merge: session task reminders

crates/pod/src/ipc/interceptor.rs

@@ -23,6 +23,7 @@ use tracing::warn;
 
 use crate::compact::state::CompactState;
 use session_store::SystemItem;
+use tools::{TaskEntry, TaskStatus, TaskStore};
 
 use crate::hook::{
     AbortInfo, HookPromptAction, HookRegistry, PreRequestInfo, PromptSubmitInfo, ToolCallSummary,
@@ -36,6 +37,53 @@ use llm_worker::token_counter::total_tokens;
 /// Maximum number of bytes copied into `TurnEndInfo::final_text_preview`.
 const FINAL_TEXT_PREVIEW_LIMIT: usize = 512;
 
+const TASK_REMINDER_REQUEST_THRESHOLD: usize = 8;
+const TASK_REMINDER_COOLDOWN_REQUESTS: usize = 8;
+const TASK_MANAGEMENT_TOOL_NAMES: [&str; 2] = ["TaskCreate", "TaskUpdate"];
+
+#[derive(Debug)]
+pub(crate) struct TaskReminderState {
+    requests_since_last_task_management: AtomicUsize,
+    requests_since_last_reminder: AtomicUsize,
+}
+
+impl Default for TaskReminderState {
+    fn default() -> Self {
+        Self {
+            requests_since_last_task_management: AtomicUsize::new(0),
+            requests_since_last_reminder: AtomicUsize::new(TASK_REMINDER_COOLDOWN_REQUESTS),
+        }
+    }
+}
+
+impl TaskReminderState {
+    pub(crate) fn new() -> Self {
+        Self::default()
+    }
+
+    fn note_request(&self) -> (usize, usize) {
+        let since_task_management = self
+            .requests_since_last_task_management
+            .fetch_add(1, Ordering::Relaxed)
+            .saturating_add(1);
+        let since_reminder = self
+            .requests_since_last_reminder
+            .fetch_add(1, Ordering::Relaxed)
+            .saturating_add(1);
+        (since_task_management, since_reminder)
+    }
+
+    fn note_task_management(&self) {
+        self.requests_since_last_task_management
+            .store(0, Ordering::Relaxed);
+    }
+
+    fn note_reminder(&self) {
+        self.requests_since_last_reminder
+            .store(0, Ordering::Relaxed);
+    }
+}
+
 pub(crate) struct PodInterceptor {
     registry: Arc<HookRegistry>,
     compact_state: Option<Arc<CompactState>>,
@@ -55,7 +103,12 @@ pub(crate) struct PodInterceptor {
     /// `PromptAction::ContinueWith`. Populated by `Pod::run`
     /// immediately before handing off to the worker.
     pending_attachments: Arc<Mutex<Vec<SystemItem>>>,
-    /// Prompt catalog used to render the injected notification wrapper.
+    /// Task state observed by built-in task tools. Used to nudge the main
+    /// worker when active tasks have gone unmentioned for several requests.
+    task_store: TaskStore,
+    task_reminder_state: Arc<TaskReminderState>,
+    /// Prompt catalog used to render pending notification entries into the
+    /// same system-message text that will be persisted in history.
     prompts: Arc<PromptCatalog>,
     /// Type-erased commit handle. The interceptor uses it to commit
     /// `LogEntry::SystemItem` entries directly (sync) before
@@ -76,6 +129,8 @@ impl PodInterceptor {
         usage_history: Option<Arc<Mutex<Vec<UsageRecord>>>>,
         pending_notifies: NotifyBuffer,
         pending_attachments: Arc<Mutex<Vec<SystemItem>>>,
+        task_store: TaskStore,
+        task_reminder_state: Arc<TaskReminderState>,
         prompts: Arc<PromptCatalog>,
         log_writer: Option<Arc<dyn SystemItemCommitter>>,
     ) -> Self {
@@ -85,6 +140,8 @@ impl PodInterceptor {
             usage_history,
             pending_notifies,
             pending_attachments,
+            task_store,
+            task_reminder_state,
             prompts,
             log_writer,
             next_turn_index: AtomicUsize::new(0),
@@ -121,6 +178,48 @@ impl PodInterceptor {
         let records = handle.lock().expect("usage_history poisoned").clone();
         Some(total_tokens(context, &records).tokens)
     }
+
+    fn task_reminder_system_item(&self) -> Option<SystemItem> {
+        let active_tasks: Vec<TaskEntry> = self
+            .task_store
+            .list()
+            .into_iter()
+            .filter(|task| matches!(task.status, TaskStatus::Pending | TaskStatus::Inprogress))
+            .collect();
+        if active_tasks.is_empty() {
+            return None;
+        }
+
+        let (since_task_management, since_reminder) = self.task_reminder_state.note_request();
+        if since_task_management < TASK_REMINDER_REQUEST_THRESHOLD
+            || since_reminder < TASK_REMINDER_COOLDOWN_REQUESTS
+        {
+            return None;
+        }
+
+        self.task_reminder_state.note_reminder();
+        Some(SystemItem::TaskReminder {
+            body: render_task_reminder(&active_tasks),
+        })
+    }
+}
+
+fn is_task_management_tool(name: &str) -> bool {
+    TASK_MANAGEMENT_TOOL_NAMES.contains(&name)
+}
+
+fn render_task_reminder(active_tasks: &[TaskEntry]) -> String {
+    let mut body = String::from(
+        "<system-reminder>\nActive session tasks are still open. If progress changed, call TaskUpdate.\n",
+    );
+    for task in active_tasks {
+        body.push_str(&format!(
+            "- taskid {} ({}) {}\n",
+            task.taskid, task.status, task.subject
+        ));
+    }
+    body.push_str("</system-reminder>");
+    body
 }
 
