diff --git a/codex-rs/app-server/tests/suite/v2/sleep.rs b/codex-rs/app-server/tests/suite/v2/sleep.rs
index 93542f4388..2b60c6a783 100644
--- a/codex-rs/app-server/tests/suite/v2/sleep.rs
+++ b/codex-rs/app-server/tests/suite/v2/sleep.rs
@@ -5,19 +5,23 @@ use codex_app_server_protocol::ClientRequest;
 use codex_app_server_protocol::CurrentTimeReadResponse;
 use codex_app_server_protocol::ItemCompletedNotification;
 use codex_app_server_protocol::ItemStartedNotification;
+use codex_app_server_protocol::JSONRPCErrorError;
 use codex_app_server_protocol::ServerRequest;
 use codex_app_server_protocol::SleepItem;
 use codex_app_server_protocol::ThreadItem;
 use codex_app_server_protocol::ThreadStartParams;
 use codex_app_server_protocol::ThreadStartResponse;
+use codex_app_server_protocol::TurnCompletedNotification;
 use codex_app_server_protocol::TurnStartParams;
 use codex_app_server_protocol::TurnStartResponse;
+use codex_app_server_protocol::TurnStatus;
 use codex_app_server_protocol::UserInput as V2UserInput;
 use core_test_support::responses;
 use pretty_assertions::assert_eq;
 use serde_json::json;
 use std::time::Duration;
 use tempfile::TempDir;
+use test_case::test_case;
 use tokio::time::timeout;
 
 use super::analytics::captured_analytics_events;
@@ -159,13 +163,19 @@ async fn clock_tools_emit_control_tool_analytics() -> Result<()> {
     Ok(())
 }
 
+#[test_case(0; "initial read fails")]
+#[test_case(1; "polling read fails")]
+#[test_case(3; "successful reads")]
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn external_sleep_polls_current_time_and_emits_items() -> Result<()> {
+async fn external_sleep_polls_current_time_and_emits_items(
+    successful_sleep_reads: usize,
+) -> Result<()> {
     const CALL_ID: &str = "sleep-1";
     const DURATION_MS: u64 = 2_000;
+    let read_fails = successful_sleep_reads < 3;
 
     let server = responses::start_mock_server().await;
-    responses::mount_sse_sequence(
+    let model = responses::mount_sse_sequence(
         &server,
         vec![
             responses::sse(vec![
@@ -189,13 +199,15 @@ async fn external_sleep_polls_current_time_and_emits_items() -> Result<()> {
     let codex_home = TempDir::new()?;
     MockResponsesConfig::new(&server.uri())
         .with_root_config("include_environment_context = false")
-        .with_extra_config(
-            r#"[features.current_time_reminder]
+        .with_extra_config(&format!(
+            r#"[features]
+nonfatal_clock_read_errors = {read_fails}
+[features.current_time_reminder]
 enabled = true
 sleep_tool = true
 clock_source = "external"
 "#,
-        )
+        ))
         .write(codex_home.path())?;
 
     let mut mcp = TestAppServer::builder()
@@ -228,21 +240,51 @@ clock_source = "external"
     // Read once for the initial reminder, then once to establish the sleep deadline.
     respond_to_current_time_read(&mut mcp, &thread.id, CURRENT_TIME_AT).await?;
     let started = wait_for_sleep_started(&mut mcp, CALL_ID).await?;
-    respond_to_current_time_read(&mut mcp, &thread.id, CURRENT_TIME_AT).await?;
-
-    // The first poll remains below the deadline, so the provider must request time again.
-    respond_to_current_time_read(&mut mcp, &thread.id, CURRENT_TIME_AT + 1).await?;
-    respond_to_current_time_read(&mut mcp, &thread.id, CURRENT_TIME_AT + 2).await?;
+    for current_time_at in [CURRENT_TIME_AT, CURRENT_TIME_AT + 1, CURRENT_TIME_AT + 2]
+        .into_iter()
+        .take(successful_sleep_reads)
+    {
+        respond_to_current_time_read(&mut mcp, &thread.id, current_time_at).await?;
+    }
+    if read_fails {
+        let request = timeout(
+            DEFAULT_READ_TIMEOUT,
+            mcp.read_stream_until_request_message(),
+        )
+        .await??;
+        let ServerRequest::CurrentTimeRead { request_id, params } = request else {
+            panic!("expected clock read, got {request:?}");
+        };
+        assert_eq!(params.thread_id, thread.id);
+        mcp.send_error(
+            request_id,
+            JSONRPCErrorError {
+                code: -32_000,
+                message: "PRIVATE_CLOCK_ERROR".to_string(),
+                data: None,
+            },
+        )
+        .await?;
+    }
 
