feat(langgraph): Add interrupt schema to library (#2947)

libs/langgraph/langgraph/prebuilt/interrupt.py

@@ -0,0 +1,94 @@
+from typing import (
+    Literal,
+    Optional,
+    Union,
+)
+
+from typing_extensions import TypedDict
+
+
+class HumanInterruptConfig(TypedDict):
+    """Configuration that defines what actions are allowed for a human interrupt.
+
+    This controls the available interaction options when the graph is paused for human input.
+
+    Attributes:
+        allow_ignore: Whether the human can choose to ignore/skip the current step
+        allow_respond: Whether the human can provide a text response/feedback
+        allow_edit: Whether the human can edit the provided content/state
+        allow_accept: Whether the human can accept/approve the current state
+    """
+
+    allow_ignore: bool
+    allow_respond: bool
+    allow_edit: bool
+    allow_accept: bool
+
+
+class ActionRequest(TypedDict):
+    """Represents a request for human action within the graph execution.
+
+    Contains the action type and any associated arguments needed for the action.
+
+    Attributes:
+        action: The type or name of action being requested (e.g., "Approve XYZ action")
+        args: Key-value pairs of arguments needed for the action
+    """
+
+    action: str
+    args: dict
+
+
+class HumanInterrupt(TypedDict):
+    """Represents an interrupt triggered by the graph that requires human intervention.
+
+    This is passed to the `interrupt` function when execution is paused for human input.
+
+    Attributes:
+        action_request: The specific action being requested from the human
+        config: Configuration defining what actions are allowed
+        description: Optional detailed description of what input is needed
+
+    Example:
+        ```python
+        # Extract a tool call from the state and create an interrupt request
+        request = HumanInterrupt(
+            action_request=ActionRequest(
+                action="run_command",  # The action being requested
+                args={"command": "ls", "args": ["-l"]}  # Arguments for the action
+            ),
+            config=HumanInterruptConfig(
+                allow_ignore=True,    # Allow skipping this step
+                allow_respond=True,   # Allow text feedback
+                allow_edit=False,     # Don't allow editing
+                allow_accept=True     # Allow direct acceptance
+            ),
+            description="Please review the command before execution"
+        )
+        # Send the interrupt request and get the response
+        response = interrupt([request])[0]
+        ```
+    """
+
+    action_request: ActionRequest
+    config: HumanInterruptConfig
+    description: Optional[str]
+
+
+class HumanResponse(TypedDict):
+    """The response provided by a human to an interrupt, which is returned when graph execution resumes.
+
+    Attributes:
+        type: The type of response:
+            - "accept": Approves the current state without changes
+            - "ignore": Skips/ignores the current step
+            - "response": Provides text feedback or instructions
+            - "edit": Modifies the current state/content
+        arg: The response payload:
+            - None: For ignore/accept actions
+            - str: For text responses
+            - ActionRequest: For edit actions with updated content
+    """
+
+    type: Literal["accept", "ignore", "response", "edit"]
+    args: Union[None, str, ActionRequest]