diff --git a/.github/workflows/danger-workflow-tests.yml b/.github/workflows/danger-workflow-tests.yml
new file mode 100644
index 0000000..0b27a3a
--- /dev/null
+++ b/.github/workflows/danger-workflow-tests.yml
@@ -0,0 +1,18 @@
+# This isn't a reusable workflow but an actual CI action for this repo itself - to test the workflows.
+name: Danger Workflow Tests
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, edited, ready_for_review]
+
+jobs:
+  danger:
+    uses: ./.github/workflows/danger.yml
+    with:
+      _workflow_version: ${{ github.sha }}
+
+  test-outputs:
+    runs-on: ubuntu-latest
+    needs: danger
+    steps:
+      - run: "[[ '${{ needs.danger.outputs.outcome }}' == 'success' ]]"
diff --git a/.github/workflows/danger.yml b/.github/workflows/danger.yml
new file mode 100644
index 0000000..d2aa447
--- /dev/null
+++ b/.github/workflows/danger.yml
@@ -0,0 +1,41 @@
+# Runs DangerJS with a pre-configured set of rules on a Pull Request.
+on:
+  workflow_call:
+    inputs:
+      _workflow_version:
+        description: 'Internal: specify github-workflows (this repo) revision to use when checking out scripts.'
+        type: string
+        required: false
+        default: v2  # Note: update when publishing a new version
+    outputs:
+      outcome:
+        description: Whether the Danger run finished successfully. Possible values are success, failure, cancelled, or skipped.
+        value: ${{ jobs.danger.outputs.outcome }}
+
+jobs:
+  danger:
+    runs-on: ubuntu-latest
+    outputs:
+      outcome: ${{ steps.danger.outcome }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Download dangerfile.js
+        run: wget https://raw.githubusercontent.com/getsentry/github-workflows/${{ inputs._workflow_version }}/danger/dangerfile.js -P ${{ runner.temp }}
+
+      # Using a pre-built docker image in GitHub container registry instaed of NPM to reduce possible attack vectors.
+      - name: Run DangerJS
+        id: danger
+        run: |
+          docker run \
+            --volume ${{ github.workspace }}:/github/workspace \
+            --volume ${{ runner.temp }}:${{ runner.temp }} \
+            --workdir /github/workspace \
+            --user $UID \
+            -e "INPUT_ARGS" -e "GITHUB_JOB" -e "GITHUB_REF" -e "GITHUB_SHA" -e "GITHUB_REPOSITORY" -e "GITHUB_REPOSITORY_OWNER" -e "GITHUB_RUN_ID" -e "GITHUB_RUN_NUMBER" -e "GITHUB_RETENTION_DAYS" -e "GITHUB_RUN_ATTEMPT" -e "GITHUB_ACTOR" -e "GITHUB_TRIGGERING_ACTOR" -e "GITHUB_WORKFLOW" -e "GITHUB_HEAD_REF" -e "GITHUB_BASE_REF" -e "GITHUB_EVENT_NAME" -e "GITHUB_SERVER_URL" -e "GITHUB_API_URL" -e "GITHUB_GRAPHQL_URL" -e "GITHUB_REF_NAME" -e "GITHUB_REF_PROTECTED" -e "GITHUB_REF_TYPE" -e "GITHUB_WORKSPACE" -e "GITHUB_ACTION" -e "GITHUB_EVENT_PATH" -e "GITHUB_ACTION_REPOSITORY" -e "GITHUB_ACTION_REF" -e "GITHUB_PATH" -e "GITHUB_ENV" -e "GITHUB_STEP_SUMMARY" -e "RUNNER_OS" -e "RUNNER_ARCH" -e "RUNNER_NAME" -e "RUNNER_TOOL_CACHE" -e "RUNNER_TEMP" -e "RUNNER_WORKSPACE" -e "ACTIONS_RUNTIME_URL" -e "ACTIONS_RUNTIME_TOKEN" -e "ACTIONS_CACHE_URL" -e GITHUB_ACTIONS=true -e CI=true \
+            -e GITHUB_TOKEN="${{ github.token }}" \
+            -e DANGER_DISABLE_TRANSPILATION="true" \
+            ghcr.io/danger/danger-js:11.1.2 \
+            --failOnErrors --dangerfile ${{ runner.temp }}/dangerfile.js
diff --git a/.github/workflows/updater-scripts-tests.yml b/.github/workflows/updater-scripts-tests.yml
index 70d0737..854751a 100644
--- a/.github/workflows/updater-scripts-tests.yml
+++ b/.github/workflows/updater-scripts-tests.yml
@@ -1,5 +1,5 @@
 # This isn't a reusable workflow but an actual CI action for this repo itself - to test scripts.
-name: Script Tests
+name: Updater Script Tests
 