     let completed = wait_for_sleep_completed(&mut mcp, CALL_ID).await?;
 
-    // The next inference boundary reads the same external clock after the sleep completes.
+    // The next inference boundary reads the same external clock after the tool returns.
     respond_to_current_time_read(&mut mcp, &thread.id, CURRENT_TIME_AT + 2).await?;
-    timeout(
+    let turn_completed: TurnCompletedNotification = timeout(
         DEFAULT_READ_TIMEOUT,
-        mcp.read_stream_until_notification_message("turn/completed"),
+        mcp.read_notification("turn/completed"),
     )
     .await??;
+    assert_eq!(turn_completed.turn.status, TurnStatus::Completed);
+    if read_fails {
+        let requests = model.requests();
+        assert_eq!(requests.len(), 2);
+        assert_eq!(
+            requests[1].function_call_output_text(CALL_ID).as_deref(),
+            Some("failed to read current time")
+        );
+    }
 
     let expected_item = ThreadItem::Sleep(SleepItem {
         id: CALL_ID.to_string(),
diff --git a/codex-rs/core/config.schema.json b/codex-rs/core/config.schema.json
index 5058ed4875..1928af9db0 100644
--- a/codex-rs/core/config.schema.json
+++ b/codex-rs/core/config.schema.json
@@ -894,6 +894,9 @@
             "non_prefixed_mcp_tool_names": {
               "$ref": "#/definitions/FeatureToml_for_NonPrefixedMcpToolNamesConfigToml"
             },
+            "nonfatal_clock_read_errors": {
+              "type": "boolean"
+            },
             "omit_app_server_notification_media": {
               "type": "boolean"
             },
@@ -6531,6 +6534,9 @@
         "non_prefixed_mcp_tool_names": {
           "$ref": "#/definitions/FeatureToml_for_NonPrefixedMcpToolNamesConfigToml"
         },
+        "nonfatal_clock_read_errors": {
+          "type": "boolean"
+        },
         "omit_app_server_notification_media": {
           "type": "boolean"
         },
diff --git a/codex-rs/core/src/agent/control/spawn.rs b/codex-rs/core/src/agent/control/spawn.rs
index 77d4726de6..95d148c2e4 100644
--- a/codex-rs/core/src/agent/control/spawn.rs
+++ b/codex-rs/core/src/agent/control/spawn.rs
@@ -6,6 +6,7 @@ use crate::codex_thread::CodexThread;
 use crate::config::PermissionProfileSnapshot;
 use crate::context::ContextualUserFragment;
 use crate::context::CurrentTimeReminder;
+use crate::context::CurrentTimeUnavailable;
 use crate::context::DeveloperInstructions;
 use crate::context::GuardianContextMode;
 use crate::context::ManagedDeveloperInstructions;
@@ -135,6 +136,7 @@ fn retain_forked_developer_message(
                 ))
             || MultiAgentModeInstructions::matches_text(text)
             || CurrentTimeReminder::matches_text(text)
+            || CurrentTimeUnavailable::matches_text(text)
             || usage_hint_texts
                 .iter()
                 .any(|usage_hint_text| usage_hint_text == text))
diff --git a/codex-rs/core/src/context/current_time_reminder.rs b/codex-rs/core/src/context/current_time_reminder.rs
index e70bd0c9d7..2273cbc04c 100644
--- a/codex-rs/core/src/context/current_time_reminder.rs
+++ b/codex-rs/core/src/context/current_time_reminder.rs
@@ -41,3 +41,31 @@ impl ContextualUserFragment for CurrentTimeReminder {
         format!("It is {}.", self.formatted_time())
     }
 }
+
+pub(crate) struct CurrentTimeUnavailable;
+
+impl CurrentTimeUnavailable {
+    pub(crate) const MESSAGE: &str = "failed to read current time";
+}
+
+impl ContextualUserFragment for CurrentTimeUnavailable {
+    fn content_kind(&self) -> ContentItemKind {
+        ContentItemKind("current_time.unavailable".to_string())
+    }
+
+    fn role(&self) -> &'static str {
+        "developer"
+    }
+
+    fn markers(&self) -> (&'static str, &'static str) {
+        Self::type_markers()
+    }
+
+    fn type_markers() -> (&'static str, &'static str) {
+        ("<current_time_unavailable>", "</current_time_unavailable>")
+    }
+
+    fn body(&self) -> String {
+        Self::MESSAGE.to_string()
+    }
+}
diff --git a/codex-rs/core/src/context/mod.rs b/codex-rs/core/src/context/mod.rs
index 35bd92794a..7c61965105 100644
--- a/codex-rs/core/src/context/mod.rs
+++ b/codex-rs/core/src/context/mod.rs
@@ -66,6 +66,7 @@ pub(crate) use contextual_user_message::is_contextual_user_fragment;
 pub(crate) use contextual_user_message::is_user_authorization_message;
 pub(crate) use contextual_user_message::parse_visible_hook_prompt_message;
 pub(crate) use current_time_reminder::CurrentTimeReminder;
