chore: Use zod/v3 in Agent tutorial and add plain LangChain MCP sample code
#1162
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ZhongpinWang
changed the title
zod/v3 in Agent tutorial and add plain LangChain MCP sample codezod/v3 in Agent tutorial and add plain LangChain MCP sample code
ZhongpinWang
commented
Oct 7, 2025
| import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'; | ||
| import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js'; | ||
| import * as z from 'zod/v4'; | ||
| import * as z from 'zod/v3'; |
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https://github.com/modelcontextprotocol/typescript-sdk/blob/e0de0829019a4eab7af29c05f9a7ec13364f121e/package.json#L75 This zod version is outdated and does not support zod/v4 feature and is not compatible with our latest [email protected] package.
deekshas8
reviewed
Oct 8, 2025
| new HumanMessage('What is the weather like in Berlin?') | ||
| ]; | ||
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| const response = await client.bindTools(tools).invoke(messages); |
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[pp] We could just use getMcpTools here since it returns an array anyway, no point creating a copy of the same array
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True, initially I was doing this, but I need to access tools[0] later again to invoke the actual function, thus, I extracted this out, otherwise we call getMcpTools() twice.
deekshas8
approved these changes
Oct 8, 2025
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Context
Relates to #1145.
Relates to SAP/ai-sdk-js-backlog#374
What this PR does and why it is needed
The first part is about switching from using
zod/v4tozod/v3with[email protected]package insample-code/src/tutorials/mcp/weather-mcp-server.tssince@modelcontextprotocol/sdkdoes not even supportzod/v4from[email protected]due to the outdated zod dependency.modelcontextprotocoltypescript sdk is working on supporting[email protected]package directly. See modelcontextprotocol/typescript-sdk#869.The second part is to add a new sample-code show-casing how to use LangChain's MCP adapter with pure LangChain
bindTools()without LangGraph. (as requested in #1145).