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

# Save Inline to Registry

Already have a tool defined inline in a prompt? You don't need to recreate it in the registry. Save it directly with one click.

## How It Works

1. Open a prompt in the **Playground** that has an inline function tool
2. Click **Save as...** on the tool in the functions list
3. Choose a **name** and **folder** location
4. Click **Save**

The inline tool definition is saved to the registry, and the inline reference in your prompt is replaced with a registry reference automatically.

<Frame>
  <img src="https://mintcdn.com/promptlayer/et_v3mDNh4k4_HuA/images/tool-registry/save-to-registry.png?fit=max&auto=format&n=et_v3mDNh4k4_HuA&q=85&s=6bf47ab4830667303e2de00eb723f0b4" alt="Save inline tool to registry" width="1802" height="160" data-path="images/tool-registry/save-to-registry.png" />
</Frame>

## When to Use This

**Prototyping → Production workflow:**

You're iterating on a tool schema in the Playground — tweaking parameters, testing with the LLM, getting it right. Once it works, save it to the registry so other prompts can reuse it.

**Migrating existing prompts:**

You have 10 prompts that each define the same `get_weather` tool inline. Open one, save its tool to the registry, then update the other 9 to use the registry reference instead of their inline copies. Now you have one source of truth.

## What Happens After Saving

* A new tool is created in the registry with version 1
* The tool definition is frozen as the first version
* Your prompt's inline tool is replaced with a registry reference
* The prompt now resolves the tool from the registry at runtime

<Tip>
  Only inline function tools show the "Save as..." button. Built-in tools (like web search) and tool variables cannot be saved to the registry.
</Tip>