+pub(crate) use current_time_reminder::CurrentTimeUnavailable;
 pub(crate) use developer_instructions::DeveloperInstructions;
 pub(crate) use environments_instructions::EnvironmentsInstructions;
 pub(crate) use guardian_approved_action::GuardianApprovedAction;
diff --git a/codex-rs/core/src/context/world_state/environment.rs b/codex-rs/core/src/context/world_state/environment.rs
index 8f38946ede..c1656865cb 100644
--- a/codex-rs/core/src/context/world_state/environment.rs
+++ b/codex-rs/core/src/context/world_state/environment.rs
@@ -92,6 +92,7 @@ impl EnvironmentsState {
             shell_version: self.shell_version.clone(),
             shell_version_removed: false,
             current_date: self.current_date.clone(),
+            current_date_removed: false,
             timezone: self.timezone.clone(),
             network: self.network.clone(),
             filesystem: self.filesystem.clone(),
@@ -183,6 +184,8 @@ impl WorldStateSection for EnvironmentsState {
                 shell_version_removed: self.shell_version.is_none()
                     && previous.shell_version.is_some(),
                 current_date: self.current_date.clone(),
+                current_date_removed: self.current_date.is_none()
+                    && previous.current_date.is_some(),
                 timezone: self.timezone.clone(),
                 network: self.network.clone(),
                 filesystem: self.filesystem.clone(),
@@ -221,6 +224,7 @@ struct RenderedEnvironments {
     shell_version: Option<String>,
     shell_version_removed: bool,
     current_date: Option<String>,
+    current_date_removed: bool,
     timezone: Option<String>,
     network: Option<NetworkContext>,
     filesystem: Option<FileSystemContext>,
@@ -289,7 +293,11 @@ impl ContextualUserFragment for RenderedEnvironments {
             let shell_version = self.shell_version.as_deref();
             push_optional_element(&mut rendered, "shell_version", shell_version);
         }
-        push_optional_element(&mut rendered, "current_date", self.current_date.as_deref());
+        if self.current_date_removed {
+            rendered.push_str("  <current_date status=\"unavailable\" />\n");
+        } else {
+            push_optional_element(&mut rendered, "current_date", self.current_date.as_deref());
+        }
         push_optional_element(&mut rendered, "timezone", self.timezone.as_deref());
         if let Some(network) = &self.network {
             rendered.push_str("  ");
diff --git a/codex-rs/core/src/context/world_state/environment_render_tests.rs b/codex-rs/core/src/context/world_state/environment_render_tests.rs
index 0d1198d052..1f24d55476 100644
--- a/codex-rs/core/src/context/world_state/environment_render_tests.rs
+++ b/codex-rs/core/src/context/world_state/environment_render_tests.rs
@@ -396,3 +396,31 @@ fn shell_version_diff_clears_previously_visible_version() {
         "<environment_context>\n  <shell_version status=\"unavailable\" />\n</environment_context>"
     );
 }
+
+#[test]
+fn current_date_diff_clears_once_and_recovers() {
+    let available = EnvironmentsState {
+        current_date: Some("2026-06-17".to_string()),
+        ..Default::default()
+    };
+    let unavailable = EnvironmentsState::default();
+    assert_eq!(
+        unavailable
+            .render_diff(PreviousSectionState::Known(&available.snapshot()))
+            .expect("removed current date")
+            .render(),
+        "<environment_context>\n  <current_date status=\"unavailable\" />\n</environment_context>"
+    );
+    assert!(
+        unavailable
+            .render_diff(PreviousSectionState::Known(&unavailable.snapshot()))
+            .is_none()
+    );
+    assert_eq!(
+        available
+            .render_diff(PreviousSectionState::Known(&unavailable.snapshot()))
+            .expect("restored current date")
+            .render(),
+        "<environment_context>\n  <current_date>2026-06-17</current_date>\n</environment_context>"
+    );
+}
diff --git a/codex-rs/core/src/session/time_reminder.rs b/codex-rs/core/src/session/time_reminder.rs
index 6f42343a94..b4a2650f8f 100644
--- a/codex-rs/core/src/session/time_reminder.rs
+++ b/codex-rs/core/src/session/time_reminder.rs
@@ -11,6 +11,7 @@ use super::turn_context::TurnContext;
 use crate::config::Config;
 use crate::config::CurrentTimeReminderConfig;
 use crate::context::ContextualUserFragment;
+use crate::context::CurrentTimeUnavailable;
 use crate::context_manager::is_user_turn_boundary;
 
