Axiom – AI Code Review

Axiom reviews your code using Google Gemini and shows issues directly in the VS Code sidebar — grouped by severity, with inline diffs and one-click fixes.

Before you start

You need a free Google Gemini API key. Get one at aistudio.google.com/app/apikey — no credit card required.

Quick start

1. Click the Axiom icon in the activity bar (left sidebar)
2. Click Add in the key row at the bottom of the panel and paste your API key
3. Open any code file and click Review File

That's it. Results appear in the panel within a few seconds.

Reading the results

Issues are grouped into three severity levels:

• 🔴 Errors — bugs, invalid syntax, broken logic
• 🟡 Warnings — risky patterns, potential failures
• 🔵 Suggestions — style, naming, performance

Click any issue to jump to that line in your editor and see the full explanation and suggested fix.

Click a group header (Errors / Warnings / Suggestions) to isolate that severity and hide the rest. Click again to show all.

Fixing issues

With an issue selected in the panel:

Fixed and ignored issues are remembered — they won't reappear if you close and reopen the sidebar.

Review scope

Click the ▾ arrow next to the Review button to switch scope:

You can also right-click anywhere in the editor and choose Axiom: Review File or Axiom: Review Directory.

History

Every completed review is saved automatically. Click the 🕐 button in the results header to see your last 5 reviews and restore any of them instantly — no API call needed.

Keyboard shortcuts

Settings

Open settings with Ctrl+, (or Cmd+,) and search Axiom, or click the ⚙ button in the panel.

Review profiles

• quick — errors and critical bugs only, fastest
• full — everything: errors, warnings, style, naming, performance
• security — focused on vulnerabilities, injection risks, auth flaws

Managing your API key

The key row at the bottom of the panel shows your current key status at all times:

• 🟢 AIza••••1234 — key is set and ready
• 🔴 No API key set — click Add to enter one

Click Change at any time to update your key. To remove it entirely, run Axiom: Reset API Key from the Command Palette.

Your key is stored in VS Code's Secret Storage — it never leaves your machine except in requests to Google's Gemini API.

Supported languages

JavaScript, TypeScript, Python, Java, Go, Rust, C, C++, C#, Ruby, PHP, Swift, Kotlin, Dart, Shell/Bash, SQL, HTML, CSS

Privacy

Your code is sent to Google's Gemini API for analysis. Axiom itself stores nothing — no telemetry, no analytics, no external servers. Your API key is stored locally in VS Code's built-in Secret Storage and is never shared with anyone.