wehub-resource-sync
537 lines
19 KiB
YAML
537 lines
19 KiB
YAML
name: LangGraph (FastAPI)
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slug: langgraph-fastapi
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category: emerging
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language: python
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logo: /logos/langgraph-fastapi.svg
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description: CopilotKit integration with LangGraph (FastAPI)
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partner_docs: null
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repo: https://github.com/CopilotKit/CopilotKit/tree/main/showcase/integrations/langgraph-fastapi
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copilotkit_version: 2.0.0
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deployed: true
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docs_mode: generated
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sort_order: 12
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generative_ui:
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- constrained-explicit
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- a2ui-fixed-schema
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- a2ui-dynamic-schema
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interaction_modalities:
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- sidebar
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- embedded
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- chat
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managed_platform:
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name: LangGraph Platform
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url: https://langsmith.com
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not_supported_features:
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- shared-state-streaming
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# QUARANTINED pending a @copilotkit/react-core release. gen-ui-interrupt /
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# interrupt-headless fail turn-2 on a useInterrupt/useHeadlessInterrupt
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# RESUME-PATH hook bug in @copilotkit/react-core/v2: backend resumes + streams
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# (HTTP 200) but the frontend never appends the confirmation assistant bubble,
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# so the harness DOM settle-check times out. Fix is a published-package change
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# (out of scope here); honestly marked not-supported (skipped-incapable, not
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# green, not red) rather than a regression. Demos remain wired below.
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- gen-ui-interrupt
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- interrupt-headless
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features:
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- cli-start
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- agentic-chat
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- tool-rendering
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- tool-rendering-default-catchall
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- tool-rendering-custom-catchall
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- tool-rendering-reasoning-chain
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- agentic-chat-reasoning
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- reasoning-default-render
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- hitl
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- gen-ui-agent
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- declarative-gen-ui
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- a2ui-fixed-schema
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- a2ui-recovery
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- mcp-apps
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- gen-ui-tool-based
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- shared-state-read-write
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- subagents
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- beautiful-chat
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- prebuilt-sidebar
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- prebuilt-popup
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- chat-slots
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- chat-customization-css
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- headless-simple
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- headless-complete
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- auth
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- multimodal
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- agent-config
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- frontend-tools
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- frontend-tools-async
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- hitl-in-app
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- hitl-in-chat
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- hitl-in-chat-booking
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- readonly-state-agent-context
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- voice
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- byoc-hashbrown
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- byoc-json-render
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- open-gen-ui
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- open-gen-ui-advanced
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a2ui_pattern: schema-loading
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interrupt_pattern: native
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thread_persistence_pattern: langgraph
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agent_config_pattern: shared-state
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auth_pattern: langgraph
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demos:
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- id: cli-start
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name: CLI Start Command
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description: Copy-paste command to clone the canonical starter
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tags:
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- chat-ui
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command: "npx copilotkit@latest init --framework langgraph-fastapi"
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- id: agentic-chat
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name: Agentic Chat
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description: Natural conversation with frontend tool execution
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tags:
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- chat-ui
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route: /demos/agentic-chat
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animated_preview_url:
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- id: tool-rendering
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name: Tool Rendering
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description: Backend agent tools rendered as UI components
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tags:
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- agent-capabilities
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route: /demos/tool-rendering
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animated_preview_url:
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highlight:
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- src/agents/src/tool_rendering_agent.py
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- src/app/demos/tool-rendering/page.tsx
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- id: hitl
