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## Why Replaying tool outputs under a different model can expand or shrink the history shown to the model if truncation uses the new model's budget. ## What changed Save the originating history truncation budget on function and custom tool outputs and reuse it during replay, preserving existing tool-specific overrides. Include the existing 20% serialization allowance once, before converting byte budgets to tokens. Rename the metadata field to `history_truncation_token_limit` while retaining `fallback_token_limit_override` as its serialized name for compatibility. ## Testing Add regression coverage for resume and fork with different model budgets, including custom tool outputs. Extend unit coverage for existing overrides and byte-budget conversion. GitOrigin-RevId: a62c8fd3e43198e2252b150fba72f022939c1070