docs: enhance preview workflow with direct links to changed pages

fern/products/docs/pages/changelog/2026-01-30.mdx

@@ -0,0 +1,7 @@
+## Direct links to changed pages in preview comments
+
+The GitHub Actions workflow for preview links now includes direct links to the specific pages you've modified. When a PR is opened, the preview comment lists each changed MDX file with a clickable link to its preview URL.
+
+This makes it easier for reviewers to jump directly to the pages that were updated rather than navigating through the entire preview site.
+
+Learn more about [automating preview links with GitHub Actions](/learn/docs/preview-publish/preview-changes#automate-with-github-actions).

fern/products/docs/pages/getting-started/preview-changes-locally.mdx

@@ -5,8 +5,8 @@ description: Learn how to preview documentation changes with Fern using local de
 
 Fern offers two ways to preview documentation changes:
 
-- **[Local development](#local-development)**: Fast iteration with hot reload, best for active development
-- **[Preview links](#preview-links)**: Shareable URLs for reviews and collaboration
+- [**Local development**](#local-development): Fast iteration with hot reload, best for active development
+- [**Preview links**](#preview-links): Shareable URLs for reviews and collaboration
 
 <Info title="Prerequisites">
 Install the following:
@@ -81,6 +81,46 @@ jobs:
           echo "$OUTPUT"
           URL=$(echo "$OUTPUT" | grep -oP 'Published docs to \K.*(?= \()')
           echo "🌿 Preview your docs: $URL" > preview_url.txt
+          echo "preview_url=$URL" >> $GITHUB_OUTPUT
+          echo "Preview URL: $URL"
+
+      - name: Get page links for changed MDX files
+        id: page-links
+        env:
+          FERN_TOKEN: ${{ secrets.FERN_TOKEN }}
+        run: |
+          PREVIEW_URL="${{ steps.generate-docs.outputs.preview_url }}"
+          CHANGED_FILES=$(git diff --name-only origin/main...HEAD -- '*.mdx' 2>/dev/null || echo "")
+
+          if [ -z "$CHANGED_FILES" ] || [ -z "$PREVIEW_URL" ]; then
+            echo "page_links=" >> $GITHUB_OUTPUT; exit 0
+          fi
+
+          BASE_URL=$(echo "$PREVIEW_URL" | grep -oP 'https?://[^/]+')
+
+          FILES_PARAM=$(echo "$CHANGED_FILES" | tr '\n' ',' | sed 's/,$//')
+          RESPONSE=$(curl -sf -H "FERN_TOKEN: $FERN_TOKEN" "${PREVIEW_URL}/api/fern-docs/get-slug-for-file?files=${FILES_PARAM}" 2>/dev/null) || {
+            echo "page_links=" >> $GITHUB_OUTPUT; exit 0
+          }
+
+          PAGE_LINKS=$(echo "$RESPONSE" | jq -r --arg url "$BASE_URL" \
+            '.mappings[] | select(.slug != null) | "- [\(.slug)](\($url)/\(.slug))"')
+
+          if [ -n "$PAGE_LINKS" ]; then
+            { echo "page_links<<EOF"; echo "$PAGE_LINKS"; echo "EOF"; } >> $GITHUB_OUTPUT
+          else
+            echo "page_links=" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Create comment content
+        run: |
+          echo ":herb: **Preview your docs:** <${{ steps.generate-docs.outputs.preview_url }}>" > preview_url.txt
+
+          if [ -n "${{ steps.page-links.outputs.page_links }}" ]; then
+            echo "" >> preview_url.txt
+            echo "Here are the markdown pages you've updated:" >> preview_url.txt
+            echo "${{ steps.page-links.outputs.page_links }}" >> preview_url.txt
+          fi
 
       - name: Comment URL in PR
         uses: thollander/actions-comment-pull-request@v2.4.3
@@ -128,6 +168,46 @@ jobs:
           echo "$OUTPUT"
           URL=$(echo "$OUTPUT" | grep -oP 'Published docs to \K.*(?= \()')
           echo "🌿 Preview your docs: $URL" > preview_url.txt
+          echo "preview_url=$URL" >> $GITHUB_OUTPUT
+          echo "Preview URL: $URL"
+
+      - name: Get page links for changed MDX files
+        id: page-links
+        env:
+          FERN_TOKEN: ${{ secrets.FERN_TOKEN }}
+        run: |
+          PREVIEW_URL="${{ steps.generate-docs.outputs.preview_url }}"
+          CHANGED_FILES=$(git diff --name-only origin/main...HEAD -- '*.mdx' 2>/dev/null || echo "")
+
+          if [ -z "$CHANGED_FILES" ] || [ -z "$PREVIEW_URL" ]; then
+            echo "page_links=" >> $GITHUB_OUTPUT; exit 0
+          fi
+
+          BASE_URL=$(echo "$PREVIEW_URL" | grep -oP 'https?://[^/]+')
+
+          FILES_PARAM=$(echo "$CHANGED_FILES" | tr '\n' ',' | sed 's/,$//')
+          RESPONSE=$(curl -sf -H "FERN_TOKEN: $FERN_TOKEN" "${PREVIEW_URL}/api/fern-docs/get-slug-for-file?files=${FILES_PARAM}" 2>/dev/null) || {
+            echo "page_links=" >> $GITHUB_OUTPUT; exit 0
+          }
+
+          PAGE_LINKS=$(echo "$RESPONSE" | jq -r --arg url "$BASE_URL" \
+            '.mappings[] | select(.slug != null) | "- [\(.slug)](\($url)/\(.slug))"')
+
+          if [ -n "$PAGE_LINKS" ]; then
+            { echo "page_links<<EOF"; echo "$PAGE_LINKS"; echo "EOF"; } >> $GITHUB_OUTPUT
+          else
+            echo "page_links=" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Create comment content
+        run: |
+          echo ":herb: **Preview your docs:** <${{ steps.generate-docs.outputs.preview_url }}>" > preview_url.txt
+
+          if [ -n "${{ steps.page-links.outputs.page_links }}" ]; then
+            echo "" >> preview_url.txt
+            echo "Here are the markdown pages you've updated:" >> preview_url.txt
+            echo "${{ steps.page-links.outputs.page_links }}" >> preview_url.txt
+          fi
 
       - name: Comment URL in PR
         uses: thollander/actions-comment-pull-request@v2.4.3
@@ -136,4 +216,4 @@ jobs:
 ```
 </CodeBlock>
 
-</Accordion>
+</Accordion>