🥋 Samurai Agent

Prevent regression bugs by giving AI coding agents runtime root-cause context — and reviewing their fixes before you ship.

TL;DR

The Problem

AI coding tools often introduce regression bugs when fixing issues because they don’t understand the real root cause of the problem.

The Solution

Samurai Agent reduces regression bugs by acting as a guardrail for AI-generated fixes:

• Runs your code to extract runtime-based root cause analysis
• Provides this accurate root-cause context to AI coding agents (e.g. Cursor)
• Reviews the fix afterward to ensure the root cause is resolved and no new bugs are introduced

Why Samurai Agent Works

• Built specifically for JavaScript / TypeScript
• Leverages a JavaScript / TypeScript bug database containing real-world failure patterns
• Combines runtime behavior + known bug patterns to improve root cause accuracy

Who It’s For

• Engineers who rely heavily on AI to write and fix code
• Developers who want to move fast without breaking existing functionality

How to Use

1. Add relevant files and describe the bug

Add the files that are most relevant to the bug and briefly describe the issue.
Providing suspicious or related files significantly improves root cause accuracy.

2. Run root cause analysis

Samurai Agent runs your code to identify the actual root cause using runtime information.
A visual summary helps you understand what’s happening at a glance.

3. Apply the fix with your AI coding tool

Copy the generated prompt and paste it into your AI coding agent (e.g. Cursor).
The prompt includes verified root-cause context, allowing the AI to double-check the cause before fixing the bug, which greatly reduces mistakes and regressions.

Tip: Using Cursor’s Plan mode works especially well, but any AI coding tool can be used.

4. Review the fix to avoid regressions

After the AI applies the fix, return to Samurai Agent and click Review Fix.
Samurai Agent verifies that:

• the root cause is actually resolved
• no new regression bugs are introduced

⚡ Quick Start (2 minutes)

📹 Watch Quick Start Tutorial →
📹 Watch Latest Demo Video →

How to Set Up

1. Install the extension

Search for “Samurai Agent” in the VS Code Marketplace (or any VS Code–compatible IDE) and install it.

2. Open Samurai Agent

• Click the Samurai Agent icon in the VS Code sidebar, or
• Press Cmd+Shift+P (Mac) / Ctrl+Shift+P (Windows/Linux), then type “Samurai Agent”

3. Try Samurai with no setup (free trial)

You can start using Samurai Agent immediately, without an API key or beta code.

• Samurai Pro — deeper, runtime-based root cause analysis
  (free trial · daily shared limit)

• Samurai Lite — faster checks for simpler issues
  (free tier · daily shared limit)

This lets you quickly see what Samurai’s root cause analysis looks like out of the box.

When the daily free-trial limit is reached, you can either try again later or unlock full access using one of the options below.

4. Unlock full access (recommended)

Option A: Add a beta code

If you have a beta code, add it in the Settings tab to unlock full access.

👉 Don’t have a beta code?
You can request one (and receive free credits) here:
https://samurai-agent.tech/

Option B: Add your own API key

You can also unlock Samurai by adding your own API key in the Settings tab.

Supported providers:

• Gemini (recommended — Gemini Flash 3)
• OpenAI
• Anthropic

Supported Environments

Samurai Agent works with any JavaScript / TypeScript codebase, including but not limited to:

• Node.js applications
• Frontend frameworks: React, Vue, Angular
• Full-stack frameworks: Next.js
• Backend frameworks: Express
• Monorepos and mixed JS/TS projects

If your project runs on JavaScript or TypeScript, Samurai Agent can analyze it.

🔒 Privacy & Data

Your code stays private

• Samurai Agent acts as a root-cause context layer for AI coding agents.
• Analysis is performed locally, and only the minimum required context is sent to your selected LLM provider.
• Your source code and conversations are never stored or used for training by Samurai Agent.
• Samurai Agent never modifies your files.

No fix or chat data stored

• Samurai Agent does not store chat messages, fixes, or code diffs.
• We collect only anonymous usage events (e.g. “analysis started”, “review fix clicked”) to improve product reliability.

You’re in control

• Telemetry is optional and can be disabled at any time in the extension settings.

❓ FAQ

Does Samurai Agent modify or apply code fixes?

No.

Samurai Agent never edits your source code.
It provides root-cause context and reviews AI-generated fixes, but all code changes are applied by your AI coding tool (e.g. Cursor) or by you.

What is Samurai Agent best used for?

Samurai Agent is designed for:

• Providing accurate root-cause context to AI coding agents
• Reviewing AI-generated fixes to ensure the root cause is actually addressed
• Catching regression risks before code is shipped
• Situations where AI-generated fixes feel “correct” but break something else

When should I not use Samurai Agent?

Samurai Agent is not optimized for:

• Simple syntax or type errors
• Formatting or linting issues
• One-line bugs with obvious stack traces

In those cases, direct AI fixes or linters are usually faster.

Does Samurai Agent replace AI coding agents like Cursor or Copilot?

No. Samurai Agent is complementary.

• AI coding agents focus on writing code
• Samurai Agent focuses on understanding root causes and reviewing fixes

Many users use Samurai Agent as a guardrail before merging AI-generated changes.

Does Samurai Agent execute my code?

Yes — only when needed to extract root-cause signals.

Execution happens in a controlled sandbox for analysis purposes. Your original files are never modified, and execution is limited strictly to context generation and fix review.

Is my code or fix data used for training?

No.

Samurai Agent does not use your code, fixes, or conversations for training and does not store them. Only minimal context is sent to your selected LLM provider, and data handling then follows that provider’s policies (e.g. OpenAI, Google, Anthropic).

💬 Support & Feedback

Samurai Agent is evolving quickly as a context and review layer for AI coding agents, and your feedback directly shapes its direction.

• Questions, feedback, or feature requests
  • Email: yuto@samurai-agent.tech
  • X (Twitter): @yuto_samurai_ai