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Change Simulator

Simulate before you deploy.

See what your change could break, slow down, or expose. In under a minute.

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Why Simulation?

  • [01]

    Keep work moving.

    Answer the questions that stall changes. Spend less time waiting for a review or expert.

  • [02]

    Cut the rework.

    Let agents simulate changes to your deployed environment while they code. Give them the right foundation before they build on bad assumptions.

  • [03]

    Keep services running.

    Catch changes that could cause an outage, slow a service, or open a security gap. Fix it while coding, not after deployment.

What it Does

Stag Change Simulator

Stag simulates proposed changes against a model of your deployed environment. See why systems are at risk and how to fix it.

  1. Simulate

    Submit a proposed change. Stag simulates its downstream effects across your current environment.

    The Stag console inspections table with the Decision filter menu open and the pointer on Critical.

  2. Analyze

    Open a report. See which systems are at risk, how the effects spread, and how to fix it.

    A Stag report for a security group change: an UNSAFE verdict, CRITICAL risk, its impact summary and the Terraform changeset.

  3. Ask

    Ask follow-up questions in plain language. Understand the risk and explore safer alternatives.

    The Stag chat panel beside a dependency graph, explaining why a change was rejected with a table of simulation metrics and its failure patterns.

Now you can

  • [01]

    Look past a passing test.

    A change can pass review and testing and still break a connected system. Simulate its effects before it reaches production.

  • [02]

    See every corner case.

    Stag simulates a change’s effects across more interactions than anyone could test by hand. Same change. Same model. Same result.

  • [03]

    Bring evidence to review.

    Show reviewers the verdict, the affected systems, and the reason. Give them what they need to approve the change or ask for a fix.

  • [04]

    Account for changes you didn't make.

    Simulate against the current environment, including the load balancer some team added 5 minutes ago. See the effects without tracking down every owner.

  • [05]

    Check effects against your policies.

    Give Stag your policies and standards. Simulation includes them in its results and findings.

  • [06]

    Connect it. Start simulating.

    Connect your cloud or Kubernetes environment. Stag builds the model. No model training or custom rules required.

FAQ

Frequently Asked Questions

No. Run a simulation from your terminal or let your coding agent run it while you work. Check the change before you open a pull request.

Only if you choose. Set your pipeline to warn or block when Stag flags an unsafe change.

Change Simulator evaluates a proposed change. Environment Explorer answers questions about your deployed environment. You don’t need to propose a change to use Explorer.

Related capabilities

See the verdict on your own change.

Walk through a simulation with our engineers.

Book a demo