MCP adapter: nested JSON/Zod schema fields not surfaced to agents (arrays/objects ignored)

[kkutrowski]

AutoGen agents don’t see nested fields from an MCP tool’s inputSchema. Only top-level scalars are surfaced, so arrays/objects appear “missing.”

Example tool:

`import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { z } from "zod";

export function registerTodoCreate(server: McpServer) {
const itemShape = {
text: z.string(),
done: z.boolean().optional(),
} satisfies z.ZodRawShape;

const toolInput = {
listName: z.string(),
items: z.array(z.object(itemShape)).min(1),
} satisfies z.ZodRawShape;

server.registerTool(
"todo_create",
{
title: "Create a TODO list",
description: "Creates a TODO list with items.",
inputSchema: toolInput,
},
async (args) => ({ content: [{ type: "text", text: JSON.stringify(args) }] })
);
}`

Expected agent input:
{ "listName": "Weekend chores", "items": [ { "text": "Buy milk" }, { "text": "Mow lawn", "done": false } ] }

Actual: agent only lists listName and says items doesn’t exist.

Env: AutoGen 0.7.4 (Python), MCP server @modelcontextprotocol/sdk (Node).
I tried wrapping under payload: z.object(...) but I had the same result.

Questions

Is this a known limitation/bug in the AutoGen MCP adapter?
Is there a recommended pattern to support nested inputs without stringifying?