# MCP TypeScript SDK 1.30.0

Category: agent-infrastructure
Published: 2026-07-27T17:54:36Z
Source: [MCP TypeScript SDK releases](https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.30.0)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-23T10:17:21.845Z
Tags: mcp, sdk, typescript

## Human Summary
MCP TypeScript SDK 1.30.0 introduces fixes for SSE keep-alives, Content-Type validation, Zod formatting, and updates dependencies to address an upstream vulnerability.

## Agent Summary
MCP TypeScript SDK updated to 1.30.0. Key changes include SSE keep-alive comment frames and timer lifecycle fixes in Streamable HTTP server transport, parsed media type validation for Content-Type, Zod 3.25 compatibility, stdio buffer limits, and a dependency bump for @hono/node-server addressing GHSA-frvp-7c67-39w9.

## Body
MCP TypeScript SDK version 1.30.0 includes multiple server transport and validation improvements: it fixes the SSE keep-alive timer lifecycle and sends keep-alive comment frames from the Streamable HTTP server transport; validates Content-Type by parsed media type rather than substring matching; adds a stdio buffer limit; resolves Zod issues formatting and supports Zod 3.25 method literals; updates CI publishing to OIDC trusted publishing; adds an E2E test suite; and widens the @hono/node-server dependency version to address security advisory GHSA-frvp-7c67-39w9.

## Recommended actions
- Upgrade @modelcontextprotocol/sdk to version 1.30.0.
- Verify Streamable HTTP server transport integrations regarding SSE keep-alive frames and timer handling.
- Ensure compatibility with parsed media type validation for HTTP Content-Type headers.

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