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magic-compact
Magic Compact is a plugin for OpenCode and Claude Code that compresses conversation history by replacing old assistant turns with summaries while preserving user messages and tool structure, enabling lossless context compression.
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License
BSD-3-Clause
Last updated
2026-07-24
AI repository intelligence
FR-AI / ANALYSISWhy it is worth attention
It offers a novel approach to context compression that preserves the conversation skeleton and retrievability, unlike built-in compaction that flattens everything. It is lightweight, zero-overhead, and designed to maintain agent memory without amnesia.
Who it is for
- Developers using OpenCode or Claude Code for extended coding sessions
- AI agent users who need to manage long conversations efficiently
- Users frustrated with built-in compaction losing context details
- Plugin developers interested in context management techniques
Use cases
- Compressing long agent sessions without losing critical details
- Preserving user commands and tool calls while reducing token usage
- Recompacting after adding new turns to maintain manageable context length
- Retrieving pruned tool outputs on demand via read_omitted_content tool
Strengths
- Lossless compression: maintains turn-by-turn flow and retrievability of pruned data
- Zero compaction overhead: compaction triggered manually, not during agent loop
- Preserves user messages verbatim, keeping requirements visible
- Recompactable: can apply compression again on new turns
Considerations
- Claude Code version does not compact in place and requires manual session resume
- Magic-stats feature is exclusive to OpenCode
- Relies on optional tool (read_omitted_content) for retrieving pruned content, which agent may need to call
README quick start
Installation
Description
Lossless context compression plugin for OpenCode.
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