diff --git a/EXAMPLE_WORKFLOW.yml b/EXAMPLE_WORKFLOW.yml
new file mode 100644
index 0000000000..8db261b07c
--- /dev/null
+++ b/EXAMPLE_WORKFLOW.yml
@@ -0,0 +1,89 @@
+# Example workflow demonstrating the new feature from Issue #4111
+# This workflow shows how PR title and body are automatically defaulted from commit message
+
+name: Example - Auto PR Title/Body
+
+on:
+  workflow_dispatch:
+
+jobs:
+  create-pr-with-auto-defaults:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      # Make some changes
+      - name: Update files
+        run: |
+          echo "Updated content" > example.txt
+          date > timestamp.txt
+
+      # Create PR with automatic title/body from commit
+      # The PR will have:
+      #   Title: "Update AGP sources to the latest"
+      #   Body: "_Auto-generated by `dump-sources` Github workflow._"
+      - name: Create Pull Request (Auto Title/Body)
+        uses: peter-evans/create-pull-request@v7
+        with:
+          commit-message: |
+            Update AGP sources to the latest
+
+            _Auto-generated by `dump-sources` Github workflow._
+          branch: actions/dump-sources
+          delete-branch: true
+          # Note: title and body are NOT specified, so they will be
+          # automatically set from the commit message above
+
+  create-pr-with-custom-values:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      # Make some changes
+      - name: Update files
+        run: |
+          echo "Updated content" > example.txt
+
+      # Create PR with custom title/body (overrides auto-default)
+      # The PR will have the custom values below, NOT the commit message
+      - name: Create Pull Request (Custom Title/Body)
+        uses: peter-evans/create-pull-request@v7
+        with:
+          commit-message: |
+            Update AGP sources to the latest
+
+            _Auto-generated by `dump-sources` Github workflow._
+          title: Custom PR Title
+          body: Custom PR Description
+          branch: actions/custom-pr
+          delete-branch: true
+
+  create-pr-multiple-commits:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      # Make multiple commits
+      - name: Create multiple commits
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          
+          echo "First change" > file1.txt
+          git add file1.txt
+          git commit -m "First commit"
+          
+          echo "Second change" > file2.txt
+          git add file2.txt
+          git commit -m "Second commit"
+
+      # Create PR - will use default title/body since there are multiple commits
+      # The PR will have:
+      #   Title: "Changes by create-pull-request action"
+      #   Body: "Automated changes by [create-pull-request](...) GitHub action"
+      - name: Create Pull Request (Multiple Commits)
+        uses: peter-evans/create-pull-request@v7
+        with:
+          branch: actions/multiple-commits
+          delete-branch: true
+          # Note: Multiple commits means auto-default doesn't apply
diff --git a/__test__/create-pull-request.unit.test.ts b/__test__/create-pull-request.unit.test.ts
new file mode 100644
index 0000000000..5e16ed197b
--- /dev/null
+++ b/__test__/create-pull-request.unit.test.ts
@@ -0,0 +1,218 @@
+import {Commit} from '../lib/git-command-manager'
+
+describe('create-pull-request PR title and body defaulting', () => {
+  const defaultTitle = 'Changes by create-pull-request action'
+  const defaultBody =
+    'Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action'
+
+  test('should use commit subject as title for single commit when title is default', () => {
+    const commit: Commit = {
+      sha: 'abc123',
+      tree: 'tree123',
+      parents: ['parent123'],
+      signed: false,
+      subject: 'Update AGP sources to the latest',
+      body: '_Auto-generated by `dump-sources` Github workflow._',
+      changes: [],
+      unparsedChanges: []
+    }
+
+    const branchCommits = [commit]
