diff --git a/packages/alchemy-test/src/Runner.ts b/packages/alchemy-test/src/Runner.ts
index 7c8a58e3cf..589c78c12b 100644
--- a/packages/alchemy-test/src/Runner.ts
+++ b/packages/alchemy-test/src/Runner.ts
@@ -670,13 +670,24 @@ const runSuite: (suite: Suite, ctx: ExecContext) => Effect.Effect<void> =
 const runAfterAll = Effect.fn(function* (suite: Suite, ctx: ExecContext) {
   if (suite.afterAll.length === 0) return;
   yield* ctx.emit({ _tag: "HookStart", file: ctx.file, hook: "afterAll" });
-  const exit = yield* runHooks(suite.afterAll, ctx.options.timeout).pipe(
-    withCapture(ctx.fileLogs),
-    Effect.exit,
-  );
+  // Unlike beforeAll (where a failure invalidates everything after it),
+  // every teardown hook runs even when an earlier one fails: a failing
+  // teardown assertion must not drop later cleanup — in particular
+  // Test.make's fallback hook that closes the shared scope and local
+  // provider sidecar, which registers last and would otherwise leak the
+  // sidecar for the rest of the process. Failures aggregate.
+  const exits = yield* Effect.forEach(suite.afterAll, (hook) =>
+    Effect.suspend(hook.body).pipe(
+      Effect.timeout(Duration.millis(hook.timeout ?? ctx.options.timeout)),
+      Effect.exit,
+    ),
+  ).pipe(withCapture(ctx.fileLogs));
   yield* ctx.emit({ _tag: "HookEnd", file: ctx.file, hook: "afterAll" });
-  if (Exit.isFailure(exit)) {
-    const error = `afterAll hook failed:\n${prettyCause(exit.cause)}`;
+  const failures = exits.filter(Exit.isFailure);
+  if (failures.length > 0) {
+    const error = `afterAll hook failed:\n${failures
+      .map((exit) => prettyCause(exit.cause))
+      .join("\n")}`;
     ctx.fileErrors.push(error);
   }
 });
diff --git a/packages/alchemy-test/test/Runner.test.ts b/packages/alchemy-test/test/Runner.test.ts
index fce50d90d0..81a5961baa 100644
--- a/packages/alchemy-test/test/Runner.test.ts
+++ b/packages/alchemy-test/test/Runner.test.ts
@@ -141,3 +141,53 @@ it("fails the process for every hook kind and preserves hook output", async () =
     await rm(root, { recursive: true, force: true });
   }
 });
+
+it("runs every afterAll hook even when an earlier one fails", async () => {
+  // Regression: `runAfterAll` used to short-circuit on the first failing
+  // hook, so a failing teardown assertion silently dropped every later
+  // afterAll — in particular Test.make's fallback hook that closes the
+  // shared scope and local provider sidecar, leaking the sidecar for the
+  // rest of the process. All teardown hooks must run; failures aggregate.
+  const root = await mkdtemp(resolve(tmpdir(), "alchemy-test-afterall-"));
+  try {
+    await writeFile(
+      resolve(root, "teardown-chain.test.ts"),
+      `
+        import { it, registerHook } from ${JSON.stringify(apiUrl)};
+        import * as Effect from ${JSON.stringify(effectUrl)};
+        registerHook("afterAll", { body: () => Effect.gen(function* () {
+          return yield* Effect.fail(new Error("first-teardown-failed"));
+        }) });
+        registerHook("afterAll", { body: () => Effect.gen(function* () {
+          yield* Effect.log("second-teardown-ran");
+        }) });
+        it("body", () => {});
+      `,
+    );
+
+    const child = Bun.spawn(
+      [process.execPath, cli, root, "--retry", "0", "--concurrency", "1"],
+      {
+        cwd: root,
+        stdout: "pipe",
+        stderr: "pipe",
+        env: { ...process.env, NO_COLOR: "1" },
+      },
+    );
+    const [exitCode, stdout, stderr] = await Promise.all([
+      child.exited,
+      new Response(child.stdout).text(),
+      new Response(child.stderr).text(),
+    ]);
+    const output = `${stdout}\n${stderr}`;
+
+    // The failure is reported and fails the run…
+    expect(exitCode).toBe(1);
+    expect(output).toContain("afterAll hook failed:");
+    expect(output).toContain("first-teardown-failed");
+    // …and the later teardown hook still ran.
+    expect(output).toContain("second-teardown-ran");
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
diff --git a/packages/alchemy/src/Test/Bun.ts b/packages/alchemy/src/Test/Bun.ts
index a5e95db0b5..463d8248bd 100644
--- a/packages/alchemy/src/Test/Bun.ts
+++ b/packages/alchemy/src/Test/Bun.ts
@@ -194,12 +194,25 @@ export const make = <ROut = any>(options: MakeOptions<ROut>): TestApi => {
     bun.beforeEach(() => runEff(eff), hookOptions);
   };
 
+  // bun:test stops running later `afterAll` hooks once one throws, which
+  // would skip the fallback cleanup hook below — leaking the shared scope
+  // and the sidecar for the rest of the process whenever a teardown
+  // assertion fails. Guard every user teardown: on failure, run the
+  // (idempotent) cleanup before rethrowing so the failure still fails the
+  // suite. (`closeAll` is initialized below; hooks only run after `make`
+  // returns.)
