● Open beta

Replay the run
you can't repeat.

Your agent places calls, writes records, drives machines. Reprieve watches the traces you already collect, catches the run that went wrong, and replays it where nothing real happens — then hands you a fix proven by a test.

Get started free → See how it works
No call goes out, no record changes, no command reaches a device during replay · a human approves every fix
incident INC-218 → pull/412
Dashboard preview

Plugs into the traces you already collect — two env vars, no code change

OpenTelemetryLangGraphOpenAI Agents SDKCrewAIPydantic AILangSmithLangfuseVercel AI SDKraw logs OpenTelemetryLangGraphOpenAI Agents SDKCrewAIPydantic AILangSmithLangfuseVercel AI SDKraw logs

Your agent doesn't just answer questions.
It does things that can't be undone.

You find out too late.A wrong call to a patient, a bad value sent to a machine — you hear about it from the person it happened to, not from a dashboard.
You can't run it again to see.Re-running the failure places another call, writes another record, sends another command. So the bug never gets properly debugged.
The fix is a hope.You tweak a prompt and ship. Nothing proves that run can't happen again — to the next patient, the next customer, the next part.
Dashboards only watch.Observability shows you the damage after it's done. It doesn't stop the same failure from shipping again next month.

If your agent did it,
we can replay it.

Voice calls, patient records, payments, machine instructions — whatever your agent touches, Reprieve re-creates the failed run with the real world disconnected, and turns it into a fix with proof.

Watches every run

Point your existing OpenTelemetry exporter at us — two environment variables, no SDK. Failed runs, runaway loops, and risky actions surface on their own, the moment they happen.

Replays where nothing is real

The failed run re-executes in a sealed microVM, disconnected from your phone lines, records, and devices. Nothing it does can reach the outside world — by construction, not by a setting.

Failures become tests

Every failure leaves a regression test in your repo. The run that hurt a patient, a customer, or a part can never quietly come back.

Fixes proven by execution

The test fails on your current code and passes on the fix — proof the failure is gone, not a patch that merely looks right.

Framework-neutral

Works with the traces you already emit — LangGraph, OpenAI SDK, CrewAI, or fully custom. No lock-in, no rewrite.

/ 01

Catch

A run goes wrong in production — a misread order, a wrong detail on a call, a bad parameter on its way to a machine. Reprieve spots it in your trace stream the moment it happens and pins the exact step that broke.

OTel · LangSmith · Langfuse · paste
incident/INC-218 · critical
Incident detail
/ 02

Replay

The run re-executes in a sealed microVM, disconnected from the real world. No phone rings, no record changes, no device moves. First, proof the failure is real: a new test fails on your current code.

sealed microVM · nothing real is touched
sandbox/run · sealed
Phase 1 · reproduce
/ 03

Fix & prove

Reprieve writes the fix and runs the same test again. It failed before; it passes now. That's proof by execution — not a confident-sounding explanation of why the patch should work.

reproduced ∧ fixed = proven
fix-inc-218.diff · + test
Phase 2 · verify
/ 04

Ship

A pull request lands with the fix, the test, and the full story of what went wrong — on a branch, never your main. Your engineer reviews and merges. A human approves everything that ships.

read-only access · human merges
pull/412 · open
Pull request

What sets us apart

Observability shows you the damage. Reprieve ships the fix that prevents the next one — with proof.

Reprieve
Ships a verified fix as a pull request
Replays the failure with the real world disconnected
No calls, writes, or commands can escape the sandbox
Leaves a regression test in your repo
Framework-neutral — no lock-in
Observability dashboards
Show you charts; the fixing is yours
Replay is for looking, not for testing
No side-effect safety when you re-run
Nothing durable — the bug can return
Often tied to one framework
− the run you couldn't safely re-run + a fix with a test that proves it's gone

Bring one bad run.

Start with a single real failure — a bad call, a wrong record, a bogus command. We replay it safely, fix it, prove it, and open the PR — together.

Get started free ↗ Open dashboard
Replays touch nothing real Proof by test, not by promise A human merges every change