+    let title = defaultTitle
+    let body = defaultBody
+
+    // Simulate the logic from create-pull-request.ts
+    if (branchCommits.length === 1) {
+      const singleCommit = branchCommits[0]
+      if (title === defaultTitle) {
+        title = singleCommit.subject
+      }
+      if (body === defaultBody) {
+        if (singleCommit.body && singleCommit.body.trim().length > 0) {
+          body = singleCommit.body
+        }
+      }
+    }
+
+    expect(title).toEqual('Update AGP sources to the latest')
+    expect(body).toEqual('_Auto-generated by `dump-sources` Github workflow._')
+  })
+
+  test('should not override custom title and body', () => {
+    const commit: Commit = {
+      sha: 'abc123',
+      tree: 'tree123',
+      parents: ['parent123'],
+      signed: false,
+      subject: 'Update AGP sources to the latest',
+      body: '_Auto-generated by `dump-sources` Github workflow._',
+      changes: [],
+      unparsedChanges: []
+    }
+
+    const branchCommits = [commit]
+    let title = 'Custom Title'
+    let body = 'Custom Body'
+
+    // Simulate the logic from create-pull-request.ts
+    if (branchCommits.length === 1) {
+      const singleCommit = branchCommits[0]
+      if (title === defaultTitle) {
+        title = singleCommit.subject
+      }
+      if (body === defaultBody) {
+        if (singleCommit.body && singleCommit.body.trim().length > 0) {
+          body = singleCommit.body
+        }
+      }
+    }
+
+    expect(title).toEqual('Custom Title')
+    expect(body).toEqual('Custom Body')
+  })
+
+  test('should not default for multiple commits', () => {
+    const commit1: Commit = {
+      sha: 'abc123',
+      tree: 'tree123',
+      parents: ['parent123'],
+      signed: false,
+      subject: 'First commit',
+      body: 'First commit body',
+      changes: [],
+      unparsedChanges: []
+    }
+
+    const commit2: Commit = {
+      sha: 'def456',
+      tree: 'tree456',
+      parents: ['abc123'],
+      signed: false,
+      subject: 'Second commit',
+      body: 'Second commit body',
+      changes: [],
+      unparsedChanges: []
+    }
+
+    const branchCommits = [commit1, commit2]
+    let title = defaultTitle
+    let body = defaultBody
+
+    // Simulate the logic from create-pull-request.ts
+    if (branchCommits.length === 1) {
+      const singleCommit = branchCommits[0]
+      if (title === defaultTitle) {
+        title = singleCommit.subject
+      }
+      if (body === defaultBody) {
+        if (singleCommit.body && singleCommit.body.trim().length > 0) {
+          body = singleCommit.body
+        }
+      }
+    }
+
+    expect(title).toEqual(defaultTitle)
+    expect(body).toEqual(defaultBody)
+  })
+
+  test('should handle commit with empty body', () => {
+    const commit: Commit = {
+      sha: 'abc123',
+      tree: 'tree123',
+      parents: ['parent123'],
+      signed: false,
+      subject: 'Update files',
+      body: '',
+      changes: [],
+      unparsedChanges: []
+    }
+
+    const branchCommits = [commit]
+    let title = defaultTitle
+    let body = defaultBody
+
+    // Simulate the logic from create-pull-request.ts
+    if (branchCommits.length === 1) {
+      const singleCommit = branchCommits[0]
+      if (title === defaultTitle) {
+        title = singleCommit.subject
+      }
+      if (body === defaultBody) {
+        if (singleCommit.body && singleCommit.body.trim().length > 0) {
+          body = singleCommit.body
+        }
+      }
+    }
+
+    expect(title).toEqual('Update files')
+    expect(body).toEqual(defaultBody) // Should keep default when commit body is empty
+  })
+
+  test('should handle commit with multi-line body', () => {
+    const commit: Commit = {
+      sha: 'abc123',
+      tree: 'tree123',
+      parents: ['parent123'],
+      signed: false,
+      subject: 'Update documentation',
+      body: 'This is a detailed commit message.\n\nIt has multiple paragraphs.\n\n- Item 1\n- Item 2',
