What does the /fc command do?

It shrinks old tool output in a Claude Code session — file reads, logs and test runs Claude has already used — keeping only the start and end. Each cut names the file holding the full text, so Claude can read it back when needed.

How does fast-compact use Jev?

Jev, described in the README as a fast decision model, optionally picks which tool outputs to keep whole. Without Jev, the plugin still works entirely locally and nothing leaves your machine; with it, slightly more of what matters is kept.

Do I need an API key?

No. The README states no key is needed: the core compaction is local, and the Jev path is optional. That also means it can be adopted without signing up for anything, though the Jev threshold logic is not documented in the captured text.

Is it faster than Claude Code's /compact?

It solves a different problem. /fc cuts tool output in about a second and leaves the conversation itself alone; /compact summarises the conversation, which the README says takes a minute or more. The README recommends using both as needed.

How much context does it actually free?

Depends on the session. A session full of file reads, logs and test runs can drop by a third or more in one go, per the README; a mostly conversational session may free almost nothing. The repo's example screenshot shows 747k to 191k characters.

Does it lose information?

The README says nothing is lost: each cut is saved to a file and the cut itself names that file, so Claude reads the full text when it needs it. Only old tool output and long tool inputs are touched, never what you or Claude wrote.

Who built fast-compact and what licence is it under?

NodarDavituri built it. Metadata: TypeScript, MIT, 6 stars, 1 fork, created 2026-09-26 and pushed 2026-10-15. Topics include claude-code, claude-code-plugin, context-compaction, jev, openrouter and typesafe.

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Fast Compact

A Claude Code plugin whose /fc command shrinks old tool output in about a second: it keeps the start and end, saves every cut to a file Claude can read back, and an optional Jev pass picks which outputs to keep whole. No API key needed; /compact stays untouched.

See highlights Open github.com

Stars: 6
Language: TypeScript
License: MIT
Reading time: 3 min
Published by: Community
Author: nodardavituri
Last verified: Oct 2026

nodardavituri/fast-compact

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/fc for Claude Code: shrink old tool output in about a second — Jev keeps what's still needed, every cut saved to a file. Your /compact stays untouched.

Forks: 2
Last pushed: Updated Oct 2026

Repo stats from the GitHub API, cached Oct 2026.Homepage

Tagscommunity github typescript claude-code context-compaction

Works forJev for Code Jev for Classification

Used inJev for Software & DevTools

Languages: TypeScript
Platforms: CLI
Capabilities: Open sourceRuns locally

Highlights

/fc (or /fast-compact) cuts old tool output — file reads, logs, test runs — down to its start and end.
Each cut is saved to a file that Claude can read back, so nothing is lost; only tool output is shrunk.
Optional Jev pass: the decision model picks which outputs to keep whole; without Jev nothing leaves your machine.
Runs in about a second rather than the minute or more a summary takes, so it can be run repeatedly.
Screenshot example in the repo: 747k to 191k chars, context from 40% to 12% in one run.

Watch out

README reviewed 2026-10-17; the digest truncates the README mid-sentence in the 'how much it frees' section, so the install command and Jev configuration are not shown here. The 747k-to-191k figure is the repository's own screenshot from one session, not a benchmark, and savings vary by session.

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Fast Compact

Highlights

Questions about this entry

What does the /fc command do?

How does fast-compact use Jev?

Do I need an API key?

Is it faster than Claude Code's /compact?

How much context does it actually free?

Does it lose information?

Who built fast-compact and what licence is it under?

Reactions & coverage

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