# Polylane for impact analysis

> Catch issues before they reach production: every pull request reviewed against the live infrastructure it deploys to.

Catch issues before they reach production. Every pull request reviewed against what's live, not just the diff. The review knows what the code deploys to: the context graph, current telemetry, and the changes that landed before it. Especially the code nobody read closely: yours, your team's, your agents'.

- Every pull request reviewed against live production
- A comment with the mechanism, the evidence, and the one-sentence fix
- A required check that blocks the risky merge

## How it plays out

### The warning lands before the merge. The mechanism, the evidence, and the fix: right where you review.

When a change would degrade production, Polylane comments with the mechanism, the evidence, and the one-sentence fix, and the 'Polylane production impact' check fails. Require the check and the merge is blocked.

### It improves the code, not just gates it. Missing instrumentation gets added right on your branch.

When a route can't produce one context-rich event per request, Polylane writes the observability improvement on the branch itself, mirroring your existing setup: it can merge before the branch does.

### And it keeps watching after the merge. Whatever slips through gets caught in production.

Checks read the actual signal series after every deploy. When something regresses, the issue arrives with the change that landed just before it, and the loop runs: investigation, evidence, fix.

## How Polylane works

- **It learns your system first.** The context graph maps every resource and dependency across your clouds, repos, and observability providers. Agents reason over real topology, not guesses.
- **Detection without thresholds.** Built-in checks for every provider, plus checks generated from your own saved queries and dashboards. A statistical pass and an agent decide together, and an improvement never raises an issue.
- **Investigations that show receipts.** Every claim links back to the query, log line, or change record behind it. A verdict without evidence falls back to inconclusive.
- **Writes are earned, never assumed.** Accounts connect read-only. Rollbacks are off by default, rate-limited, and on the record. Code changes go through your normal review.
- **It gets sharper every week.** Memories, daily notes, and monitoring queries re-confirmed against real data: July's investigation learns from June's.

## Questions

### How does AI pull request review work?

Polylane connects to GitHub as an app and reviews each pull request against the live infrastructure it deploys to: the context graph, current telemetry, and recent changes. The verdict lands as a comment plus a 'Polylane production impact' check.

### Will it block my merges?

Only if you want it to. Require the 'Polylane 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. It just matters most when nobody read the change closely: the safety net for AI-generated code is the same review that catches the hand-written mistake.

### How is this different from CI?

CI runs your tests against the code. Polylane reviews the change against production: the config, capacity, and dependencies it lands on, and the telemetry they emit right now. It shows up as a check in the same list, answering a different question.

### Will it ever merge or deploy on its own?

No. Changes reach your default branch only through your review, and rollbacks to a previous known-good deploy stay off until you enable them.

## More use cases

- [Polylane for incident response](https://polylane.com/use-cases/incident-response) ([markdown](https://polylane.com/use-cases/incident-response.md))
- [Polylane for DevOps](https://polylane.com/use-cases/devops) ([markdown](https://polylane.com/use-cases/devops.md))
- [Polylane for ticket resolution](https://polylane.com/use-cases/ticket-resolution) ([markdown](https://polylane.com/use-cases/ticket-resolution.md))
- [Polylane for observability](https://polylane.com/use-cases/observability) ([markdown](https://polylane.com/use-cases/observability.md))
- [Polylane for release management](https://polylane.com/use-cases/release-management) ([markdown](https://polylane.com/use-cases/release-management.md))
- [All use cases](https://polylane.com/use-cases) ([markdown](https://polylane.com/use-cases.md))

Ship at agent speed. Reviewed against production, every time. Early access is rolling out through the waitlist: join at https://polylane.com/#join