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CommunityTools & Integrations10 starsVerified 2026-09-22

pi-fast-jev-compaction

A Pi extension that keeps conversation text verbatim while pruning stale tool history with Jev keep-or-drop decisions, falling back to Pi's built-in summary compaction when pruning cannot free enough context.

Open github.comjoelhooks/pi-fast-jev-compaction
Category
Tools & Integrations
Published by
Community
Author
joelhooks
Added
2026-09-22
Tagscommunitytypescriptcompactioncoding-agentagents

Highlights

  • Asks two noul questions per eligible tool call - keep the call and keep its result - then applies keep, drop_result, or drop_call.
  • Keeps the first message and recent messages pinned and filters only the context sent to the model; it never rewrites the JSONL session file.
  • Decisions are stored as append-only fast-jev-decisions entries, and the ledger rebuilds after startup, reload, resume, fork, or tree navigation.
  • Defaults include keepThreshold 0.5, preserveRecentMessages 6, compactAtPercent 60, truncateHeadChars 300, and a minReductionRatio of 0.25.
  • It fails open: a missing key, malformed response, timeout, abort, network error, or insufficient reduction leaves Pi's summary path available.

Quickstart

bash
pi install git:github.com/joelhooks/pi-fast-jev-compaction
pi -e git:github.com/joelhooks/pi-fast-jev-compaction   # one run without installing
export TYPESAFE_API_KEY=YOUR_API_KEY

Watch out

MIT-licensed with the decision core ported from tamaratran/fast-jev-compaction; needs Node 24.18 and Pi 0.85.1 plus TYPESAFE_API_KEY, every ledger edit invalidates the provider's prompt cache from the first edited message, and decisions are model judgments, not proofs.

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