Implement SEP-1036: URL mode elicitation for secure out-of-band interactions (#1580)

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

tests/server/fastmcp/test_elicitation.py

@@ -7,6 +7,7 @@ from typing import Any
 import pytest
 from pydantic import BaseModel, Field
 
+from mcp import types
 from mcp.client.session import ClientSession, ElicitationFnT
 from mcp.server.fastmcp import Context, FastMCP
 from mcp.server.session import ServerSession
@@ -288,6 +289,7 @@ async def test_elicitation_with_default_values():
     # First verify that defaults are present in the JSON schema sent to clients
     async def callback_schema_verify(context: RequestContext[ClientSession, None], params: ElicitRequestParams):
         # Verify the schema includes defaults
+        assert isinstance(params, types.ElicitRequestFormParams), "Expected form mode elicitation"
         schema = params.requestedSchema
         props = schema["properties"]