What happens if Jev is unavailable?

The plugin declines and OpenCode falls back to its built-in summarization, so compaction either preserves content exactly or behaves as if the plugin were not installed.

Are user and assistant messages modified?

No. Only tool calls and tool results are candidates for removal or truncation; text parts are never edited, reordered or shortened, and the newest six messages plus the first are pinned.

What exactly are the two Jev questions per tool call?

For each unpinned call it asks whether knowing the call was made still matters and whether the full output is still needed verbatim. Above keepThreshold on the output the call is kept, above it only on the call the output is truncated, and below both the call and its output are removed.

When does the plugin give up and let OpenCode summarize?

When Jev is unavailable or fails, or when the estimated character reduction is below minReductionRatio, 0.25 by default. It then declines and OpenCode uses its built-in summary, so a compaction either preserves content exactly or behaves as if the plugin were absent.

Which messages are protected from pruning?

The first message is always pinned, and the newest preserveRecentMessages messages, 6 by default, are pinned too. Pinned content is never a candidate for removal, and user and assistant text is never edited, reordered or shortened.

What limits the size of the Jev request?

maxStateTokens defaults to 25,000 and maxRequestTokens to 30,000 for state plus one batch of questions. To fit the budget it replaces tool outputs with size notes, abridges long texts and collapses old messages in stages, and truncateHeadChars keeps 300 characters of a dropped output.

How do I install it and confirm it loaded?

Run opencode plugin add github:radqnico/opencode-jev-compaction, export TYPESAFE_API_KEY, restart the service and run opencode plugin list. For a local checkout you can point a plugin entry at the directory instead, and OpenCode loads the TypeScript sources with no build step.

CommunityJev Tools & CLIs

OpenCode Jev Compaction

OpenCode plugin that replaces LLM compaction summaries with Jev keep/drop judgments: stale tool calls and outputs are pruned while user and assistant text is preserved verbatim, falling back to the built-in summary when Jev cannot help.

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Stars: 1
Language: TypeScript
License: MIT
Published by: Community
Last verified: Oct 2026

radqnico/opencode-jev-compaction

User repository on GitHub

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OpenCode plugin that compacts with Jev instead of summarizing: drops stale tool calls/results, keeps the rest word for word.

Forks: 0
Last pushed: Updated Sep 2026

Repo stats from the GitHub API, cached Oct 2026.

About this project

An OpenCode plugin that compacts sessions by pruning with TypeSafe Jev instead of summarizing with an LLM. Tool calls Jev no longer considers relevant are dropped or truncated; everything kept is preserved verbatim.

Quoted from the project's README. Read the full README.

Tagscommunity opencode compaction plugin

Works forJev for Code

Used inJev for Software & DevTools

Languages: TypeScript
Capabilities: Open sourceRequires API key

Highlights

Asks Jev two yes/no (noul) questions per unpinned tool call: whether the call still matters and whether its full output is still needed
Default keepThreshold 0.5; below it on output the call stays truncated, below both the call and its output are removed
Declines when estimated reduction is under minReductionRatio 0.25 and lets OpenCode's built-in summary run instead
State budget defaults to 25,000 tokens and requests to 30,000; model, baseUrl and headers configurable in opencode.jsonc
Ports the pruning algorithm of tamaratran/fast-jev-compaction to OpenCode's compaction hook, MIT-licensed

Watch out

MIT license. OpenCode's hook accepts only a summary string, so the pruned transcript is stored as compaction content rather than replacing history; a TypeSafe key is required.

Questions about this entry

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X: The compaction plugin, in Chinese

X: The compaction plugin, in Spanish

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