---
title: "Changes to (dev only) Fabricate failing eval runs and fire the real eval.failed emitter"
method: POST
path: "/v1/evals/synthesize-failure"
---

# Changes to (dev only) Fabricate failing eval runs and fire the real eval.failed emitter

`POST /v1/evals/synthesize-failure`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 1 of 3 revisions.

- **2026-08-12** `5a5597ebb2d6` — 4 info

## Changes

- **2026-08-12** `5a5597ebb2d6` — 4 info
  - added the optional property `retry_after` to the response with the `400` status
  - added the optional property `retry_after` to the response with the `401` status
  - added the optional property `retryable` to the response with the `400` status
  - added the optional property `retryable` to the response with the `401` status

---

[Operation](https://skmtc.dev/oneloop-hq/apis/feather-api/docs/v1/evals/synthesize-failure/post.md) · [API](https://skmtc.dev/oneloop-hq/apis/feather-api.md) · [Page](https://skmtc.dev/oneloop-hq/apis/feather-api/changes/v1/evals/synthesize-failure/post)