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Fast Jev Compaction
Fast Jev Compaction: Claude Code plugin and npm library that replaces compaction summaries with Jev decisions instead of lossy rewriting.
Fast Jev Compaction replaces Claude Code's built-in compaction summary with Jev decisions. Every tool call and result is scored in a fast request, and stale ones are dropped or truncated while everything else stays verbatim. User and assistant text remains untouched and in order. The repository functions as both an npm package and a Claude Code plugin. It handles transcripts by pinning recent messages, fitting the conversation into token limits, and sending questions to the Jev model.
Fast Jev Compaction at a glance
Key features
- Scores every tool call and result in a fast request
- Drops or truncates stale tool calls and results
- Keeps user and assistant text verbatim
- Pins the newest preserveRecentMessages messages
- Fits conversation state into configurable token ceilings
- Splits questions into concurrent requests
- Reports message and character count statistics
Use it for
- Replacing Claude Code compaction summaries
- Compacting session transcripts via npm library
- Scoring and filtering old tool calls
Companions
Tools that articles about Fast Jev Compaction recommend using with it, each with its job.
- Claude Code — Built to work with Claude Code.
- Jev — Built to work with Jev.
- Context7 — Provides up-to-date documentation for AI agents and code editors.
- Playwright MCP — Enables LLMs to interact with web pages using structured accessibility snapshots.
- GitHub MCP Server — Reads pull requests, issues and code search on GitHub.
- Superpowers — Brainstorm, plan and execute skills for bigger tasks.
Alternatives to Fast Jev Compaction
- Compactly — Compacts sessions at natural breaks and shows turn costs and cache expiration.
- Catnap — It prevents mid-task interruptions by letting Claude finish its current piece of work before compacting.
- Claude Code Mode — Reduces context token usage by returning only the final program result.
- claudecode.nvim — Adds native AI coding assistant functionality to Neovim.
- jevgrep — Reduces coding agent costs by providing targeted, relevant repository context.
- Effortless — It selects the reasoning effort for every prompt and lowers costs.
- ZCF — It completes end-to-end environment initialization and proxy setup within minutes.
- Codex Plugin for Claude Code — Delegate tasks and run code reviews with Codex directly inside Claude Code.
- Claude Context — It reduces token costs and provides deep context for large codebases.
- mcp-router — Reduces Claude Code tokens by 13% to 44% using tool search and JSON shaping
- My Claude Code Mods — Adds detailed session profiling, timeline snapshots, and loop detection to Claude Code.
- Edgee Mod for Claude Code — Manage models and track token cost savings inside your terminal conversation.
All Fast Jev Compaction alternatives