Files
buzz/crates
563e4346da Reduce repeated ACP session context (#5423)
## Summary

- deliver legacy ACP standing context once per live session, committing
delivery state only after a successful turn
- send only new thread/DM event deltas on later turns, with fail-open
behavior for missing IDs and failed/cancelled prompts
- fence native steer delivery acknowledgements by ACP session identity
so stale acks cannot poison replacement sessions
- keep context hints truthful when a fetch contains only the triggering
event versus history delivered earlier

## Validation

The pre-push hook passed on exact pushed head
`6a768f1bc80fe63c686acf8d730f177fff8add3c`:

- `branch-skew`
- `desktop-check`
- `desktop-typecheck`
- `desktop-test`
- `rust-tests`
- `desktop-tauri-checks`

Focused regression tests were also run while iterating:

- `channel_prompt_commits_delivery_state_only_after_acp_success`
- `in_flight_stale_native_steer_ack_cannot_update_replacement_session`
- thread/DM trigger-only versus previously-delivered context hint tests

## Known limitations and follow-ups

A local Goose smoke timed out at `session/new`. This diff does not
change code that executes at or before `session/new`; its earliest
affected runtime behavior is delivery-state insertion after session
creation succeeds. The smoke failure is therefore bounded as
environmental or pre-existing, but no successful live-provider turn was
obtained. Scripted ACP wire/lifecycle tests carry the regression
coverage.

- #5421 — distinguish post-delta, already-delivered, and fetch-truncated
context counts
- #5422 — define a standing-context re-delivery policy if a legacy
provider compacts it away

Durable process-restart/session resume remains out of scope for this
slice of #5342. #5386 also remains separate pending upstream adapter
support.

---------

Signed-off-by: Wes <wesbillman@users.noreply.github.com>
Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>
2026-08-10 08:50:34 -07:00
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