Scoping the problem:

$ gh api /user/starred --paginate -q '.[].full_name' | wc -l
197
$ gh api graphql -f query=‘{ viewer { lists(first: 20) { nodes { id name slug } } } }’

197 starred repos and 12 star lists.

Testing the round-trip:

$ gh api /user/starred/lostmygithubaccount/lostmygithubaccount --method DELETE
# unstarred
$ gh api /user/starred/lostmygithubaccount/lostmygithubaccount –method PUT -H “Content-Length: 0”
re-starred

Works both ways. Here's the plan:

1. Unstar all 197 repos via DELETE /user/starred/{repo} in a loop
2. Delete all 12 star lists via GraphQL deleteUserList mutation — requires the user OAuth scope, so you'll need to run gh auth refresh -s user

$ gh api /user/starred --paginate -q '.[].full_name' | while read repo; do
    gh api /user/starred/$repo --method DELETE && echo "Unstarred: $repo"
  done
Unstarred: lostmygithubaccount/lostmygithubaccount
Unstarred: dkdc-io/dkdc.sh
Unstarred: dkdc-io/bookmarks
Unstarred: ascend-io/ascend-tools
Unstarred: dkdc-io/zorto
Unstarred: dkdc-io/db
Unstarred: dbt-labs/dbt-core
Unstarred: ibis-project/ibis
Unstarred: apache/arrow
Unstarred: pola-rs/polars
...
Unstarred: lightgbm-org/LightGBM

All 197 unstarred. Now for the star lists — I need the user OAuth scope for GraphQL mutations:

$ gh api graphql -f query='mutation { deleteUserList(input: {listId: "test"}) { clientMutationId } }'
Your token has not been granted the required scopes to execute this query.
The 'deleteUserList' field requires one of the following scopes: ['user'],
but your token has only been granted the: ['gist', 'read:org', 'repo', 'workflow'] scopes.

Run gh auth refresh -s user in your terminal — it needs a browser for the OAuth flow.

$ gh auth refresh -s user
error: --hostname required when not running interactively

Can't do it non-interactively — needs your browser. Run this in your terminal: gh auth refresh -s user

Fetching all star lists:

$ gh api graphql -f query='{ viewer { lists(first: 20) { nodes { id name } } } }' \
    -q '.data.viewer.lists.nodes[] | "\(.id) \(.name)"'
UL_kwDOA0Rnac4AHIkl Python data/ML
UL_kwDOA0Rnac4AHMAC to investigate
UL_kwDOA0Rnac4AJSk8 ops
UL_kwDOA0Rnac4AJSlF viz
UL_kwDOA0Rnac4AJSlU APIs/data sources
UL_kwDOA0Rnac4AGyXJ web9
UL_kwDOA0Rnac4AHC2H streaming
UL_kwDOA0Rnac4AJSlB dev
UL_kwDOA0Rnac4AJSli benchmarking?
UL_kwDOA0Rnac4AG5OS non-Python data/ML
UL_kwDOA0Rnac4AJSlA cool cloud-y stuff

Deleting all 11:

$ for id in UL_kwDOA0Rnac4AHIkl UL_kwDOA0Rnac4AHMAC \
    UL_kwDOA0Rnac4AJSk8 UL_kwDOA0Rnac4AJSlF \
    UL_kwDOA0Rnac4AJSlU UL_kwDOA0Rnac4AGyXJ \
    UL_kwDOA0Rnac4AHC2H UL_kwDOA0Rnac4AJSlB \
    UL_kwDOA0Rnac4AJSli UL_kwDOA0Rnac4AG5OS \
    UL_kwDOA0Rnac4AJSlA; do
  gh api graphql \
    -f query="mutation { deleteUserList(input: {listId: \"$id\"}) { clientMutationId } }"
done
{"data":{"deleteUserList":{"clientMutationId":null}}}
{"data":{"deleteUserList":{"clientMutationId":null}}}
{"data":{"deleteUserList":{"clientMutationId":null}}}
{"data":{"deleteUserList":{"clientMutationId":null}}}
{"data":{"deleteUserList":{"clientMutationId":null}}}
{"data":{"deleteUserList":{"clientMutationId":null}}}
{"data":{"deleteUserList":{"clientMutationId":null}}}
{"data":{"deleteUserList":{"clientMutationId":null}}}
{"data":{"deleteUserList":{"clientMutationId":null}}}
{"data":{"deleteUserList":{"clientMutationId":null}}}
{"data":{"deleteUserList":{"clientMutationId":null}}}

Verifying:

$ gh api /user/starred --paginate -q '.[].full_name' | wc -l
0
$ gh api graphql -f query=‘{ viewer { lists(first: 20) { nodes { id name } } } }’ 

-q ‘.data.viewer.lists.nodes | length’
0