{"id":18999869,"date":"2026-08-21T21:13:32","date_gmt":"2026-08-21T21:13:32","guid":{"rendered":"https:\/\/wordpress.org\/support\/topic\/royal-mcp-action-discovery-failed\/"},"modified":"2026-08-21T21:13:32","modified_gmt":"2026-08-21T21:13:32","slug":"royal-mcp-action-discovery-failed","status":"publish","type":"topic","link":"https:\/\/wordpress.org\/support\/topic\/royal-mcp-action-discovery-failed\/","title":{"rendered":"Royal Mcp Action Discovery Failed"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Royal MCP 1.4.42 fails with ChatGPT Developer Mode custom connector. OAuth completes, but ChatGPT reports \u201cAuthentication succeeded, action discovery failed\u201d and shows no actions.<br \/>Endpoint:\u00a0<code>https:\/\/www.mydomain.com\/wp-json\/royal-mcp\/v1\/mcp<\/code><br \/>Both OAuth metadata endpoints return 200 JSON,\u00a0<code>\/register<\/code>\u00a0and\u00a0<code>\/token<\/code>\u00a0return 204 on OPTIONS, and the MCP endpoint returns the expected 401 JSON-RPC challenge. OAuth state was reset, permalinks flushed, and LiteSpeed cache purged. Please test the authenticated\u00a0<code>initialize<\/code>\u00a0and\u00a0<code>tools\/list<\/code>\u00a0responses for ChatGPT compatibility, response-size limits, or an invalid tool schema.<\/p>\n","protected":false},"template":"","class_list":["post-18999869","topic","type-topic","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/18999869","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic"}],"about":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/18999869\/revisions"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/media?parent=18999869"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}