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modelcontextprotocol--pytho…/docs_src/elicitation/tutorial004.py
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chore: import upstream snapshot with attribution
2026-07-13 12:10:27 +08:00

48 lines
1.4 KiB
Python

from typing import Annotated
from pydantic import BaseModel
from mcp.server import MCPServer
from mcp.server.mcpserver import (
AcceptedElicitation,
CancelledElicitation,
DeclinedElicitation,
Elicit,
ElicitationResult,
Resolve,
)
mcp = MCPServer("Files")
_FOLDERS: dict[str, list[str]] = {"/tmp/empty": [], "/tmp/project": ["main.py", "README.md"]}
class Confirm(BaseModel):
ok: bool
async def confirm_delete(path: str) -> Confirm | Elicit[Confirm]:
"""Resolver: ask for confirmation only when the folder is not empty."""
file_count = len(_FOLDERS.get(path, []))
if file_count == 0:
return Confirm(ok=True) # nothing to confirm, no round-trip to the client
return Elicit(f"{path} has {file_count} file(s). Delete anyway?", Confirm)
@mcp.tool()
async def delete_folder(
path: str,
confirm: Annotated[ElicitationResult[Confirm], Resolve(confirm_delete)],
) -> str:
"""Delete a folder, asking for confirmation when it is not empty."""
match confirm:
case AcceptedElicitation(data=Confirm(ok=True)):
_FOLDERS.pop(path, None)
return f"deleted {path}"
case AcceptedElicitation():
return "kept the folder"
case DeclinedElicitation():
return "declined: folder not deleted"
case CancelledElicitation():
return "cancelled: folder not deleted"