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copilotkit__copilotkit/showcase/integrations/ag2/qa/subagents.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: Sub-Agents — AG2

Prerequisites

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

Test Steps

1. Page renders with delegation log + chat

  • Navigate to /demos/subagents
  • Left pane shows the Delegation log panel (data-testid="delegation-log")
  • Header reads "Sub-agent delegations" with a counter data-testid="delegation-count" showing 0 calls
  • Empty-state copy: "Ask the supervisor to complete a task. Every sub-agent it calls will appear here."
  • Right pane shows the chat with placeholder "Give the supervisor a task..."

2. Single delegation chain

  • Click suggestion "Write a blog post" (or send the equivalent message).
  • While the supervisor runs, the badge data-testid="supervisor-running" ("Supervisor running") appears in the header.
  • As the supervisor delegates, entries appear in the log (data-testid="delegation-entry"). Expect at least 3 entries — one Research, one Writing, one Critique — in that order.
  • Each entry shows:
    • A #N index, a colored badge with the sub-agent name + emoji.
    • A Task: ... line summarizing what was delegated.
    • A result block containing the sub-agent's output (real LLM text, not placeholders).
  • Counter updates to 3 calls (or more if the supervisor iterated).

3. Independent delegations

  • Reload the page (state resets).
  • Send: "Research what causes the northern lights."
  • At least 1 Research delegation appears with a bulleted list of facts in the result.
  • Send: "Now write a paragraph aimed at a 10-year-old, using those facts."
  • A Writing delegation appears with a polished paragraph in the result.
  • Send: "Critique that paragraph."
  • A Critique delegation appears with 2-3 actionable critiques.

4. Supervisor reply hygiene

  • After each chain, the supervisor's chat reply is short — it summarizes rather than re-pasting the full sub-agent output (which already lives in the delegation log).
  • The "Supervisor running" badge disappears once the run is complete.

5. Error handling

  • Send a very short message (e.g. "Hi"). The supervisor responds gracefully (it may not delegate for a trivial greeting).
  • No console errors during normal usage.

Expected Results

  • Page loads in < 3 seconds.
  • Each user request that's non-trivial produces at least one delegation entry.
  • The delegation log grows live during the run, not just at the end.
  • Sub-agent results are real LLM outputs (not stubbed strings).
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