diff --git a/canvas/src/app/api/buildinfo/__tests__/route.test.ts b/canvas/src/app/api/buildinfo/__tests__/route.test.ts
new file mode 100644
index 00000000..ac2d8f7b
--- /dev/null
+++ b/canvas/src/app/api/buildinfo/__tests__/route.test.ts
@@ -0,0 +1,48 @@
+/**
+ * Canvas /api/buildinfo — version-display endpoint mirroring
+ * workspace-server's /buildinfo. Lets `curl <url>/api/buildinfo`
+ * confirm which git SHA is live on a canvas deployment.
+ */
+import { describe, it, expect, beforeEach, afterEach } from "vitest";
+import { GET } from "../route";
+
+const ENV_KEYS = ["VERCEL_GIT_COMMIT_SHA", "VERCEL_GIT_COMMIT_REF", "VERCEL_ENV"];
+
+describe("GET /api/buildinfo", () => {
+  let saved: Record<string, string | undefined>;
+
+  beforeEach(() => {
+    saved = Object.fromEntries(ENV_KEYS.map((k) => [k, process.env[k]]));
+    for (const k of ENV_KEYS) delete process.env[k];
+  });
+
+  afterEach(() => {
+    for (const k of ENV_KEYS) {
+      if (saved[k] === undefined) delete process.env[k];
+      else process.env[k] = saved[k];
+    }
+  });
+
+  it("returns dev sentinel when Vercel env vars are unset", async () => {
+    const res = await GET();
+    const body = await res.json();
+    expect(body).toEqual({ git_sha: "dev", git_ref: "", vercel_env: "local" });
+  });
+
+  it("reports the SHA Vercel injected at build time", async () => {
+    process.env.VERCEL_GIT_COMMIT_SHA = "abc1234567890";
+    process.env.VERCEL_GIT_COMMIT_REF = "main";
+    process.env.VERCEL_ENV = "production";
+    const res = await GET();
+    const body = await res.json();
+    expect(body.git_sha).toBe("abc1234567890");
+    expect(body.git_ref).toBe("main");
+    expect(body.vercel_env).toBe("production");
+  });
+
+  it("returns 200 status and JSON content type", async () => {
+    const res = await GET();
+    expect(res.status).toBe(200);
+    expect(res.headers.get("content-type")).toContain("application/json");
+  });
+});
diff --git a/canvas/src/app/api/buildinfo/route.ts b/canvas/src/app/api/buildinfo/route.ts
new file mode 100644
index 00000000..a8ff8aab
--- /dev/null
+++ b/canvas/src/app/api/buildinfo/route.ts
@@ -0,0 +1,18 @@
+import { NextResponse } from "next/server";
+
+// Mirror of workspace-server's GET /buildinfo (PR #2398). Lets a developer
+// confirm which git SHA is live on a canvas deployment with the same
+// `curl <url>/buildinfo` flow they use against tenant workspaces.
+//
+// Vercel injects VERCEL_GIT_COMMIT_SHA / _REF / VERCEL_ENV at build time
+// from the deploying commit; outside Vercel (local `next dev`, harness)
+// these are unset and the endpoint reports `git_sha: "dev"`. Same sentinel
+// the workspace-server uses pre-ldflags-injection so both surfaces speak
+// the same vocabulary.
+export async function GET() {
+  return NextResponse.json({
+    git_sha: process.env.VERCEL_GIT_COMMIT_SHA ?? "dev",
+    git_ref: process.env.VERCEL_GIT_COMMIT_REF ?? "",
+    vercel_env: process.env.VERCEL_ENV ?? "local",
+  });
+}