 pub(super) fn apply_persistent_defaults(config: &mut Config) {
@@ -40,6 +41,7 @@ pub(super) fn apply_persistent_defaults(config: &mut Config) {
 pub(crate) struct CurrentTimeReminderState {
     last_delivery_time: Option<DateTime<Utc>>,
     last_window_id: Option<String>,
+    last_clock_failure: Option<(String, uuid::Uuid)>,
     pending_user_or_tool_output_boundary: bool,
 }
 
@@ -94,6 +96,59 @@ impl CurrentTimeReminderState {
     }
 }
 
+impl Session {
+    pub(super) async fn read_clock_for_context(
+        &self,
+        turn_context: &TurnContext,
+        clock_read: &'static str,
+    ) -> CodexResult<Option<DateTime<Utc>>> {
+        let error = match self
+            .services
+            .time_provider
+            .current_time(self.thread_id)
+            .await
+        {
+            Ok(time) => return Ok(Some(time)),
+            Err(error) => error,
+        };
+        if !turn_context
+            .config
+            .features
+            .enabled(Feature::NonfatalClockReadErrors)
+        {
+            return Err(CodexErr::Fatal(format!(
+                "failed to read current time: {error:#}"
+            )));
+        }
+        tracing::error!(
+            clock_read,
+            thread_id = %self.thread_id,
+            turn_id = %turn_context.sub_id,
+            "failed to read current time; the clock provider may be stalled"
+        );
+        {
+            let mut state = self.state.lock().await;
+            let failure = (
+                turn_context.sub_id.clone(),
+                state.auto_compact_window_ids().window_id,
+            );
+            // A compacted window may no longer contain the earlier notice.
+            if state.current_time_reminder.last_clock_failure.as_ref() == Some(&failure) {
+                return Ok(None);
+            }
+            state.current_time_reminder.last_clock_failure = Some(failure);
+        }
+        let response_item = ContextualUserFragment::into(CurrentTimeUnavailable);
+        self.record_conversation_items(
+            turn_context,
+            turn_context.model_info(),
+            std::slice::from_ref(&response_item),
+        )
+        .await;
+        Ok(None)
+    }
+}
+
 pub(super) async fn maybe_record_current_time_reminder(
     sess: &Session,
     turn_context: &TurnContext,
@@ -110,12 +165,12 @@ pub(super) async fn maybe_record_current_time_reminder(
         return Ok(());
     };
 
