TestStack
Your agent completed the task yesterday. Did it still work after the last prompt change? TestStack runs it against real, isolated environments — including the internal tools and legacy UIs that will never have a clean API — and tells you the moment it breaks, before your users do.
no spam, just a note when there’s something to try.
$ teststack run --plan checkout-agent
✓ add_item_to_cart
✓ apply_promo_code
✗ complete_checkout — regression detected
agent stalled on new 2FA step (added in last deploy)
3 passed · 1 failed · re-running failed run…
of orgs call agentic AI testing pivotal to their 2026 strategy. Only 16% have actually shipped it.
of travel bookings are projected to run through AI agents by 2030 — IDC.
Why TestStack?
Built on the same isolated execution model teams already trust for QA automation — repointed at validating AI agents instead of scripted tests.
Real Isolated Execution
Every run gets its own sandboxed browser and container — no shared state, no flaky cross-contamination between tests.
Catch Regressions Automatically
Track pass rate over time and re-run failed runs automatically. Know the moment a prompt or model change breaks something that used to work.
Works Where There’s No API
Test agents against real UIs — internal tools, legacy portals, anything your agent has to click through because there’s nothing to call instead.
Resource-Safe at Scale
Quota-aware browser allocation means your test suite never oversubscribes shared infrastructure, even running many agents in parallel.
CI/CD Native
Trigger from GitHub Actions, GitLab CI, or your existing pipeline. Fail the build the moment an agent regresses.
Full Run Visibility
Every run captures a complete trace — what the agent saw, what it did, and exactly where it went wrong.