Source note · Stateful tools in the Model Context Protocol
The specification reconciles stateful tools with the rule that a tool set must not vary per connection: the invariance rule binds the tools list operation while handles vary the tool call.
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, Server Features: Tools — Model Context Protocol project · tier 1 standards and regulators · Tools > overview paragraph read together with Stateful Tools
Cite this note
APA
WarmTransfer. (2026, September 5). Stateful tools in the Model Context Protocol: source note statetool-per-connection-rule-reconciled. WarmTransfer. https://warmtransfer.net/knowledge/claims/statetool-per-connection-rule-reconciled
BibTeX
@misc{warmtransfer-claim-statetool-per-connection-rule-reconciled,
title = {Stateful tools in the Model Context Protocol: source note statetool-per-connection-rule-reconciled},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/statetool-per-connection-rule-reconciled},
note = {Source note statetool-per-connection-rule-reconciled, checked 2026-09-05}
}