Claude Code 2.1.154–2.1.158 streaming tool-result delivery regression — probe + side-by-side evidence + workaround (and what you give up by pinning to 2.1.153)
Claude Code versions 2.1.154 through 2.1.158 contain a regression that corrupts the streaming delivery of tool results back to the model, causing results to arrive empty-then-late in bursts, duplicate inline blocks up to…