Source note · Model Context Protocol transports compared
On stdio in MCP revision 2026-07-28 the server MUST NOT write JSON-RPC requests to stdout and the client MUST NOT write JSON-RPC responses to stdin; server-to-client interactions are carried in InputRequiredResult replies.
Checked 2026-09-30
- Vendor
- Model Context Protocol project
- Product
- MCP specification
- Subsystem
- stdio transport
- Deployment
- local-subprocess
- Region
- not restricted
- Release range
- MCP revision 2026-07-28
- Checked
- 2026-09-30
Sources
- stdio — Model Context Protocol (modelcontextprotocol.io) · tier 1 standards and regulators · sections Sending Messages and Receiving Messages (final paragraph)
Cite this note
APA
WarmTransfer. (2026, September 30). Model Context Protocol transports compared: source note mcp-transport-differences-stdio-no-server-requests. WarmTransfer. https://warmtransfer.net/knowledge/claims/mcp-transport-differences-stdio-no-server-requests
BibTeX
@misc{warmtransfer-claim-mcp-transport-differences-stdio-no-server-requests,
title = {Model Context Protocol transports compared: source note mcp-transport-differences-stdio-no-server-requests},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/mcp-transport-differences-stdio-no-server-requests},
note = {Source note mcp-transport-differences-stdio-no-server-requests, checked 2026-09-30}
}