diff --git a/apps/web/src/features/sandbox/deployment-specification.test.ts b/apps/web/src/features/sandbox/deployment-specification.test.ts
index 7dbff0823..fe306d494 100644
--- a/apps/web/src/features/sandbox/deployment-specification.test.ts
+++ b/apps/web/src/features/sandbox/deployment-specification.test.ts
@@ -1,5 +1,6 @@
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { defaultSandboxResources, distributionRuntime, savedSpecification, validSandboxResources } from "./deployment-specification";
+import { isRuntimeReleaseField } from "./runtime-release";
 import standardSizes from "./standard-sizes.json";
 import type { SandboxSpecification } from "@agents-core-web/agents-client";
 
@@ -48,6 +49,19 @@ describe("deployment resources and Runtime", () => {
     expect(validSandboxResources("e2b", { cpus: 2, memory_mib: 2048, root_disk_mib: 1024 })).toBe(false);
     expect(validSandboxResources("microsandbox", { cpus: 2, memory_mib: 2048, root_disk_mib: 1023, environment_disk_mib: 8192 })).toBe(false);
   });
+  it("accepts any well-formed Runtime image name in the Runtime reference", async () => {
+    const digest = "b".repeat(64);
+    for (const runtime_ref of [`parsar-core-runtime@sha256:${digest}`, `oac-runtime@sha256:${digest}`]) {
+      vi.stubGlobal("fetch", vi.fn().mockResolvedValue(new Response(JSON.stringify({ ...manifest, runtime_ref }))));
+      expect((await distributionRuntime(new AbortController().signal)).microsandbox_ref).toBe(runtime_ref);
+      expect(isRuntimeReleaseField("microsandbox_ref", runtime_ref)).toBe(true);
+    }
+    for (const runtime_ref of [`oac-runtime:${digest}`, `oac-runtime@sha256:${"b".repeat(63)}`, `oac-runtime@sha256:${"B".repeat(64)}`, `@sha256:${digest}`]) {
+      vi.stubGlobal("fetch", vi.fn().mockResolvedValue(new Response(JSON.stringify({ ...manifest, runtime_ref }))));
+      await expect(distributionRuntime(new AbortController().signal)).rejects.toThrow();
+      expect(isRuntimeReleaseField("microsandbox_ref", runtime_ref)).toBe(false);
+    }
+  });
   it("rejects unavailable, mutable or incomplete release identities", async () => {
     vi.stubGlobal("fetch", vi.fn().mockResolvedValue(new Response("{}", { status: 404 })));
     await expect(distributionRuntime(new AbortController().signal)).rejects.toThrow();
diff --git a/apps/web/src/features/sandbox/deployment-specification.ts b/apps/web/src/features/sandbox/deployment-specification.ts
index 9bf59c471..52ab24559 100644
--- a/apps/web/src/features/sandbox/deployment-specification.ts
+++ b/apps/web/src/features/sandbox/deployment-specification.ts
@@ -1,4 +1,5 @@
 import type { SandboxDeployment, SandboxE2BTemplateBuild, SandboxProvider, SandboxResources, SandboxRuntimeRelease, SandboxSpecification } from "@agents-core-web/agents-client";
+import { RUNTIME_REF_PATTERN } from "./runtime-release";
 import standardSizes from "./standard-sizes.json";
 
 interface Manifest {
@@ -53,7 +54,7 @@ export async function distributionRuntime(signal: AbortSignal): Promise<SandboxR
   const image = /^sha256:[a-f0-9]{64}$/;
   if (manifest.platform !== "linux/amd64" || !/^[a-f0-9]{40}$/.test(manifest.source_commit ?? "")
     || !image.test(manifest.images?.runtime ?? "") || !image.test(manifest.image_manifest_digests?.runtime ?? "")
-    || !/^parsar-core-runtime@sha256:[a-f0-9]{64}$/.test(manifest.runtime_ref ?? "")
+    || !RUNTIME_REF_PATTERN.test(manifest.runtime_ref ?? "")
     || !hash.test(manifest.microsandbox?.runtime_sha256 ?? "") || !hash.test(manifest.microsandbox?.firmware_sha256 ?? "")) throw new Error("invalid distribution");
   return { source_commit: manifest.source_commit!, image_id: manifest.images!.runtime!, image_manifest_digest: manifest.image_manifest_digests!.runtime!,
     microsandbox_ref: manifest.runtime_ref!, runtime_sha256: manifest.microsandbox!.runtime_sha256!, firmware_sha256: manifest.microsandbox!.firmware_sha256! };
diff --git a/apps/web/src/features/sandbox/runtime-release.ts b/apps/web/src/features/sandbox/runtime-release.ts
index 6e56710d9..74b9515c6 100644
--- a/apps/web/src/features/sandbox/runtime-release.ts
+++ b/apps/web/src/features/sandbox/runtime-release.ts
@@ -1,10 +1,13 @@
 import type { SandboxRuntimeRelease } from "@agents-core-web/agents-client";
 
+/** Core owns the Runtime image name, so the Web checks only the `<name>@sha256:<digest>` shape. */
+export const RUNTIME_REF_PATTERN = /^[a-z0-9][a-z0-9._-]*@sha256:[0-9a-f]{64}$/;
+
 const patterns: Record<keyof SandboxRuntimeRelease, RegExp> = {
   source_commit: /^[0-9a-f]{40}$/,
   image_id: /^sha256:[0-9a-f]{64}$/,
   image_manifest_digest: /^sha256:[0-9a-f]{64}$/,
-  microsandbox_ref: /^parsar-core-runtime@sha256:[0-9a-f]{64}$/,
+  microsandbox_ref: RUNTIME_REF_PATTERN,
   runtime_sha256: /^[0-9a-f]{64}$/,
   firmware_sha256: /^[0-9a-f]{64}$/,
 };