[Remote MCP] Error when trying to log in - Error: Metadata error:
Resolved 💬 6 comments Opened Oct 30, 2025 by MrAshRhodes Closed Mar 29, 2026
💡 Likely answer: A maintainer (github-actions[bot], contributor)
responded on this thread — see the highlighted reply below.
What version of Codex is running?
codex-cli 0.50.0
What subscription do you have?
api key
Which model were you using?
gpt-5
What platform is your computer?
Darwin 25.1.0 arm64 arm
What issue are you seeing?
Ive set my config to use a remote mcp with oauth.
I have set - experimental_use_rmcp_client = true
[mcp_servers.remote]
type = "http"
url = "https://xxxx.com/mcp/default"when using codex mcp login remote
Error: Metadata error: Failed to parse metadata: error decoding response body
The mcp server and oauth work in other applications i.e copilot, claude etc
What steps can reproduce the bug?
set config for a remote server
run codex mcp login $server_name
What is the expected behavior?
directed to an oauth login page for authentication.
Additional information
_No response_
6 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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Can you share the MCP server? Is the url publicly accessible even if I may or may not be able to log in?
I am getting this with HuggingFace's MCP:
$ codex mcp add --url "https://huggingface.co/mcp?login" huggingface
Added global MCP server 'huggingface'.
Detected OAuth support. Starting OAuth flow…
Error: Metadata error: Failed to parse metadata: error decoding response body
I had the same problem and traced it to the MCP rust-sdk and fixed it there.
The fix is now incorporated in release:
https://github.com/modelcontextprotocol/rust-sdk/releases/tag/rmcp-v0.9.1
All that is left is to bump
rmcp = { version = "0.9.0", default-features = false } -> rmcp = { version = "0.9.1", default-features = false }
https://github.com/openai/codex/blob/0dd822264a9265749d4f698674553a8d8f747ede/codex-rs/Cargo.toml#L171C1-L171C55
https://github.com/openai/codex/releases/tag/rust-v0.64.0 is now available with the updated version of the
rust-sdkcrate!This bug report hasn't received any upvotes or additional posts in three months. Closing.