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copilotkit__copilotkit/showcase/integrations/ag2/qa/shared-state-read-write.md
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Alem Tuzlak 23a3b24a01 feat(showcase/integrations): shared-state-read-write + subagents demos across 15 packages 
Adds real working Shared State (Read+Write) and Sub-Agents demos to 15
showcase integrations, mirroring the canonical langgraph-python and
google-adk reference implementations. Fills rows previously empty on
the showcase coverage dashboard.

Packages: ag2, agno, claude-sdk-python, claude-sdk-typescript,
crewai-crews, langgraph-fastapi, langgraph-typescript, langroid,
llamaindex, mastra, ms-agent-dotnet, ms-agent-python, pydantic-ai,
spring-ai, strands. (built-in-agent landed independently on main as
PR #4321 — its variant is canonical; this PR no longer touches it.)

Per-package deliverables: framework-native backend agents
(preferences-injection middleware/callback + set_notes tool;
supervisor + 3 sub-agents wired as tools with running -> completed
/failed delegation log); frontend page.tsx + preferences-card.tsx /
notes-card.tsx for SSRW and delegation-log.tsx for subagents — wired
to useAgent({ updates: [OnStateChanged] }); manifest entries; runtime
route registration + per-package agent server config; real QA
scripts.

Includes targeted hardening fixes from a 7-agent code-review loop:

- Sub-agent failure paths now correctly emit status: "failed"
  (previously hardcoded "completed" or unreachable in
  mastra/strands/langgraph-fastapi/langgraph-typescript/ag2)
- Parallel-tool-call delegation race fixed in langgraph-fastapi
  (Annotated[list, add]) and langgraph-typescript (concat reducer)
- Silent data loss eliminated in
  claude-sdk-python/claude-sdk-typescript/crewai-crews — empty
  JSON.parse catches now log + emit error events
- ms-agent-dotnet set_notes writes to per-thread slot via AsyncLocal
- mastra working-memory writes are deterministic via
  src/mastra/tools/working-memory.ts helper
- spring-ai tool-call envelope ids match supervisor's tc.id() and
  AG-UI event ordering reordered; CopyOnWriteArrayList for
  parallel-call safety
- Stack trace + raw error message leaks scrubbed across 8+ Next.js
  routes — log server-side with errorId + return generic envelope
- Sub-agent calls no longer block event loops in ag2
  (asyncio.to_thread), langroid (llm_response_async), pydantic-ai
  (async run + async tools)
- langroid lru_cache cross-request contamination dropped
- Numerous smaller items: claude-sdk-python invalid model id, Callable
  annotation, /health endpoint exposed; crewai-crews supervisor
  no longer resets delegations every turn; pydantic-ai snapshot uses
  model_dump()

CI fixes folded in:
- crewai-crews test_forwarded_props: extend the stubbed
  ag_ui_crewai.endpoint module to expose
  add_crewai_flow_fastapi_endpoint and add stub
  agents.shared_state_read_write / agents.subagents modules
- generate-catalog test: bump crewai-crews wired-cell expectation
  28 -> 30; replace hardcoded total-wired count with an invariant
  (wired + stub + unshipped = 737) plus a lower-bound floor
- oxfmt run on the qa/shared-state-read-write.md files in mastra +
  spring-ai

Rebased onto latest main (post showcase/packages -> showcase/integrations
rename + post built-in-agent landing). Original blitz history
preserved at the blitz-pre-rebase-snapshot tag.

Known follow-ups (deferred to follow-up PR):
- agno sync sub_agent.run() blocks event loop (perf only)
- ms-agent-python asyncio thread-fallback fragility
- llamaindex initial-state coercion when UI clears state
- Manifest highlight audit (langgraph-typescript headless-complete,
  langgraph-fastapi byoc-* missing route.ts highlights)
- agno hitl-in-chat declared in demos but not features; duplicate
  /demos/hitl-in-chat route
- langgraph-typescript server.mjs graphSpec only registers 3 graphs
  vs 23 in langgraph.json (pre-existing)
- mastra hitl legacy demo missing from features list
- claude-sdk-python agents/agent.py line 474 also has the legacy
  claude-opus-4-5 default
- PARITY_NOTES vs manifest mismatches for hitl-in-app across
  spring-ai/agno/ag2 (pre-existing)
- spring-ai a2ui-fixed-schema missing from generative_ui list
2026-04-28 18:36:13 +02:00

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QA: Shared State (Read + Write) — AG2

Prerequisites

  • Demo is deployed and accessible at /demos/shared-state-read-write
  • Agent backend is healthy (check /api/copilotkit GET → agent_status: reachable)
  • Backend has OPENAI_API_KEY set
  • The shared-state-read-write agent is mounted at /shared-state-read-write on the FastAPI server (see src/agent_server.py)

Test Steps

1. Page renders with the two cards and chat

  • Navigate to /demos/shared-state-read-write
  • Sidebar shows the Preferences card (data-testid="preferences-card")
  • Sidebar shows the Agent notes card (data-testid="notes-card") with the empty state copy "No notes yet. Ask the agent to remember something."
  • Right-hand pane shows <CopilotChat /> with the placeholder "Chat with the agent..."
  • The "Shared state" panel inside the preferences card shows JSON with name: "", tone: "casual", language: "English", interests: []

2. UI -> agent (write)

  • Type a name (e.g. Atai) into the Name input. The "Shared state" JSON inside the card updates immediately to reflect the new name.
  • Change Tone to playful. JSON updates.
  • Change Language to Spanish. JSON updates.
  • Toggle 2-3 interests (e.g. Cooking, Tech). JSON updates and the buttons show the selected style.
  • In the chat, send: "Greet me in one sentence."
  • The agent's reply addresses the user by name in a playful tone, in Spanish (i.e. it actually used the preferences). It must NOT just echo the JSON.

3. agent -> UI (read)

  • In the chat, send: "Remember that I prefer morning meetings and that I don't eat dairy."
  • The Agent notes card transitions from the empty state to a bulleted list with at least 2 entries (data-testid="note-item"), reflecting the two facts above. The list updates in real time while/after the agent finishes its turn.
  • In the chat, send: "Also remember I work in Pacific time."
  • The notes list now has at least 3 entries (the agent passed the FULL list to set_notes, not just the new one).

4. Round-trip + Clear

  • Click the Clear button on the notes card.
  • The notes card returns to the empty state immediately.
  • In the chat, send: "What do you remember about me?"
  • The agent reports it has no remembered notes (because the UI cleared them via agent.setState), confirming the UI's write-back was visible to the agent on its next turn.

5. Error handling

  • Send an empty message → handled gracefully (no crash, no broken UI).
  • No console errors during normal usage.

Expected Results

  • Page loads in < 3 seconds.
  • Preferences edits propagate to agent state instantly.
  • Agent replies adapt visibly to preferences (name, tone, language).
  • Notes card reflects every set_notes call from the agent.
  • Clearing notes from the UI is reflected on the agent's next turn.
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