Source note · Tool schema signature monitoring and drift handling
The 2026-07-28 revision requires that the set of tools a server returns MUST NOT vary per connection or as a side effect of other requests on the connection although it MAY change over time.
Checked 2026-09-05
MUST NOT vary per-connection or as a side effect of other requests on the connection
- 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 on tools/list responses
Cite this note
APA
WarmTransfer. (2026, September 5). Tool schema signature monitoring and drift handling: source note sigdrift-spec-must-not-vary. WarmTransfer. https://warmtransfer.net/knowledge/claims/sigdrift-spec-must-not-vary
BibTeX
@misc{warmtransfer-claim-sigdrift-spec-must-not-vary,
title = {Tool schema signature monitoring and drift handling: source note sigdrift-spec-must-not-vary},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sigdrift-spec-must-not-vary},
note = {Source note sigdrift-spec-must-not-vary, checked 2026-09-05}
}