diff --git a/packages/mcp-core/src/utils/url-utils.ts b/packages/mcp-core/src/utils/url-utils.ts
index 8e90b1e83..09d8b0b0a 100644
--- a/packages/mcp-core/src/utils/url-utils.ts
+++ b/packages/mcp-core/src/utils/url-utils.ts
@@ -1,4 +1,4 @@
-import { isSentryHost as isSharedSentryHost } from "@sentry/toolkit-core/sentry-host";
+import { isSentryHost } from "@sentry/toolkit-core/sentry-host";
 import type { SentryProtocol } from "../types";
 import {
   type EventsDataset,
@@ -6,11 +6,6 @@ import {
   isProfilesDataset,
 } from "./events-datasets";
 
-/** Keep the MCP utility export for its existing consumers. */
-export function isSentryHost(host: string): boolean {
-  return isSharedSentryHost(host);
-}
-
 /** Hosts that use the public SaaS control host and organization web subdomains. */
 export function isPublicSentryHost(host: string): boolean {
   return isSentryHost(host) && !host.endsWith(".my.sentry.io");
diff --git a/packages/mcp-server/src/auth/constants.ts b/packages/mcp-server/src/auth/constants.ts
index 7b70c38ac..4655b4341 100644
--- a/packages/mcp-server/src/auth/constants.ts
+++ b/packages/mcp-server/src/auth/constants.ts
@@ -1,5 +1,4 @@
 import { SCOPES } from "@sentry/mcp-core/scopes";
-import { isSentryHost } from "@sentry/mcp-core/utils/url-utils";
 
 /**
  * Public OAuth app registered on sentry.io for the stdio device code flow.
@@ -15,12 +14,6 @@ export const DEVICE_CODE_ENDPOINT = "/oauth/device/code/";
 export const TOKEN_ENDPOINT = "/oauth/token/";
 export const DEVICE_CODE_SCOPES = Object.keys(SCOPES).join(" ");
 
-/**
- * Whether device code auth is available for this host.
- * Supports sentry.io and regional subdomains (us.sentry.io, eu.sentry.io).
- */
-export { isSentryHost as isSentryIo };
-
 /**
  * OAuth endpoints live on sentry.io regardless of regional host.
  * Always use this as the host for device code and token requests.
diff --git a/packages/mcp-server/src/auth/resolve-token.ts b/packages/mcp-server/src/auth/resolve-token.ts
index 1d91bfa49..fbb3c72a0 100644
--- a/packages/mcp-server/src/auth/resolve-token.ts
+++ b/packages/mcp-server/src/auth/resolve-token.ts
@@ -1,5 +1,6 @@
+import { isSentryHost } from "@sentry/toolkit-core/sentry-host";
 import type { PartiallyResolvedConfig, ResolvedConfig } from "../cli/types";
-import { isSentryIo, OAUTH_HOST } from "./constants";
+import { OAUTH_HOST } from "./constants";
 import { authenticate } from "./device-code-flow";
 import { readCachedToken, writeCachedToken } from "./token-cache";
 import { toCachedToken } from "./types";
@@ -26,7 +27,7 @@ export async function resolveAccessToken(
     return withToken(partial, partial.accessToken);
   }
 
-  if (!isSentryIo(partial.sentryHost)) {
+  if (!isSentryHost(partial.sentryHost)) {
     throw new Error(
       "Error: No access token was provided. Device code authentication is only supported for sentry.io.\n" +
         "Pass one with `--access-token` or via `SENTRY_ACCESS_TOKEN`.",
diff --git a/packages/mcp-server/src/cli/commands/auth.ts b/packages/mcp-server/src/cli/commands/auth.ts
index 15b2208fc..3630951a1 100644
--- a/packages/mcp-server/src/cli/commands/auth.ts
+++ b/packages/mcp-server/src/cli/commands/auth.ts
@@ -1,10 +1,7 @@
+import { isSentryHost } from "@sentry/toolkit-core/sentry-host";
 import { parseEnv } from "../parse";
 import { resolveHost } from "../resolve";
-import {
-  DEFAULT_SENTRY_CLIENT_ID,
-  isSentryIo,
-  OAUTH_HOST,
-} from "../../auth/constants";
+import { DEFAULT_SENTRY_CLIENT_ID, OAUTH_HOST } from "../../auth/constants";
 import { authenticate } from "../../auth/device-code-flow";
 import {
   readCachedToken,
@@ -46,7 +43,7 @@ function resolveAuthContext(argv: string[]): AuthContext {
 async function login(argv: string[]): Promise<void> {
   const { sentryHost, clientId } = resolveAuthContext(argv);
 
-  if (!isSentryIo(sentryHost)) {
+  if (!isSentryHost(sentryHost)) {
     console.error(
       "Error: Device code authentication is only supported for sentry.io.",
     );
diff --git a/packages/mcp-server/src/cli/resolve.ts b/packages/mcp-server/src/cli/resolve.ts
index 83f2c9e5a..d51b0baaa 100644
--- a/packages/mcp-server/src/cli/resolve.ts
+++ b/packages/mcp-server/src/cli/resolve.ts
@@ -4,8 +4,8 @@ import {
   parseSkills,
   type Skill,
 } from "@sentry/mcp-core/skills";
+import { isSentryHost } from "@sentry/toolkit-core/sentry-host";
 import {
-  isSentryHost,
   validateAndParseSentryUrlThrows,
   validateOpenAiBaseUrlThrows,
   validateSentryHostThrows,