actions/github-script "HttpError: Not Found" from the wrong repo context

github-script throws "HttpError: Not Found" when the REST call resolves to a repo, owner, or resource the token can see but that does not contain the thing you asked for. The credentials are valid; the address is wrong.

What this error means

A github-script step fails with "Error: HttpError: Not Found" even though the token has access to the workflow repo.

github-actions

RequestError [HttpError]: Not Found
    at /home/runner/work/_actions/actions/github-script/v7/dist/index.js
    status: 404
##[error]Unhandled error: HttpError: Not Found

Common causes

Hardcoded owner/repo that differs from context

The script passes a literal owner or repo that does not match where the resource lives, so the API resolves a 404.

Resource id from a different repository

An issue, PR, or run number from another repo is queried against context.repo, which does not contain it.

Reusing context.repo in a cross-repo call

context.repo always points at the workflow repo; cross-repo calls must set owner and repo explicitly.

How to fix it

Pass owner and repo from context explicitly

Destructure owner and repo from context.repo for same-repo calls.
For cross-repo calls, set owner and repo to the target repository literally.
Re-run and confirm the resource resolves.

.github/workflows/script.yml

- uses: actions/github-script@v7
  with:
    script: |
      const { data } = await github.rest.issues.get({
        owner: context.repo.owner,
        repo: context.repo.repo,
        issue_number: context.issue.number,
      });
      core.info(data.title);

How to prevent it

Never hardcode owner/repo when context.repo will do.
Log owner/repo/number before the call so a 404 points at the address, not the auth.