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[FEATURE]:Feature Request: UI Plugin API for rendering custom components in message parts #20034
Closed as not planned
Description
Feature hasn't been suggested before.
- I have verified this feature I'm about to request hasn't been suggested before.
Describe the enhancement you want to request
Problem
The current plugin system only supports the AI/backend side (system prompts, tools).
There's no way for a plugin to inject custom UI components into message rendering
without forking the entire repo and modifying message-part.tsx directly.
Proof of Concept
I built a working fork that adds rich UI rendering to OpenCode:
https://github.com/Nihalmai/opencode-plugin-update
It renders weather cards, charts, tables, metrics, progress trackers,
forms, and more — all inline in the chat, triggered by LLM output.
What I'm asking for
A simple registerRenderer hook in message-part.tsx, something like:
// In a plugin:
opencode.registerRenderer((text) => {
if (text.includes("---A2UI-START---")) {
return <MyCustomRenderer text={text} />
}
})Why this matters
- Plugins could render rich UI without forking
- The ecosystem opens up massively
- My fork shows it works and users love it
Would love to contribute this directly if the team is open to it.
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github-actions commentedon Mar 30, 2026
This issue might be a duplicate of existing issues. Please check:
These issues cover very similar ground — enabling plugins to render or inject custom UI without forking the repo. Consider adding your use case as a comment on one of the above, or the maintainers may close this as a duplicate.
github-actions commentedon Jul 3, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.