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7/30/2026
MCP Went Stateless: Migrating to the 2026-07-28 Spec (and Proving It Works)

MCP Went Stateless: Migrating to the 2026-07-28 Spec (and Proving It Works)

Short summary

The 2026-07-28 MCP spec eliminates sessions entirely — every request is self-contained with version info in _meta headers. TypeScript ships two new packages alongside the legacy SDK, and a codemod handles mechanical migration. The author identifies a critical security bug: unsigned requestState blobs that round-trip through clients become attacker-controlled input.

  • •MCP 2026-07-28 spec removes sessions; every request is stateless and self-contained
  • •TypeScript v2 packages ship alongside legacy SDK with a codemod for migration
  • •New security risk: unsigned requestState blobs are attacker-controlled input

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