ShadowTel replays real production traffic against every pull request and blocks the merge if the change makes your system slower, less reliable, or more expensive to run.
Agents write code faster than any team can read it. The checks that used to catch expensive changes were people, and the people are underwater.
Code merging with no review at all — not human, not agentic.
Production incidents per code change.
Median time senior engineers spend in code review.
Faros AI Engineering Report 2026 — two years of telemetry from 22,000 developers across 4,000 teams.
No new agent in your request path. No staging environment to maintain.
Request mirroring you already have in Envoy, nginx, or your service mesh. No code changes.
We replay the mirrored traffic against it, holding writes and outbound calls inside the sandbox.
Compared against your OpenTelemetry baseline, with the dollar delta attached. You set the budgets.
A gate with authority to stop a deploy has to be safe before it is useful.
Mutating requests are held or served by sandbox-local stand-ins. They never reach production data stores.
Payment providers, email, and third-party APIs are stubbed at the sandbox boundary. Nothing bills, nothing sends.
Mirroring is fire-and-forget at your proxy. Your users' requests are never held waiting on us.
I'm looking for design partners already shipping agent-written code and feeling it. Half an hour, no deck.
Book a call ajith@shadowtel.com