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name: In-Chat Human in the Loop (Original)
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description: User approves agent actions before execution
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tags:
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- interactivity
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route: /demos/hitl
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animated_preview_url:
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- id: gen-ui-agent
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name: Agentic Generative UI
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description: Long-running agent tasks with generated UI
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tags:
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- generative-ui
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route: /demos/gen-ui-agent
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animated_preview_url:
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- id: gen-ui-tool-based
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name: Tool-Based Generative UI
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description: Agent uses tools to trigger UI generation
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tags:
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- generative-ui
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route: /demos/gen-ui-tool-based
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animated_preview_url:
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highlight:
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- src/app/demos/gen-ui-tool-based/page.tsx
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- src/app/api/copilotkit/route.ts
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- src/app/demos/gen-ui-tool-based/bar-chart.tsx
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- id: shared-state-streaming
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name: State Streaming
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description: Per-token state delta streaming from agent to UI
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tags:
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- agent-state
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route: /demos/shared-state-streaming
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animated_preview_url:
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- id: shared-state-read-write
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name: Shared State (Read + Write)
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description: Bidirectional shared state — UI writes preferences, agent writes notes
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tags:
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- agent-state
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route: /demos/shared-state-read-write
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animated_preview_url:
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highlight:
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- src/agents/src/shared_state_read_write.py
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- src/app/demos/shared-state-read-write/page.tsx
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- src/app/demos/shared-state-read-write/preferences-card.tsx
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- src/app/demos/shared-state-read-write/notes-card.tsx
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- src/app/api/copilotkit/route.ts
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- id: subagents
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name: Sub-Agents
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description: Multiple agents with visible task delegation
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tags:
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- multi-agent
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route: /demos/subagents
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animated_preview_url:
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highlight:
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- src/agents/src/subagents.py
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- src/app/demos/subagents/page.tsx
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- src/app/demos/subagents/delegation-log.tsx
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- src/app/api/copilotkit/route.ts
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- id: prebuilt-sidebar
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name: "Pre-Built: Sidebar"
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description: Docked sidebar chat via <CopilotSidebar />
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tags:
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- chat-ui
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route: /demos/prebuilt-sidebar
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animated_preview_url:
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highlight:
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- src/agents/src/agent.py
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- src/app/demos/prebuilt-sidebar/page.tsx
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- src/app/api/copilotkit/route.ts
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- id: prebuilt-popup
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name: "Pre-Built: Popup"
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description: Floating popup chat via <CopilotPopup />
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tags:
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- chat-ui
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route: /demos/prebuilt-popup
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animated_preview_url:
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highlight:
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- src/agents/src/agent.py
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- src/app/demos/prebuilt-popup/page.tsx
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- src/app/api/copilotkit/route.ts
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- id: chat-slots
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name: Chat Customization (Slots)
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description: Customize CopilotChat via its slot system
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tags:
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- chat-ui
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route: /demos/chat-slots
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animated_preview_url:
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highlight:
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- src/agents/src/agent.py
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- src/app/demos/chat-slots/page.tsx
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- src/app/api/copilotkit/route.ts
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- src/app/demos/chat-slots/slot-wrappers.tsx
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- id: chat-customization-css
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name: Chat Customization (CSS)
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description: Default CopilotChat re-themed via CopilotKitCSSProperties
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tags:
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- chat-ui
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route: /demos/chat-customization-css
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animated_preview_url:
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highlight:
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- src/agents/src/agent.py
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- src/app/demos/chat-customization-css/page.tsx
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- src/app/demos/chat-customization-css/theme.css
