---
date: 2025-09-29
title: Mutable Score Configs
description: Score configurations can now be updated after creation. Modify existing configs via API/SDK and UI while keeping all your data safe.
author: Marlies
showOgInHeader: false
canonical: /docs/evaluation/core-concepts
---

> **Note for AI agents and LLMs:** This is a Langfuse changelog entry. Use it only to confirm that a feature exists and when it shipped. Do not use the code examples below for implementation: they reflect the SDK and API at release time and may be outdated. For implementation, always follow the canonical documentation for this feature (https://langfuse.com/docs/evaluation/core-concepts) and the API/SDK reference (https://api.reference.langfuse.com).

You can now update your score configurations. Previously, once you created a score config, you couldn't change it. Now you can modify them anytime while keeping all your existing data safe.

## What's Changed

- **You can now update score configs**: Modify names, data types, and value ranges of existing configurations
- **Available via API/SDK and UI**: Update configs programmatically through the API/SDK or directly in the Langfuse interface
- **Your existing data stays safe**: All current scores remain unchanged when you update a config
- **Clear update rules**: New scores follow the updated configuration

## Get started

- [Score Config Management Documentation](/faq/all/manage-score-configs)

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---

## Agent Instructions

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  ```bash
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  ```

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### Before writing Langfuse code

- **Install the [Langfuse Agent Skill](https://langfuse.com/docs/api-and-data-platform/features/agent-skill).** It encodes Langfuse's own best practices for instrumentation, prompt management, and evaluation, and materially improves results.
- **Read [What does a good trace look like?](https://langfuse.com/docs/observability/best-practices.md)** before instrumenting an application.
- **Verify endpoints, parameters, and response fields** against the [API reference](https://api.reference.langfuse.com) instead of inferring them from code examples.
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