 #[async_trait]
@@ -161,11 +260,13 @@ impl Interceptor for PodInterceptor {
 
     async fn pending_history_appends(&self) -> Vec<Item> {
         let drained = self.pending_notifies.drain();
-        if drained.is_empty() {
+        let task_reminder = self.task_reminder_system_item();
+        if drained.is_empty() && task_reminder.is_none() {
             return Vec::new();
         }
-        let mut system_items: Vec<SystemItem> = Vec::with_capacity(drained.len());
-        let mut items: Vec<Item> = Vec::with_capacity(drained.len());
+
+        let mut system_items: Vec<SystemItem> = Vec::with_capacity(drained.len() + 1);
+        let mut items: Vec<Item> = Vec::with_capacity(drained.len() + 1);
         for entry in drained {
             match build_system_item(&entry, &self.prompts) {
                 Ok(system_item) => {
@@ -188,6 +289,10 @@ impl Interceptor for PodInterceptor {
                 }
             }
         }
+        if let Some(system_item) = task_reminder {
+            items.push(system_item.to_history_item());
+            system_items.push(system_item);
+        }
         self.commit_system_items(&system_items);
         items
     }
@@ -237,6 +342,9 @@ impl Interceptor for PodInterceptor {
                 return action;
             }
         }
+        if is_task_management_tool(&info.call.name) {
+            self.task_reminder_state.note_task_management();
+        }
         self.tool_calls_this_turn.fetch_add(1, Ordering::Relaxed);
         PreToolAction::Continue
     }
@@ -333,12 +441,51 @@ mod tests {
         }
     }
 
-    fn registry_with_pre_llm_hook(counter: Arc<AtomicUsize>) -> Arc<HookRegistry> {
+    fn registry_with_pre_llm_hook(count: Arc<AtomicUsize>) -> Arc<HookRegistry> {
         let mut builder = HookRegistryBuilder::new();
-        builder.add_pre_llm_request(CountingHook(counter));
+        builder.add_pre_llm_request(CountingHook(count));
         Arc::new(builder.build())
     }
 
