Changelog
All notable changes to the TCF specification.
v0.4.02026-06-01
- đ Added
tool_callandtool_resultcontent types for AI agent support - đ E2EE envelope specification using MLS
- đ Formalised the extension registry
- â ī¸ Breaking: Renamed
user_idtosender.idin envelope
v0.3.12026-03-15
- đ Fixed JSON Schema validation for optional fields
- đ Improved error code documentation
- đ WebSocket transport promoted to stable
v0.3.02026-01-20
- ⨠Added
systemcontent type for server events - đ Bidirectional streaming for gRPC transport
- â ī¸ Breaking: Changed message ID format to UUID v7
v0.2.02025-10-01
- đ Initial public draft release
- đ Core message envelope defined
- đ WebSocket and HTTP/2 transports
v0.1.02025-07-01
- đą Project inception. Internal draft.
âšī¸ TCF v1.0 is targeted for Q4 2026. See the roadmap for more details.