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copilotkit__copilotkit/showcase/integrations/claude-sdk-python/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 — Claude Agent SDK (Python)

Prerequisites

  • Demo is deployed and accessible at /demos/subagents on the dashboard host
  • Agent backend is healthy (/api/health); ANTHROPIC_API_KEY is set on Railway; the FastAPI backend exposes POST /subagents

Test Steps

1. Basic Functionality

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

2. Feature-Specific Checks

Multi-stage Delegation Flow

  • Click the "Write a blog post" suggestion (cold-exposure training prompt)
  • Within 5s verify data-testid="supervisor-running" appears with the "Supervisor running" pulse indicator
  • Within 30s verify at least one data-testid="delegation-entry" appears with badge "Research" and data-testid="delegation-status" initially reading running
  • Verify the entry's status flips to completed once the sub-agent returns and the result text is visible inside the entry's white inner panel
  • Within 60s total verify additional delegation entries appear in order: Research -> Writing -> Critique (3 entries total in most cases)
  • Verify data-testid="delegation-count" updates to match the number of entries (e.g. "3 calls")
  • Verify the supervisor's final chat reply includes a brief summary of the produced deliverable

Delegation Entry Layout

  • Each data-testid="delegation-entry" shows: a #N index, a sub-agent badge with the correct emoji (🔎 Research / ✍️ Writing / 🧐 Critique), a status chip, the task text after "Task:", and the sub-agent's result rendered with whitespace preserved
  • Hover the supervisor running chip while a delegation is in flight — verify the pulse animation is present (no static-only state)

Sub-Agent Independence

  • Click "Explain a topic" (LLM tool calling prompt) and wait for completion
  • Verify the writing entry's result is a single polished paragraph (the writing sub-agent's signature)
  • Verify the research entry's result is a bulleted list of 3-5 facts (the research sub-agent's signature)
  • Verify the critique entry's result contains 2-3 actionable critiques

Supervisor State Reset Across Tasks

  • After the first run completes, click "Summarize a topic" (reusable rockets)
  • Verify NEW delegation entries are appended to the existing list (count keeps growing) — confirms state["delegations"] accumulates across turns within the same thread

3. Error Handling

  • Send an empty message; verify it is a no-op
  • If a sub-agent call fails (e.g. due to upstream rate limit), verify the failing entry is rendered with status failed and a result line starting with "sub-agent call failed:" — confirms the fail-loud path
  • Verify DevTools -> Console shows no uncaught errors during any flow above

Expected Results

  • Page loads within 3 seconds
  • First delegation entry appears within 30 seconds of submitting a non-trivial task
  • Each delegation entry transitions from running -> completed (or failed) and the count badge stays in sync with state["delegations"].length
  • Supervisor's final chat reply summarises the work and arrives within 90 seconds of submission
  • No UI layout breaks, no uncaught console errors
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