 on:
   push:
diff --git a/.github/workflows/updater-workflow-tests.yml b/.github/workflows/updater-workflow-tests.yml
index a416b0f..675a6a1 100644
--- a/.github/workflows/updater-workflow-tests.yml
+++ b/.github/workflows/updater-workflow-tests.yml
@@ -1,5 +1,5 @@
 # This isn't a reusable workflow but an actual CI action for this repo itself - to test the workflows.
-name: Workflow Tests
+name: Updater Workflow Tests
 
 on:
   push:
diff --git a/.github/workflows/versioning.yml b/.github/workflows/versioning.yml
index ba8f779..41f86d4 100644
--- a/.github/workflows/versioning.yml
+++ b/.github/workflows/versioning.yml
@@ -1,4 +1,4 @@
-name: Keep the major version tags up-to-date
+name: Sync tags with releases
 
 on:
   release:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c025b5..82ba5f3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 ## Unreleased
 
+## 2.1.0
+
+### Features
+
+- New reusable workflow, `danger.yml`, to check Pull Requests with predefined rules ([#34](https://github.com/getsentry/github-workflows/pull/34))
+
 ## 2.0.0
 
 ### Changes
diff --git a/README.md b/README.md
index 55e0a17..591a4c5 100644
--- a/README.md
+++ b/README.md
@@ -77,4 +77,20 @@ jobs:
 
 * `api-token`: GH authentication token to create PRs with & push.
   If you provide the usual `${{ github.token }}`, no followup CI will run on the created PR.
-  If you want CI to run on the PRs created by the Updater, you need to provide custom user-specific auth token.
\ No newline at end of file
+  If you want CI to run on the PRs created by the Updater, you need to provide custom user-specific auth token.
+
+## Danger
+
+Runs DangerJS on Pull Reqeusts in your repository. This uses custom set of rules defined in [this dangerfile](danger/dangerfile.js).
+
+```yaml
+name: Danger
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, edited, ready_for_review]
+
+jobs:
+  danger:
+    uses: getsentry/github-workflows/.github/workflows/danger.yml@v2
+```
diff --git a/danger/dangerfile.js b/danger/dangerfile.js
new file mode 100644
index 0000000..9e01a69
--- /dev/null
+++ b/danger/dangerfile.js
@@ -0,0 +1,91 @@
+// e.g. "feat" if PR title is "Feat : add more useful stuff"
+// or  "ci" if PR branch is "ci/update-danger"
+function getPrFlavor() {
+  if (danger.github && danger.github.pr) {
+    var separator = undefined;
+    if (danger.github.pr.title) {
+      const parts = danger.github.pr.title.split(":");
+      if (parts.length > 1) {
+        return parts[0].toLowerCase().trim();
+      }
+    }
+    if (danger.github.pr.head && danger.github.pr.head.ref) {
+      const parts = danger.github.pr.head.ref.split("/");
+      if (parts.length > 1) {
+        return parts[0].toLowerCase();
+      }
+    }
+  }
+  return "";
+}
+
+async function checkDocs() {
+  if (getPrFlavor().startsWith("feat")) {
+    message(
+      'Do not forget to update <a href="https://github.com/getsentry/sentry-docs">Sentry-docs</a> with your feature once the pull request gets approved.'
+    );
+  }
+}
+
+async function checkChangelog() {
+  const changelogFile = "CHANGELOG.md";
+
+  // Check if skipped
+  if (danger.github && danger.github.pr) {
+    if (
+      ["ci", "chore(deps)"].includes(getPrFlavor()) ||
+      (danger.github.pr.body + "").includes("#skip-changelog")
+    ) {
+      return;
+    }
+  }
+
+  // Check if current PR has an entry in changelog
+  const changelogContents = await danger.github.utils.fileContents(
+    changelogFile
+  );
+
+  const hasChangelogEntry = RegExp(`#${danger.github.pr.number}\\b`).test(
+    changelogContents
+  );
+
+  if (hasChangelogEntry) {
+    return;
+  }
+
+  // Report missing changelog entry
+  fail(
+    "Please consider adding a changelog entry for the next release.",
+    changelogFile
+  );
+
+  const prTitleFormatted = danger.github.pr.title
+    .split(": ")
+    .slice(-1)[0]
+    .trim()
+    .replace(/\.+$/, "");
+
+  markdown(
+    `
+### Instructions and example for changelog
+
+Please add an entry to \`CHANGELOG.md\` to the "Unreleased" section. Make sure the entry includes this PR's number.
+
+Example:
+
+\`\`\`markdown
+## Unreleased
+
+- ${prTitleFormatted} ([#${danger.github.pr.number}](${danger.github.pr.html_url}))
+\`\`\`
+
+If none of the above apply, you can opt out of this check by adding \`#skip-changelog\` to the PR description.`.trim()
+  );
+}
+
+async function checkAll() {
+  await checkDocs();
+  await checkChangelog();
+}
+
+schedule(checkAll);