fix: head+tail truncation for execute_code stdout (inspired by openclaw context-pruning)#755
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fix: head+tail truncation for execute_code stdout (inspired by openclaw context-pruning)#755teknium1 wants to merge 1 commit into
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…aw context-pruning) Previously, _drain() only captured the first MAX_STDOUT_BYTES (50KB) of stdout, silently dropping all tail output. Scripts that print() their final results at the end would have those results lost. Now uses a two-buffer approach: 40% head + 60% tail (rolling window). This matches the pattern already used in terminal_tool.py (line 1042-1051) but gives the tail more space since execute_code scripts typically print() their final results at the end. Inspired by openclaw's softTrim context-pruning (headChars/tailChars).
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Replaces head-only stdout capture with a two-buffer approach (40% head, 60% tail rolling window) so scripts that print() their final results at the end never lose them. Adds truncation notice between sections. Cherry-picked from PR #755, conflict resolved (test file additions). 3 new tests for short output, head+tail preservation, and notice format.
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Replaces head-only stdout capture with 40/60 head/tail split so final print() output is never lost. 3 new tests.
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Merged to main in 359352b. Head+tail truncation for execute_code stdout — cherry-picked and conflict resolved against current main. |
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Apr 27, 2026
Replaces head-only stdout capture with a two-buffer approach (40% head, 60% tail rolling window) so scripts that print() their final results at the end never lose them. Adds truncation notice between sections. Cherry-picked from PR NousResearch#755, conflict resolved (test file additions). 3 new tests for short output, head+tail preservation, and notice format.
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… stdout Replaces head-only stdout capture with 40/60 head/tail split so final print() output is never lost. 3 new tests.
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Replaces head-only stdout capture with a two-buffer approach (40% head, 60% tail rolling window) so scripts that print() their final results at the end never lose them. Adds truncation notice between sections. Cherry-picked from PR NousResearch#755, conflict resolved (test file additions). 3 new tests for short output, head+tail preservation, and notice format.
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… stdout Replaces head-only stdout capture with 40/60 head/tail split so final print() output is never lost. 3 new tests.
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Replaces head-only stdout capture with a two-buffer approach (40% head, 60% tail rolling window) so scripts that print() their final results at the end never lose them. Adds truncation notice between sections. Cherry-picked from PR NousResearch#755, conflict resolved (test file additions). 3 new tests for short output, head+tail preservation, and notice format.
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… stdout Replaces head-only stdout capture with 40/60 head/tail split so final print() output is never lost. 3 new tests.
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Replaces head-only stdout capture with a two-buffer approach (40% head, 60% tail rolling window) so scripts that print() their final results at the end never lose them. Adds truncation notice between sections. Cherry-picked from PR NousResearch#755, conflict resolved (test file additions). 3 new tests for short output, head+tail preservation, and notice format.
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… stdout Replaces head-only stdout capture with 40/60 head/tail split so final print() output is never lost. 3 new tests.
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Summary
Previously,
execute_code's_drain()function only captured the firstMAX_STDOUT_BYTES(50KB) of stdout, silently dropping all tail output. Scripts thatprint()their final results at the end would have those results lost — a critical issue since execute_code scripts are designed to print their final output.Changes
_drain_head_tail()function: Uses a two-buffer approach — a head buffer (first 40%) and a rolling tail deque (last 60%). Memory usage stays bounded.[OUTPUT TRUNCATED - N chars omitted out of M total]between head and tail sections.Rationale
terminal_tool.pyalready does head+tail truncation (40% head / 60% tail at line 1042-1051), butcode_execution_tool.pywas head-only. The tail is actually more important for execute_code since scripts print their final result at the end.Inspired by openclaw's
softTrimcontext-pruning (headChars/tailCharssplit in v2026.3.7).Tests