+    fn interceptor_for_task_reminders(
+        task_store: TaskStore,
+        task_reminder_state: Arc<TaskReminderState>,
+    ) -> PodInterceptor {
+        PodInterceptor::new(
+            Arc::new(HookRegistryBuilder::new().build()),
+            None,
+            None,
+            NotifyBuffer::new(),
+            Arc::new(Mutex::new(Vec::new())),
+            task_store,
+            task_reminder_state,
+            PromptCatalog::builtins_only().unwrap(),
+            None,
+        )
+    }
+
+    async fn call_pre_tool(interceptor: &PodInterceptor, name: &str) {
+        let def = tools::task_tools(TaskStore::new())
+            .into_iter()
+            .find(|def| {
+                let (meta, _) = def();
+                meta.name == name
+            })
+            .expect("task tool definition");
+        let (meta, tool) = def();
+        let mut info = ToolCallInfo {
+            call: llm_worker::tool::ToolCall {
+                id: "call-id".into(),
+                name: name.into(),
+                input: serde_json::json!({}),
+            },
+            meta,
+            tool,
+        };
+        let action = interceptor.pre_tool_call(&mut info).await;
+        assert!(matches!(action, PreToolAction::Continue));
+    }
+
     /// Build a usage_history handle with a single record pinned at the
     /// current `context_len` so that `total_tokens` returns exactly
     /// `tokens` (Measured, no interpolation or byte-based fallback).
@@ -367,6 +514,8 @@ mod tests {
             Some(history),
             NotifyBuffer::new(),
             Arc::new(Mutex::new(Vec::new())),
+            TaskStore::new(),
+            Arc::new(TaskReminderState::new()),
             PromptCatalog::builtins_only().unwrap(),
             None,
         );
@@ -393,6 +542,8 @@ mod tests {
             Some(history),
             NotifyBuffer::new(),
             Arc::new(Mutex::new(Vec::new())),
+            TaskStore::new(),
+            Arc::new(TaskReminderState::new()),
             PromptCatalog::builtins_only().unwrap(),
             None,
         );
@@ -420,6 +571,8 @@ mod tests {
             Some(history),
             NotifyBuffer::new(),
             Arc::new(Mutex::new(Vec::new())),
+            TaskStore::new(),
+            Arc::new(TaskReminderState::new()),
             PromptCatalog::builtins_only().unwrap(),
             None,
         );
@@ -441,6 +594,8 @@ mod tests {
             None,
             NotifyBuffer::new(),
             Arc::new(Mutex::new(Vec::new())),
+            TaskStore::new(),
+            Arc::new(TaskReminderState::new()),
             PromptCatalog::builtins_only().unwrap(),
             None,
         );
@@ -474,6 +629,8 @@ mod tests {
             None,
             buffer.clone(),
             Arc::new(Mutex::new(Vec::new())),
+            TaskStore::new(),
+            Arc::new(TaskReminderState::new()),
             PromptCatalog::builtins_only().unwrap(),
             None,
         );
@@ -496,6 +653,150 @@ mod tests {
         assert!(again.is_empty());
     }
 