-    let current_time = sess
-        .services
-        .time_provider
-        .current_time(sess.thread_id)
-        .await
-        .map_err(|err| CodexErr::Fatal(format!("failed to read current time: {err:#}")))?;
+    let Some(current_time) = sess
+        .read_clock_for_context(turn_context, "reminder")
+        .await?
+    else {
+        return Ok(());
+    };
 
     let reminder_is_due = {
         let mut state = sess.state.lock().await;
diff --git a/codex-rs/core/src/session/world_state.rs b/codex-rs/core/src/session/world_state.rs
index 74b1defa86..eae14ba44c 100644
--- a/codex-rs/core/src/session/world_state.rs
+++ b/codex-rs/core/src/session/world_state.rs
@@ -25,7 +25,6 @@ use crate::context::world_state::WorldState;
 use codex_connectors::AppToolPolicyEvaluator;
 use codex_extension_api::WorldStateContributionInput;
 use codex_features::Feature;
-use codex_protocol::error::CodexErr;
 use codex_protocol::error::Result as CodexResult;
 use codex_protocol::models::BaseInstructionsProvenance;
 
@@ -199,19 +198,19 @@ impl Session {
         }
         if turn_context.config.include_environment_context {
             let current_date = self
-                .services
-                .time_provider
-                .current_time(self.thread_id())
-                .await
-                .map_err(|err| CodexErr::Fatal(format!("failed to read current time: {err:#}")))?
-                .with_timezone(&chrono::Local)
-                .format("%Y-%m-%d")
-                .to_string();
+                .read_clock_for_context(turn_context, "environment_date")
+                .await?
+                .map(|current_time| {
+                    current_time
+                        .with_timezone(&chrono::Local)
+                        .format("%Y-%m-%d")
+                        .to_string()
+                });
             world_state.add_section(
                 EnvironmentsState::from_turn_context_with_environments(
                     turn_context,
                     &step_context.environments,
-                    Some(current_date),
+                    current_date,
                 )
                 .await
                 .with_subagents(environment_subagents),
diff --git a/codex-rs/core/src/tools/handlers/current_time.rs b/codex-rs/core/src/tools/handlers/current_time.rs
index 5d48896011..527701b963 100644
--- a/codex-rs/core/src/tools/handlers/current_time.rs
+++ b/codex-rs/core/src/tools/handlers/current_time.rs
@@ -1,5 +1,6 @@
 use crate::context::ContextualUserFragment;
 use crate::context::CurrentTimeReminder;
+use crate::context::CurrentTimeUnavailable;
 use crate::function_tool::FunctionCallError;
 use crate::tools::context::FunctionToolOutput;
 use crate::tools::context::ToolInvocation;
@@ -8,6 +9,7 @@ use crate::tools::context::ToolPayload;
 use crate::tools::context::boxed_tool_output;
 use crate::tools::registry::CoreToolRuntime;
 use crate::tools::registry::ToolExecutor;
+use codex_features::Feature;
 use codex_protocol::models::ResponseInputItem;
 use codex_tools::JsonSchema;
 use codex_tools::ResponsesApiNamespace;
@@ -98,7 +100,21 @@ impl ToolExecutor<ToolInvocation> for CurrentTimeHandler {
                 .current_time(invocation.session.thread_id)
                 .await
                 .map_err(|err| {
-                    FunctionCallError::Fatal(format!("failed to read current time: {err:#}"))
+                    if invocation
+                        .turn
+                        .config
+                        .features
+                        .enabled(Feature::NonfatalClockReadErrors)
+                    {
+                        tracing::error!(
+                            thread_id = %invocation.session.thread_id,
+                            turn_id = %invocation.turn.sub_id,
+                            "failed to read current time for the clock tool; the clock provider may be stalled"
+                        );
+                        FunctionCallError::RespondToModel(CurrentTimeUnavailable::MESSAGE.to_string())
+                    } else {
+                        FunctionCallError::Fatal(format!("failed to read current time: {err:#}"))
+                    }
                 })?;
             Ok(boxed_tool_output(CurrentTimeOutput(
                 CurrentTimeReminder::new(current_time),
diff --git a/codex-rs/core/src/tools/handlers/sleep.rs b/codex-rs/core/src/tools/handlers/sleep.rs
index 7defc8314b..45db1a3b57 100644
--- a/codex-rs/core/src/tools/handlers/sleep.rs
+++ b/codex-rs/core/src/tools/handlers/sleep.rs
@@ -1,3 +1,4 @@
+use crate::context::CurrentTimeUnavailable;
 use crate::function_tool::FunctionCallError;
 use crate::tools::context::FunctionToolOutput;
 use crate::tools::context::ToolInvocation;
@@ -8,6 +9,7 @@ use crate::tools::registry::CoreToolRuntime;
 use crate::tools::registry::ToolExecutor;
 use codex_extension_items::ExtensionItem;
 use codex_extension_items::sleep::SleepItem;
+use codex_features::Feature;
 use codex_protocol::items::TurnItem;
 use codex_tools::JsonSchema;
 use codex_tools::ResponsesApiNamespace;
@@ -111,7 +113,7 @@ impl ToolExecutor<ToolInvocation> for SleepHandler {
                 .input_queue
                 .subscribe_activity(turn_state.as_deref())
                 .await;
-            let sleep_result: Result<bool, FunctionCallError> = if pending_activity.is_some() {
+            let sleep_result = if pending_activity.is_some() {
                 Ok(true)
             } else {
                 let sleep = session
@@ -120,27 +122,29 @@ impl ToolExecutor<ToolInvocation> for SleepHandler {
                     .sleep(session.thread_id, Duration::from_millis(args.duration_ms));
                 tokio::pin!(sleep);
                 tokio::select! {
-                    result = &mut sleep => result
-                        .map(|()| false)
-                        .map_err(|err| {
-                            FunctionCallError::Fatal(format!("failed to sleep: {err:#}"))
-                        }),
+                    result = &mut sleep => result.map(|()| false),
                     result = activity_rx.changed() => {
                         if result.is_ok() {
                             Ok(true)
                         } else {
-                            sleep
-                                .await
-                                .map(|()| false)
-                                .map_err(|err| {
-                                    FunctionCallError::Fatal(format!("failed to sleep: {err:#}"))
-                                })
+                            sleep.await.map(|()| false)
                         }
                     }
                 }
             };
             session.emit_turn_item_completed(turn.as_ref(), item).await;
-            let interrupted = sleep_result?;
+            let interrupted = sleep_result.map_err(|err| {
+                if turn.config.features.enabled(Feature::NonfatalClockReadErrors) {
+                    tracing::error!(
+                        thread_id = %session.thread_id,
+                        turn_id = %turn.sub_id,
+                        "failed to read current time for the sleep tool; the clock provider may be stalled"
+                    );
+                    FunctionCallError::RespondToModel(CurrentTimeUnavailable::MESSAGE.to_string())
+                } else {
+                    FunctionCallError::Fatal(format!("failed to sleep: {err:#}"))
+                }
+            })?;
 
