Catch issues before they break production.

Praxen Inc. analyses the potential impact of every pull request on production. It checks each change against your live infrastructure and tells you what could go wrong before you merge.

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Impact

Praxen Inc. analyses every pull request for its impact on production

It reads the change against the infrastructure it deploys to. If production would break, it comments with the cause, the evidence and a fix, and the check fails. Make the check required and the merge is blocked.

Start analysing
github.com/Praxen Inc./orders-api/pull/482

Add trigram index for order search #482

Open rvidal wants to merge 1 commit into main from order-search-trgm
Conversation 1 Commits 1 Checks 2 Files changed 1
praxen bot commented 2 minutes ago ···
Caution

Merging this pull request may degrade production (high impact).

Merging this blocks every write to orders while the index builds. migrations/0114_order_search_trgm.sql:3 adds CREATE INDEX … USING gin (search_text gin_trgm_ops) without CONCURRENTLY, and a plain CREATE INDEX takes a full write lock on orders for the whole build. Checkout sustains ~38 writes/s on that table; each one queues behind the lock until the build finishes.

To make this safe: build the index with CREATE INDEX CONCURRENTLY outside the transactional migration.

orders-db · writes per second · last 48h
0 20 40
-48h -24h now
every one of these writes blocks while the index builds

Praxen Inc. analysed de91b47 for production impact.

Some checks were not successful 1 failing and 1 successful check
ci / test Successful in 2m 4s Details
Praxen Inc. production impact Non-concurrent index build locks writes on orders Details
Merging is blocked

Observability

It adds missing observability to your code

When a route can't emit one useful event per request, it adds the instrumentation using the setup you already have, as a small change of its own that can merge first.

Add observability
Observability improvements for #218 praxen +22 −2
Requests do not produce one context-rich event 3 affected routes · found after the last sync
server/api/checkout.post.ts mirrors your existing OpenTelemetry setup; no new dependencies
export default defineEventHandler(async (event) => {
const body = await readBody(event);
- const order = await createOrder(body);
- return { orderId: order.id };
+ return tracer.startActiveSpan("checkout", async (span) => {
+ const canonical: Record<string, unknown> = {
+ route: "checkout",
+ requestId: event.context.requestId,
+ cartId: body.cartId,
+ traceId: span.spanContext().traceId,
+ };
+ try {
+ const order = await createOrder(body);
+ span.setAttributes({ "order.id": order.id, "order.amount_cents": order.amountCents });
+ Object.assign(canonical, { orderId: order.id, amountCents: order.amountCents, outcome: "ok" });
+ return { orderId: order.id };
+ } catch (err) {
+ span.recordException(err);
+ span.setStatus({ code: SpanStatusCode.ERROR });
+ canonical.outcome = "error";
+ throw err;
+ } finally {
+ span.end();
+ emitCanonicalLogLine(canonical);
+ }
+ });
});
Opened against the pull request's own branch, as a small change that can merge first.

Watch

It keeps watching after the merge and finds what broke

Praxen Inc. watches production after every deploy. When something regresses, the issue arrives with the change that landed just before it.

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Galaxy
checkout-edge Worker
Critical Critical to your architecture.

Issue hotspot: 4 issues in the last 7 days

Change hotspot: 12 changes in the last 7 days

Cloudflare · Praxen Inc. · earth · Compute
hd-prod Hyperdrive
Critical Critical to your architecture.

Change hotspot: 7 changes in the last 7 days

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ingest-events Lambda function
Standard Important to your architecture.

Issue hotspot: 2 issues in the last 7 days

AWS · Praxen Inc.-prod · us-east-1 · Compute
payments-db Database
Critical Critical to your architecture.

Issue hotspot: 1 issue in the last 7 days

Change hotspot: 3 changes in the last 7 days

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Investigate

checkout-edge

Worker · Production · Synced 2 minutes ago
Cloud GraphProblems
10 problems on this resource, newest first
  • Critical latency degradation in checkout-edge worker
  • checkout-edge P99 latency above 2s for 5m
  • Subrequest count climbing against its weekly baseline
  • CPU time p99 above baseline after deploy 4a91c7e
  • Cache hit ratio dipped during the analytics backfill
  • Error rate on /checkout/session above baseline
  • Durable Object storage reads doubled overnight
  • Subrequest timeout to payments-api, single occurrence
  • Fix run stopped on a sandbox clone failure
  • Wall time p99 regression traced to the analytics backfill
2 detections have not been investigated on their own.

What Praxen Inc. analyses in every pull request.

Checks against live infrastructure

Praxen Inc. compares each pull request with the config, capacity and dependencies of the resources it deploys to.

Uses current production data

It looks at what your services are doing right now, so the analysis reflects production today.

Works on AI-written code

Hand-written or AI-written, every pull request gets the same analysis.

Adds missing observability

If a route can't emit one useful event per request, Praxen Inc. adds the instrumentation as a small change of its own.

Explains how it breaks

Each comment shows what would go wrong, the evidence behind it, and a one-line fix.

Blocks risky merges

The 'Praxen Inc. production impact' check fails when production would degrade. Make it required in branch protection to block the merge.

It plugs into what you already run.

AWS Cloudflare Vercel Render Fly.io Kubernetes PlanetScale Supabase Modal Railway Convex GitHub Slack Linear Datadog Honeycomb Axiom Grafana Cloud Sentry Devin Cursor Factory MCP Server Every integration

Loved by developers

chronark @chronark just 2 hours after signing up for @praxen it prevented a potential problem in production. I changed the request body schema for an API endpoint and if I would've just merged it, one of our dashboard pages would've crashed until the API was fully deployed too. Pretty simple mistake, but I forgot this time. praxen didn't Ben Anthony @benjamin_ACD a few days into using @praxen and I have merged like 40 something worthwhile PRs, seems my agents think the PRs are much higher utility than what detail was giving me Ben @nurodev So far @praxen is very cool! Even more that it's finding issues, creating fixes and then working with @pullfrogai in PR's to improve it even more. luna @ImLunaHey if you haven’t tried out @praxen at work i’d highly suggest it. Jason @Jasonpraful When I installed praxen for the first time my expectations were pretty low. Couple weeks in I’m speechless - it just works everything is all of a sudden fully autonomous Utpal Nadiger @utpalnadiger bullish on praxen

Related guides

All deployment safety guides

Common questions.

How does production impact analysis work?

A GitHub app analyses each pull request against the live infrastructure it deploys to. The result lands as a comment plus a 'Praxen Inc. production impact' check.

Will it block my merges?

Only if you want it to. Require the 'Praxen Inc. production impact' check through branch protection and risky merges are blocked. Leave it optional and the verdict is advisory.

Is this for AI-generated code?

It's for all code, but it matters most when nobody read the change closely. AI-written or hand-written, the same analysis catches the mistake.

How is this different from CI?

CI runs your tests against the code. Praxen Inc. analyses the change against production: the config, capacity and dependencies it lands on, and what they emit right now.

Will it ever merge or deploy on its own?

Not by default. Every change goes through your review, and anything that merges or touches production on its own is something you switch on.

How often does it fail a pull request?

Rarely. Pass is the default, and a fail has to name how a line in the diff breaks production. “Might” does not count.

Does it comment on every push?

One comment, updated in place. Documentation and test-only changes pass straight through without one.

Does the instrumentation it adds bring new dependencies?

No. It writes with your logger, your OpenTelemetry setup and your conventions, and it never logs a secret.

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Merge with confidence. Praxen Inc. checks every change against production first.

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