diff --git a/.github/workflows/bumpgen-core.yml b/.github/workflows/bumpgen-core.yml
new file mode 100644
index 0000000..0dab179
--- /dev/null
+++ b/.github/workflows/bumpgen-core.yml
@@ -0,0 +1,26 @@
+name: "Bumpgen (core)"
+
+on:
+  pull_request:
+    types:
+      - opened
+      - labeled
+
+permissions:
+  pull-requests: read
+
+jobs:
+  main:
+    name: Run Bumpgen
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' || contains( github.event.pull_request.labels.*.name, 'run bumpgen') }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup
+        uses: ./tooling/github/setup
+      - name: Bumpgen
+        uses: ./
+        with:
+          path: "./packages/bumpgen-core/"
+          llm_key: ${{ secrets.LLM_API_KEY }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/action.yml b/action.yml
new file mode 100644
index 0000000..226b469
--- /dev/null
+++ b/action.yml
@@ -0,0 +1,51 @@
+name: "bumpgen"
+description: "handle breaking changes from dependency upgrades"
+author: Xeol <xeol.io>
+
+inputs:
+  path:
+    description: Repository path
+    required: false
+    default: "./"
+  llm_key:
+    description: "LLM API key"
+    required: true
+  github_token:
+    description: "GitHub token"
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - shell: bash
+      env:
+        LLM_API_KEY: ${{ inputs.llm_key }}
+      run: |
+        npm install -g bumpgen
+        bumpgen --simple --dir ${{ inputs.path }} --no-upgrade --auto-detect
+    - shell: bash
+      name: Configure Git
+      run: |
+        git config user.name "github-actions[bot]"
+        git config user.email "github-actions[bot]@users.noreply.github.com"
+    - shell: bash
+      name: Check for changes and commit
+      id: commit_changes
+      env:
+        GITHUB_TOKEN: ${{ inputs.github_token }}
+      run: |
+        git add -u
+        if ! git diff-index --quiet HEAD; then
+          git commit -m "chore: run bumpgen"
+          echo "::set-output name=changes_detected::true"
+        else
+          echo "No changes to commit"
+          echo "::set-output name=changes_detected::false"
+        fi
+
+    - name: Push changes
+      if: steps.commit_changes.outputs.changes_detected == 'true'
+      uses: ad-m/github-push-action@master
+      with:
+        github_token: ${{ inputs.github_token }}
+        branch: ${{ github.ref }}
diff --git a/apps/cli/src/index.tsx b/apps/cli/src/index.tsx
index f40a4c5..747eafb 100644
--- a/apps/cli/src/index.tsx
+++ b/apps/cli/src/index.tsx
@@ -78,7 +78,9 @@ const available = await bumpFinder.list();
 
 if (!pkg) {
   if (autoDetect) {
-    const detected = await bumpFinder.detect();
+    const detected = await bumpFinder.detect(
+      autoDetect === true ? undefined : autoDetect,
+    );
 
     if (detected.length > 0) {
       if (detected.length > 1) {
diff --git a/packages/bumpgen-core/src/services/git/index.ts b/packages/bumpgen-core/src/services/git/index.ts
index 145918c..604d9c9 100644
--- a/packages/bumpgen-core/src/services/git/index.ts
+++ b/packages/bumpgen-core/src/services/git/index.ts
@@ -12,7 +12,7 @@ export const createGitService = (
     raw: git,
     getMainBranch: async (cwd: string) => {
       await git.cwd(cwd);
-      return (
+      const mainBranch = (
         await subprocess.exec(
           "git symbolic-ref refs/remotes/origin/HEAD | sed 's@^refs/remotes/origin/@@'",
           {
@@ -20,6 +20,12 @@ export const createGitService = (
           },
         )
       ).trim();
+
+      if (!mainBranch) {
+        return null;
+      }
+
+      return mainBranch;
     },
   };
 };