build1 distinct publisher
Claude's prompt cache dies quietly in agent loops: the 20-block lookback nobody configures
A dev.to writeup documents why cache_read_input_tokens falls to zero mid-run: a cache_control breakpoint walks back at most 20 content blocks, and parallel tool calls clear that in one turn.
Publishers:dev.to
Reality
- Evidence28
- Adoption
- Insufficient
- Hype gap+27
- Incentives34
- Confidence33