wehub-resource-sync
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71 lines
2.9 KiB
Python
71 lines
2.9 KiB
Python
"""Elicitation (handshake-era push style) against the low-level Server."""
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from typing import Any
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import mcp_types as types
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from mcp.server.context import ServerRequestContext
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from mcp.server.lowlevel import Server
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from stories._hosting import run_server_from_args
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REGISTRATION_SCHEMA: types.ElicitRequestedSchema = {
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"type": "object",
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"properties": {
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"username": {"type": "string"},
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"plan": {"type": "string", "enum": ["free", "pro", "team"]},
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},
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"required": ["username"],
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}
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LINK_INPUT_SCHEMA: dict[str, Any] = {
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"type": "object",
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"properties": {"provider": {"type": "string"}},
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"required": ["provider"],
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}
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def build_server() -> Server[Any]:
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async def list_tools(
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ctx: ServerRequestContext[Any], params: types.PaginatedRequestParams | None
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) -> types.ListToolsResult:
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return types.ListToolsResult(
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tools=[
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types.Tool(
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name="register_user", description="Register a new account.", input_schema={"type": "object"}
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),
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types.Tool(
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name="link_account", description="Link a third-party account.", input_schema=LINK_INPUT_SCHEMA
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),
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]
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)
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async def call_tool(ctx: ServerRequestContext[Any], params: types.CallToolRequestParams) -> types.CallToolResult:
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if params.name == "register_user":
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answer = await ctx.session.elicit_form(
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"Please provide your registration details:", REGISTRATION_SCHEMA, related_request_id=ctx.request_id
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)
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if answer.action != "accept" or answer.content is None:
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return types.CallToolResult(content=[types.TextContent(text=f"registration {answer.action}")])
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text = f"registered {answer.content['username']} (plan: {answer.content.get('plan') or 'free'})"
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return types.CallToolResult(content=[types.TextContent(text=text)])
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assert params.name == "link_account" and params.arguments is not None
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provider = params.arguments["provider"]
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# elicitation_id must be unique per elicitation, not per provider — scope it to this request.
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elicitation_id = f"link-{provider}-{ctx.request_id}"
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answer = await ctx.session.elicit_url(
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f"Sign in to {provider} to link your account",
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url=f"https://example.com/oauth/{provider}/authorize",
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elicitation_id=elicitation_id,
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related_request_id=ctx.request_id,
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)
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if answer.action != "accept":
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return types.CallToolResult(content=[types.TextContent(text=f"link {answer.action}")])
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await ctx.session.send_elicit_complete(elicitation_id, related_request_id=ctx.request_id)
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return types.CallToolResult(content=[types.TextContent(text=f"linked {provider}")])
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return Server("legacy-elicitation-example", on_list_tools=list_tools, on_call_tool=call_tool)
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if __name__ == "__main__":
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run_server_from_args(build_server)
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