diff --git a/codex-rs/core/src/status.rs b/codex-rs/core/src/status.rs
new file mode 100644
index 0000000000..ec73d2e136
--- /dev/null
+++ b/codex-rs/core/src/status.rs
@@ -0,0 +1,266 @@
+use std::time::Duration;
+
+use anyhow::Context;
+use anyhow::Result;
+use anyhow::anyhow;
+use anyhow::bail;
+use codex_client::HttpTransport;
+use codex_client::Request;
+use codex_client::ReqwestTransport;
+use http::header::CONTENT_TYPE;
+use reqwest::Method;
+use serde::Deserialize;
+use serde::Serialize;
+use strum_macros::Display;
+use tokio::time::Instant;
+
+const STATUS_WIDGET_URL: &str = "https://status.openai.com/proxy/status.openai.com";
+const CODEX_COMPONENT_NAME: &str = "Codex";
+const DEFAULT_IDLE_TIMEOUT: Duration = Duration::from_secs(30);
+
+#[derive(Debug, Clone, Display, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub(crate) enum ComponentHealth {
+    Operational,
+    DegradedPerformance,
+    PartialOutage,
+    MajorOutage,
+    UnderMaintenance,
+    #[serde(other)]
+    Unknown,
+}
+
+impl ComponentHealth {
+    fn operational() -> Self {
+        Self::Operational
+    }
+
+    pub(crate) fn is_operational(self) -> bool {
+        self == Self::Operational
+    }
+}
+
+pub(crate) struct IdleWarning {
+    last_event: Instant,
+    idle_timeout: Duration,
+    warning_sent: bool,
+}
+
+impl IdleWarning {
+    pub(crate) fn new(idle_timeout: Duration) -> Self {
+        Self {
+            last_event: Instant::now(),
+            idle_timeout,
+            warning_sent: false,
+        }
+    }
+
+    pub(crate) fn deadline(&self) -> Instant {
+        self.last_event + self.idle_timeout
+    }
+
+    pub(crate) fn mark_event(&mut self) {
+        self.last_event = Instant::now();
+    }
+
+    pub(crate) async fn maybe_warning_message(&mut self) -> Option<String> {
+        if self.warning_sent {
+            return None;
+        }
+
+        if let Ok(status) = fetch_codex_health().await {
+            if !status.is_operational() {
+                self.warning_sent = true;
+                return Some(format!(
+                    "OpenAI status: {status:?}. Responses may be delayed or stalled."
+                ));
+            }
+        }
+
+        None
+    }
+}
+
+impl Default for IdleWarning {
+    fn default() -> Self {
+        Self::new(DEFAULT_IDLE_TIMEOUT)
+    }
+}
+
+async fn fetch_codex_health() -> Result<ComponentHealth> {
+    let client = reqwest::Client::builder()
+        .connect_timeout(Duration::from_secs(5))
+        .timeout(Duration::from_secs(10))
+        .build()
+        .context("building HTTP client")?;
+
+    let response = ReqwestTransport::new(client)
+        .execute(Request::new(Method::GET, STATUS_WIDGET_URL.to_string()))
+        .await
+        .context("requesting status widget")?;
+
+    let content_type = response
+        .headers
+        .get(CONTENT_TYPE)
+        .and_then(|value| value.to_str().ok())
+        .unwrap_or_default()
+        .to_ascii_lowercase();
+
+    if !content_type.contains("json") {
+        let snippet = String::from_utf8_lossy(&response.body)
+            .chars()
+            .take(200)
+            .collect::<String>();
+
+        bail!(
+            "Expected JSON from {STATUS_WIDGET_URL}: Content-Type={content_type}. Body starts with: {snippet:?}"
+        );
+    }
+
+    let payload: StatusPayload =
+        serde_json::from_slice(&response.body).context("parsing status widget JSON")?;
+
+    derive_component_health(&payload, CODEX_COMPONENT_NAME)
+}
+
+#[derive(Debug, Clone, Deserialize, Default)]
+struct StatusPayload {
+    #[serde(default)]
+    summary: Summary,
+}
+
+#[derive(Debug, Clone, Deserialize, Default)]
+struct Summary {
+    #[serde(default)]
+    components: Vec<Component>,
+    #[serde(default)]
+    affected_components: Vec<AffectedComponent>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+struct Component {
