Cheeisepy/preflight-gcp-iam-guardrails

🛡️ GCP IAM Guardrails for Claude Code — free sample

Stop your AI coding agent from running destructive gcloud, gsutil, and bq commands against your GCP project. This repo is a free sample from the Preflight studio — catch it before it ships.

Letting Claude Code (or any agent) touch a real cloud project is great until the day it runs gcloud projects delete or gsutil rm -r on the wrong bucket. These deny rules make Claude Code refuse those commands outright — no confirmation, no "oops."

What's in this free sample

sample-deny-rules.json — 10 of the highest-impact deny rules from the full pack, as a ready-to-merge settings.json fragment. Drop the permissions.deny array into your project's .claude/settings.json and Claude Code will block:

Blocked command	Why it matters
gcloud projects delete	nukes an entire project
gcloud * set-iam-policy	overwrites your whole IAM policy (lockout / privilege escalation)
gcloud * remove-iam-policy-binding	silently strips access
gcloud iam service-accounts delete	kills a service account other things depend on
gcloud iam service-accounts keys delete	breaks live auth
gcloud compute instances delete	deletes a VM
gcloud storage buckets delete	deletes a bucket
gcloud storage rm / gsutil rm -r	deletes objects, recursively
gsutil iam ch *allUsers*	makes private data public
bq rm	drops BigQuery datasets/tables

Install (30 seconds)

1. Open sample-deny-rules.json.
2. Merge the permissions.deny array into your project's .claude/settings.json (create the file if it doesn't exist).
3. Done. Try asking Claude to delete a bucket — it refuses.

What the full product adds

The free sample is the "obvious catastrophes" layer. The paid product is the defense-in-depth version:

• 27 deny rules (17 more than here), covering snapshots, disks, networks, firewall rules, logging sinks, service-account keys, and more.
• An ask tier for risky-but-recoverable operations (add-iam-policy-binding, stop instance, create SA key) so they pause for human approval instead of being blocked.
• A curated allow list so safe read-only commands (list, describe, get-iam-policy) never prompt — no guardrail fatigue.
• A PreToolUse hook (block-destructive-gcloud.sh) that catches obfuscated and chained commands the static rules can miss.
• A 31-assertion test suite proving every block/allow decision, so you can trust it.
• INSTALL.md, SKILL.md, and worked examples/ (allowed vs blocked).

→ Get the full pack on Gumroad

GCP IAM Guardrails for Claude Code — $24

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From Preflight — guardrails for agentic coding & cloud. See also: Terraform Plan Reviewer · webOS QA Checklist Runner.