Look at this: #2143 (comment)

In your case you only need to add this in that example config.

    "e621": {
      "postprocessors": [
        {
          "name": "metadata",
          "mode": "custom",
          "format": "{description}",
          "filter": "description",
          "extension-format": "txt"
        }
      ]
    }

Full config

{
    "extractor": {
        "base-directory": "./",
        "deviantart": {
            "quality": 100,
            "directory": ["[gallery-dl]", "[{category}] {author[username]}"],
            "filename": "[{category}] {author[username]}—{index}—{date:%Y.%m.%d}—{title}.{extension}"
        },
        "twitter": {
            "retweets": "original",
            "videos": true,
            "directory": ["[gallery-dl]", "[{category}] {author[name]}"],
            "filename": "[{category}] {author[name]}—{date:%Y.%m.%d}—{retweet_id|tweet_id}—{filename}.{extension}"
        },
        "e621": {
            "directory": ["[gallery-dl]", "[{category}]"],
            "filename": "[{category}] {id}—{created_at[0:4]}.{created_at[5:7]}.{created_at[8:10]}—{tags[artist][0:3]:?/ /J /}{tags[character][0:3]:?//J /}—{filename}.{extension}",
            "postprocessors": [
                {
                    "name": "metadata",
                    "mode": "custom",
                    "format": "{description}",
                    "filter": "description",
                    "extension-format": "txt"
                }
            ]
        }
    }
}

I also added the custom filename:

"filename": "[{category}] {id}—{created_at[0:4]}.{created_at[5:7]}.{created_at[8:10]}—{tags[artist][0:3]:?/ /J /}{tags[character][0:3]:?//J /}—{filename}.{extension}"

The custom filenames include: id, date, up to 3 artist tags, up to 3 character tags, md5.

With this filenames look like:

[e621] 2951257—2021.09.29—zone ankha_(animal_crossing) bonbon_(animal_crossing) tiffany_(animal_crossing)—2a7330d20e2230870649f1179e1d9d3c.webm
[e621] 2445996—2020.10.13—personalami —27929e6775a573147a8ff6d92491d2e3.jpg
[e621] 1453137—2018.02.10—evulchibi —fc2c77adeccf3afbfd0ee3c8078e5b1f.png
[e621] 1061060—2016.11.27—joixxx —389c0732a561a49d604b669a14351f7b.jpg

Also descriptions:

[e621] 2951257—2021.09.29—zone ankha_(animal_crossing) bonbon_(animal_crossing) tiffany_(animal_crossing)—2a7330d20e2230870649f1179e1d9d3c.txt
[e621] 2445996—2020.10.13—personalami —27929e6775a573147a8ff6d92491d2e3.txt

[Feature request] [e621] download Description #2149

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