fix: try to send cancelled notification on failure

Author: cristipufu

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "uipath-mcp"
-version = "0.0.42"
+version = "0.0.43"
 description = "UiPath MCP SDK"
 readme = { file = "README.md", content-type = "text/markdown" }
 requires-python = ">=3.10"

src/uipath_mcp/_cli/_runtime/_runtime.py

@@ -5,6 +5,7 @@
 import tempfile
 from typing import Any, Dict, Optional
 
+import mcp.types as types
 from mcp import ClientSession, StdioServerParameters
 from mcp.client.stdio import stdio_client
 from opentelemetry import trace
@@ -272,7 +273,6 @@ async def _register(self) -> None:
         except BaseException as e:
             logger.error(f"Error during server initialization: {e}")
 
-
         # Now that we're outside the context managers, check if initialization succeeded
         if not initialization_successful:
             await self.dispose_session()
@@ -329,7 +329,25 @@ async def dispose_session(self) -> None:
         try:
             response = self._uipath.api_client.request(
                 "POST",
-                f"mcp_/mcp/{self.server.name}/dispose?sessionId={self.server.session_id}"
+                f"mcp_/mcp/{self.server.name}/out/message?sessionId={self.server.session_id}",
+                json=types.JSONRPCNotification(
+                    jsonrpc="2.0",
+                    method="notifications/cancelled",
+                    params={"requestId": "*"},
+                ).model_dump(),
+            )
+            if response.status_code == 202:
+                logger.info(
+                    f"Sent outgoing cancelled message to UiPath MCP Server: {self.server.session_id}"
+                )
+            else:
+                logger.error(
+                    f"Error sending outgoing cancelled message to to UiPath MCP Server: {response.status_code} - {response.text}"
+                )
+
+            response = self._uipath.api_client.request(
+                "POST",
+                f"mcp_/mcp/{self.server.name}/dispose?sessionId={self.server.session_id}",
             )
             if response.status_code == 202:
                 logger.info(