---
title: "Update DAG spec"
method: PUT
path: "/dags/{fileName}/spec"
tags: ["dags"]
---

# Update DAG spec

`PUT /dags/{fileName}/spec`

Modifies the YAML specification of a DAG definition

## Path parameters

- `fileName` string, regex, required — Name of the DAG file

## Query parameters

- `remoteNode` string

## Request body

- object
  - `spec` string, required — The new DAG spec in YAML format

## Response `200`

A successful response

- object
  - `errors` string[], required — List of errors in the spec

## Other responses

- `default` — Generic error response

## Changes

- **2026-05-24** (v1) `8a2d5d3e9608` — 1 warning
  - added the new `rate_limited` enum value to the `code` response property for the response status `default`
- **2026-04-30** (v1) `50e1d517afc1` — 1 info
  - removed the `rate_limited` enum value from the `code` response property for the response status `default`

[Change history](https://skmtc.dev/dagucloud/apis/dagu/changes/dags/:fileName/spec/put.md)

---

[API](https://skmtc.dev/dagucloud/apis/dagu.md) · [All operations](https://skmtc.dev/dagucloud/apis/dagu/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/dagucloud/dagu/revisions/8a2d5d3e9608/schema)