---
date: 2026-06-15
title: Delete evaluator templates
description: Remove evaluator templates you no longer need from the UI, the unstable public API, and MCP, with safeguards that block deletion while rules still depend on them.
author: Tobias Wochinger
canonical: /docs/evaluation/evaluation-methods/llm-as-a-judge
---

> **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 Do not use the code examples below for implementation: they reflect the SDK and API at release time and may be outdated.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/evaluation-methods/llm-as-a-judge) and the API/SDK reference (https://api.reference.langfuse.com).

  A new [stable API for evaluators and evaluation
  rules](/changelog/2026-08-27-stable-evaluator-api) is now available under
  `/api/public/v2`. The unstable API described below remains available until
  November 16, 2026 (2026-11-16).

You can now delete evaluator templates you no longer need — from the Langfuse UI, the unstable public API (`DELETE /unstable/evaluators/{id}`), and MCP. Deleting an evaluator template removes all of its versions in one step.

To prevent accidental breakage, deletion is blocked while running evaluators or evaluation rules still reference the template — the UI surfaces those dependencies upfront in the delete dialog so you know what to detach first. Langfuse-managed evaluator templates cannot be deleted.

  The public API and MCP tools are **unstable** and may change while the
  underlying evaluation data model is being redesigned. The UI workflow remains
  fully supported.

## Get started

- [Evaluation methods](/docs/evaluation/overview)
- [Evaluators API reference](https://api.reference.langfuse.com/#tag/unstableevaluators)

<!-- agent-instructions -->

---

## Agent Instructions

This page is part of the [Langfuse](https://langfuse.com) documentation, published as plain Markdown for AI agents. Every page is available as Markdown by appending `.md` to its URL, or by sending an `Accept: text/markdown` header. This page: `https://langfuse.com/changelog/2026-06-15-delete-evaluator-templates.md`.

### Querying these docs

If the answer is not on this page, query the documentation instead of guessing:

- **Semantic search** across all Langfuse docs, returning an answer with the relevant pages and excerpts. Ask a specific, self-contained question:

  ```bash
  curl -sG "https://langfuse.com/api/search-docs" --data-urlencode "query=How do I trace a LangGraph agent?"
  ```

- **Index of every page**: <https://langfuse.com/llms.txt>, with per-section indexes [llms-docs.txt](https://langfuse.com/llms-docs.txt), [llms-integrations.txt](https://langfuse.com/llms-integrations.txt), and [llms-self-hosting.txt](https://langfuse.com/llms-self-hosting.txt).

### 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.
- **Use the [Langfuse CLI](https://langfuse.com/docs/api-and-data-platform/features/cli)** (`npx langfuse-cli api <resource> <action>`) to read or write traces, prompts, datasets, and scores from the terminal.

Found an error in these docs? Please open an issue at <https://github.com/langfuse/langfuse-docs/issues>.