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Review's system text is missing from compaction and warming requests, which breaks prompt caching #53
Description
What happened
On OpenCode 2, the review plugin adds its guidance to the system prompt using only the context hook (index.ts#L312). Compaction and session warming build their requests through the compaction and generate hooks, so their system prompt is different and they miss the prompt cache. OpenCode fixed the same problem in its own plugins in anomalyco/opencode#48749.
Registering the same handler on all three hooks fixes it:
await ctx.session.hook("context", addSystem)
await ctx.session.hook("compaction", addSystem)
await ctx.session.hook("generate", addSystem)Steps to reproduce
Use ctrl+p and enable "Developer tools". In the developer menu, enable "Tools > Turn token usage".
- Enable
"warming": trueinopencode.json - Send a large prompt, then wait 9 minutes. I used a model with a 5 minute cache TTL.
- Send another prompt. Most of the conversation is written to the cache again instead of being read from it.
Versions
@opencode-cockpit/review 0.11.1 · OpenCode 2.1.3 · macOS 26.7.1
Daemon log
Activity
Codestz commentedon Oct 31, 2026
Thank you so much for this report @rzane, it's honestly one of the best I've received: a clear diagnosis, a pointer to the upstream fix, the exact patch, and steps to reproduce. That made this really easy. Sorry for the late answer. I got on it as soon as I saw it.
It's fixed in 0.11.2, which is out now (#54). Your diagnosis was spot on. It also went further than Review: Shell and Trail add system text the same way, so all three now register the handler on
context,compactionandgenerate.To be sure it actually fixes the cache miss, I tested it on OpenCode 2 with a small observer plugin. It logs each request's system block after every hook has run. I sent a prompt, then compacted the session:
Compaction and warming now send the same system prefix as the conversation, so they should read from the cache instead of writing it again.
Update with
opencode plugin add @opencode-cockpit/review@0.11.2, or let the updater pick it up. If you still see cache writes after a warm-up, please reopen this and I'll take another look. Thanks again! 🙏