[BUG] Claude code places methods in the wrong code-block in large files.

Resolved 💬 3 comments Opened Jun 23, 2025 by petered Closed Jan 4, 2026

Environment

  • Platform (select one): Anthropic API
  • Claude CLI version: 1.0.31 (Claude Code)
  • Operating System: Macos 14.7
  • Terminal: Android Studio terminal

Bug Description

In short - Claude sometimes accidentally adds new methods to the wrong class.

Detail: I'm making an Android app, and I've got the classic "Android Burrito" going on (a 2600 line MainActivity.kt). Yes, not great practice, but it happens. The structure is

// imports 

class MainActivity : AppCompatActivity() {
  // A huge wad of code
}

...

fun IDrone.getLatestLaserMeasureInfo(maxAgeMillis: Int = 5000): Result<LaserMeasureInformation_> {
  // Function body
}

Claude tries to add some methods (onPause(), onResume()) to MainActivity, but they end up being added to the IDrone... block instead, causing compile errors.

ie, I get

// imports 

class MainActivity : AppCompatActivity() {
  // A huge wad of code

  // onResume SHOULD HAVE BEEN PUT HERE
}

...

fun IDrone.getLatestLaserMeasureInfo(maxAgeMillis: Int = 5000): Result<LaserMeasureInformation_> {
   // Function body 

  override fun onResume() { // SHOULD NOT HAVE BEEN PUT HERE
      ...
  }
}

Yes it's kind of my fault for stuffing so many things in one file - but it would help for claude to have access to some sort of "append method to class" functionality to avoid this mistake.

I've had this happen a few times now.

Steps to Reproduce

  1. Make Giant class
  2. Make another class or function in the same file after it
  3. Ask claude to add method to giant class
  4. See that claude tries to add it to second class/function in same file instead

Expected Behavior

Method is added to giant class

Actual Behavior

Method gets added to wrong class - resulting in compile errors because method tries to reference properties of giant claass.

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