by chock-core
The mechanizable slice of CI supply-chain hardening, enforced at two points: at commit (the git hook, over staged changes) and at agent tool-use (over a tool call's arguments, as the agent writes) -- a workflow that references a third-party GitHub Action by a movable ref -- a branch or a version tag -- instead of a full 40-character commit SHA. A tag like v4 or a branch like main can be re-pointed at new code after review, so the action that runs tomorrow need not be the one that was audited today; a compromised or rug-pulled release rides in on exactly that mutability. The gate blocks an added line that references an action by a non-SHA ref (owner/repo at a tag/branch); a full 40-char SHA pin passes, local actions (no ref) pass, and 'pragma: allowlist unpinned-action' on the same line is a visible, deliberate exception. This is the OpenSSF Scorecard Pinned-Dependencies control for the slice a diff can show; signature and provenance verification stay out of scope. [Session-enforced via PreToolUse and Stop hooks; needs git and a Python 3.11+. PreToolUse judges the file a tool call would write; Stop re-reads what the turn actually left on disk, so a file written through a shell heredoc is judged too. With no working Python the hook exits 2; without git, fail-open clients allow silently. A gate that cannot reach a decision refuses rather than allowing one it never judged. Enforcement at every commit and in CI still needs chock installed in the repo. Codex requires a one-time trust review per hook -- the plugin is ADVISORY until you approve its hook, and a plugin update voids that trust until re-approved.]
Codex1 Skill