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OpenCode 2: model-echoed §N§ tags are never stripped from saved assistant text #613
Description
Activity
Thanks for tracing this. You're right about the cause. On OpenCode 1, Magic Context removes the tags a model writes into its reply before the text is saved, through the
experimental.text.completehook. OpenCode 2 has no hook that runs between the parsed reply and saving it, so there's currently no reliable way for a plugin to change the assistant text OpenCode 2 saves and shows. A plugin can rewrite the raw provider stream before parsing, but that depends on each provider's stream format and breaks when a tag is split across stream events. So for now the tag stays visible in the OpenCode 2 transcript; the model still sees its own text unchanged.Not prefixing assistant text on OpenCode 2 (#593) isn't an option, because the agent needs those tags to drop its own messages with
ctx_reduce.We've asked OpenCode for a hook in anomalyco/opencode#53019, preferably one that runs before assistant text is displayed, or else a
text.completeequivalent. If you're affected, a 👍 there helps. We're keeping this issue open until OpenCode 2 has a hook we can use.
What happened?
Magic Context: 0.44.4 installed; also checked at
main0037574 (2026-10-03)OpenCode: 2.0.22
Found by: reading source. Not yet observed in a live session. Related to #582 (which covers the WebSocket cache side) and the closed, unmerged PR #593.
What happens
On OpenCode 1, MC strips §N§ tags the model echoes into its own text at the persistence boundary, via
experimental.text.complete(index.ts:996,text-complete.ts). OpenCode 2 has no equivalent hook: its session hooks areprompt,context,compaction,generate,title,model.request,http.request,http.response, the experimentalws.*hooks andretry(packages/plugin/src/promise/session.ts), and there's notext.complete. The V2 entry registers nothing in its place, so echoed tags are saved insession_messageand shown in the transcript.Suggested fix
http.responsehook, or a post-step rewrite if the host exposes one). If no hook can do it, document the limitation.Reproduce
Run an OpenCode 2 session with
ctx_reduceavailable until the model echoes a §N§ tag in its reply. The stored assistant text insession_messagestill contains it, and the timeline shows it.