+  const guardTeardown = (eff: TestEffect<any>) => () =>
+    runEff(eff).catch(async (error) => {
+      await Effect.runPromise(closeAll);
+      throw error;
+    });
+
   const afterAll = ((eff, hookOptions) => {
-    bun.afterAll(() => runEff(eff), hookOptions ?? DEFAULT_HOOK_TIMEOUT);
+    bun.afterAll(guardTeardown(eff), hookOptions ?? DEFAULT_HOOK_TIMEOUT);
   }) as AfterAllFn;
   afterAll.skipIf = (predicate) => (eff, hookOptions) => {
     if (predicate) return;
-    bun.afterAll(() => runEff(eff), hookOptions ?? DEFAULT_HOOK_TIMEOUT);
+    bun.afterAll(guardTeardown(eff), hookOptions ?? DEFAULT_HOOK_TIMEOUT);
   };
 
   const afterEach: AfterEachFn = (eff, hookOptions) => {
diff --git a/packages/alchemy/test/Test/Bun.test.ts b/packages/alchemy/test/Test/Bun.test.ts
new file mode 100644
index 0000000000..96c7c40f14
--- /dev/null
+++ b/packages/alchemy/test/Test/Bun.test.ts
@@ -0,0 +1,41 @@
+import { describe, expect, test } from "alchemy-test";
+import { fileURLToPath } from "node:url";
+
+const fixturesDir = fileURLToPath(new URL("./fixtures/", import.meta.url));
+
+describe("Bun adapter fallback cleanup", () => {
+  test(
+    "closes the shared scope when a user afterAll throws",
+    async () => {
+      // bun:test stops the afterAll chain on the first throw, so without
+      // the adapter's teardown guard the microtask-registered fallback
+      // (which closes the shared scope + sidecar) never runs. The fixture's
+      // shared-scope finalizer printing proves the guard closed the scope;
+      // the non-zero exit proves the teardown failure still fails the run.
+      const child = Bun.spawn(
+        ["bun", "test", "./bun-teardown-guard.fixture.ts"],
+        {
+          cwd: fixturesDir,
+          stdout: "pipe",
+          stderr: "pipe",
+          env: { ...process.env, NO_COLOR: "1", ALCHEMY_DEV: "" },
+        },
+      );
+      const [exitCode, stdout, stderr] = await Promise.all([
+        child.exited,
+        new Response(child.stdout).text(),
+        new Response(child.stderr).text(),
+      ]);
+      const output = `${stdout}\n${stderr}`;
+
+      expect(exitCode).not.toBe(0);
+      expect(output).toContain("teardown-assertion-failed");
+      const userHook = output.indexOf("BUN_GUARD:user-afterAll-throws");
+      const finalizer = output.indexOf("BUN_GUARD:shared-scope-finalizer-ran");
+      expect(userHook).toBeGreaterThanOrEqual(0);
+      // The cleanup ran, and ran after the failing user teardown.
+      expect(finalizer).toBeGreaterThan(userHook);
+    },
+    { timeout: 60_000 },
+  );
+});
diff --git a/packages/alchemy/test/Test/fixtures/bun-teardown-guard.fixture.ts b/packages/alchemy/test/Test/fixtures/bun-teardown-guard.fixture.ts
new file mode 100644
index 0000000000..2417cc726d
--- /dev/null
+++ b/packages/alchemy/test/Test/fixtures/bun-teardown-guard.fixture.ts
@@ -0,0 +1,29 @@
+// Run by `bun test ./<path>` from Bun.test.ts — the `.fixture.ts` suffix
+// keeps alchemy-test from collecting it. Exercises `alchemy/Test/Bun`'s
+// teardown guard: bun:test stops running later `afterAll` hooks once one
+// throws, so the adapter must run its fallback cleanup (closing the shared
+// scope and sidecar) itself before rethrowing — otherwise a failing
+// teardown assertion leaks them for the rest of the process.
+import * as Effect from "effect/Effect";
+import * as Layer from "effect/Layer";
+import * as Test from "@/Test/Bun.ts";
+
+const { test, beforeAll, afterAll } = Test.make({
+  providers: Layer.empty as never,
+});
+
+// Attaches to the adapter's shared scope (provided to every hook/test by
+// `Core.toEffect`), so this line printing proves the fallback cleanup ran.
+beforeAll(
+  Effect.addFinalizer(() =>
+    Effect.sync(() => console.log("BUN_GUARD:shared-scope-finalizer-ran")),
+  ),
+);
+
+afterAll(
+  Effect.sync(() => {
+    console.log("BUN_GUARD:user-afterAll-throws");
+  }).pipe(Effect.andThen(Effect.fail(new Error("teardown-assertion-failed")))),
+);
+
+test("body", Effect.void);