openai/codex · error · anyhow::Error

code-mode client sent a message on the wrong websocket lane

Error message

code-mode client sent a message on the wrong websocket lane

What it means

Error "code-mode client sent a message on the wrong websocket lane" thrown in openai/codex.

Source

Thrown at codex-rs/code-mode-host/src/lib.rs:216

                message = reader.read() => (
                    message.context("failed to read code-mode client control message")?,
                    TransportLane::Control,
                ),
                message = async {
                    match &mut bulk_reader {
                        Some(reader) => reader.read().await,
                        None => Ok(None),
                    }
                }, if bulk_reader.is_some() => (
                    message.context("failed to read code-mode client bulk message")?,
                    TransportLane::Bulk,
                ),
            };
            let Some(message) = message else {
                break;
            };
            if bulk_reader.is_some() && !message.allows_transport_lane(lane) {
                anyhow::bail!("code-mode client sent a message on the wrong websocket lane");
            }
            match message {
                ClientToHost::ClientHello(_) => {
                    anyhow::bail!("received a second code-mode client hello");
                }
                ClientToHost::Request { id, request } => {
                    state.spawn_request(id, request)?;
                }
                ClientToHost::CancelRequest { id } => {
                    state.cancel_request(id);
                }
                ClientToHost::DelegateResponse { id, result } => {
                    peer.complete(id, result.into_result()).await;
                }
            }
        }
        Ok::<(), anyhow::Error>(())
    }

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/code-mode-host/src/lib.rs:216 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/2a63173b931d0c5f. Report an issue: GitHub.