Source note · Model Context Protocol transports compared
MCP revision 2026-07-28 removed protocol-level sessions and the Mcp-Session-Id header from the Streamable HTTP transport, and removed the initialize / notifications/initialized handshake so that every request carries its protocol version and client capabilities in _meta.
Checked 2026-09-30
- Vendor
- Model Context Protocol project
- Product
- MCP specification
- Subsystem
- Streamable HTTP transport
- Deployment
- local-subprocess, remote-http
- Region
- not restricted
- Release range
- MCP revision 2026-07-28
- Checked
- 2026-09-30
Sources
- Model Context Protocol specification 2026-07-28, Key Changes — Model Context Protocol project · tier 1 standards and regulators · section Major changes, items 1 and 2
Cite this note
APA
WarmTransfer. (2026, September 30). Model Context Protocol transports compared: source note mcp-transport-differences-sessions-removed. WarmTransfer. https://warmtransfer.net/knowledge/claims/mcp-transport-differences-sessions-removed
BibTeX
@misc{warmtransfer-claim-mcp-transport-differences-sessions-removed,
title = {Model Context Protocol transports compared: source note mcp-transport-differences-sessions-removed},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/mcp-transport-differences-sessions-removed},
note = {Source note mcp-transport-differences-sessions-removed, checked 2026-09-30}
}