+    id: String,
+    name: String,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+struct AffectedComponent {
+    component_id: String,
+    #[serde(default = "ComponentHealth::operational")]
+    status: ComponentHealth,
+}
+
+fn derive_component_health(
+    payload: &StatusPayload,
+    component_name: &str,
+) -> Result<ComponentHealth> {
+    let component = payload
+        .summary
+        .components
+        .iter()
+        .find(|component| component.name == component_name)
+        .ok_or_else(|| anyhow!("Component {component_name:?} not found in status summary"))?;
+
+    let status = payload
+        .summary
+        .affected_components
+        .iter()
+        .find(|affected| affected.component_id == component.id)
+        .map(|affected| affected.status)
+        .unwrap_or(ComponentHealth::Operational);
+
+    Ok(status)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use pretty_assertions::assert_eq;
+    use serde_json::json;
+
+    #[test]
+    fn defaults_to_operational_when_not_affected() {
+        let payload = serde_json::from_value::<StatusPayload>(json!({
+            "summary": {
+                "id": "sum-1",
+                "name": "OpenAI",
+                "components": [
+                    {"id": "cmp-1", "name": "Codex", "status_page_id": "page-1"},
+                    {"id": "cmp-2", "name": "Chat", "status_page_id": "page-1"}
+                ]
+            }
+        }))
+        .expect("valid payload");
+
+        let status = derive_component_health(&payload, "Codex").expect("codex component exists");
+
+        assert_eq!(status, ComponentHealth::Operational);
+        assert!(status.is_operational());
+    }
+
+    #[test]
+    fn uses_affected_component_status() {
+        let payload = serde_json::from_value::<StatusPayload>(json!({
+            "summary": {
+                "id": "sum-1",
+                "name": "OpenAI",
+                "components": [
+                    {"id": "cmp-1", "name": "Codex", "status_page_id": "page-1"}
+                ],
+                "affected_components": [
+                    {"component_id": "cmp-1", "status": "major_outage"}
+                ]
+            }
+        }))
+        .expect("valid payload");
+
+        let status = derive_component_health(&payload, "Codex").expect("codex component exists");
+
+        assert_eq!(status, ComponentHealth::MajorOutage);
+        assert!(!status.is_operational());
+    }
+
+    #[test]
+    fn unknown_status_is_preserved_as_unknown() {
+        let payload = serde_json::from_value::<StatusPayload>(json!({
+            "summary": {
+                "id": "sum-1",
+                "name": "OpenAI",
+                "components": [
+                    {"id": "cmp-1", "name": "Codex", "status_page_id": "page-1"}
+                ],
+                "affected_components": [
+                    {"component_id": "cmp-1", "status": "custom_status"}
+                ]
+            }
+        }))
+        .expect("valid payload");
+
+        let status = derive_component_health(&payload, "Codex").expect("codex component exists");
+
+        assert_eq!(status, ComponentHealth::Unknown);
+        assert!(!status.is_operational());
+    }
+
+    #[test]
+    fn missing_component_returns_error() {
+        let payload = serde_json::from_value::<StatusPayload>(json!({
+            "summary": {
+                "id": "sum-1",
+                "name": "OpenAI",
+                "components": [],
+                "affected_components": []
+            }
+        }))
+        .expect("valid payload");
+
+        let error =
+            derive_component_health(&payload, "Codex").expect_err("missing component should error");
+
+        assert!(
+            error
+                .to_string()
+                .contains("Component \"Codex\" not found in status summary")
+        );
+    }
+}