@papercusp/agent-chat

Reusable chat UI for harness/director agents. Built on @assistant-ui/react with custom action-block rendering for patch: and promote: blocks emitted by agent runtimes.

Exports

• HarnessChat — main chat surface
• PatchBlock, PromoteBlock — action block renderers
• useHarnessChatRuntime — runtime hook (streaming, action parsing)
• type ActionBlock — discriminated union of supported action shapes

Repos using this lib

• papercupai/papercup — main monorepo (admin harness UI)
• papercupai/papercup-public-site — papercupai.com (public harness mirror)

Both consume this lib via git submodule at libs/agent-chat/.

Peer deps

• react ^18 || ^19
• @assistant-ui/react (any version, host's choice)
• lucide-react
• sonner