Model Context Protocol specification 2026-07-28, Subscriptions

Publisher

Model Context Protocol project

URL

https://modelcontextprotocol.io/specification/2026-07-28/basic/patterns/subscriptions

Published

2026-07-28

Updated

unknown

Accessed

2026-09-05

HTTP status

200

License

MIT license; permitted under the specification license

Claims citing this source

• A client whose requested toolsListChanged filter is silently dropped from the subscription acknowledgment receives no notification, so the caching page's invalidation scenario never applies to it even though the server advertised listChanged. inference in context
• The subscriptions listen stream replaces the former resources subscribe request, so resource subscriptions and tool list notifications now share one filter-based mechanism rather than running in parallel. fact in context
• The subscriptions page states that a server MUST NOT send notification types the client has not explicitly requested. fact in context
• 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. fact in context
• The Model Context Protocol defines a subscriptions listen stream that a client opens to receive server notifications. fact in context
• The subscriptions page states a client obligation for the standard input and output transport: a client MUST demultiplex incoming notifications by subscription identifier. fact in context
• The specification does not state what becomes of a notifiable event that occurs while no client holds a matching subscription; neither the subscriptions page the streamable transport page the tools page nor the changelog addresses retention queueing or replay. fact in context

Cite this source record

APA

WarmTransfer. (2026, July 28). Model Context Protocol specification 2026-07-28, Subscriptions. WarmTransfer. https://warmtransfer.net/knowledge/sources/mcp-spec-2026-07-28-subscriptions

BibTeX

@misc{warmtransfer-mcp-spec-2026-07-28-subscriptions,
  title  = {Model Context Protocol specification 2026-07-28, Subscriptions},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/mcp-spec-2026-07-28-subscriptions},
  note   = {Model Context Protocol project, accessed 2026-09-05}
}