             let message = if interrupted {
                 "Sleep interrupted by new input."
diff --git a/codex-rs/core/tests/suite/current_time_reminder.rs b/codex-rs/core/tests/suite/current_time_reminder.rs
index e6ada23200..7e66fcaf40 100644
--- a/codex-rs/core/tests/suite/current_time_reminder.rs
+++ b/codex-rs/core/tests/suite/current_time_reminder.rs
@@ -31,6 +31,7 @@ use core_test_support::assert_regex_match;
 use core_test_support::responses::ResponsesRequest;
 use core_test_support::responses::ev_assistant_message;
 use core_test_support::responses::ev_completed;
+use core_test_support::responses::ev_completed_with_tokens;
 use core_test_support::responses::ev_function_call;
 use core_test_support::responses::ev_function_call_with_namespace;
 use core_test_support::responses::ev_response_created;
@@ -53,6 +54,8 @@ const SECOND_REMINDER: &str =
     "<current_time_reminder>It is 2026-06-17 17:35:15 UTC.</current_time_reminder>";
 const THIRD_REMINDER: &str =
     "<current_time_reminder>It is 2026-06-17 17:36:15 UTC.</current_time_reminder>";
+const CLOCK_UNAVAILABLE: &str =
+    "<current_time_unavailable>failed to read current time</current_time_unavailable>";
 const FIRST_TIME_UNIX_SECONDS: i64 = 1_781_717_655;
 
