A subscription filter type the server does not support is omitted from the acknowledgment rather than raising an error and the client side check that would catch the omission is a SHOULD.
Checked 2026-09-05
- Vendor
- Model Context Protocol project
- Product
- Model Context Protocol
- Subsystem
- protocol
- Deployment
- not restricted
- Region
- not restricted
- Release range
- specification revision 2026-07-28
- Checked
- 2026-09-05
Sources
- Model Context Protocol specification 2026-07-28, Subscriptions — Model Context Protocol project · tier 1 standards and regulators · Subscriptions, filter negotiation
Cite this note
APA
WarmTransfer. (2026, September 5). The MCP subscriptions listen stream and notification delivery: source note mcpsub-filter-negotiation-silent-downgrade. WarmTransfer. https://warmtransfer.net/knowledge/claims/mcpsub-filter-negotiation-silent-downgrade
BibTeX
@misc{warmtransfer-claim-mcpsub-filter-negotiation-silent-downgrade,
title = {The MCP subscriptions listen stream and notification delivery: source note mcpsub-filter-negotiation-silent-downgrade},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/mcpsub-filter-negotiation-silent-downgrade},
note = {Source note mcpsub-filter-negotiation-silent-downgrade, checked 2026-09-05}
}