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feat(core): replace instruction checkpoints with value-delta sync (#36254)

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Kit Langton 2026-07-10 13:26:25 -04:00 • committed by GitHub
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@ -114,22 +114,24 @@ and file or media attachments become textual descriptors rather than embedded
data. On later compactions, V2 updates the previous summary and carries forward
its retained recent context before selecting a new tail.
The completed checkpoint is presented to the model as historical conversation
The completed compaction is presented to the model as historical conversation
context, explicitly not as new instructions. Running and failed compactions are
not included in model context.
## Instructions and checkpoints
## Compaction advances the instruction epoch
Conversation compaction and the durable instruction checkpoint are separate.
Before each model step, V2 compares live instruction sources with what that
session's model was last told. Ordinary changes are durable chronological
system updates and do not rewrite the established instruction baseline.
Conversation compaction and instruction synchronization are separate. Before
promoting pending input, V2 compares live instruction sources with the latest
admitted values. Ordinary changes become durable value deltas; their
model-facing System messages are derived during request assembly rather than
persisted.
After a completed compaction, the next model step creates a fresh instruction
baseline from current sources. If a source is temporarily unavailable, V2
restates the last-applied value instead of treating it as removed. Session
movement and a committed revert reset the instruction checkpoint as well. See
[Instructions](/instructions) for source ordering and update behavior.
Completed compaction advances the instruction epoch at the exact ended-event
sequence and makes the currently admitted values initial. It does not reread
sources or publish an instruction event. Session movement and committed revert
clear the instruction fold so the next safe boundary requires one complete
source read. See [Instructions](/instructions) for source ordering and update
behavior.
## Current limitations