Show HN Ships Compactdiff — a Tool That Shows You Exactly What Context Compaction Deleted From Your Agent Session
Show HN·low signal
Compactdiff, posted to Show HN within the last hour, diffs an agent session before and after compaction so you can see precisely which context the harness discarded. It is a small tool with almost no votes yet, but it names a real and mostly unmeasured failure mode: every long-running agent silently drops state at compaction time and nobody currently audits what went. Single-source and brand new, so treat traction as unproven — but it is the observability counterpart to this week's durable-state harnesses like prime-agent, which try to make context survive rather than showing you what didn't.