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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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Markdown

# QA: Sub-Agents — LangGraph (FastAPI)
## Prerequisites
- Demo is deployed and accessible
- Agent backend is healthy (check `/api/copilotkit` GET — `agent_status: "reachable"`)
- `OPENAI_API_KEY` is set in the agent environment
## What this demo proves
- A supervisor LLM exposes three sub-agents (`research_agent`,
`writing_agent`, `critique_agent`) as tools.
- Each sub-agent is a real `create_agent(...)` with its own system
prompt — the supervisor does NOT just template-fill responses.
- Every delegation appends an entry to the `delegations` slot of agent
state, which the UI renders live as a delegation log.
## Test Steps
### 1. Page loads with delegation log + chat
- [ ] Navigate to `/demos/subagents`
- [ ] The delegation log (`data-testid="delegation-log"`) is visible on the left
- [ ] Header reads "Sub-agent delegations"
- [ ] Counter (`data-testid="delegation-count"`) reads "0 calls"
- [ ] Empty state copy: "Ask the supervisor to complete a task..."
- [ ] Chat is visible on the right with placeholder "Give the supervisor a task..."
### 2. Supervisor running indicator
- [ ] Send the "Write a blog post" suggestion
- [ ] Within ~2 seconds the `supervisor-running` badge appears on the log header
- [ ] The badge has the pulsing dot and "Supervisor running" label
### 3. Delegations appear live
- [ ] As the run progresses, `delegation-entry` rows appear one at a time
- [ ] Counter increments accordingly (1 calls, 2 calls, 3 calls)
- [ ] Typical sequence on the "Write a blog post" suggestion:
- [ ] First entry shows the Research badge (`🔎 Research`)
- [ ] Second entry shows the Writing badge (`✍️ Writing`)
- [ ] Third entry shows the Critique badge (`🧐 Critique`)
- [ ] Each entry shows the task on one line and the sub-agent's result
below it in the result panel
- [ ] Each entry status shows `completed`
### 4. Result quality (sanity check)
- [ ] The research entry's result is a bulleted list of 3-5 facts
- [ ] The writing entry's result is a single coherent paragraph
- [ ] The critique entry's result is 2-3 bullet/critique items
- [ ] When the supervisor finishes, the `supervisor-running` badge disappears
### 5. Multiple runs accumulate
- [ ] Send the "Explain a topic" suggestion next
- [ ] Counter continues from previous total (does not reset)
- [ ] New delegation entries are appended at the bottom
### 6. Error handling
- [ ] Sending an empty message is handled gracefully (no crash)
- [ ] No console errors during a normal run
## Expected Results
- Chat loads within 3 seconds
- First delegation appears within ~10 seconds of sending a task
- A typical 3-step plan completes in under 60 seconds
- No UI errors, broken layouts, or console warnings