# Review by Staff Security Engineer (Round 1)

## Review Complete

**VERDICT: approve**

Here's a summary of the review from my perspective as **Staff Security Engineer**:

### What's Good
- **PAT scoped to minimal privilege** — fine-grained token with only `contents:write` on the tap repo, well-documented rotation procedures
- **Non-git-repo guard** — prevents `.colonyos/` config creation in `$HOME` or `/`, addressing a real security concern about overly broad agent permissions
- **Env file `chmod 600`** + recommendation for `systemd-creds` in production
- **All GitHub Actions SHA-pinned** — no tag-based references that could be hijacked
- **SHA-256 input validation** in formula generation script
- **No secrets in committed code** — verified via pattern scan
- **All 394 tests pass** across the affected test files

### Hardening Recommendations (Non-Blocking)
1. **Token in clone URL** (`release.yml`) — use credential helper instead of embedding in URL for defense-in-depth
2. **`read -rs`** instead of `read -r` for API key prompts in `provision.sh` — prevents terminal echo
3. **Pin `homebrew-pypi-poet`** version in formula generation script — supply chain hardening
4. **`curl | bash`** for NodeSource — standard practice but worth noting
5. **Duplicate PAT docs** — `docs/` and `scripts/` both have setup guides that may diverge

Full review saved to `cOS_reviews/reviews/staff_security_engineer/20260330_182656_round1_add_brew_installation_we_should_be_able_to_have.md`.