feat: use agent description as prompt placeholder #8788
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- Show agent description in placeholder when available - Fall back to randomized hints for build agent or no description - Implement in both CLI (TUI) and app (web) components - Add .padEnd(70) workaround for text rendering ghosting bug Fixes issue where switching agents caused visual corruption with ghost characters from previous placeholder remaining visible. TODO: Find proper fix for text layout cache invalidation instead of padding workaround.
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Thanks for your contribution! This PR doesn't have a linked issue. All PRs must reference an existing issue. Please:
See CONTRIBUTING.md for details. |
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The following comment was made by an LLM, it may be inaccurate: No duplicate PRs found |
JosXa
commented
Jan 16, 2026
| // placeholder remain visible when switching to shorter text. Browser doesn't properly | ||
| // clear cached text layout with truncate/ellipsis CSS. Proper fix would be to force | ||
| // element recreation or use a different rendering approach. | ||
| return `Ask anything... "${PLACEHOLDERS[store.placeholder]}"`.padEnd(70, " ") |
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Please advise. I'm not sure how to get around this ghosting of the previous cycle without the padEnd hack:
WindowsTerminal_genyHK2HUT.mp4
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Prompted opencode for it and it had no idea after 10 attempts.
JosXa
commented
Jan 16, 2026
| if (params.id) return | ||
| if (params.id || !shouldRotatePlaceholder()) return | ||
| const interval = setInterval(() => { | ||
| setStore("placeholder", (prev) => (prev + 1) % PLACEHOLDERS.length) |
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/oc Ah, I suppose we should only increment the placeholder index when we actually saw a placeholder
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Summary
Implements dynamic placeholder hints that display the current agent's description instead of static randomized hints, except in build mode.
Closes #8804
WindowsTerminal_NgMLh7dY26.mp4
Changes
Implementation Details
CLI/TUI (
packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx)placeholderTextmemo that reactively returns agent description or randomized hintWeb App (
packages/app/src/components/prompt-input.tsx)placeholderTextmemo with same logic as CLIshouldRotatePlaceholdermemo to control hint rotationKnown Issues & Workarounds
Text Rendering Ghosting Bug
When switching between agents, ghost characters from the previous placeholder could remain visible due to browser/terminal text layout caching.
Workaround: Added
.padEnd(70, " ")to force full-width text rendering which overwrites stale cached text.TODO: This is a temporary fix. Investigate why OpenTUI textarea / browser doesn't invalidate text rendering cache, it should properly flush the input.
Testing
Files Changed
packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx(+14, -1)packages/app/src/components/prompt-input.tsx(+23, -4)