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c97b36230e
Tail protection was effectively message-count based despite having a token budget, because protect_last_n=20 acted as a hard floor. A single 50K-token tool output would cause all 20 recent messages to be preserved regardless of budget, leaving little room for summarization. Changes: - _find_tail_cut_by_tokens: min_tail reduced from protect_last_n (20) to 3; token budget is now the primary criterion - Soft ceiling at 1.5x budget to avoid cutting mid-oversized-message - _prune_old_tool_results: accepts optional protect_tail_tokens so pruning also respects the token budget instead of a fixed count - compress() minimum message check relaxed from protect_first_n + protect_last_n + 1 to protect_first_n + 3 + 1 - Tool group alignment (no splitting tool_call/result) preserved