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Patrick Buckley
6c4c848a08
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.