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“I built a complex solution — and realized I don’t understand it.”

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Review & ImproveSecurityFeaturesRequirementsUXYour own .md

Write what to check in Markdown — your own standards. Review your app with people or AI, turn findings into fixes, run again.

Security ReviewRun #3 · 2 hours ago security-standards.md

✕ Authentication 1
✓ Authorization 5
! Data protection 2
✓ Dependencies 0
✓ Infrastructure 0

▲ FailMissing authorization checksrc/api/orders.ts

Users can open other users’ orders by changing the order ID.

Reviewer 1 hour ago
Add an ownership check and a test case.

Fix with Claude Code →

Run history#3 8 passed 2 issues#2 6 passed 4 issues#1 4 passed 6 issues

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1 Understand

🔒 penwiki.com/acme/uploads

Uploads

Customers attach a photo to an order.

The browser sends the file to /upload
The server saves it in uploads/
The order links to it

Key files: app.py · orders.py

Review

Check it against
your own rules.

2 Review

security-review.md

⚠️ 8/10 pass · 2 need attention

✅ Secrets come from the environment
✅ Every route checks who is asking
❌ Uploads have no size limit app.py:14
⚠️ Errors show stack traces

Limit uploads to 2 MB.Fix it →

Ran on acme/shop · main @ 3f2a1c9 · 2 uncommitted changes

Change

Comment on a finding.
Claude Code changes
the code.

3 Change

app.pyUpdated by Claude Code

13   app = Flask(__name__)14   app.config["UPLOADS"] = "uploads"15+  app.config["MAX_CONTENT_LENGTH"] = 2 * 1024 * 102416+17+  @app.errorhandler(413)18+  def too_large(e):19+      return {"error": "max 2 MB"}, 413

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security-review.mdWhere it differs

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