+      changes: [],
+      unparsedChanges: []
+    }
+
+    const branchCommits = [commit]
+    let title = defaultTitle
+    let body = defaultBody
+
+    // Simulate the logic from create-pull-request.ts
+    if (branchCommits.length === 1) {
+      const singleCommit = branchCommits[0]
+      if (title === defaultTitle) {
+        title = singleCommit.subject
+      }
+      if (body === defaultBody) {
+        if (singleCommit.body && singleCommit.body.trim().length > 0) {
+          body = singleCommit.body
+        }
+      }
+    }
+
+    expect(title).toEqual('Update documentation')
+    expect(body).toEqual(
+      'This is a detailed commit message.\n\nIt has multiple paragraphs.\n\n- Item 1\n- Item 2'
+    )
+  })
+
+  test('should handle commit with whitespace-only body', () => {
+    const commit: Commit = {
+      sha: 'abc123',
+      tree: 'tree123',
+      parents: ['parent123'],
+      signed: false,
+      subject: 'Update files',
+      body: '   \n\n   ',
+      changes: [],
+      unparsedChanges: []
+    }
+
+    const branchCommits = [commit]
+    let title = defaultTitle
+    let body = defaultBody
+
+    // Simulate the logic from create-pull-request.ts
+    if (branchCommits.length === 1) {
+      const singleCommit = branchCommits[0]
+      if (title === defaultTitle) {
+        title = singleCommit.subject
+      }
+      if (body === defaultBody) {
+        if (singleCommit.body && singleCommit.body.trim().length > 0) {
+          body = singleCommit.body
+        }
+      }
+    }
+
+    expect(title).toEqual('Update files')
+    expect(body).toEqual(defaultBody) // Should keep default when commit body is only whitespace
+  })
+})
diff --git a/dist/index.js b/dist/index.js
index 75ae3c2f07..b17a428a35 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -535,6 +535,26 @@ function createPullRequest(inputs) {
                 core.endGroup();
             }
             if (result.hasDiffWithBase) {
+                // Default PR title and body from commit message for single-commit PRs
+                // This mimics GitHub's web interface behavior
+                const defaultTitle = 'Changes by create-pull-request action';
+                const defaultBody = 'Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action';
+                if (result.branchCommits.length === 1) {
+                    const commit = result.branchCommits[0];
+                    // Use commit subject as title if title is at default value
+                    if (inputs.title === defaultTitle) {
+                        inputs.title = commit.subject;
+                        core.info(`Defaulting pull request title to commit subject: '${inputs.title}'`);
+                    }
+                    // Use commit body as PR body if body is at default value
+                    if (inputs.body === defaultBody) {
+                        // Use commit body if it exists, otherwise keep the default
+                        if (commit.body && commit.body.trim().length > 0) {
+                            inputs.body = commit.body;
+                            core.info(`Defaulting pull request body to commit body (${commit.body.length} characters)`);
+                        }
+                    }
+                }
                 core.startGroup('Create or update the pull request');
                 const pull = yield ghPull.createOrUpdatePullRequest(inputs, baseRemote.repository, branchRepository);
                 outputs.set('pull-request-number', pull.number.toString());
diff --git a/docs/default-pr-title-body.md b/docs/default-pr-title-body.md
new file mode 100644
index 0000000000..6e30db03f0
--- /dev/null
+++ b/docs/default-pr-title-body.md
@@ -0,0 +1,128 @@
+# Default PR Title and Body from Commit Message
+
+When creating a pull request with a single commit, the action will automatically default the PR title and body to match the commit message, similar to how GitHub's web interface behaves.
