QA: Sub-Agents — Google ADK

Prerequisites

• Demo is deployed and accessible at /demos/subagents on the dashboard host
• Agent backend is healthy (/api/health); GOOGLE_API_KEY is set (or GOOGLE_GEMINI_BASE_URL points at the aimock proxy)
• A supervisor LlmAgent delegates to three sub-agents (research / writing / critique) via tools. Each delegation appends one completed entry to state["delegations"].

Test Steps

1. Basic Functionality

• Navigate to /demos/subagents; verify the page renders within 3s with the "Sub-agent delegations" panel on the left and the CopilotChat on the right
• Verify the delegation panel header reads "Sub-agent delegations" with a 0 calls counter on initial load
• Verify the three sub-agent role indicator chips render at the top of the panel — Researcher, Writer, Critic — with dimmed (un-fired) styling
• Verify the empty-state hint reads "Ask the supervisor to complete a task. Every sub-agent it calls will appear here."
• Verify the chat input placeholder reads "Give the supervisor a task..."
• Send "Hello" and verify the agent responds within 10s

2. Feature-Specific Checks

Suggestions

• Verify all 3 suggestion pills are visible with verbatim titles:
  • "Write a blog post"
  • "Explain a topic"
  • "Summarize a topic"

Multi-Agent Delegation (Research → Writing → Critique)

• Click "Write a blog post"
• Within 60s verify the chat stream renders 3 inline activity cards in sequence:
  • data-testid="subagent-card-researcher" — Researcher activity card
  • data-testid="subagent-card-writer" — Writer activity card
  • data-testid="subagent-card-critic" — Critic activity card
• Verify each card walks through statuses: starting → running → done (each card surfaces data-status="complete" once finished)
• Verify each card's data-testid="subagent-result" contains real generated text (not "(empty)" and not the showcase intro boilerplate)
• Verify the side-panel "Sub-agent delegations" list shows 3 delegation-entry cards (one per sub-agent), each labeled Research / Writing / Critique with the corresponding task
• Verify the Supervisor running badge appears next to the header while the supervisor is active and disappears once it finishes

Active-Subagent Banner

• During a delegation run, verify the sticky "active subagent" banner (data-testid="active-subagent-banner") appears at the top of the chat panel and names whichever sub-agent is currently running
• Verify the banner disappears once the supervisor completes

Critic Loop Regression (one critic card per run)

• Confirm that exactly 1 critic card renders per pill click — the count must be stable across a 5s dwell after completion
• If a second critic card appears, the supervisor is re-entering the critic — file a bug (see subagents_agent.py instruction enforcing single-call-per-tool)

All Pills Run the Same Flow

• Click "Explain a topic" — verify the same 3-card / 3-delegation pattern
• Click "Summarize a topic" — verify the same 3-card / 3-delegation pattern

3. Error Handling

• Send an empty message; verify it is a no-op
• If a Gemini sub-agent call fails, verify the delegation log shows the error as a completed entry whose result contains the user-facing failure message (server logs preserve the traceback)
• Verify no uncaught console errors during normal usage

Expected Results

• Chat loads within 3 seconds; first delegation card appears within 60 seconds
• Each of the 3 sub-agents fires exactly once per pill click
• Card results are real generated text, not boilerplate
• Side panel and inline chat stay synchronized via state["delegations"]
• No console errors, no stuck-state, no critic-loop regression