CHAINGUARD Harness
We harness frontier AI. You merge the fix.
Chainguard Harness builds your application from source in an isolated environment and lets Mythos 5.1 hunt through a live instance for exploitable vulnerabilities. Each finding is reproducible and delivered with a fix.
How Chainguard Harness works
Rebuild your app in an isolated environment
Chainguard GitHub app provides access to your repository, and Harness builds your application exactly as it ships and boots it in an isolated microVM environment.
Unleash frontier AI to do its thing
Mythos 5.1 probes the live app for exploitable vulnerabilities. Every finding is replayed in a fresh, isolated environment until it lands every time.
Act on what's proven
Remediations are built for your specific code, arriving as a Chainguard-reviewed report, ready to review and implement.
Harness focuses your preventative security actions
Get frontier AI analysis without your own access
Get the benefit of frontier vulnerability hunting without requiring frontier access.
Reduce the security noise
Take action on only fully reproducible vulnerability findings, rather than sifting through noise.
Offload patching
Review and accept Chainguard-generated fixes delivered via pull requests rather than spending engineering hours and tokens on writing your own.
CHAINGUARD Harness
Sign up for the Chainguard Harness beta waitlist
Built for the bugs that live at runtime
Chainguard Harness tests a running copy of your application instead of just static code, surfacing logic flaws, injection, and resource exhaustion that only show up in context.
Isolated by design and reproducible
Every Harness run happens in its own isolated microVM, with its own keys, no network egress, and no credentials inside. Every finding is reproduced to eliminate false positives and noise.
Fixes written for you, reviewed by you
When a vulnerability is found in your own code, Chainguard writes a fix, delivering a recommendation reviewed and approved by a Chainguard engineer. Every fix comes with the reproduction attached so your reviewers can see exactly what it closes.
Available through the Claude Marketplace by Anthropic
Chainguard Harness is now available through the Claude Marketplace, alongside the other Claude-powered tools your team already uses. You can apply existing Anthropic commitments and invoice directly with Anthropic, so customers can add Harness without a separate procurement process and consolidate their AI spend in one place.
Trust in every phase of the SDLC
Explore the rest of Chainguard's product suite
Code safely with agents
Build with trusted artifacts
Ship through trusted CI
Chainguard Harness is currently in beta and is a Technology Preview under Chainguard's Master Services and License Agreement.