Why: user selected evaluating whether MiniMax tool_calls + Usage + clean EOF can count as completion Evidence: r0.4/r0.5/r0.6 probe receipts; MiniMax OpenAPI spec fetched 2026-10-19 Impact: docs and task card only; no code or paid requests Refs: .task/feature-fast-slow-completion-signal-eval.md Co-authored-by: Cursor <cursoragent@cursor.com>