docs(langchain): add time trigger interrupts

docs/human_in_the_loop.md

@@ -468,6 +468,32 @@ For a practical implementation, refer to the [email-triage-agent sample](https:/
 
 ---
 
+## Time triggers
+
+### WaitTimeTrigger
+
+Suspends the agent until an Orchestrator timer fires. The SDK stores the resume timestamp as part of the resume condition, and Orchestrator resumes the suspended job when that time is reached.
+
+| Attribute | Type | Description |
+| --- | --- | --- |
+| `resume_time` | `datetime \| str` | Absolute time when Orchestrator should resume the suspended job. Use a timezone-aware UTC `datetime` or an ISO 8601 timestamp. |
+
+```python
+from langgraph.types import interrupt
+from uipath.platform.common import WaitTimeTrigger
+from datetime import datetime, timedelta, timezone
+
+resume_payload = interrupt(
+    WaitTimeTrigger(
+        resume_time=datetime.now(timezone.utc) + timedelta(minutes=5),
+    )
+)
+```
+
+This is intended for deployed jobs where Orchestrator owns the scheduler. In a local run there is no scheduler to fire the time trigger, so resume the interrupt explicitly when testing locally.
+
+---
+
 ## Resuming with a plain value (API trigger)
 
 All the models above are typed interrupts that tie the agent's wait state to a specific UiPath operation. When you call `interrupt(...)` with a value that is **not** one of those models, most commonly a plain string but any JSON-serializable value works, the SDK creates an **API resume trigger**. The agent suspends and waits to be resumed by an explicit external API call rather than by polling a UiPath operation.

tests/hitl/mocks/time_trigger_hitl.py

@@ -0,0 +1,33 @@
+from datetime import datetime, timedelta, timezone
+from typing import TypedDict
+
+from langgraph.checkpoint.memory import MemorySaver
+from langgraph.graph import END, START, StateGraph
+from langgraph.types import interrupt
+from uipath.platform.common import WaitTimeTrigger
+
+
+class State(TypedDict):
+    message: str
+
+
+def main_node(state: State) -> State:
+    response = interrupt(
+        WaitTimeTrigger(
+            resume_time=datetime.now(timezone.utc) + timedelta(minutes=1),
+        )
+    )
+    return {"message": str(response)}
+
+
+builder: StateGraph[State] = StateGraph(State)
+
+builder.add_node("main_node", main_node)
+
+builder.add_edge(START, "main_node")
+builder.add_edge("main_node", END)
+
+
+memory = MemorySaver()
+
+graph = builder.compile(checkpointer=memory)

tests/runtime/test_resumable.py

@@ -1,11 +1,13 @@
 import os
 import tempfile
+from datetime import datetime, timezone
 from typing import Any, TypedDict
 
 import pytest
 from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
 from langgraph.graph import END, START, StateGraph
 from langgraph.types import interrupt
+from pydantic import BaseModel, ConfigDict, Field
 from uipath.core.errors import ErrorCategory, UiPathPendingTriggerError
 from uipath.core.triggers import (
     UiPathResumeTrigger,
@@ -86,6 +88,99 @@ async def read_trigger(self, trigger: UiPathResumeTrigger) -> Any:
         return f"Response for {branch_name}"
 
 
+class TimerLikeInterrupt(BaseModel):
+    """Timer-shaped model used to verify typed interrupt pass-through."""
+
+    resume_time: datetime | str = Field(alias="resumeTime")
+
+    model_config = ConfigDict(validate_by_name=True)
+
+
+class CapturingTimerTriggerHandler:
+    """Mock implementation that captures typed time trigger interrupt values."""
+
+    def __init__(self):
+        self.suspend_values: list[TimerLikeInterrupt] = []
+
+    async def create_trigger(self, suspend_value: Any) -> UiPathResumeTrigger:
+        """Create a timer trigger from the typed suspend value."""
+        assert isinstance(suspend_value, TimerLikeInterrupt)
+        self.suspend_values.append(suspend_value)
+        return UiPathResumeTrigger(
+            trigger_type=UiPathResumeTriggerType.TIMER,
+            trigger_name=UiPathResumeTriggerName.TIMER,
+            payload=suspend_value.model_dump(by_alias=True),
+        )
+
+    async def read_trigger(self, trigger: UiPathResumeTrigger) -> Any:
+        """Timer triggers are resumed externally and remain pending locally."""
+        raise UiPathPendingTriggerError(
+            ErrorCategory.SYSTEM, "Time trigger is still pending"
+        )
+
+
+@pytest.mark.asyncio
+async def test_typed_time_interrupt_is_forwarded_to_trigger_handler():
+    """LangGraph interrupt values are passed through for timer-shaped models."""
+
+    class State(TypedDict, total=False):
+        message: str | None
+
+    def wait_for_time(state: State) -> State:
+        result = interrupt(
+            TimerLikeInterrupt(
+                resume_time=datetime(2026, 6, 27, 20, 14, 49, tzinfo=timezone.utc),
+            )
+        )
+        return {"message": f"resumed with: {result}"}
+
+    graph = StateGraph(State)
+    graph.add_node("wait_for_time", wait_for_time)
+    graph.add_edge(START, "wait_for_time")
+    graph.add_edge("wait_for_time", END)
+
+    temp_db = tempfile.NamedTemporaryFile(delete=False, suffix=".db")
+    temp_db.close()
+
+    try:
+        async with AsyncSqliteSaver.from_conn_string(temp_db.name) as memory:
+            compiled_graph = graph.compile(checkpointer=memory)
+            base_runtime = UiPathLangGraphRuntime(
+                graph=compiled_graph,
+                runtime_id="time-trigger-pass-through-test",
+                entrypoint="test",
+            )
+            storage = SqliteResumableStorage(memory)
+            trigger_handler = CapturingTimerTriggerHandler()
+            runtime = UiPathResumableRuntime(
+                delegate=base_runtime,
+                storage=storage,
+                trigger_manager=trigger_handler,
+                runtime_id="time-trigger-pass-through-test",
+            )
+
+            result = await runtime.execute(
+                input={"message": None},
+                options=UiPathExecuteOptions(resume=False),
+            )
+
+            assert result.status == UiPathRuntimeStatus.SUSPENDED
+            assert len(trigger_handler.suspend_values) == 1
+            suspend_value = trigger_handler.suspend_values[0]
+            assert suspend_value.resume_time == datetime(
+                2026, 6, 27, 20, 14, 49, tzinfo=timezone.utc
+            )
+            assert result.triggers is not None
+            assert result.triggers[0].trigger_type == UiPathResumeTriggerType.TIMER
+            assert result.triggers[0].payload == {
+                "resumeTime": datetime(
+                    2026, 6, 27, 20, 14, 49, tzinfo=timezone.utc
+                ),
+            }
+    finally:
+        os.unlink(temp_db.name)
+
+
 @pytest.mark.asyncio
 async def test_parallel_branches_with_sequential_trigger_resolution():
     """Test graph execution with parallel branches where triggers resolve sequentially."""