Patrick Buckley
6c4c848a08
fix(session): survive tool-result truncation at zero context budget ( #883 )
...
At an exhausted context budget the drain loop replaced every tool result
with a placeholder that read as a successful-but-trimmed call. For
structural results — spawn_workstream's ws_id, the tasks scratchpad —
the model lost the handle orchestration depends on and silently
stalled, while the UI (told the real summary before the drain) kept
showing success. Worse, the budget zeroes near 70% fullness when
max_tokens ≥ context_window/4, well below the 80% auto-compact
threshold, so a stalled coordinator could sit in that band indefinitely
with no compaction ever firing.
Three guarantees at the truncation seam, one renewal trigger at the
drain:
- structural-tool and error results get a guaranteed 2048-char
admission floor (head+tail beyond it) — never the zero-budget drop
- any result at or under the floor passes verbatim (denial notices,
spawn acks: never destroy what is smaller than the guarantee)
- bulky non-structural results get an explicit drop notice stating the
call RAN but its output could not be admitted — never a trim
impersonation the model cannot distinguish from success
- a zero truncation budget triggers one mid-turn compaction (no
threshold_pct — none was evaluated, same rule as the ctx-overflow
retry), closing the 70-80% band where the budget zeroed but
compaction was never owed
Background-bash spawn acks ride the small-result pass; a name-keyed
floor cannot distinguish them from foreground bash — see #891 .
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