diff --git a/deploy/miniapp-market/README.md b/deploy/miniapp-market/README.md
index 2a64ce1c99..80d9d27bea 100644
--- a/deploy/miniapp-market/README.md
+++ b/deploy/miniapp-market/README.md
@@ -28,6 +28,11 @@ MiniApp 市场网页源码在 `src/miniapp-market-web/`，后端入口在
 
 不要单独上传 `dist/`，也不要在服务器上直接改源码。
 
+Skin 市场复用本服务的 GitHub OAuth、桌面 token 和 Web 会话别名。修改
+`miniapp-market-service/src/auth.rs`、`routes.rs` 或 OAuth 回跳参数时，必须同时
+验证 Skin 的“我的投稿”和“审核”接口；Skin 容器只能通过它自己的部署手册和
+专用 checkout 更新，不能从 MiniApp Compose 项目重建。
+
 ## 生产边界
 
 本目录只能部署 MiniApp 市场。不得修改、清理或重启现有 Relay、New API、官网
diff --git a/deploy/skin-market/README.md b/deploy/skin-market/README.md
index 8017a5c086..b325b64168 100644
--- a/deploy/skin-market/README.md
+++ b/deploy/skin-market/README.md
@@ -23,6 +23,12 @@ use the MiniApp auth broker and a `/skin`-scoped alias of that broker's Web
 session. Unsafe browser requests require the matching CSRF alias. Never copy
 the MiniApp OAuth secret into the Skin environment.
 
+The MiniApp identity service must run a commit that implements the same shared
+account contract as Skin. Changes under `miniapp-market-service/src/auth.rs` or
+its OAuth routes must be deployed with the MiniApp runbook before Skin is
+considered healthy. Deploy the two containers separately from their dedicated
+checkouts; do not recreate MiniApp from the Skin Compose project.
+
 ## Agent safety contract
 
 1. Deploy only a committed, explicit commit. Never build a dirty checkout or a
diff --git a/src/crates/services/miniapp-market-service/src/routes.rs b/src/crates/services/miniapp-market-service/src/routes.rs
index bc1ff08023..bfd4686714 100644
--- a/src/crates/services/miniapp-market-service/src/routes.rs
+++ b/src/crates/services/miniapp-market-service/src/routes.rs
@@ -70,6 +70,7 @@ struct ListingQuery {
 #[derive(Debug, Deserialize)]
 #[serde(rename_all = "camelCase")]
 struct OAuthStartQuery {
+    #[serde(alias = "return_to")]
     return_to: Option<String>,
 }
 
@@ -2053,6 +2054,17 @@ mod tests {
     use axum::http::HeaderValue;
     use std::collections::HashSet;
 
+    #[test]
+    fn oauth_start_query_accepts_canonical_and_legacy_return_target_names() {
+        for parameter in ["returnTo", "return_to"] {
+            let uri = format!("/auth/github/start?{parameter}=%2Fskin%2Fadmin")
+                .parse()
+                .unwrap();
+            let Query(query) = Query::<OAuthStartQuery>::try_from_uri(&uri).unwrap();
+            assert_eq!(query.return_to.as_deref(), Some("/skin/admin"));
+        }
+    }
+
     #[test]
     fn review_diff_covers_added_changed_and_removed_files() {
         let previous = BTreeMap::from([
diff --git a/src/miniapp-market-web/src/api.test.ts b/src/miniapp-market-web/src/api.test.ts
index 1f144e1f87..7e24318b2e 100644
--- a/src/miniapp-market-web/src/api.test.ts
+++ b/src/miniapp-market-web/src/api.test.ts
@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest';
 import listingFixture from '../../shared/miniapp-market-contract-fixtures/listing-detail.json';
-import { downloadUrl } from './api';
+import { downloadUrl, loginUrl } from './api';
 import type { MarketListingDetail } from './types';
 
 const typedListingFixture: MarketListingDetail = listingFixture;
@@ -16,4 +16,10 @@ describe('market API paths', () => {
     expect(typedListingFixture.permissions.node?.enabled).toBe(false);
     expect(typedListingFixture.releases[0].reviewBundleHash).toHaveLength(64);
   });
+
+  it('uses the broker camelCase return target contract', () => {
+    expect(loginUrl('/miniapp/admin')).toBe(
+      '/miniapp/api/v1/auth/github/start?returnTo=%2Fminiapp%2Fadmin',
+    );
+  });
 });
diff --git a/src/miniapp-market-web/src/api.ts b/src/miniapp-market-web/src/api.ts
index e62cfda960..dcebaeb18b 100644
--- a/src/miniapp-market-web/src/api.ts
+++ b/src/miniapp-market-web/src/api.ts
@@ -136,7 +136,7 @@ export const marketApi = {
 };
 
 export function loginUrl(returnTo = window.location.pathname): string {
-  return `${API}/auth/github/start?return_to=${encodeURIComponent(returnTo)}`;
+  return `${API}/auth/github/start?returnTo=${encodeURIComponent(returnTo)}`;
 }
 
 export function downloadUrl(slug: string, release: number): string {
diff --git a/src/skin-market-web/src/account.ts b/src/skin-market-web/src/account.ts
index e501cf7bfd..d6f8a8ffa2 100644
--- a/src/skin-market-web/src/account.ts
+++ b/src/skin-market-web/src/account.ts
@@ -66,5 +66,5 @@ export const sharedMarketAccountApi = {
 export function sharedMarketLoginUrl(
   returnTo = `${window.location.pathname}${window.location.search}`,
 ): string {
-  return `${SHARED_ACCOUNT_API_BASE}/auth/github/start?return_to=${encodeURIComponent(returnTo)}`;
+  return `${SHARED_ACCOUNT_API_BASE}/auth/github/start?returnTo=${encodeURIComponent(returnTo)}`;
 }
diff --git a/src/skin-market-web/src/api.test.ts b/src/skin-market-web/src/api.test.ts
index 18ba5c56f0..121a62c041 100644
--- a/src/skin-market-web/src/api.test.ts
+++ b/src/skin-market-web/src/api.test.ts
@@ -48,7 +48,7 @@ describe('Skin Market API paths', () => {
 
   it('uses the MiniApp auth broker and returns to the current Skin route', () => {
     expect(sharedMarketLoginUrl('/skin/appearances/ocean-night?q=dark')).toBe(
-      '/miniapp/api/v1/auth/github/start?return_to=%2Fskin%2Fappearances%2Focean-night%3Fq%3Ddark',
+      '/miniapp/api/v1/auth/github/start?returnTo=%2Fskin%2Fappearances%2Focean-night%3Fq%3Ddark',
     );
   });