+    #[tokio::test]
+    async fn task_reminder_appends_after_inactive_request_threshold() {
+        let task_store = TaskStore::new();
+        task_store.create("keep going".into(), "long task description".into());
+        let interceptor =
+            interceptor_for_task_reminders(task_store, Arc::new(TaskReminderState::new()));
+
+        for _ in 0..TASK_REMINDER_REQUEST_THRESHOLD - 1 {
+            assert!(interceptor.pending_history_appends().await.is_empty());
+        }
+        let items = interceptor.pending_history_appends().await;
+        assert_eq!(items.len(), 1);
+        let body = items[0].as_text().unwrap_or_default();
+        assert!(body.contains("<system-reminder>"));
+        assert!(body.contains("</system-reminder>"));
+        assert!(body.contains("taskid 1"));
+        assert!(body.contains("pending"));
+        assert!(body.contains("keep going"));
+        assert!(!body.contains("long task description"));
+    }
+
+    #[test]
+    fn task_reminder_state_starts_with_initial_cooldown_elapsed() {
+        let state = TaskReminderState::new();
+
+        assert_eq!(
+            state.requests_since_last_reminder.load(Ordering::Relaxed),
+            TASK_REMINDER_COOLDOWN_REQUESTS
+        );
+        assert_eq!(
+            state
+                .requests_since_last_task_management
+                .load(Ordering::Relaxed),
+            0
+        );
+    }
+
+    #[tokio::test]
+    async fn task_management_tool_call_resets_reminder_inactivity_counter() {
+        let task_store = TaskStore::new();
+        task_store.create("track me".into(), String::new());
+        let interceptor =
+            interceptor_for_task_reminders(task_store, Arc::new(TaskReminderState::new()));
+
+        for _ in 0..TASK_REMINDER_REQUEST_THRESHOLD - 1 {
+            assert!(interceptor.pending_history_appends().await.is_empty());
+        }
+        call_pre_tool(&interceptor, "TaskUpdate").await;
+
+        for _ in 0..TASK_REMINDER_REQUEST_THRESHOLD - 1 {
+            assert!(interceptor.pending_history_appends().await.is_empty());
+        }
+        assert_eq!(interceptor.pending_history_appends().await.len(), 1);
+    }
+
+    #[tokio::test]
+    async fn task_reminder_respects_cooldown_after_reminder() {
+        let task_store = TaskStore::new();
+        task_store.create("cooldown".into(), String::new());
+        let interceptor =
+            interceptor_for_task_reminders(task_store, Arc::new(TaskReminderState::new()));
+
+        for _ in 0..TASK_REMINDER_REQUEST_THRESHOLD {
+            let _ = interceptor.pending_history_appends().await;
+        }
+        for _ in 0..TASK_REMINDER_COOLDOWN_REQUESTS - 1 {
+            assert!(interceptor.pending_history_appends().await.is_empty());
+        }
+        assert_eq!(interceptor.pending_history_appends().await.len(), 1);
+    }
+
+    #[tokio::test]
+    async fn task_reminder_is_silent_when_no_active_tasks_exist() {
+        let task_store = TaskStore::new();
+        let done = task_store.create("done".into(), String::new()).taskid;
+        task_store
+            .update(done, Some(TaskStatus::Completed), None, None)
+            .expect("complete task");
+        let interceptor =
+            interceptor_for_task_reminders(task_store, Arc::new(TaskReminderState::new()));
+
+        for _ in 0..TASK_REMINDER_REQUEST_THRESHOLD * 2 {
+            assert!(interceptor.pending_history_appends().await.is_empty());
+        }
+    }
+
+    #[tokio::test]
+    async fn inactive_requests_without_active_tasks_do_not_prime_task_reminder() {
+        let task_store = TaskStore::new();
+        let interceptor =
+            interceptor_for_task_reminders(task_store.clone(), Arc::new(TaskReminderState::new()));
+
+        for _ in 0..TASK_REMINDER_REQUEST_THRESHOLD * 2 {
+            assert!(interceptor.pending_history_appends().await.is_empty());
+        }
+
+        task_store.create("new active".into(), String::new());
+        for _ in 0..TASK_REMINDER_REQUEST_THRESHOLD - 1 {
+            assert!(interceptor.pending_history_appends().await.is_empty());
+        }
+        assert_eq!(interceptor.pending_history_appends().await.len(), 1);
+    }
+
+    #[tokio::test]
+    async fn task_create_reset_does_not_block_first_reminder_cooldown() {
+        let task_store = TaskStore::new();
+        let state = Arc::new(TaskReminderState::new());
+        let interceptor = interceptor_for_task_reminders(task_store.clone(), state.clone());
+
+        for _ in 0..TASK_REMINDER_REQUEST_THRESHOLD * 2 {
+            assert!(interceptor.pending_history_appends().await.is_empty());
+        }
+
+        call_pre_tool(&interceptor, "TaskCreate").await;
+        task_store.create("created after idle".into(), String::new());
+        assert_eq!(
+            state.requests_since_last_reminder.load(Ordering::Relaxed),
+            TASK_REMINDER_COOLDOWN_REQUESTS,
+            "TaskCreate reset must not clear the initial reminder cooldown"
+        );
+
+        for _ in 0..TASK_REMINDER_REQUEST_THRESHOLD - 1 {
+            assert!(interceptor.pending_history_appends().await.is_empty());
+        }
+        assert_eq!(interceptor.pending_history_appends().await.len(), 1);
+    }
+
+    #[tokio::test]
+    async fn task_reminder_lands_in_pending_history_appends_lane() {
+        let task_store = TaskStore::new();
+        task_store.create("lane".into(), String::new());
+        let interceptor =
+            interceptor_for_task_reminders(task_store, Arc::new(TaskReminderState::new()));
+        let mut ctx = vec![Item::user_message("hi")];
+
+        for _ in 0..TASK_REMINDER_REQUEST_THRESHOLD {
+            let _ = interceptor.pending_history_appends().await;
+        }
+        let action = interceptor.pre_llm_request(&mut ctx).await;
+
+        assert!(matches!(action, PreRequestAction::Continue));
+        assert_eq!(ctx.len(), 1, "pre_llm_request must not inject reminders");
+    }
+
     #[tokio::test]
     async fn pre_llm_request_does_not_touch_pending_notifies() {
         // The drain lane has moved to `pending_history_appends`;
@@ -511,6 +812,8 @@ mod tests {
             None,
             buffer.clone(),
             Arc::new(Mutex::new(Vec::new())),
+            TaskStore::new(),
+            Arc::new(TaskReminderState::new()),
             PromptCatalog::builtins_only().unwrap(),
             None,
         );
@@ -541,6 +844,8 @@ mod tests {
             None,
             NotifyBuffer::new(),
             Arc::new(Mutex::new(Vec::new())),
+            TaskStore::new(),
+            Arc::new(TaskReminderState::new()),
             PromptCatalog::builtins_only().unwrap(),
             None,
         );

