Real file from a public repo · synced Sep 3, 2026
primitives
Builds and customizes assistant-ui chat UI from composable, unstyled @assistant-ui/react primitives that follow Radix-style part composition. Use when assembling or styling a custom Thread, Composer, message rendering, action bar, or branch picker from building blocks: ThreadPrimitive (.Root, .Viewport, .ViewportFooter, .Messages, .Empty, .ScrollToBottom, .Suggestions), ComposerPrimitive (.Input, .Send, .Cancel, .Attachments, .AddAttachment, .AttachmentDropzone, .Quote, .Dictate, .Queue), MessagePrimitive (.Parts/.Content, .GroupedParts, .Attachments, .Quote, .GenerativeUI, .Error), ActionBarPrimitive (.Copy, .Edit, .Reload, .Speak, .StopSpeaking, feedback, .ExportMarkdown), BranchPickerPrimitive, AttachmentPrimitive, ThreadListPrimitive, ThreadListItemPrimitive, plus ChainOfThoughtPrimitive, SelectionToolbarPrimitive, SuggestionPrimitive, QueueItemPrimitive, ErrorPrimitive, and AssistantModalPrimitive. Covers MessagePrimitive.Parts children render functions for text, image, reasoning, tool-call, data, and generative-ui parts; part grouping with groupPartByType (the \"mcp-app\" key was removed in 0.15, use \"standalone-tool-call\"); conditional rendering with AuiIf (deprecated .If); and gotchas like wrapping in AssistantRuntimeProvider and adding className since primitives ship unstyled. For prebuilt drop-in UI and scaffolding use setup; for multi-thread sidebar behavior use thread-list.
Works with
Install in three steps
- 1
Download the ZIP
One file per agent, plus INSTALL.md with the exact paths below.
- 2
Claude Code: copy SKILL.md into your skills folder
.claude/skills/primitives/SKILL.md # this project ~/.claude/skills/primitives/SKILL.md # every project
- 3
Other agents: use the matching file
skill.mdc goes in Cursor’s .cursor/rules/. AGENTS.md works as GitHub Copilot instructions, a legacy .cursorrules, or a Codex / Gemini CLI instructions file.
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