Codex 0.160.1 remote stdio MCP fix: does it affect Sume?
Codex 0.160.1 preserves SYSTEMROOT, TEMP and TMP for remote stdio MCP launches on Windows hosts. Sume's hosted MCP is HTTP, so no process is launched.
No. The Codex 0.160.1 fix is about remote stdio MCP servers: it preserves SYSTEMROOT, TEMP and TMP when a launch happens on a Windows host. Sume's hosted server is a streamable HTTP endpoint at https://mcp.sume.com/mcp, so Codex does not start a process for it and has no environment to inherit.
Why the difference matters
A stdio server is a child process. Anything it needs from the OS, like temp directories, comes from the environment the launcher passes down. That is the failure the release addresses. An HTTP server is just a URL plus a login, so the failure class does not apply.
If a Windows setup still fails with Sume
Look at the connection and sign-in instead: the URL, the OAuth login for the configured server name, and the scope you granted. The quickstart says the client discovers Sume's protected-resource metadata from the MCP endpoint and is sent to https://mcp.sume.com/oauth/authorize, then on to the consent page.
One thing is easy to confuse: Sume has no local stdio server to launch. Do not configure a stdio entry for Sume. Use the URL.
| Question | Remote stdio server | Sume hosted MCP |
|---|---|---|
| Transport | Child process | Streamable HTTP |
| Needs SYSTEMROOT, TEMP, TMP | Yes, from the launcher | No process |
| Auth | Whatever the server does | OAuth (mcp:read, optional mcp:write) or API key |
| Entry in config | command and args | URL only |
Sources
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