feat: resolve ArgumentEmail and ArgumentGroupName recipients at runtime

Updates resolve_recipient_value() in escalation_tool to handle the two
new argument-driven recipient types. Each type carries an argument_name
that is looked up in the tool's runtime kwargs to produce a concrete
email or group-name TaskRecipient.

Follows the same pattern as AssetRecipient resolution. Backward
compatible -- input_args defaults to None.

Depends on uipath-python adding ArgumentEmailRecipient and
ArgumentGroupNameRecipient to uipath.agent.models.agent.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: dushyant-uipath

src/uipath_langchain/agent/tools/escalation_tool.py

@@ -11,6 +11,8 @@
     AgentEscalationRecipient,
     AgentEscalationRecipientType,
     AgentEscalationResourceConfig,
+    ArgumentEmailRecipient,
+    ArgumentGroupNameRecipient,
     AssetRecipient,
     StandardRecipient,
 )
@@ -49,6 +51,7 @@ class EscalationAction(str, Enum):
 
 async def resolve_recipient_value(
     recipient: AgentEscalationRecipient,
+    input_args: dict[str, Any] | None = None,
 ) -> TaskRecipient | None:
     """Resolve recipient value based on recipient type."""
     if isinstance(recipient, AssetRecipient):
@@ -60,6 +63,18 @@ async def resolve_recipient_value(
             type = TaskRecipientType.GROUP_NAME
         return TaskRecipient(value=value, type=type, displayName=value)
 
+    if isinstance(recipient, ArgumentEmailRecipient):
+        value = (input_args or {}).get(recipient.argument_name)
+        return TaskRecipient(
+            value=value, type=TaskRecipientType.EMAIL, displayName=value
+        )
+
+    if isinstance(recipient, ArgumentGroupNameRecipient):
+        value = (input_args or {}).get(recipient.argument_name)
+        return TaskRecipient(
+            value=value, type=TaskRecipientType.GROUP_NAME, displayName=value
+        )
+
     if isinstance(recipient, StandardRecipient):
         type = TaskRecipientType(recipient.type)
         if recipient.type == AgentEscalationRecipientType.USER_EMAIL:
@@ -160,7 +175,7 @@ class EscalationToolOutput(BaseModel):
 
     async def escalation_tool_fn(**kwargs: Any) -> dict[str, Any]:
         recipient: TaskRecipient | None = (
-            await resolve_recipient_value(channel.recipients[0])
+            await resolve_recipient_value(channel.recipients[0], input_args=kwargs)
             if channel.recipients
             else None
         )