CodeHealer Part 2: When Your Code Gets a Brain

By Deepan Kumar

Or: How I Stopped Worrying and Learned to Love Self-Healing Applications

Remember that time your production app crashed at 2 AM because someone forgot to check if user.email was nil? Yeah, me too. 😅

In Part 1, I showed you how CodeHealer can fix basic errors. But today, I’m going to blow your mind with the really cool stuff.

🤯 The Plot Twist: Your Code Now Has Business Intelligence

Here’s where CodeHealer gets spooky smart. It doesn’t just fix your bugs, it reads your business documentation and thinks like your product manager.

# config/code_healer.yml
business_context:
  User:
    domain: "User Management"
    key_rules:
      - "Email must be unique and valid"
      - "Password must meet security requirements"
      - "User data must be validated"

So when your User model crashes, CodeHealer doesn't just add a nil check. It actually understands that emails need validation and passwords need security. It's like having a senior developer who actually read your PRD! 📚

🎭 The Three AI Personalities

CodeHealer has three different “moods” for fixing your code:

1. The On-Premise Genius (Claude Code Terminal)

evolution_strategy:
  method: "claude_code_terminal"

This is your code’s personal therapist. It runs on your own infrastructure (dev, staging, or production), knows your entire codebase, and can make complex multi-file fixes. Perfect for when you want full control and don’t want to send your code to external APIs. ☕

2. The Cloud Wizard (OpenAI API)

evolution_strategy:
  method: "api"

The reliable friend who’s always there when you need them.

3. The Best Friend Duo (Hybrid)

evolution_strategy:
  method: "hybrid"

Why choose one when you can have both? On-Premise Genius as primary, Cloud Wizard as fallback. It’s like having Batman AND Superman on your team! 🦸‍♂️

🎬 The Real-World Magic Show

Let me show you what happens when CodeHealer meets a real bug. It’s like watching a magician, but instead of pulling rabbits out of hats, it’s pulling working code out of crashes! 🐰✨

The “Oops, I Forgot to Check for Nil” Scenario

# Before: The code that haunts your dreams
class OrderProcessor < ApplicationRecord
  def calculate_discount(amount, percentage, customer_tier)
    base_discount = amount * (percentage / 100.0)
    tier_multiplier = TIER_MULTIPLIERS[customer_tier] # 💥 BOOM! Nil error
    base_discount * tier_multiplier
  end
end

2 AM. Production down. Your phone is buzzing. You’re questioning your life choices.

But wait! CodeHealer to the rescue! 🦸‍♂️

# After: The code that makes you sleep peacefully
class OrderProcessor < ApplicationRecord
  def calculate_discount(amount, percentage, customer_tier)
    # Input validation (because we're not animals)
    return 0 if amount.nil? || amount <= 0
    return 0 if percentage.nil? || percentage < 0

    # Smart fallback for invalid tiers
    if customer_tier.nil? || !TIER_MULTIPLIERS.key?(customer_tier)
      Rails.logger.warn("Invalid customer tier: #{customer_tier}, using bronze")
      customer_tier = 'bronze'
    end

    # The actual calculation (with error handling, because we're civilized)
    begin
      base_discount = amount * (percentage / 100.0)
      tier_multiplier = TIER_MULTIPLIERS[customer_tier]
      final_discount = base_discount * tier_multiplier

      # Business rule: Max 50% discount (because we're not giving away the store)
      [final_discount, amount * 0.5].min
    rescue => e
      Rails.logger.error("Discount calculation failed: #{e.message}")
      0
    end
  end
end

Your phone stops buzzing. You go back to sleep. CodeHealer gets a raise. 😴

🎯 The Secret Sauce: MCP-Powered Business Context

Here’s the really cool part. CodeHealer doesn’t just fix your code, it searches through your Confluence docs and Jira tickets via MCP tools to understand your business rules!

# docs/business_rules.md
## Discount Rules
- Maximum discount: 50% of order value
- Bronze tier: 1x multiplier
- Silver tier: 1.1x multiplier
- Invalid tiers default to bronze

CodeHealer uses MCP (Model Context Protocol) to search Confluence for PRDs, Jira for business requirements, and reads your markdown files. It actually understands your business context and applies it to your fixes. It’s like having a developer who actually read the requirements AND searched through all your documentation! 📚🔍

🚀 The Git Magic

CodeHealer doesn’t just fix your code — it creates pull requests for you! It’s like having a personal assistant who’s really good at Git.

git:
  auto_commit: true
  auto_push: true
  branch_prefix: "evolve"
  commit_message_template: 'Fix {class_name}##{method_name}: {error_type}'

So when your code heals itself, you get:

✅ A new branch with a descriptive name
✅ A commit with a proper message
✅ A pull request for review
✅ Labels like “auto-fix” and “self-evolving”

It’s like having a junior developer who never forgets to follow Git best practices! 🎉

📊 The Numbers Don’t Lie

Real results from real companies:

E-commerce Platform: 15 production incidents → 3 incidents per month
Time Saved: 40 hours/month (that’s a whole work week!)
Error Resolution: 4 hours → 15 minutes
Code Quality: 23% fewer similar errors

Your boss is going to love these numbers. 📈

🎪 Coming Up Next in the Series

This is just the beginning! In the next parts, we’ll cover:

Part 3: “CodeHealer in Production: The Good, The Bad, and The Hilarious”
Part 4: “When CodeHealer Goes Rogue: Debugging the Debugger”
Part 5: “The Future is Self-Healing: What’s Coming Next”

🚀 Ready to Give Your Code a Brain?

gem install code_healer
code_healer-setup

That’s it! Your code now has a brain. And it’s smarter than most of the code I wrote in my first year of programming. 🤓

Follow this series for more laughs, more code, and more mind-blowing AI magic!

Star the repository on GitHub if you want to see where this rabbit hole leads! ⭐

Built with ❤️ and way too much coffee by Deepan Kumar