CopilotKit Showcase

One-liner to scaffold a new CopilotKit app via the official CLI

Beautiful Chat

Canonical polished starter chat (same as /examples/integrations/langgraph-python)

Chat & UI

Pre-Built: CopilotChat

Pre-built <CopilotChat /> component for full-screen/embedded chat

Platform

Browser Use

The agent drives a real local headless browser to fetch pages and renders the results inline in chat

Attachments

File upload and agent processing

Controlled Generative UI

Generative UI: useComponent

Agent renders typed React components via the useComponent hook

Human In the Loop: In-chat

Interactive approval/decision surface rendered inline in the chat. Uses the high-level `useHumanInTheLoop` hook — handles the interrupt lifecycle for you.

Human in the Loop: Interrupts

Interactive component rendered inline in the chat via the lower-level `useInterrupt` primitive — direct control over the LangGraph interrupt lifecycle.

In-Chat HITL (Booking)

Time-picker card rendered inline via useHumanInTheLoop for a booking flow

In-Chat Human in the Loop (Original)

Original HITL demo kept for backwards compatibility

Human in the Loop: Headless Interrupts

Resolve langgraph interrupts headlessly via agent.subscribe + copilotkit.runAgent — no chat, no useInterrupt render prop

Declarative Generative UI

Declarative UI: Dynamic A2UI

Canonical A2UI BYOC — custom catalog wired via a2ui.catalog

Declarative UI: Fixed A2UI

A2UI rendering against a known, fixed client-side schema

A2UI Error Recovery

Visible A2UI validate-retry recovery loop: an invalid render heals to a valid one, an always-invalid render shows a graceful recovery-exhausted fallback

Open-Ended Generative UI

MCP Apps

MCP server integration with UI display

Open Generative UI: Default

Agent-generated UI from arbitrary component libraries

Open Generative UI: Custom

Agent-authored UI that can invoke frontend sandbox functions from inside the iframe

Operational Generative UI

Generative UI: Tool Rendering (Default)

Out-of-the-box rendering: backend tools surfaced via CopilotKit's built-in default catch-all renderer; no frontend customization

Generative UI: Tool Rendering (Custom default)

Single branded wildcard renderer that paints every tool call — one card handles them all

Generative UI: Tool Rendering (Specific)

Custom per-tool renderers for the tools you care about, plus a wildcard catch-all for the rest

Generative UI: Rendering multiple tools

Sequential tool calls with reasoning tokens rendered side-by-side

LangGraph (FastAPI)

Reasoning

Visible reasoning/thinking chain alongside the final answer

LangGraph (FastAPI)

Reasoning (Default Render)

Built-in CopilotChatReasoningMessage renders without a custom slot

LangGraph (FastAPI)

Reasoning: Default

Built-in CopilotChatReasoningMessage rendering with no slot override

PydanticAI

Reasoning: Custom

Custom reasoning slot override via messageView.reasoningMessage

PydanticAI

Generative UI: Agent State

Agent-state-driven inline UI: the agent emits a live `steps` plan via copilotkit_emit_state and the frontend renders it with useCoAgentStateRender (v1 hook)

Interactivity

Frontend Tools: In-app Actions

Frontend tool execution triggered by the agent

Frontend Tools: Async

useFrontendTool with an async handler — agent awaits a client-side async operation (e.g. DB query) and uses the returned result

ThreadID: Frontend Tool Round-Trip

Regression demo for ENT-658 — verifies that an explicit threadId survives a useFrontendTool round-trip (agent invokes a frontend tool, awaits the async handler, and the same threadId is preserved across the resume).

Human in the Loop: In-app

Agent calls useFrontendTool with an async handler; the approval UI pops up as an app-level modal OUTSIDE the chat, and a completion callback resolves the pending tool Promise with the user's decision

Agent State

Shared State: Read + Write

Bidirectional agent state — UI writes preferences, agent writes notes back

Shared State: Read-only

Frontend recipe form publishes shared state via agent.setState; agent reads but does not mutate the recipe (neutral default agent, no backend tool)

Shared State: Streaming

Per-token state delta streaming from agent to UI

Shared State: Frontend Context

Frontend provides read-only context to the agent via useAgentContext

Observational Memory

Conversation context is compressed and activated out of band; the background work surfaces inline as activity cards

Multi-Agent

Background Agents

A long-running deep-research tool dispatched as a background task, surfaced inline as a live "working" activity card

BYOC (Bring Your Own Components)

Declarative UI: Hashbrown

Hashbrown-style generative UI (legacy slug — superseded by `declarative-hashbrown`; kept so the other 17 integrations whose manifests still declare this ID don't drop out of the catalog before their cross-codebase rename lands)

Declarative UI: json-render