Update README and OAuth response handling for improved user flow

README.md

@@ -81,7 +81,7 @@ Use a dedicated public hostname such as `mcp.ryankegel.com` and terminate HTTPS
 
    The MCP endpoint is `https://mcp.ryankegel.com/mcp`. The OAuth discovery and login endpoints share that hostname. The MCP allowed-host setting also prevents requests to unexpected hostnames.
 
-5. In ChatGPT on the web, add a custom MCP server with that `/mcp` URL and choose OAuth authentication. The server supports Dynamic Client Registration (DCR). On the first authorization, sign in with `MCP_AUTH_USERNAME` and the password stored in `secrets/mcp_auth_password`, then approve the requested vault access.
+5. In ChatGPT on the web, add a custom MCP server with that `/mcp` URL and choose OAuth authentication. The server supports Dynamic Client Registration (DCR). On the first authorization, sign in with `MCP_AUTH_USERNAME` and the password stored in `secrets/mcp_auth_password`, approve the requested vault access, then click **Continue** to return to ChatGPT.
 
 ## Enable writes
 

oauth.py

@@ -27,7 +27,7 @@ from mcp.server.auth.provider import (
 from mcp.shared.auth import OAuthClientInformationFull, OAuthToken
 from starlette.exceptions import HTTPException
 from starlette.requests import Request
-from starlette.responses import HTMLResponse, RedirectResponse, Response
+from starlette.responses import HTMLResponse, Response
 
 
 ACCESS_TOKEN_SECONDS = 60 * 60
@@ -543,7 +543,23 @@ def make_login_routes(provider: LocalOAuthProvider) -> list[Any]:
 
         await provider.clear_login_failures(client_ip)
         redirect_url = await provider.finish_login(flow_id, username)
-        response = _protect_login_response(RedirectResponse(redirect_url, status_code=303))
+        safe_redirect_url = html.escape(redirect_url, quote=True)
+        success_page = f"""<!doctype html>
+<html lang="en">
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Authorization complete</title>
+<style>
+body {{ font: 16px system-ui, sans-serif; max-width: 34rem; margin: 4rem auto; padding: 0 1rem; color: #17202a; }}
+a {{ display: inline-block; padding: .7rem 1rem; border-radius: .35rem; background: #1457c5; color: white; text-decoration: none; }}
+</style>
+<h1>Authorization complete</h1>
+<p>Continue to return to the app that requested access.</p>
+<a href="{safe_redirect_url}" rel="noreferrer">Continue</a>
+</html>"""
+        response = _protect_login_response(
+            HTMLResponse(success_page)
+        )
         response.delete_cookie(_csrf_cookie_name(flow_id), path="/", secure=True, httponly=True, samesite="strict")
         return response