chore: import upstream snapshot with attribution

contributing/samples/mcp/mcp_sse_agent/README.md

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+This agent connects to a local MCP server via sse.
+
+To run this agent, start the local MCP server first by :
+
+```bash
+uv run filesystem_server.py
+```

contributing/samples/mcp/mcp_sse_agent/__init__.py

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+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from . import agent

contributing/samples/mcp/mcp_sse_agent/agent.py

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+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+import os
+import pprint
+from typing import Any
+
+from google.adk.agents.llm_agent import LlmAgent
+from google.adk.agents.mcp_instruction_provider import McpInstructionProvider
+from google.adk.tools.base_tool import BaseTool
+from google.adk.tools.mcp_tool.mcp_session_manager import SseConnectionParams
+from google.adk.tools.mcp_tool.mcp_toolset import MCPToolset
+from google.adk.tools.tool_context import ToolContext
+
+# Configure logging; the mcp_tool logger must be set to
+# DEBUG to capture http_debug_info
+logging.basicConfig(level=logging.INFO)
+logging.getLogger('google_adk.google.adk.tools.mcp_tool.mcp_tool').setLevel(
+    logging.DEBUG
+)
+
+_allowed_path = os.path.dirname(os.path.abspath(__file__))
+
+connection_params = SseConnectionParams(
+    url='http://localhost:3000/sse',
+    headers={'Accept': 'text/event-stream'},
+)
+
+
+def after_tool_debug_callback(
+    tool: BaseTool,
+    args: dict[str, Any],
+    tool_context: ToolContext,
+    tool_response: dict[str, Any],
+) -> dict[str, Any] | None:
+  # pylint: disable=unused-argument
+  print(f'\n=== HTTP Debug Info (from Callback for {tool.name}) ===')
+  pprint.pprint(tool_context.custom_metadata.get('http_debug_info'))
+  print('====================================================\n')
+  return None
+
+
+root_agent = LlmAgent(
+    name='enterprise_assistant',
+    instruction=McpInstructionProvider(
+        connection_params=connection_params,
+        prompt_name='file_system_prompt',
+    ),
+    tools=[
+        MCPToolset(
+            connection_params=connection_params,
+            # don't want agent to do write operation
+            # you can also do below
+            # tool_filter=lambda tool, ctx=None: tool.name
+            # not in [
+            #     'write_file',
+            #     'edit_file',
+            #     'create_directory',
+            #     'move_file',
+            # ],
+            tool_filter=[
+                'read_file',
+                'read_multiple_files',
+                'list_directory',
+                'directory_tree',
+                'search_files',
+                'get_file_info',
+                'list_allowed_directories',
+            ],
+            require_confirmation=True,
+        )
+    ],
+    after_tool_callback=after_tool_debug_callback,
+)

contributing/samples/mcp/mcp_sse_agent/filesystem_server.py

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+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import asyncio
+import os
+from pathlib import Path
+import sys
+
+from mcp.server.fastmcp import FastMCP
+
+# Create an MCP server with a name
+mcp = FastMCP("Filesystem Server", host="localhost", port=3000)
+
+
+# Add a tool to read file contents
+@mcp.tool(description="Read contents of a file")
+def read_file(filepath: str) -> str:
+  """Read and return the contents of a file."""
+  with open(filepath, "r") as f:
+    return f.read()
+
+
+# Add a tool to list directory contents
+@mcp.tool(description="List contents of a directory")
+def list_directory(dirpath: str) -> list:
+  """List all files and directories in the given directory."""
+  return os.listdir(dirpath)
+
+
+# Add a tool to get current working directory
+@mcp.tool(description="Get current working directory")
+def get_cwd() -> str:
+  """Return the current working directory."""
+  return str(Path.cwd())
+
+
+# Add a prompt for accessing file systems
+@mcp.prompt(name="file_system_prompt")
+def file_system_prompt() -> str:
+  return f"""\
+Help the user access their file systems."""
+
+
+# Graceful shutdown handler
+async def shutdown(signal, loop):
+  """Cleanup tasks tied to the service's shutdown."""
+  print(f"\nReceived exit signal {signal.name}...")
+
+  # Get all running tasks
+  tasks = [t for t in asyncio.all_tasks() if t is not asyncio.current_task()]
+
+  # Cancel all tasks
+  for task in tasks:
+    task.cancel()
+
+  print(f"Cancelling {len(tasks)} outstanding tasks")
+  await asyncio.gather(*tasks, return_exceptions=True)
+
+  # Stop the loop
+  loop.stop()
+  print("Shutdown complete!")
+
+
+# Main entry point with graceful shutdown handling
+if __name__ == "__main__":
+  try:
+    # The MCP run function ultimately uses asyncio.run() internally
+    mcp.run(transport="sse")
+  except KeyboardInterrupt:
+    print("\nServer shutting down gracefully...")
+    # The asyncio event loop has already been stopped by the KeyboardInterrupt
+    print("Server has been shut down.")
+  except Exception as e:
+    print(f"Unexpected error: {e}")
+    sys.exit(1)
+  finally:
+    print("Thank you for using the Filesystem MCP Server!")