Repository navigation
tool.execute.after hook: UI renders metadata.output instead of output, ignoring mutations #13575
Description
Description
The tool.execute.after plugin hook can mutate output.output on the result object, and the mutation correctly propagates to Session.updatePart({ state: { output: value.output.output } }). However, the TUI renders metadata.output instead of state.output for bash tools, so the mutation is never visible to the user.
In packages/opencode/src/cli/cmd/tui/routes/session/index.tsx, the Bash component reads:
const output = createMemo(() => stripAnsi(props.metadata.output?.trim() ?? ""))But the bash tool sets metadata.output as a separate string copy at execution time, before the hook runs:
// packages/opencode/src/tool/bash.ts
return {
title: params.description,
metadata: {
output: output, // ← snapshot before hook
exit: proc.exitCode,
},
output, // ← this gets mutated by the hook, but UI doesn't read it
}So even though the hook successfully mutates result.output, the UI never shows the change because it reads metadata.output which still has the pre-hook value.
Plugins
OpenCode version
1.2.1
Steps to reproduce
- Create a plugin that appends text to
output.outputintool.execute.after:
"tool.execute.after": async (input, output) => {
if (input.tool !== "bash") return
const text = output.output ?? ""
if (text.includes("Operation not permitted")) {
output.output = text + "\n\n⚠️ Annotation from plugin"
}
}- Run a bash command that produces "Operation not permitted" in its output
- Observe that the annotation does not appear in the TUI output panel
Expected: The annotation appears in the displayed output.
Actual: The TUI renders metadata.output (pre-hook snapshot) instead of state.output (post-hook mutated value).
Screenshot and/or share link
No response
Operating System
Ubuntu 24.04 (Linux 6.8.0-100-generic)
Terminal
Ghostty
Activity
isanchez31 commentedon Feb 14, 2026
Local Validation
I patched the installed plugin to log diagnostic data after the
tool.execute.afterhook runs. Here's the sanitized output from two consecutive blocked bash commands (curl google.com):Key findings
mutatedtrue— the hook successfully modifiedoutput.outputoutput.output⚠️ [opencode-sandbox] ...annotationoutput.metadata.outputbwrap: ... Operation not permitted— no annotationmetaBefore === output.metadata.outputtrue—metadata.outputwas never changed by the hookoutput.output === output.metadata.outputfalse— they diverge after mutationDebug patch used
Conclusion
This confirms that:
output.outputcorrectlyoutput.metadata.outputis a separate string reference assigned before the hook runsoutput.outputcreates a new reference without affectingmetadata.outputmetadata.output→ the annotation is never displayedEnvironment: OpenCode 1.2.1, Linux (bwrap sandbox), [email protected]
github-actions commentedon Apr 16, 2026
To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.