diff --git a/.github/workflows/dco-welcome-reusable.yml b/.github/workflows/dco-welcome-reusable.yml
new file mode 100644
index 0000000..5b77915
--- /dev/null
+++ b/.github/workflows/dco-welcome-reusable.yml
@@ -0,0 +1,58 @@
+name: DCO Assistant for First-Time Contributors
+
+on:
+  # Make this a reusable workflow as described in
+  # https://docs.github.com/en/actions/how-tos/reuse-automations/reuse-workflows
+  workflow_call:
+
+jobs:
+  dco-help:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: write
+      pull-requests: write
+    if: |
+      github.event.check_run.conclusion == 'failure' &&
+      contains(github.event.check_run.name, 'DCO') &&
+      github.event.check_run.pull_requests[0] != null
+    steps:
+      - name: Load PR Context
+        id: pr-context
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const prs = context.payload.check_run.pull_requests || [];
+            if (prs.length === 0) {
+              core.setOutput('should_comment', 'false');
+              return;
+            }
+
+            const prNumber = prs[0].number;
+            const { data: pr } = await github.rest.pulls.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: prNumber,
+            });
+
+            const shouldComment = ['FIRST_TIME_CONTRIBUTOR', 'NONE'].includes(pr.author_association);
+            core.setOutput('pr_number', String(prNumber));
+            core.setOutput('should_comment', shouldComment ? 'true' : 'false');
+
+      - name: Post DCO Instructions
+        if: steps.pr-context.outputs.should_comment == 'true'
+        uses: peter-evans/create-or-update-comment@v3
+        with:
+          issue-number: ${{ steps.pr-context.outputs.pr_number }}
+          body: |
+            Welcome to the project, @${{ github.actor }}!
+
+            It looks like this is your first contribution. We noticed the **DCO (Developer Certificate of Origin)** check might fail if your commits aren't signed.
+
+            To fix this, please ensure every commit has a `Signed-off-by: Name <email>` line. You can do this automatically by using the `-s` flag:
+            `git commit -s -m "Your message"`
+
+            For existing commits, you can fix them with:
+            `git commit --amend --signoff` or `git rebase -i HEAD~N --signoff` (where N is the number of commits)
+            The Developer Community DCO guide also provides helpful tips on fixing DCO inconveniences. Setting a commit hook in the git repository will automate adding the DCO signoff.
+            See https://github.com/p4lang/governance/wiki/P4-DCO-Guidelines for information.
diff --git a/.github/workflows/dco-welcome.yml b/.github/workflows/dco-welcome.yml
new file mode 100644
index 0000000..fb75a8e
--- /dev/null
+++ b/.github/workflows/dco-welcome.yml
@@ -0,0 +1,9 @@
+name: DCO Assistant for First-Time Contributors
+
+on:
+  check_run:
+    types: [completed]
+
+jobs:
+  dco-help:
+    uses: p4lang/.github/.github/workflows/dco-welcome-reusable.yml@main