crates/pod/src/pod.rs

@@ -29,7 +29,7 @@ use crate::hook::{
     PreRequestInfo, PreToolCall,
 };
 use crate::ipc::alerter::Alerter;
-use crate::ipc::interceptor::PodInterceptor;
+use crate::ipc::interceptor::{PodInterceptor, TaskReminderState};
 use crate::ipc::notify_buffer::NotifyBuffer;
 use crate::prompt::agents_md::read_agents_md;
 use crate::prompt::catalog::{CatalogError, PromptCatalog};
@@ -272,6 +272,10 @@ pub struct Pod<C: LlmClient, St: Store> {
     /// compaction by keeping the same handle while the Worker history is
     /// replaced. Restored Pods reconstruct it by replaying Task* tool calls.
     task_store: tools::TaskStore,
+    /// Session-lifetime counters for active-Task reminder nudges.
+    /// Restored Pods start these at zero; the only consequence is a delayed
+    /// first reminder after resume.
+    task_reminder_state: Arc<TaskReminderState>,
     /// Parsed system-prompt template awaiting first-turn materialisation.
     /// `Some` until `ensure_system_prompt_materialized` renders it once,
     /// then `None` forever — including after compaction.
@@ -431,6 +435,7 @@ impl<C: LlmClient + Clone + 'static, St: Store + Clone + 'static> Pod<C, St> {
             usage_history: self.usage_history.clone(),
             tracker: None,
             task_store: self.task_store.clone(),
+            task_reminder_state: self.task_reminder_state.clone(),
             system_prompt_template: None,
             alerter: self.alerter.clone(),
             event_tx: self.event_tx.clone(),
@@ -610,6 +615,7 @@ impl<C: LlmClient, St: Store> Pod<C, St> {
             usage_history: Arc::new(Mutex::new(Vec::<UsageRecord>::new())),
             tracker: None,
             task_store: tools::TaskStore::new(),
+            task_reminder_state: Arc::new(TaskReminderState::new()),
             system_prompt_template: None,
             alerter: None,
             event_tx: None,
@@ -1260,6 +1266,8 @@ impl<C: LlmClient, St: Store> Pod<C, St> {
                 usage_history_handle,
                 self.pending_notifies.clone(),
                 self.pending_attachments.clone(),
+                self.task_store.clone(),
+                self.task_reminder_state.clone(),
                 self.prompts.clone(),
                 self.log_writer.clone(),
             );
@@ -3797,6 +3805,7 @@ where
             usage_history: Arc::new(Mutex::new(Vec::new())),
             tracker: None,
             task_store: tools::TaskStore::new(),
+            task_reminder_state: Arc::new(TaskReminderState::new()),
             system_prompt_template: common.system_prompt_template,
             alerter: None,
             event_tx: None,
@@ -3876,6 +3885,7 @@ where
             usage_history: Arc::new(Mutex::new(Vec::new())),
             tracker: None,
             task_store: tools::TaskStore::new(),
+            task_reminder_state: Arc::new(TaskReminderState::new()),
             system_prompt_template: common.system_prompt_template,
             alerter: None,
             event_tx: None,
@@ -4052,6 +4062,7 @@ where
             usage_history: Arc::new(Mutex::new(state.usage_history)),
             tracker: None,
             task_store,
+            task_reminder_state: Arc::new(TaskReminderState::new()),
             // Restore replays the saved system_prompt verbatim — no
             // template re-render on resume.
             system_prompt_template: None,

crates/session-store/src/system_item.rs

@@ -35,7 +35,7 @@ use serde::{Deserialize, Serialize};
 /// resume.
 ///
 /// New variants get added here as fresh injection kinds come online
-/// (e.g. `Reminder`). The `kind` JSON tag is the snake_case form of
+/// (e.g. `TaskReminder`). The `kind` JSON tag is the snake_case form of
 /// the variant name.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(tag = "kind", rename_all = "snake_case")]
@@ -68,6 +68,11 @@ pub enum SystemItem {
     /// prompt body materialized into the LLM context.
     Workflow { slug: String, body: String },
 
+    /// Task-management inactivity reminder inserted before an LLM request.
+    /// `body` is the exact LLM-context text wrapped in a
+    /// `<system-reminder>` block.
+    TaskReminder { body: String },
+
     /// Synthetic note inserted after an interrupted turn before the next
     /// user input. `body` is the exact LLM-context text explaining that the
     /// previous turn was cut short.
@@ -84,6 +89,7 @@ impl SystemItem {
             SystemItem::FileAttachment { body, .. } => body.clone(),
             SystemItem::Knowledge { body, .. } => body.clone(),
             SystemItem::Workflow { body, .. } => body.clone(),
+            SystemItem::TaskReminder { body } => body.clone(),
             SystemItem::Interrupt { body } => body.clone(),
         }
     }
@@ -103,6 +109,7 @@ impl SystemItem {
             SystemItem::FileAttachment { .. } => "file_attachment",
             SystemItem::Knowledge { .. } => "knowledge",
             SystemItem::Workflow { .. } => "workflow",
+            SystemItem::TaskReminder { .. } => "task_reminder",
             SystemItem::Interrupt { .. } => "interrupt",
         }
     }