Justin Spahr-Summers
jspahrsummers.bsky.social
Justin Spahr-Summers
@jspahrsummers.bsky.social
Member of Technical Staff at Anthropic PBC. Opinions are mine alone, and don't reflect those of my employer.

Note that I check Bluesky infrequently, and responses may be significantly delayed or sometimes not possible at all.

https://jspahrsummers.com
We've officially tagged revision 2025-03-26 of the MCP spec!

This brings some long-awaited changes, like:
- Authorization
- New Streamable HTTP transport
- Tool annotations for describing read-only, destructive, etc. beahviors

See spec.modelcontextprotocol.io/specificatio... for more!
Key Changes
This document lists changes made to the Model Context Protocol (MCP) specification since the previous revision, 2024-11-05. Major changes Added a comprehensive authorization framework based on OA...
spec.modelcontextprotocol.io
March 26, 2025 at 2:49 PM
After ironing out bugs and documentation, I'm happy to now announce the simplified API for the MCP TypeScript SDK! See the Quick Start here: github.com/modelcontext...

This follows the adoption of FastMCP in the Python SDK, but adapted for the conventions of the JS ecosystem. Feedback welcome!
GitHub - modelcontextprotocol/typescript-sdk: The official Typescript SDK for Model Context Protocol servers and clients
The official Typescript SDK for Model Context Protocol servers and clients - modelcontextprotocol/typescript-sdk
github.com
January 23, 2025 at 4:11 PM