 #[derive(Clone, Copy)]
@@ -648,6 +651,86 @@ async fn time_provider_failure_stops_before_inference() -> Result<()> {
     Ok(())
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn opted_in_clock_failures_reach_the_model_without_aborting() -> Result<()> {
+    skip_if_no_network!(Ok(()));
+
+    const CALL_ID: &str = "failed-current-time";
+    let server = start_mock_server().await;
+    let responses = mount_sse_sequence(
+        &server,
+        vec![
+            sse(vec![
+                ev_response_created("resp-1"),
+                ev_function_call_with_namespace(CALL_ID, "clock", "curr_time", "{}"),
+                ev_completed_with_tokens("resp-1", /*total_tokens*/ 80),
+            ]),
+            sse(vec![
+                ev_response_created("resp-2"),
+                ev_function_call_with_namespace("clock-before-compact", "clock", "curr_time", "{}"),
+                ev_completed_with_tokens("resp-2", /*total_tokens*/ 500),
+            ]),
+            sse(vec![
+                ev_response_created("resp-compact"),
+                ev_assistant_message("msg-compact", "compact summary"),
+                ev_completed("resp-compact"),
+            ]),
+            sse(vec![
+                ev_response_created("resp-3"),
+                ev_completed_with_tokens("resp-3", /*total_tokens*/ 80),
+            ]),
+        ],
+    )
+    .await;
+    let mut model_provider = built_in_model_providers(/*openai_base_url*/ None)["openai"].clone();
+    model_provider.name = "OpenAI-compatible test provider".to_string();
+    model_provider.base_url = Some(format!("{}/v1", server.uri()));
+    model_provider.supports_websockets = false;
+    let test = test_codex()
+        .with_config(move |config| {
+            config.model_provider = model_provider;
+            config.model_auto_compact_token_limit = Some(200);
+            enable_current_time_reminder(config, /*interval*/ 0, CurrentTimeSource::External);
+            config.include_environment_context = true;
+            config
+                .features
+                .enable(Feature::NonfatalClockReadErrors)
+                .unwrap();
+        })
+        .with_external_time_provider(Arc::new(FailingTimeProvider))
+        .build_with_auto_env(&server)
+        .await?;
+
+    test.submit_turn("continue in a new context window").await?;
+
+    let requests = responses.requests();
+    assert_eq!(requests.len(), 4);
+    assert_eq!(
+        requests[1].function_call_output_text(CALL_ID),
+        Some("failed to read current time".to_string()),
+    );
+    for index in [0, 1, 3] {
+        let request = &requests[index];
+        let developer_messages = request.message_input_texts("developer");
+        assert_eq!(
+            developer_messages
+                .iter()
+                .map(|text| text.matches(CLOCK_UNAVAILABLE).count())
+                .sum::<usize>(),
+            1,
+            "request {index} developer messages: {developer_messages:?}",
+        );
+        assert!(current_time_reminders(request).is_empty());
+        assert!(
+            !request
+                .message_input_texts("user")
+                .iter()
+                .any(|text| text.contains("<current_date>"))
+        );
+    }
+    Ok(())
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn current_time_tool_returns_the_latest_time() -> Result<()> {
     skip_if_no_network!(Ok(()));
diff --git a/codex-rs/core/tests/suite/subagent_notifications.rs b/codex-rs/core/tests/suite/subagent_notifications.rs
index ac5e47f16c..bbd7113cf0 100644
--- a/codex-rs/core/tests/suite/subagent_notifications.rs
+++ b/codex-rs/core/tests/suite/subagent_notifications.rs
@@ -1623,8 +1623,14 @@ async fn spawned_full_history_v2_child_uses_model_precedence_without_dropping_co
                 .features
                 .enable(Feature::CurrentTimeReminder)
                 .expect("test config should allow feature update");
+            config
+                .features
+                .enable(Feature::NonfatalClockReadErrors)
+                .expect("test config should allow feature update");