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- src/app/api/copilotkit/route.ts
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- id: beautiful-chat
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name: Beautiful Chat
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description: Canonical polished starter chat — brand fonts, theme tokens,
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suggestion pills
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tags:
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- chat-ui
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route: /demos/beautiful-chat
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animated_preview_url:
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highlight:
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- src/agents/src/beautiful_chat.py
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- src/app/demos/beautiful-chat/page.tsx
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- src/app/demos/beautiful-chat/components/example-layout/index.tsx
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- src/app/demos/beautiful-chat/components/example-canvas/index.tsx
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- src/app/demos/beautiful-chat/components/generative-ui/charts/bar-chart.tsx
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- src/app/demos/beautiful-chat/components/generative-ui/charts/pie-chart.tsx
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- src/app/demos/beautiful-chat/hooks/use-example-suggestions.tsx
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- src/app/demos/beautiful-chat/hooks/use-generative-ui-examples.tsx
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- src/app/api/copilotkit-beautiful-chat/route.ts
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- id: headless-simple
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name: Headless Chat (Simple)
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description: Minimal custom chat surface built on useAgent
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tags:
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- chat-ui
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route: /demos/headless-simple
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animated_preview_url:
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highlight:
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- src/agents/src/agent.py
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- src/app/demos/headless-simple/page.tsx
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- src/app/api/copilotkit/route.ts
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- id: headless-complete
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name: Headless Chat (Complete)
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description: Full chat implementation built from scratch on useAgent
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tags:
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- chat-ui
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route: /demos/headless-complete
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animated_preview_url:
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highlight:
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- src/agents/src/headless_complete.py
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- src/app/demos/headless-complete/page.tsx
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- src/app/api/copilotkit/route.ts
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- src/app/demos/headless-complete/chat/chat.tsx
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- src/app/demos/headless-complete/hooks/use-tool-renderers.tsx
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- src/app/demos/headless-complete/hooks/use-frontend-components.ts
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- src/app/demos/headless-complete/hooks/use-headless-suggestions.ts
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- src/app/demos/headless-complete/attachments/use-attachments-config.ts
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- src/app/demos/headless-complete/tools/weather-card.tsx
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- src/app/demos/headless-complete/tools/stock-card.tsx
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- src/app/demos/headless-complete/tools/chart-card.tsx
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- src/app/demos/headless-complete/tools/highlight-note.tsx
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- id: auth
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name: Authentication
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description:
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Bearer-token gate via runtime onRequest hook with unauthenticated /
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authenticated states
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tags:
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- chat-ui
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route: /demos/auth
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animated_preview_url:
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highlight:
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- src/app/demos/auth/page.tsx
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- src/app/demos/auth/auth-banner.tsx
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- src/app/demos/auth/use-demo-auth.ts
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- src/app/demos/auth/demo-token.ts
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- src/app/api/copilotkit-auth/[[...slug]]/route.ts
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- id: multimodal
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name: Multimodal Attachments
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description:
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Image and PDF uploads via CopilotChat attachments, processed by a
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vision-capable agent
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tags:
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- chat-ui
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route: /demos/multimodal
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animated_preview_url:
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highlight:
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- src/agents/src/multimodal_agent.py
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- src/app/demos/multimodal/page.tsx
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- src/app/demos/multimodal/sample-attachment-buttons.tsx
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- src/app/api/copilotkit-multimodal/route.ts
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- id: agent-config
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name: Agent Config Object
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description:
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Forward a typed config object (tone / expertise / response length)
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from the provider to the agent's dynamic system prompt
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tags:
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- platform
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route: /demos/agent-config
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animated_preview_url:
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highlight:
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- src/agents/src/agent_config_agent.py
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- src/app/demos/agent-config/page.tsx
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- src/app/demos/agent-config/config-card.tsx
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- src/app/demos/agent-config/use-agent-config.ts
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- src/app/demos/agent-config/config-types.ts
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- src/app/api/copilotkit-agent-config/route.ts
