openai/codex · error · anyhow::Error

expected exactly one client subscribed to the thread, found

Error message

expected exactly one client subscribed to the thread, found {}

What it means

Error "expected exactly one client subscribed to the thread, found {}" thrown in openai/codex.

Source

Thrown at codex-rs/app-server/src/current_time.rs:146

            let _canceled = outgoing.cancel_request(&request_id).await;
            bail!(
                "current-time request timed out after {}s",
                CURRENT_TIME_REQUEST_TIMEOUT.as_secs()
            );
        }
    };
    let response: CurrentTimeReadResponse =
        serde_json::from_value(result).context("invalid current-time response")?;

    DateTime::from_timestamp(response.current_time_at, 0)
        .ok_or_else(|| anyhow!("current-time response is outside the supported range"))
}

fn require_single_current_time_connection(connection_ids: &[ConnectionId]) -> Result<ConnectionId> {
    // External clocks are not interchangeable, so do not choose one silently.
    match connection_ids {
        [connection_id] => Ok(*connection_id),
        _ => bail!(
            "expected exactly one client subscribed to the thread, found {}",
            connection_ids.len()
        ),
    }
}

#[cfg(test)]
mod tests {
    use super::require_single_current_time_connection;
    use crate::outgoing_message::ConnectionId;

    #[test]
    fn current_time_connection_must_be_unambiguous() {
        assert_eq!(
            require_single_current_time_connection(&[ConnectionId(7)]).unwrap(),
            ConnectionId(7)
        );
        assert_eq!(

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/app-server/src/current_time.rs:146 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/3b122efb7e9e274d. Report an issue: GitHub.