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Chainguard Harness hunts live-app vulns with Claude Mythos 5.1 via Claude Marketplace

Chainguard opened a beta waitlist for Harness: it rebuilds your app from source in an isolated, no-egress microVM, lets Claude Mythos 5.1 probe the live instance for exploitable vulns, and ships only findings that replay plus fixes that stop them—each reviewed by a Chainguard engineer. Buy it through Anthropic’s Claude Marketplace and apply existing Anthropic commitments.

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Chainguard Workspaces puts coding agents in hardened microVMs with no local secrets

Chainguard opened a beta for Workspaces: Chainguard hardened microVMs where developers and agents work via chainctl develop , with working tree sync, warm snapshots, host side short lived credential injection, and optional egress policies—so agents never touch local corporate secrets. Claude is supported today; pairs optionally with Chainguard Checks as a CI gate before PRs…

Chainguard Blog

GitHub Apps and fine-grained PATs can now create repos without full admin rights

A new repository creation:write permission lets an app, agent, or fine grained PAT create repositories without repository administration:write (which also allows delete and transfer), and installation repositories:write lets automation add or remove repos from app installations without a classic PAT. GitHub Apps also gain offline access for refresh tokens, easing a move back to expiring user tokens…

GitHub Changelog

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