Pass InputRequiredResult through the MCPServer prompt and resource pipelines (#3020)

docs_src/mrtr/tutorial004.py

@@ -0,0 +1,26 @@
+from mcp_types import ElicitRequest, ElicitRequestFormParams, ElicitResult, InputRequiredResult
+
+from mcp.server.mcpserver import Context, MCPServer
+from mcp.server.mcpserver.prompts.base import UserMessage
+
+mcp = MCPServer("Briefing")
+
+ASK_AUDIENCE = ElicitRequest(
+    params=ElicitRequestFormParams(
+        message="Who is the briefing for?",
+        requested_schema={
+            "type": "object",
+            "properties": {"audience": {"type": "string"}},
+            "required": ["audience"],
+        },
+    )
+)
+
+
+@mcp.prompt()
+async def briefing(ctx: Context) -> list[UserMessage] | InputRequiredResult:
+    """Draft a briefing tuned to its audience."""
+    answer = (ctx.input_responses or {}).get("audience")
+    if not isinstance(answer, ElicitResult) or answer.content is None:
+        return InputRequiredResult(input_requests={"audience": ASK_AUDIENCE})
+    return [UserMessage(f"Write a briefing for {answer.content['audience']}.")]