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).