# croissants

- **Event:** [RAISE Summit Hackathon](https://cerebralvalley.ai/e/raise-summit-hackathon)
- **When:** Jul 4 at 9:00 AM – Jul 5 at 7:00 PM (GMT+2)
- **Where:** Paris, France
- **Team:** [Din Sokheng](https://cerebralvalley.ai/u/Sokheng08), [Ebuka Amadi-Obi](https://cerebralvalley.ai/u/ebuka), [Thuo Menghor](https://cerebralvalley.ai/u/menghor_thuo), [Hok Seng](https://cerebralvalley.ai/u/seng_hok), [Pierre-Louis Pecheux](https://cerebralvalley.ai/u/plpx)
- **GitHub:** https://github.com/SokhengDin/qa-hackathon
- **Demo video:** https://youtu.be/GVL60pWWg4A
- **Gallery:** https://cerebralvalley.ai/e/raise-summit-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/raise-summit-hackathon/hackathon/gallery/86

- A FastAPI runner that queues a run to Postgres, claims it, and drives the ADK pipeline one
  step at a time — invoking the Runner per step with a state_delta carrying current_step
  and each dependency's status — while translating every ADK event into a raw run_logs trace.
- A conditional workflow graph (TestRunner → FixWriter → Verifier → PRAgent) where the
  needs_fix edge is emitted by an after_agent_callback only on a medium/high-confidence
  failure; passing steps and low-confidence failures terminate early.
- The feature-gate, deterministic evidence-escalation trigger, and confidence-scoring
  callbacks — the gating and observability layer that keeps dependency and diagnosis logic in
  code, out of the LLM's discretion.
- A shared-Chromium design: one Playwright-launched Chromium at startup that both Computer
  Use (`connect_over_cdp`) and chrome-devtools-mcp (`--browserUrl`) attach to — never launched
  or torn down per tool call.
- The Python ↔ web DB seam: Python reads/writes Prisma-owned tables via raw asyncpg and
  never migrates; the Next.js app owns schema and migrations.

## Challenges

- Two agent surfaces that cannot be combined. Computer Use and the Antigravity agent are
  separate surfaces that can't share one call, so state is handed off explicitly (evidence
  bundle out of TestRunner, environment_id into FixWriter) rather than passed as tools.
- Reliable escalation on stage. Trusting the LLM to decide "should I check the console now?"
  was too flaky for a live demo, so escalation was made a deterministic callback on Computer
  Use's own result instead of a prompt instruction.
- Browser sharing. Computer Use and chrome-devtools-mcp both need the *same* live page;
  solved with a single keep-alive Chromium on CDP :9222 that both attach to.

## Results

QA Sentinel runs live, end to end against the bundled cambria-shop demo app, which
carries a deliberate bug: checking out ceramic-mug hits a missing shipping-cost key and raises
an unhandled KeyError → bare HTTP 500. On a run, the pipeline:

1. drives the checkout via Computer Use and observes the failure,
2. escalates to chrome-devtools-mcp *because* that step failed, capturing the 500 and the
   console/network trace,
3. scores the evidence, writes an evidence-grounded fix,
4. re-verifies the error is gone, and
5. opens a GitHub PR whose body is the full evidence bundle.

What it demonstrates: an agent that reasons from root cause, not symptom, knows what it
*can't* diagnose (and defers those to a human), and produces a **verified, reviewable
deliverable** — the PR + evidence trail — rather than a confident guess.

## More from RAISE Summit Hackathon

- [HACKCOFFEEBEANS](https://cerebralvalley.ai/e/raise-summit-hackathon/hackathon/gallery/83)
- [RAID](https://cerebralvalley.ai/e/raise-summit-hackathon/hackathon/gallery/84)
- [Robinsun](https://cerebralvalley.ai/e/raise-summit-hackathon/hackathon/gallery/85)
- [Bluemoon](https://cerebralvalley.ai/e/raise-summit-hackathon/hackathon/gallery/87)
- [DriftRadar](https://cerebralvalley.ai/e/raise-summit-hackathon/hackathon/gallery/88)
- [MILA](https://cerebralvalley.ai/e/raise-summit-hackathon/hackathon/gallery/89)

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Markdown version of https://cerebralvalley.ai/e/raise-summit-hackathon/hackathon/gallery/86. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt