7 Breaking Changes in the 2026-07-28 MCP Spec: Your Before/After Migration Guide
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The 2026-07-28 MCP spec removes sessions and the initialize handshake. Run these 7 greps against your src/ to find every breaking change, then migrate in order: sessions first, then handshake, then error codes. The 2026-07-28 MCP spec is the biggest revision since the protocol launched, and it is not backward compatible . If you run a production MCP server, code stops working that day. Most write-ups explain the why (MCP went stateless). But you need the what : which lines break, and what to…
1Key Takeaways
- The 2026-07-28 MCP spec removes sessions and the initialize handshake.
- Run these 7 greps against your src/ to find every breaking change, then migrate in order: sessions first, then handshake, then error codes.
- The 2026-07-28 MCP spec is the biggest revision since the protocol launched, and it is not backward compatible .
- If you run a production MCP server, code stops working that day.
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — ML reports that the 2026-07-28 MCP spec removes sessions and the initialize handshake.
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