# Model Context Protocol TypeScript SDK (@modelcontextprotocol/sdk) - AgentBreakWatch Reference

> TL;DR Verdict: Model Context Protocol TypeScript SDK (`@modelcontextprotocol/sdk`) is currently at v1.32.2 on NPM (published 2026-10-23), with a 90-day Stability Score of 78/100 (B) and HIGH schema drift risk across 6 releases in the last 90 days. Streamable HTTP transport replaces legacy SSEClientTransport defaults; McpServer.registerTool inputSchema requires Zod object shape or JSON Schema draft-2020-12.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/mcp-sdk-ts
- Category Hub: https://agentbreakwatch.vercel.app/c/agent-sdks (AI Agent SDKs & Frameworks Breaking-Change Index)
- Package Name: `@modelcontextprotocol/sdk`
- Registry: NPM (https://www.npmjs.com/package/@modelcontextprotocol/sdk)
- GitHub Repository: https://github.com/modelcontextprotocol/typescript-sdk
- Vendor: Model Context Protocol
- Latest Live Version: v1.32.2
- Published Date: 2026-10-23T18:11:38.362Z
- 90-Day Release Count: 6
- Direct Dependencies: 17
- License: MIT
- Stability Score: 78/100 (Grade B)
- Schema Drift Risk: HIGH
- Recommended Exact Pin Command: `npm install @modelcontextprotocol/sdk@1.32.2`
- Watched Symbols / MCP Tools: McpServer, StreamableHTTPServerTransport, SSEClientTransport, registerTool
- Snapshot Timestamp: 2026-10-24T12:11:27.697Z

## Breaking Change & Schema Drift Summary
Streamable HTTP transport replaces legacy SSEClientTransport defaults; McpServer.registerTool inputSchema requires Zod object shape or JSON Schema draft-2020-12.

## Migration Diff: Before (Deprecated / Unpinned Pattern)
```
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
const transport = new SSEServerTransport("/messages", res);
await server.connect(transport);
```

## Migration Diff: After (Verified v1.32.2 Pattern)
```
import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
const transport = new StreamableHTTPServerTransport({ sessionIdGenerator: () => crypto.randomUUID() });
await server.connect(transport);
```

## Recent Verified Releases
- v1.32.2 (published 2026-10-23) [LATEST]
- v1.32.1 (published 2026-10-05)
- v1.32.0 (published 2026-10-02)
- v1.31.0 (published 2026-09-28)
- v1.30.1 (published 2026-09-23)
- v1.30.0 (published 2026-07-27)