Source note · Tool schema signature monitoring and drift handling
The 2026-07-28 revision states that servers SHOULD return tools in a deterministic order meaning the same ordering across requests when the underlying set has not changed and gives reliable client caching and model prompt cache hit rates as the reasons.
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 on tools/list responses
Cite this note
APA
WarmTransfer. (2026, September 5). Tool schema signature monitoring and drift handling: source note sigdrift-spec-deterministic-order. WarmTransfer. https://warmtransfer.net/knowledge/claims/sigdrift-spec-deterministic-order
BibTeX
@misc{warmtransfer-claim-sigdrift-spec-deterministic-order,
title = {Tool schema signature monitoring and drift handling: source note sigdrift-spec-deterministic-order},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sigdrift-spec-deterministic-order},
note = {Source note sigdrift-spec-deterministic-order, checked 2026-09-05}
}