> For the complete documentation index, see [llms.txt](https://docs.r.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.r.xyz/glider-ide/api/instruction/instruction.callee_names.md).

# Instruction.callee\_names()

Returns the list of function names that are called from the instruction. It returns an empty list for an instruction that does not call any functions

`callee_names() → List[str]`

For example, for the instruction:

```solidity
require(!_exists(tokenId), "ERC721: token already minted");
```

The functions will return `['_exists', 'require']`

## Query Example

```python
from glider import *


def query():
  # Fetch an instruction
  instruction = Instructions().with_callee_name('require').exec(1,30)
  
  # Print the list of function names called from the instruction
  print(instruction[0].callee_names()) 
  return instruction
```

## Example Output

<figure><img src="https://2237101709-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FDX4Ojc4j1ef51TUAtYOx%2Fuploads%2F1rV8Hjt3DiaY5Dx0K821%2Fimage.png?alt=media&amp;token=30bca455-0695-4c12-9c8e-a11862ba122e" alt=""><figcaption></figcaption></figure>