weichenandCursor
a3f0b80759
Why: Tool-call history is flattened into assistant text, so the model imitates calls and invents artifact ids. The fix belongs to a shared harness, not another prompt tweak. Evidence: Proposal 2026-10-01-agent-harness.md records the 2026-10-01 session evidence, the ZCode and Claude Code patterns, and the P0-P4 acceptance. Impact: Documents only. P0 code lands in the backend on the same branch name. P1-P4 are not implemented here. Refs: feature/agent-harness-p0 Co-authored-by: Cursor <cursoragent@cursor.com>