{
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  "path": "/t/chatgpt-does-not-echo-back-mcp-session-id-anymore-violating-mcp-transport-rules/1380087#post_3",
  "publishedAt": "2026-05-01T09:23:20.000Z",
  "site": "https://community.openai.com",
  "textContent": "Hi Casey,\n\nThanks for the quick response.\n\nWe noticed yesterday, while adapting our MCP server logic to this update that on ChatGPT iOS and ChatGPT Mac OS the tool calls still do not echo back the `MCP-Session-Id`, **but the ChatGPT web application is echoing it back again** , this conflicts with what you say in your reply.\n\nCould you clarify why we are seeing `MCP-Session-Id` in the requests again for ` \"jsonRpcMethods\": [ \"tools/call\" ],` - type of requests\n?",
  "title": "ChatGPT does NOT echo back mcp-session-id anymore - violating MCP transport rules"
}