[codex] nest sleep config under current time reminder (#29910)

## Summary

- move sleep tool enablement from top-level `[features].sleep_tool` to
`[features.current_time_reminder].sleep_tool`
- remove the standalone `Feature::SleepTool` flag and gate `clock.sleep`
from resolved current-time configuration
- update config schema, config-lock materialization, and existing sleep
coverage

Stacked on #29907.

codex-rs/app-server/tests/suite/v2/sleep.rs

@@ -167,7 +167,8 @@ wire_api = "responses"
 request_max_retries = 0
 stream_max_retries = 0
 
-[features]
+[features.current_time_reminder]
+enabled = true
 sleep_tool = true
 "#
         ),

codex-rs/core/config.schema.json

@@ -643,9 +643,6 @@
             "skill_mcp_dependency_install": {
               "type": "boolean"
             },
-            "sleep_tool": {
-              "type": "boolean"
-            },
             "sqlite": {
               "type": "boolean"
             },
@@ -820,6 +817,10 @@
           "format": "uint64",
           "minimum": 1.0,
           "type": "integer"
+        },
+        "sleep_tool": {
+          "description": "Expose the input-interruptible `clock.sleep` tool.",
+          "type": "boolean"
         }
       },
       "type": "object"
@@ -4951,9 +4952,6 @@
         "skill_mcp_dependency_install": {
           "type": "boolean"
         },
-        "sleep_tool": {
-          "type": "boolean"
-        },
         "sqlite": {
           "type": "boolean"
         },

codex-rs/core/src/config/config_tests.rs

@@ -623,10 +623,12 @@ current_time_reminder = true
 enabled = true
 reminder_interval_seconds = 4
 clock_source = "external"
+sleep_tool = true
 "#,
             CurrentTimeReminderConfig {
                 reminder_interval_seconds: 4,
                 clock_source: CurrentTimeSource::External,
+                sleep_tool: true,
             },
         ),
     ] {

codex-rs/core/src/config/mod.rs

@@ -1037,7 +1037,7 @@ pub struct Config {
     pub token_budget: Option<TokenBudgetConfig>,
     /// Shared token budget for the root thread and its sub-agents.
     pub rollout_budget: Option<RolloutBudgetConfig>,
-    /// Current-time reminder configuration, when enabled.
+    /// Current-time reminder and clock tool configuration, when enabled.
     pub current_time_reminder: Option<CurrentTimeReminderConfig>,
 
     /// Centralized feature flags; source of truth for feature gating.
@@ -1117,6 +1117,8 @@ pub struct RolloutBudgetConfig {
 pub struct CurrentTimeReminderConfig {
     pub reminder_interval_seconds: u64,
     pub clock_source: CurrentTimeSource,
+    /// Whether to expose the input-interruptible `clock.sleep` tool.
+    pub sleep_tool: bool,
 }
 
 impl Default for CurrentTimeReminderConfig {
@@ -1124,6 +1126,7 @@ impl Default for CurrentTimeReminderConfig {
         Self {
             reminder_interval_seconds: 1,
             clock_source: CurrentTimeSource::System,
+            sleep_tool: false,
         }
     }
 }
@@ -2675,6 +2678,9 @@ fn resolve_current_time_reminder_config(
         clock_source: base
             .and_then(|config| config.clock_source)
             .unwrap_or(default.clock_source),
+        sleep_tool: base
+            .and_then(|config| config.sleep_tool)
+            .unwrap_or(default.sleep_tool),
     }))
 }
 

codex-rs/core/src/session/config_lock.rs

@@ -359,6 +359,7 @@ mod tests {
                 enabled: Some(true),
                 reminder_interval_seconds: Some(1),
                 clock_source: Some(codex_features::CurrentTimeSource::System),
+                sleep_tool: Some(false),
             }))
         );
 

codex-rs/core/src/tools/spec_plan.rs

@@ -744,10 +744,14 @@ fn add_core_utility_tools(context: &CoreToolPlanContext<'_>, planned_tools: &mut
 
     if features.enabled(Feature::CurrentTimeReminder) {
         planned_tools.add(CurrentTimeHandler);
-    }
-
-    if features.enabled(Feature::SleepTool) {
-        planned_tools.add(SleepHandler);
+        if turn_context
+            .config
+            .current_time_reminder
+            .as_ref()
+            .is_some_and(|config| config.sleep_tool)
+        {
+            planned_tools.add(SleepHandler);
+        }
     }
 
     if tool_suggest_enabled(turn_context)

codex-rs/core/src/tools/spec_plan_tests.rs

@@ -31,6 +31,7 @@ use codex_tools::ToolSpec;
 use pretty_assertions::assert_eq;
 use serde_json::json;
 
