diff --git a/.changeset/add-bt-cli-bin.md b/.changeset/add-bt-cli-bin.md
new file mode 100644
index 000000000..c0859c3a7
--- /dev/null
+++ b/.changeset/add-bt-cli-bin.md
@@ -0,0 +1,5 @@
+---
+"braintrust": minor
+---
+
+feat: ship the `bt` CLI with the SDK. Installing `braintrust` now exposes a `bt` command in `node_modules/.bin` that runs the prebuilt native binary for your platform (delivered via `@braintrust/bt-*` optional dependencies).
diff --git a/js/bin/bt.cjs b/js/bin/bt.cjs
new file mode 100755
index 000000000..5dd1e3d54
--- /dev/null
+++ b/js/bin/bt.cjs
@@ -0,0 +1,76 @@
+#!/usr/bin/env node
+"use strict";
+
+// Launcher for the `bt` CLI. The native binary ships in a per-platform
+// package (`@braintrust/bt-<platform>`) listed as an optionalDependency of
+// `braintrust`; npm/pnpm install only the one matching the host. This script
+// resolves that binary and forwards argv + exit code.
+
+const { spawnSync } = require("node:child_process");
+
+const PLATFORM_PACKAGES = {
+  "darwin-arm64": "@braintrust/bt-darwin-arm64",
+  "darwin-x64": "@braintrust/bt-darwin-x64",
+  "linux-arm64": "@braintrust/bt-linux-arm64",
+  "linux-x64-glibc": "@braintrust/bt-linux-x64",
+  "linux-x64-musl": "@braintrust/bt-linux-x64-musl",
+  "win32-arm64": "@braintrust/bt-win32-arm64",
+  "win32-x64": "@braintrust/bt-win32-x64",
+};
+
+function detectLibc() {
+  if (process.platform !== "linux") return null;
+  try {
+    const report = process.report && process.report.getReport();
+    if (report && report.header && report.header.glibcVersionRuntime) {
+      return "glibc";
+    }
+    return "musl";
+  } catch {
+    return "glibc";
+  }
+}
+
+function platformKey() {
+  const { platform, arch } = process;
+  if (platform === "linux" && arch === "x64") {
+    return `linux-x64-${detectLibc()}`;
+  }
+  return `${platform}-${arch}`;
+}
+
+function binaryName() {
+  return process.platform === "win32" ? "bt.exe" : "bt";
+}
+
+function resolveBinary() {
+  const pkg = PLATFORM_PACKAGES[platformKey()];
+  if (!pkg) {
+    throw new Error(
+      `No prebuilt bt binary for ${process.platform}-${process.arch}. ` +
+        `Supported platforms: ${Object.keys(PLATFORM_PACKAGES).join(", ")}.`,
+    );
+  }
+  try {
+    return require.resolve(`${pkg}/bin/${binaryName()}`);
+  } catch (err) {
+    throw new Error(
+      `Failed to locate the bt binary from "${pkg}". It is an optional ` +
+        `dependency of "braintrust"; reinstall your dependencies to fetch ` +
+        `it (${err.message}).`,
+    );
+  }
+}
+
+try {
+  const result = spawnSync(resolveBinary(), process.argv.slice(2), {
+    stdio: "inherit",
+    windowsHide: true,
+  });
+  if (result.error) throw result.error;
+  if (result.signal) process.kill(process.pid, result.signal);
+  process.exit(result.status ?? 1);
+} catch (err) {
+  console.error(`bt: ${err.message}`);
+  process.exit(1);
+}
diff --git a/js/package.json b/js/package.json
index 8361036e0..0bf568b95 100644
--- a/js/package.json
+++ b/js/package.json
@@ -19,7 +19,8 @@
     "./dist/index.d.mts": "./dist/browser.d.mts"
   },
   "bin": {
-    "braintrust": "./dist/cli.js"
+    "braintrust": "./dist/cli.js",
+    "bt": "./bin/bt.cjs"
   },
   "exports": {
     "./package.json": "./package.json",
@@ -127,7 +128,8 @@
   "files": [
     "dist/**/*",
     "dev/dist/**/*",
-    "util/dist/**/*"
+    "util/dist/**/*",
+    "bin/bt.cjs"
   ],
   "scripts": {
     "build": "cross-env NODE_OPTIONS=\"--max-old-space-size=8192\" tsup",
@@ -224,6 +226,15 @@
   "peerDependencies": {
     "zod": "^3.25.34 || ^4.0"
   },
+  "optionalDependencies": {
+    "@braintrust/bt-darwin-arm64": "0.10.0",
+    "@braintrust/bt-darwin-x64": "0.10.0",
+    "@braintrust/bt-linux-arm64": "0.10.0",
+    "@braintrust/bt-linux-x64": "0.10.0",
+    "@braintrust/bt-linux-x64-musl": "0.10.0",
+    "@braintrust/bt-win32-arm64": "0.10.0",
+    "@braintrust/bt-win32-x64": "0.10.0"
+  },
   "publishConfig": {
     "access": "public",
     "registry": "https://registry.npmjs.org/",
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 1f040496c..31bde25c3 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -10,6 +10,7 @@ blockExoticSubdeps: true
 minimumReleaseAge: 4320 # 3 days (in minutes)
 minimumReleaseAgeExclude:
   - "@apm-js-collab/*" # instrumentation deps we need to pin closely
+  - "@braintrust/bt-*" # bt binary packages, published in lockstep with braintrust
 trustPolicy: no-downgrade
 # Ignore the check for packages published more than 30 days ago (pnpm 10.27+)
 # Useful for older packages that pre-date provenance support