- Replaced commit-based stability checks with a unified `isTranscriptBlockFinalized` tracking mechanism.
- Removed deprecated provisional rendering configuration and flags across tool and renderer interfaces.
- Standardized native scrollback boundary logic to pin at the first unfinalized block using settled row verification.
- Updated and refactored test suites to validate block finalization and settled row boundaries instead of deprecated commit stability methods.
The eval tool's live agent()/parallel() subagent progress tree
(renderAgentProgressEvents) mutates on almost every progress tick: each
subagent's row inserts/removes a "current tool" line as it starts/stops a
tool call, and ticks its status icon/stats/duration in place. Meanwhile
options.isPartial holds true for the whole eval() cell — progress ticks
never carry an async completed/failed state, so the update handler keeps
passing isPartial: true throughout.
evalToolRenderer never opted out of the transcript's stable-prefix ratchet
for partial results, so ToolExecutionComponent.isTranscriptBlockCommitStable()
reported the block commit-stable during that churn. That let
deriveLiveCommitState promote still-mutating agent rows into native
scrollback (a "slow ticker"), and the renderer's committed-prefix resync
then repeatedly re-showed the frame tail under its "duplication, never
loss" contract — producing overlapping/duplicated subagent rows in the
TUI under heavy concurrent agent()/parallel() fan-out.
Set provisionalPartialResult: true on evalToolRenderer, the same opt-out
sshToolRenderer already uses for this class of bug (see the "pinned
expanded pending preview commit-unstable" fix). The block now stays
commit-unstable until the eval cell settles, keeping agent-progress rows
in the live, repaintable region for their whole lifetime.
Added eval-commit-stability.test.ts covering: partial → commit-unstable,
settled → commit-stable, non-opted-in tools (bash) unaffected, and
commit-unstable held across row-count/content churn between two partial
ticks.
Op: correct
Restores: spec:eval agent-progress rows must not be promoted into native scrollback while still mutating
can1357