custom_functions

Complete guide for creating custom functions in CocoIndex.

Skills
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Install (Claude Code)

mkdir -p .claude/skills/custom-functions && curl -fsSL https://doutorai.pt/data/lib/skills__custom-functions.md -o .claude/skills/custom-functions/SKILL.md

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Content

# Custom Functions Reference

Complete guide for creating custom functions in CocoIndex.

## Overview

Custom functions allow creating data transformation logic that can be used within flows. There are two approaches:

1. **Standalone function** - Simple, no configuration or setup logic
2. **Function spec + executor** - Advanced, with configuration and setup logic

## Standalone Functions

Use for simple transformations that don't need configuration or setup.

### Basic Example

```python
@cocoindex.op.function(behavior_version=1)
def compute_word_count(text: str) -> int:
    """Count words in

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