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- id: tool-rendering-default-catchall
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name: Tool Rendering (Default Catch-all)
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description: Out-of-the-box tool rendering — backend defines the tools; the
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frontend adds zero custom renderers and relies on CopilotKit's built-in
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default UI
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tags:
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- generative-ui
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route: /demos/tool-rendering-default-catchall
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animated_preview_url:
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highlight:
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- src/app/demos/tool-rendering-default-catchall/page.tsx
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- src/agents/src/tool_rendering_agent.py
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- src/app/api/copilotkit/route.ts
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- id: tool-rendering-custom-catchall
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name: Tool Rendering (Custom Catch-all)
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description: Single branded wildcard renderer via useDefaultRenderTool — the
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same app-designed card paints every tool call
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tags:
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- generative-ui
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route: /demos/tool-rendering-custom-catchall
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animated_preview_url:
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highlight:
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- src/app/demos/tool-rendering-custom-catchall/page.tsx
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- src/app/demos/tool-rendering-custom-catchall/custom-catchall-renderer.tsx
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- src/agents/src/tool_rendering_agent.py
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- src/app/api/copilotkit/route.ts
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- id: tool-rendering-reasoning-chain
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name: Tool Rendering + Reasoning Chain (testing)
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description: Sequential tool calls with reasoning tokens rendered side-by-side
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tags:
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- generative-ui
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route: /demos/tool-rendering-reasoning-chain
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animated_preview_url:
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highlight:
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- src/agents/src/tool_rendering_reasoning_chain_agent.py
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- src/app/demos/tool-rendering-reasoning-chain/page.tsx
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- src/app/demos/tool-rendering-reasoning-chain/weather-card.tsx
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- src/app/demos/tool-rendering-reasoning-chain/flight-list-card.tsx
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- src/app/api/copilotkit/route.ts
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- id: gen-ui-interrupt
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name: In-Chat HITL (useInterrupt — low-level primitive)
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description: Interactive component rendered inline in the chat via the
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lower-level `useInterrupt` primitive — direct control over the LangGraph
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interrupt lifecycle
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tags:
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- generative-ui
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route: /demos/gen-ui-interrupt
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animated_preview_url:
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highlight:
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- src/agents/src/interrupt_agent.py
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- src/app/demos/gen-ui-interrupt/page.tsx
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- src/app/demos/gen-ui-interrupt/_components/time-picker-card.tsx
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- src/app/api/copilotkit/route.ts
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- id: interrupt-headless
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name: Headless Interrupt (testing)
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description:
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Resolve langgraph interrupts from a plain button grid — no chat, no
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useInterrupt render prop
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tags:
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- interactivity
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route: /demos/interrupt-headless
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animated_preview_url:
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highlight:
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- src/agents/src/interrupt_agent.py
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- src/app/demos/interrupt-headless/page.tsx
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- src/app/api/copilotkit/route.ts
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- id: declarative-gen-ui
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name: Declarative Generative UI (A2UI)
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description: Canonical A2UI BYOC — custom catalog
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(Card/StatusBadge/Metric/InfoRow/PrimaryButton) wired via a2ui.catalog on
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the provider
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tags:
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- generative-ui
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route: /demos/declarative-gen-ui
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animated_preview_url:
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highlight:
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- src/agents/src/a2ui_dynamic.py
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- src/app/demos/declarative-gen-ui/page.tsx
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- src/app/demos/declarative-gen-ui/a2ui/catalog.ts
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- src/app/demos/declarative-gen-ui/a2ui/definitions.ts
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- src/app/demos/declarative-gen-ui/a2ui/renderers.tsx
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- src/app/api/copilotkit-declarative-gen-ui/route.ts
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- id: a2ui-fixed-schema
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name: Declarative Generative UI (A2UI — Fixed Schema)
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description: A2UI rendering against a known client-side schema
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tags:
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- generative-ui
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route: /demos/a2ui-fixed-schema
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animated_preview_url:
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highlight:
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- src/agents/src/a2ui_fixed.py
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- src/agents/src/a2ui_schemas/flight_schema.json
