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copilotkit__copilotkit/showcase/integrations/strands/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 — AWS Strands

Prerequisites

  • Demo is deployed and accessible at /demos/subagents on the dashboard host
  • Agent backend is healthy (/api/health); OPENAI_API_KEY is set; the Strands agent server (agent_server.py) is reachable at AGENT_URL

Test Steps

1. Basic Functionality

  • Navigate to /demos/subagents; verify the page renders within 3s with a wide delegation log on the left and a CopilotChat pane on the right
  • Verify data-testid="delegation-log" is visible with heading "Sub-agent delegations"
  • Verify the empty state reads "Ask the supervisor to complete a task. Every sub-agent it calls will appear here."
  • Verify data-testid="delegation-count" reads "0 calls"
  • Verify the chat input placeholder is "Give the supervisor a task..."
  • Verify all 3 suggestion pills are visible: "Write a blog post", "Explain a topic", "Summarize a topic"

2. Feature-Specific Checks

Supervisor delegates to sub-agents (research → write → critique)

  • Click the "Write a blog post" suggestion (sends a research/write/critique sequence prompt)
  • Within 5s verify data-testid="supervisor-running" appears next to the heading with the pulsing indicator
  • Within 60s verify data-testid="delegation-count" reads at least "3 calls" and at least 3 data-testid="delegation-entry" rows are rendered
  • Verify the first entry has the 🔎 Research badge, a non-empty Task: line, and a result body containing 3-5 bullet points
  • Verify a subsequent entry has the ✍️ Writing badge with a polished paragraph in the result body
  • Verify a subsequent entry has the 🧐 Critique badge with 2-3 actionable critiques
  • Verify each entry shows status completed (green) once the sub-agent has returned
  • Once the supervisor returns a final assistant text message, verify supervisor-running disappears

Live updates during the run

  • Click the "Explain a topic" suggestion
  • Verify entries appear ONE-AT-A-TIME (the count climbs from 0 → 1 → 2 → 3 over multiple seconds rather than all appearing at once) — this confirms each sub-agent's state_from_result hook emits an independent StateSnapshotEvent
  • Verify entry numbers (#1, #2, #3) are sequential and stable

Multi-turn persistence

  • After the first run completes, send "Now do the same for solar panels." — verify the delegation log GROWS (existing rows kept; new rows appended); the count should continue from where it left off (e.g. "3 calls" → "6 calls")

3. Error Handling

  • Send an empty message — verify it is a no-op
  • Send "Hello" (no task to delegate); verify the supervisor responds with a short text reply and NO new delegation entries are added
  • Verify DevTools -> Console shows no uncaught errors during any flow above

Expected Results

  • Page loads within 3 seconds
  • First delegation entry appears within 15s of submitting a task; full research → write → critique loop completes within 60s
  • Each sub-agent invocation produces exactly one delegation entry with a non-empty task and result
  • Supervisor's final summary references the work that was delegated
  • No UI layout breaks, no uncaught console errors
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