
+++ b/test/types/public-api.test.ts
@@ -0,0 +1,25 @@
+/**
+ * Compile-time guard for the published type declaration.
+ *
+ * `index.d.ts` is hand-written and shipped to consumers instead of `main`
+ * (see `types` in package.json); nothing else ties it to the real
+ * implementation in `src/index.ts`. `bun run typecheck` includes this file
+ * (via the `test/**\/*.ts` glob in tsconfig.json), so a renamed, added,
+ * removed, or retyped export in either file fails the build here instead of
+ * shipping silently to consumers.
+ *
+ * This file has no `test()` calls — it is a compile-time-only check. Under
+ * `bun test` it is collected but contributes 0 assertions; the real
+ * enforcement happens in `bun run typecheck`.
+ */
+type SourceTypes = typeof import("../../src/index")
+type PublishedTypes = typeof import("../../index")
+
+type AssertExact<A, B> = [A] extends [B] ? ([B] extends [A] ? true : false) : false
+
+type PublicApiMatchesSource = AssertExact<SourceTypes, PublishedTypes>
+
+// If this line reports a type error, `index.d.ts` no longer matches the
+// exports of `src/index.ts` — update whichever one is stale.
+const publicApiMatchesSource: PublicApiMatchesSource = true
+void publicApiMatchesSource