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- src/agents/src/a2ui_schemas/booked_schema.json
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- src/app/demos/a2ui-fixed-schema/page.tsx
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- src/app/demos/a2ui-fixed-schema/a2ui/catalog.ts
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- src/app/demos/a2ui-fixed-schema/a2ui/definitions.ts
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- src/app/demos/a2ui-fixed-schema/a2ui/renderers.tsx
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- src/app/api/copilotkit-a2ui-fixed-schema/route.ts
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- id: a2ui-recovery
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name: A2UI Error Recovery
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description: Makes the A2UI validate->retry recovery loop visible — an invalid first render heals to a valid one, and an always-invalid render shows a graceful recovery-exhausted fallback. Backend-owned via get_a2ui_tools (injectA2UITool=false); reuses the declarative-gen-ui catalog.
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tags:
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- generative-ui
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route: /demos/a2ui-recovery
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animated_preview_url:
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highlight:
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- src/agents/src/recovery_agent.py
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- src/app/demos/a2ui-recovery/page.tsx
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- src/app/demos/a2ui-recovery/suggestions.ts
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- src/app/api/copilotkit-a2ui-recovery/route.ts
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- id: mcp-apps
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name: MCP Apps
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description: MCP server-driven UI via activity renderers
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tags:
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- generative-ui
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route: /demos/mcp-apps
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animated_preview_url:
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highlight:
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- src/agents/src/mcp_apps_agent.py
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- src/app/demos/mcp-apps/page.tsx
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- src/app/api/copilotkit-mcp-apps/route.ts
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- id: frontend-tools
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name: Frontend Tools (In-App Actions)
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description: Agent invokes client-side handlers registered with useFrontendTool
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tags:
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- interactivity
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route: /demos/frontend-tools
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animated_preview_url:
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highlight:
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- src/agents/src/frontend_tools.py
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- src/app/demos/frontend-tools/page.tsx
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- src/app/api/copilotkit/route.ts
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- id: frontend-tools-async
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name: Frontend Tools (Async)
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description:
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useFrontendTool with an async handler — agent awaits a client-side
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async operation (simulated notes DB query) and uses the returned result
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tags:
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- interactivity
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route: /demos/frontend-tools-async
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animated_preview_url:
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highlight:
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- src/agents/src/frontend_tools_async.py
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- src/app/demos/frontend-tools-async/page.tsx
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- src/app/demos/frontend-tools-async/notes-card.tsx
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- src/app/api/copilotkit/route.ts
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- id: hitl-in-app
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name: In-App Human in the Loop (Frontend Tools + async HITL)
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description:
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Agent requests approval via useFrontendTool with an async handler;
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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
|
|
tags:
|
|
- interactivity
|
|
route: /demos/hitl-in-app
|
|
animated_preview_url:
|
|
highlight:
|
|
- src/agents/src/hitl_in_app.py
|
|
- src/app/demos/hitl-in-app/page.tsx
|
|
- src/app/demos/hitl-in-app/approval-dialog.tsx
|
|
- src/app/api/copilotkit/route.ts
|
|
- id: hitl-in-chat
|
|
name: In-Chat HITL (useHumanInTheLoop — ergonomic API)
|
|
description:
|
|
Interactive approval/decision surface rendered inline in the chat
|
|
via the high-level `useHumanInTheLoop` hook
|
|
tags:
|
|
- interactivity
|
|
route: /demos/hitl-in-chat
|
|
animated_preview_url:
|
|
highlight:
|
|
- src/agents/src/hitl_in_chat_agent.py
|
|
- src/app/demos/hitl-in-chat/page.tsx
|
|
- src/app/demos/hitl-in-chat/time-picker-card.tsx
|
|
- src/app/api/copilotkit/route.ts
|
|
- id: hitl-in-chat-booking
|
|
name: In-Chat HITL (Booking)
|
|
description: Time-picker card rendered inline via useHumanInTheLoop for a booking flow
|
|
tags:
|
|
- interactivity
|
|
route: /demos/hitl-in-chat
|
|
animated_preview_url:
|
|
highlight:
|
|
- src/agents/src/hitl_in_chat_agent.py
|
|
- src/app/demos/hitl-in-chat/page.tsx
|
|
- src/app/demos/hitl-in-chat/time-picker-card.tsx
|
|
- src/app/api/copilotkit/route.ts
|
|
- id: readonly-state-agent-context
|
|
name: Readonly State (Agent Context)
|
|
description: Frontend provides read-only context to the agent via useAgentContext
|
|
tags:
|
|
- agent-state
|
|
route: /demos/readonly-state-agent-context
|
|
animated_preview_url:
|
|
highlight:
|
|
- src/agents/src/readonly_state_agent_context.py
|
|
- src/app/demos/readonly-state-agent-context/page.tsx
|
|
- src/app/api/copilotkit/route.ts
|
|
- id: voice
|
|
name: Voice Input
|
|
description: Speech-to-text via @copilotkit/voice with a bundled sample audio button
|
|
tags:
|
|
- chat-ui
|
|
route: /demos/voice
|
|
animated_preview_url:
|
|
highlight:
|
|
- src/agents/src/agent.py
|
|
- src/app/demos/voice/page.tsx
|
|
- src/app/demos/voice/sample-audio-button.tsx
|
|
- src/app/api/copilotkit-voice/[[...slug]]/route.ts
|
|
- id: open-gen-ui
|
|
name: Fully Open-Ended Generative UI
|
|
description: Agent generates UI from an arbitrary component library
|
|
tags:
|
|
- generative-ui
|
|
route: /demos/open-gen-ui
|
|
animated_preview_url:
|
|
highlight:
|
|
- src/agents/src/open_gen_ui_agent.py
|
|
- src/app/demos/open-gen-ui/page.tsx
|
|
- src/app/api/copilotkit-ogui/route.ts
|
|
- id: open-gen-ui-advanced
|
|
name: "Open-Ended Gen UI (Advanced: with frontend function calling)"
|
|
description:
|
|
Agent-authored UI that can invoke frontend sandbox functions from
|
|
inside the iframe
|
|
tags:
|
|
- generative-ui
|
|
route: /demos/open-gen-ui-advanced
|
|
animated_preview_url:
|
|
highlight:
|
|
- src/agents/src/open_gen_ui_advanced_agent.py
|
|
- src/app/demos/open-gen-ui-advanced/page.tsx
|
|
- src/app/demos/open-gen-ui-advanced/sandbox-functions.ts
|
|
- src/app/demos/open-gen-ui-advanced/suggestions.ts
|
|
- src/app/api/copilotkit-ogui/route.ts
|