+use crate::config::CurrentTimeReminderConfig;
 use crate::session::step_context::StepContext;
 use crate::session::tests::make_session_and_context;
 use crate::session::turn_context::TurnContext;
@@ -721,19 +722,27 @@ async fn host_context_gates_agent_job_tools() {
 }
 
 #[tokio::test]
-async fn sleep_tool_follows_feature_gate() {
+async fn sleep_tool_follows_current_time_config() {
     let disabled = probe(|turn| {
-        set_feature(turn, Feature::SleepTool, /*enabled*/ false);
+        set_feature(turn, Feature::CurrentTimeReminder, /*enabled*/ true);
     })
     .await;
-    disabled.assert_visible_lacks(&["clock"]);
+    assert_eq!(disabled.namespace_function_names("clock"), ["curr_time"]);
 
     let enabled = probe(|turn| {
-        set_feature(turn, Feature::SleepTool, /*enabled*/ true);
+        set_feature(turn, Feature::CurrentTimeReminder, /*enabled*/ true);
+        let mut config = (*turn.config).clone();
+        config.current_time_reminder = Some(CurrentTimeReminderConfig {
+            sleep_tool: true,
+            ..CurrentTimeReminderConfig::default()
+        });
+        turn.config = Arc::new(config);
     })
     .await;
-    enabled.assert_visible_contains(&["clock"]);
-    assert_eq!(enabled.namespace_function_names("clock"), ["sleep"]);
+    assert_eq!(
+        enabled.namespace_function_names("clock"),
+        ["curr_time", "sleep"]
+    );
 }
 
 #[tokio::test]

codex-rs/core/tests/suite/code_mode.rs

@@ -883,6 +883,7 @@ text(JSON.stringify(result));
             config.current_time_reminder = Some(CurrentTimeReminderConfig {
                 reminder_interval_seconds: 3_000,
                 clock_source: CurrentTimeSource::System,
+                ..CurrentTimeReminderConfig::default()
             });
         },
     )

codex-rs/core/tests/suite/current_time_reminder.rs

@@ -86,6 +86,7 @@ fn enable_current_time_reminder(
     config.current_time_reminder = Some(CurrentTimeReminderConfig {
         reminder_interval_seconds: interval,
         clock_source,
+        ..CurrentTimeReminderConfig::default()
     });
 }
 

codex-rs/core/tests/suite/pending_input.rs

@@ -2,6 +2,7 @@ use core_test_support::test_codex::local_selections;
 use std::sync::Arc;
 
 use codex_core::CodexThread;
+use codex_core::config::CurrentTimeReminderConfig;
 use codex_features::Feature;
 use codex_protocol::AgentPath;
 use codex_protocol::items::SleepItem;
@@ -390,8 +391,12 @@ async fn any_new_input_interrupts_sleep() {
         .with_config(|config| {
             config
                 .features
-                .enable(Feature::SleepTool)
-                .expect("test config should allow feature update");
+                .enable(Feature::CurrentTimeReminder)
+                .expect("test config should allow current-time reminders");
+            config.current_time_reminder = Some(CurrentTimeReminderConfig {
+                sleep_tool: true,
+                ..CurrentTimeReminderConfig::default()
+            });
         })
         .build_with_streaming_server(&server)
         .await

codex-rs/features/src/feature_configs.rs

@@ -147,6 +147,9 @@ pub struct CurrentTimeReminderConfigToml {
     pub reminder_interval_seconds: Option<u64>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub clock_source: Option<CurrentTimeSource>,
+    /// Expose the input-interruptible `clock.sleep` tool.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub sleep_tool: Option<bool>,
 }
 
 impl FeatureConfig for CurrentTimeReminderConfigToml {

codex-rs/features/src/lib.rs

@@ -219,8 +219,6 @@ pub enum Feature {
     RolloutBudget,
     /// Add current-time reminders to model-visible context.
     CurrentTimeReminder,
-    /// Expose an input-interruptible sleep tool.
-    SleepTool,
     /// Route MCP tool approval prompts through the MCP elicitation request path.
     ToolCallMcpElicitation,
     /// Prompt Codex Apps connector auth failures through MCP URL elicitations.
@@ -1243,12 +1241,6 @@ pub const FEATURES: &[FeatureSpec] = &[
         stage: Stage::UnderDevelopment,
         default_enabled: false,
     },
-    FeatureSpec {
-        id: Feature::SleepTool,
-        key: "sleep_tool",
-        stage: Stage::UnderDevelopment,
-        default_enabled: false,
-    },
     FeatureSpec {
         id: Feature::CollaborationModes,
         key: "collaboration_modes",