René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Cursors are not sent to the server correctly","articleBody":"**Describe the bug**\nThe `PaginatedRequest` model has the `cursor` parameter in the wrong place: `request.cursor` instead of `request.params.cursor` as defined by the [pagination spec](https://modelcontextprotocol.io/specification/2025-03-26/server/utilities/pagination#request-format). \n\nSince the methods updated in https://github.com/modelcontextprotocol/python-sdk/pull/718 pass the `cursor` parameter down to the `PaginatedRequest` model, they are also affected by this bug.\n\n**To Reproduce**\n```py\nfrom mcp import types\n\nlist_tools_request = types.ListToolsRequest(\n    method=\"tools/list\",\n    cursor=\"123\",\n)\n\nclient_request = types.ClientRequest(list_tools_request)\n\n# Dump to JSON\nclient_request_json = client_request.model_dump_json()\nprint(client_request_json)\n```\n```\n❯ python test.py\n{\"method\":\"tools/list\",\"params\":null,\"cursor\":\"123\"}\n```\n\n**Expected behavior**\nA request that conforms to the [pagination spec](https://modelcontextprotocol.io/specification/2025-03-26/server/utilities/pagination#request-format):\n```\n{\"method\":\"tools/list\",\"params\":{\"cursor\":\"123\"}}\n```\n\n","author":{"url":"https://github.com/nbarbettini","@type":"Person","name":"nbarbettini"},"datePublished":"2025-05-16T13:46:06.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/735/python-sdk/issues/735"}