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QA: Shared State (Read + Write) — LangGraph (Python)

Prerequisites

  • Demo is deployed and accessible at /demos/shared-state-read-write on the dashboard host
  • Agent backend is healthy (/api/health); OPENAI_API_KEY is set on Railway; LANGGRAPH_DEPLOYMENT_URL points at a LangGraph deployment exposing the shared-state-read-write graph

Test Steps

1. Basic Functionality

  • Navigate to /demos/shared-state-read-write; verify the page renders within 3s with the preferences + notes cards in the main column and the CopilotSidebar open by default on the right (cards stack vertically once the viewport drops below xl / 1280px)
  • Verify data-testid="preferences-card" is visible with heading "Your preferences"
  • Verify data-testid="notes-card" is visible with heading "Agent notes" and empty-state data-testid="notes-empty" reading "No notes yet. Ask the agent to remember something."
  • Verify the chat input placeholder is "Chat with the agent..."
  • Verify all 3 suggestion pills are visible with verbatim titles: "Greet me", "Remember something", "Plan a weekend"
  • Send "Hello" and verify an assistant text response appears within 10s

2. Feature-Specific Checks

UI Writes -> Agent Reads (preferences via agent.setState)

  • Type "Atai" into data-testid="pref-name"; verify data-testid="pref-state-json" updates to include "name": "Atai"
  • Change data-testid="pref-tone" to formal; verify the JSON preview reflects "tone": "formal"
  • Change data-testid="pref-language" to Spanish; verify the JSON preview reflects "language": "Spanish"
  • Click the Cooking and Travel interest pills; verify both show the selected style (border #BEC2FF, bg #BEC2FF1A) and the JSON preview's interests array contains both entries
  • Send "What do you know about me?"; verify within 10s the assistant reply references the name "Atai", a formal tone, Spanish, and the Cooking/Travel interests (the PreferencesInjectorMiddleware injects these into the system prompt each turn)
  • Click the "Plan a weekend" suggestion; verify the reply is tailored to the selected interests

Agent Writes -> UI Reads (notes via set_notes tool)

  • Click the "Remember something" suggestion (sends "Remember that I prefer morning meetings and that I don't eat dairy.")
  • Within 15s verify data-testid="notes-list" appears in the notes card and contains at least 2 data-testid="note-item" entries mentioning "morning meetings" and "dairy"
  • Verify data-testid="notes-empty" is no longer rendered
  • Send "Also remember I live in Berlin."; verify within 15s the notes list grows (previous notes preserved, new note added) — confirms the agent passes the FULL updated list per set_notes contract

UI Writes Back to Agent-Authored Slice (clear notes)

  • With notes present, verify data-testid="notes-clear-button" is visible
  • Click the Clear button; verify the notes list disappears and data-testid="notes-empty" re-renders
  • Ask "What do you remember about me?"; verify the agent no longer cites the cleared notes (state was written back by the UI via agent.setState({ notes: [] }))

Multi-Turn State Persistence

  • Change tone to playful and add the Music interest; send "Write me a one-line haiku greeting."; verify the reply is playful and references music
  • Send a follow-up "Do it again in French."; verify the reply remains playful, switches to French, and still acknowledges the music interest — confirms preferences persist across turns without being re-sent
  • Reload the page; verify preferences reset to defaults (tone: casual, language: English, empty interests, empty name) and notes reset to empty (state is per-session, seeded by the page's useEffect)

3. Error Handling

  • Attempt to send an empty message; verify it is a no-op (no user bubble, no assistant response)
  • Deselect all interests and clear the name; send "Who am I?"; verify the agent answers without crashing (middleware skips injection when preferences is empty)
  • Verify DevTools -> Console shows no uncaught errors during any flow above

Expected Results

  • Page loads within 3 seconds; assistant text response within 10 seconds
  • Preferences writes are reflected in pref-state-json synchronously on change
  • Agent-authored notes appear in notes-card within 15 seconds of a "remember" prompt, and the full prior list is preserved on subsequent set_notes calls
  • Clear button round-trips UI -> agent state and the agent loses access to the cleared notes on the next turn
  • No UI layout breaks, no uncaught console errors