Two clean-room reimplementations layered onto the native `!task` loop
(`_run_native`), aimed at lifting a weak CPU-bound local model's autonomous
pass rate. No code copied from the GPL sources studied; MIT throughout.
NightShift-derived verify-then-repair gate:
- `_classify_failure` maps a failing tool result to a (category, fix-hint) so
the repair nudge names a concrete cause/next-action instead of "exited N".
- `_relevant_excerpt` keeps the error-relevant tail of a FAILING run_shell
result within the byte budget (the real error is usually at the tail).
- read-dedupe guard short-circuits repeated idempotent `read_file` of a path
already read this task.
Exoshell-derived context discipline:
- `_prune_native_messages` budgets the whole message list (~chars/4) and
evicts oldest removable turns first once over `native_token_budget`,
pinning index 0, the TASK_MARKER goal, and the most-recent turns — the
native loop previously grew unbounded, silently pushing the goal out of a
small model's window on long repair runs.
- TASK_MARKER labels the goal so it is never pruned and re-anchors the model.
- REPAIR_STANCE is appended to the turn system prompt after the first failure
to swap the whole turn into a diagnose-then-act posture.
Validated on qwen2.5-coder:3b: clean unstitched 7/9 (the local ceiling), no
regression vs baseline; unit-tested pruning (pin survival, oldest-first
eviction, under-budget no-op) and stance trigger. The two remaining fails are
exact-match correctness tasks (a count, a fibonacci string), not harness gaps.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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