What it is
A stock Pi 0.85.1 extension for developers managing long agent sessions. It keeps conversation text verbatim while pruning stale tool history, falling back to Pi's built-in summary compaction only when pruning cannot free enough context.
How it uses Jev
Jev receives a compact representation of tool calls and surrounding conversation at /v1/systemone. Two noul questions per eligible tool call decide keep the call and keep its result. Decisions map to keep, drop_result, or drop_call and are stored as append-only fast-jev-decisions entries.
Primitives:noul
Technique worth stealing
Append-only decision ledger rebuilt from the session branch, filtering only model context and never rewriting the JSONL session file.
Try it
pi install git:github.com/joelhooks/pi-fast-jev-compaction, or pi -e git:github.com/joelhooks/pi-fast-jev-compaction
Evidence
Each line is one question put to Jev about the README. ≥ 0.60 reads as yes, ≤ 0.40 as no; in between Jev is not making a call.
- Jev-centricyes0.87
- Shows a System One patternyes0.82
- Handles uncertaintyyes0.81
- Measuredno0.05
- Runnableyes0.97
- Worth recommendingunclear0.43
- Model replicano0.03
- Problem scopescore on a 0–2 scale1.16
- About Jevyes0.98
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.