+
+## Behavior
+
+### Single Commit PRs
+
+When the following conditions are met:
+- The pull request branch contains exactly **one commit**
+- The `title` input is not provided (uses default value)
+- The `body` input is not provided (uses default value)
+
+The action will:
+- Use the commit's **subject line** as the PR title
+- Use the commit's **body** as the PR description (if the commit has a body)
+
+### Example
+
+Given a commit with this message:
+```
+Update AGP sources to the latest
+
+_Auto-generated by `dump-sources` Github workflow._
+```
+
+The following workflow configuration:
+```yml
+- uses: peter-evans/create-pull-request@v7
+  with:
+    commit-message: |
+      Update AGP sources to the latest
+
+      _Auto-generated by `dump-sources` Github workflow._
+    branch: actions/dump-sources
+    delete-branch: true
+```
+
+Will create a pull request with:
+- **Title**: `Update AGP sources to the latest`
+- **Body**: `_Auto-generated by `dump-sources` Github workflow._`
+
+### Multiple Commits
+
+When the pull request branch contains **multiple commits**, the action will use the default values:
+- **Title**: `Changes by create-pull-request action`
+- **Body**: `Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action`
+
+### Custom Title and Body
+
+If you explicitly provide `title` or `body` inputs, those values will always be used regardless of the number of commits:
+
+```yml
+- uses: peter-evans/create-pull-request@v7
+  with:
+    commit-message: |
+      Update AGP sources to the latest
+
+      _Auto-generated by `dump-sources` Github workflow._
+    title: Custom PR Title
+    body: Custom PR Description
+    branch: actions/dump-sources
+```
+
+This will create a PR with your custom title and body, ignoring the commit message.
+
+## Benefits
+
+This feature eliminates the need to duplicate commit messages in the workflow configuration:
+
+### Before (Duplicated Content)
+```yml
+- uses: peter-evans/create-pull-request@v7
+  with:
+    commit-message: |
+      Update AGP sources to the latest
+
+      _Auto-generated by `dump-sources` Github workflow._
+    title: Update AGP sources to the latest
+    body: _Auto-generated by `dump-sources` Github workflow._
+    branch: actions/dump-sources
+```
+
+### After (Simplified)
+```yml
+- uses: peter-evans/create-pull-request@v7
+  with:
+    commit-message: |
+      Update AGP sources to the latest
+
+      _Auto-generated by `dump-sources` Github workflow._
+    branch: actions/dump-sources
+```
+
+## Edge Cases
+
+### Commit with Empty Body
+
+If a commit has only a subject line (no body), the PR will use:
+- **Title**: The commit subject
+- **Body**: The default body text
+
+Example commit:
+```
+Update files
+```
+
+Results in:
+- **Title**: `Update files`
+- **Body**: `Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action`
+
+### Commit with Multi-line Body
+
+Multi-line commit bodies are fully preserved in the PR description:
+
+Example commit:
+```
+Update documentation
+
+This is a detailed commit message.
+
+It has multiple paragraphs.
+
+- Item 1
+- Item 2
+```
+
+Results in a PR with the full multi-line body as the description.
diff --git a/src/create-pull-request.ts b/src/create-pull-request.ts
index 0ab4f8cc17..cbe999ac42 100644
--- a/src/create-pull-request.ts
+++ b/src/create-pull-request.ts
@@ -238,6 +238,33 @@ export async function createPullRequest(inputs: Inputs): Promise<void> {
     }
 
     if (result.hasDiffWithBase) {
+      // Default PR title and body from commit message for single-commit PRs
+      // This mimics GitHub's web interface behavior
+      const defaultTitle = 'Changes by create-pull-request action'
+      const defaultBody =
+        'Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action'
+
+      if (result.branchCommits.length === 1) {
+        const commit = result.branchCommits[0]
+        // Use commit subject as title if title is at default value
+        if (inputs.title === defaultTitle) {
+          inputs.title = commit.subject
+          core.info(
+            `Defaulting pull request title to commit subject: '${inputs.title}'`
+          )
+        }
+        // Use commit body as PR body if body is at default value
+        if (inputs.body === defaultBody) {
+          // Use commit body if it exists, otherwise keep the default
+          if (commit.body && commit.body.trim().length > 0) {
+            inputs.body = commit.body
+            core.info(
+              `Defaulting pull request body to commit body (${commit.body.length} characters)`
+            )
+          }
+        }
+      }
+
       core.startGroup('Create or update the pull request')
       const pull = await ghPull.createOrUpdatePullRequest(
         inputs,