> ## Documentation Index
> Fetch the complete documentation index at: https://guides.robylon.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Dev Components

> Dev components bring development and engineering flexibility into workflows. They allow you to call APIs, run Python functions, connect integrations, and annotate workflows with notes.

### API

The **API block** sets up external API calls inside workflows.

* Pulls or pushes data to a client’s database or third-party service.
* Can be invoked directly or by an **AI agent** when additional context is required.
* Example uses:
  * Check a **user’s subscription status**
  * Retrieve **order details** from an ERP
  * Update a **ticket property** in a helpdesk system

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### Function

The **Function block** allows embedding custom Python code.

* Accepts **specific inputs** and returns **structured outputs**.
* Highly versatile for validation, transformation, or computation.
* Example uses:
  * Validate **transaction hashes**
  * Check if a **URL is valid**
  * Normalize data (e.g., phone numbers, dates)

<Tip>
  Keep functions **small and modular**. Promote frequently used logic into a **Tool** for reuse across workflows.
</Tip>

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### Integration

The **Integration block** connects to third-party apps and fetches structured data.

* Common integrations: **Google Sheets**, **CRMs**, **Payment processors**
* Example uses:
  * Read/write rows in a Google Sheet
  * Pull customer info from Salesforce
  * Fetch product catalog data from Shopify

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### Notes

The **Notes block** adds inline documentation to a workflow.

* Helps explain **why a step exists** or what a **condition means**.
* Improves collaboration by making workflows easier to audit and maintain.
* Notes are **non-executable** and purely for context.

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