getPushDestination used git's @{push} which under push.default=simple
resolves using the local branch name as the remote branch name. since
checkout_pr uses pr-N as the local name, this resolved to origin/pr-N
instead of the actual PR branch (e.g. origin/pullfrog/feature-branch).
this caused two failure modes:
- agent passes remote branch name to push_branch → "src refspec does
not match any" because no local branch has that name
- agent calls push_branch with no args → silently pushes to a new
remote branch pr-N instead of updating the PR branch
fix: read branch.X.pushRemote and branch.X.merge from git config
directly (the exact config checkout_pr already writes) instead of
relying on @{push}. also rename head → localBranch + remoteBranch
in CheckoutPrResult to make the distinction explicit.
Co-authored-by: Cursor <cursoragent@cursor.com>
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Colin McDonnell
6a77ea6612