+            config.include_environment_context = false;
             config.current_time_reminder = Some(CurrentTimeReminderConfig {
                 reminder_interval_seconds: 0,
+                clock_source: codex_features::CurrentTimeSource::External,
                 ..CurrentTimeReminderConfig::default()
             });
         }
@@ -1652,6 +1658,31 @@ async fn spawned_full_history_v2_child_uses_model_precedence_without_dropping_co
     if matches!(selection, FullHistoryV2ModelSelection::WorldStateIdentity) {
         builder = builder.with_history_mode(ThreadHistoryMode::Paginated);
     }
+    if matches!(selection, FullHistoryV2ModelSelection::CurrentTimeReminders) {
+        #[derive(Default)]
+        struct FailFirstClockRead(std::sync::atomic::AtomicBool);
+
+        impl codex_core::TimeProvider for FailFirstClockRead {
+            fn current_time(&self, _thread_id: ThreadId) -> codex_core::TimeFuture<'_> {
+                let already_read = self.0.swap(true, std::sync::atomic::Ordering::Relaxed);
+                Box::pin(async move {
+                    anyhow::ensure!(already_read, "parent clock unavailable");
+                    Ok(chrono::Utc::now())
+                })
+            }
+
+            fn sleep(
+                &self,
+                _thread_id: ThreadId,
+                _duration: Duration,
+            ) -> codex_core::SleepFuture<'_> {
+                Box::pin(async { Ok(()) })
+            }
+        }
+
+        builder =
+            builder.with_external_time_provider(std::sync::Arc::new(FailFirstClockRead::default()));
+    }
     let test = builder.build(&server).await?;
     if matches!(selection, FullHistoryV2ModelSelection::WorldStateIdentity) {
         test.codex.submit(Op::Compact).await?;
@@ -1806,15 +1837,23 @@ async fn spawned_full_history_v2_child_uses_model_precedence_without_dropping_co
         );
     }
     if matches!(selection, FullHistoryV2ModelSelection::CurrentTimeReminders) {
-        let reminder_count = |request: &ResponsesRequest| {
+        let notice_count = |request: &ResponsesRequest, marker: &str| {
             request
                 .message_input_texts("developer")
                 .into_iter()
-                .filter(|text| text.starts_with("<current_time_reminder>"))
+                .filter(|text| text.starts_with(marker))
                 .count()
         };
-        assert_eq!(reminder_count(&parent_request), 2);
-        assert_eq!(reminder_count(&child_request), 1);
+        assert_eq!(
+            notice_count(&parent_request, "<current_time_unavailable>"),
+            1
+        );
+        assert_eq!(notice_count(&parent_request, "<current_time_reminder>"), 1);
+        assert_eq!(
+            notice_count(&child_request, "<current_time_unavailable>"),
+            0
+        );
+        assert_eq!(notice_count(&child_request, "<current_time_reminder>"), 1);
     }
     let child_body = child_request.body_json();
     if matches!(selection, FullHistoryV2ModelSelection::WorldStateIdentity) {
diff --git a/codex-rs/features/src/lib.rs b/codex-rs/features/src/lib.rs
index b6355c2d8f..557a9dfb17 100644
--- a/codex-rs/features/src/lib.rs
+++ b/codex-rs/features/src/lib.rs
@@ -338,6 +338,8 @@ pub enum Feature {
     ReasoningEffortOverride,
     /// Add current-time reminders to model-visible context.
     CurrentTimeReminder,
+    /// Report failed clock reads to the model without failing the turn.
+    NonfatalClockReadErrors,
     /// Route MCP tool approval prompts through the MCP elicitation request path.
     ToolCallMcpElicitation,
     /// Prompt Codex Apps connector auth failures through MCP URL elicitations.
@@ -1661,6 +1663,12 @@ pub const FEATURES: &[FeatureSpec] = &[
         stage: Stage::UnderDevelopment,
         default_enabled: false,
     },
+    FeatureSpec {
+        id: Feature::NonfatalClockReadErrors,
+        key: "nonfatal_clock_read_errors",
+        stage: Stage::UnderDevelopment,
+        default_enabled: false,
+    },
     FeatureSpec {
         id: Feature::CollaborationModes,
         key: "collaboration_modes",