generated: '2026-09-17'
method: searched
source: >-
  https://github.com/InteractiveAdvertisingBureau/openrtb2.x (README versioning policy + releases),
  https://github.com/IABTechLab/iab-agentic-primitives (README versioning policy),
  https://iabtechlab.github.io/seller-agent/api/mcp/ (transport deprecation), seller-agent CHANGELOG.
versioning:
  openrtb:
    scheme: major.minor-YYYYMM date code (e.g. 2.6-202606); version number increments only on breaking changes since 2.6-202211
    current: 2.6-202606 (released 2026-06-11)
    cadence: non-breaking updates roughly monthly; each release paired with a git tag "2.6-YYYYMM"
    policy_url: https://github.com/InteractiveAdvertisingBureau/openrtb2.x#versioning-policy
  adcom:
    scheme: 1.0-YYYYMM
    current: AdCOM1.0-202607 (2026-07-16)
  opendirect:
    current: 2.1 (OpenDirect.v2.1.final.md); 1.5.1 is the last version with a Swagger contract
  vast:
    current: VAST 4.3 (schemas/ directory) with XSDs published for 4.1, 4.2 and 4.4
  agentic_primitives:
    scheme: semver; a breaking schema change (any golden fixture or wire-shape change) is a major bump; agents pin a compatible range
    current: v0.5.1 (2026-08-10), pre-release ahead of 1.0 standardization
  seller_agent:
    scheme: semver, tagged GitHub releases, Keep-a-Changelog CHANGELOG.md
    current: v2.4.2 (2026-08-18)
deprecations:
- surface: seller-agent MCP HTTP+SSE transport (/mcp-sse/sse, protocol 2024-11-05)
  status: deprecated, kept for backwards compatibility
  replacement: /mcp/ Streamable HTTP (protocol 2025-06-18)
  source: https://iabtechlab.github.io/seller-agent/api/mcp/
- surface: seller-agent admin routes without operator credentials
  status: breaking change in 2.4.0 (2026-08-04) — API key lifecycle, event log, rate-card writes, registry and package mutations now require an operator key
  source: https://github.com/IABTechLab/seller-agent/blob/main/CHANGELOG.md
- surface: OpenRTB 2.x community extension deprecation labels
  status: extensions carry an explicit deprecation test label process (extensions/community_extensions/deprecation_test_label.md)
  source: https://github.com/InteractiveAdvertisingBureau/openrtb/tree/main/extensions/community_extensions
deprecated_operations: []
deprecation_policy: >-
  No single published deprecation or sunset policy (no Sunset / Deprecation headers documented). Standards
  evolve through working groups with public-comment periods; OpenRTB's README states versions increment only
  on breaking changes, and the primitives README makes any wire-shape change a major bump.
status_page: null
sla: null