Use a PreToolUse SDK hook to prepend `unset ANTHROPIC_API_KEY CLAUDE_CODE_OAUTH_TOKEN` to every Bash command Kit runs, preventing secret leakage via env/printenv/echo/$PROC. Secrets are now passed via stdin JSON instead of mounted env files, closing all known exfiltration vectors. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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