Architecture Development Notes

Oct 29, 2026 · R&D Management

Claude Code's Partial Load Bug: How Write Overwrites Unseen File Content

An analysis of a Claude Code bug where rule files exceeding context limits were only partially loaded via instruction injection, yet the Write tool's pre-check consulted a different registry — allowing full overwrites of unseen content until version 2.1.312 moved the integrity check to the write moment, requiring full reads or in-place edits.