[workshop] Add node: Preview Safe Outputs with Staged Mode

workshop/30-staged-mode-preview.md

@@ -0,0 +1,108 @@
+<!-- page-journey: all -->
+<!-- page-adventure: advanced -->
+<!--
+<research-metadata>
+  <focus>Staged mode — previewing safe output operations without applying their writes</focus>
+  <sources>
+    <source>https://github.github.com/gh-aw/reference/staged-mode/</source>
+    <source>https://github.github.com/gh-aw/reference/safe-outputs/</source>
+  </sources>
+  <rationale>Steps 1-29 teach learners to add safe outputs, but none show how to test a new write operation without creating real issues, comments, or pull requests. Step 30 closes that gap with the `staged: true` setting and the Actions step summary preview.</rationale>
+</research-metadata>
+-->
+
+# Preview Safe Outputs with Staged Mode
+
+> _See exactly what your agent would create before it creates anything._
+
+## :dart: What You'll Do
+
+You'll turn on staged mode for a workflow, run it, and read the preview the agent leaves in the Actions run summary. Then you'll scope staging to a single output type and switch it off when you trust the result.
+
+## :clipboard: Before You Start
+
+- You completed [Teach Your Agent Domain Knowledge with Skills](29-skills-and-domain-knowledge.md), or you have any workflow that uses `safe-outputs:`.
+- You can compile with `gh aw compile` from [Using `gh aw compile` to Catch Errors Early](side-quest-07-01-compile-workflow.md).
+
+## Understand staged mode
+
+A **safe output** is a write your agent is allowed to request, such as creating an issue or adding a comment. **Staged mode** lets the agent run in full, but replaces each built-in write with a preview. Nothing is created in your repository.
+
+> [!NOTE]
+> Staging is not a sandbox. Custom jobs, external tools, memory, and caches still run, so they need their own controls.
+
+## Steps
+
+### Enable staged mode
+
+1. Open a workflow that has `safe-outputs:`. This example uses an issue triage workflow:
+
+   ```yaml
+   ---
+   on:
+     workflow_dispatch:
+   permissions:
+     contents: read
+     issues: read
+   engine: copilot
+   safe-outputs:
+     staged: true
+     create-issue:
+       title-prefix: "[ai] "
+       labels: [automation]
+   ---
+
+   # Issue Analyzer
+
+   Review the three most recent open issues and suggest one follow-up task.
+   ```
+
+2. Compile the workflow:
+
+   ```bash
+   gh aw compile
+   ```
+
+### Run and read the preview
+
+1. Run the workflow from the **Actions** tab on GitHub.com, or with the command from [Run and Watch Your Workflow](08-run-your-workflow.md).
+2. When the run finishes, open it and scroll to the **Summary** page.
+3. Find the heading that starts with the 🎭 emoji. It lists each operation the agent would have performed, including the title, body, and labels.
+4. Open the **Issues** tab and confirm no new issue was created.
+
+> :thinking: **Predict:** Before you read the preview, guess what title the agent will choose. How close was it?
+
+### Stage only one output type
+
+Global staging is all-or-nothing. When one output is new and the others are proven, stage just that one:
+
+```yaml
+safe-outputs:
+  create-pull-request:
+    staged: true
+  add-comment:
+```
+
+Here, pull requests are previewed while comments run normally. A type-level `staged: false` cannot override global staging.
+
+### Iterate, then go live
+
+1. Adjust the prompt in the workflow body.
+2. Run `gh aw compile`, then run the workflow again.
+3. Repeat until the 🎭 preview looks right.
+4. Remove `staged: true` (or set it to `false`), compile, and run once more to create real resources.
+
+> [!TIP]
+> Keep staging on whenever you change the prompt. Re-enable it for a single output type when you add a new safe output.
+
+For the full list of supported outputs and preview messages, see [Staged Mode](https://github.github.com/gh-aw/reference/staged-mode/).
+
+## :white_check_mark: Checkpoint
+
+- [ ] You added `staged: true` under `safe-outputs:` and `gh aw compile` succeeded
+- [ ] You ran the workflow and found the 🎭 preview in the run summary
+- [ ] You confirmed no issue, comment, or pull request was created while staging was on
+- [ ] You can show how to stage a single output type instead of all outputs
+- [ ] You removed or disabled staging and saw the real output appear
+
+Want to choose another branch from the workshop hub? Return to [What's Next? Keep Exploring](14-next-steps.md).

workshop/README.md

@@ -41,6 +41,7 @@ A hands-on workshop that takes you from zero to a fully automated, AI-powered wo
 | 27 | [Verify Your Workflow Quality with Evals](27-evaluate-workflow-quality.md) |
 | 28 | [Orchestrate Multiple Agentic Workflows](28-orchestrate-workflows.md) |
 | 29 | [Teach Your Agent Domain Knowledge with Skills](29-skills-and-domain-knowledge.md) |
+| 30 | [Preview Safe Outputs with Staged Mode](30-staged-mode-preview.md) |
 
 ## Optional Side Quests