docs: post install notes (#1653)

tools/cli/README.md

@@ -5,3 +5,56 @@
 For external official modules to be discoverable during install, ensure an entry for the external repo is added to external-official-modules.yaml.
 
 For community modules - this will be handled in a different way. This file is only for registration of modules under the bmad-code-org.
+
+## Post-Install Notes
+
+Modules can display setup guidance to users after configuration is collected during `npx bmad-method install`. Notes are defined in the module's own `module.yaml` — no changes to the installer are needed.
+
+### Simple Format
+
+Always displayed after the module is configured:
+
+```yaml
+post-install-notes: |
+  Remember to set the API_KEY environment variable.
+  See: https://example.com/setup
+```
+
+### Conditional Format
+
+Display different messages based on a config question's answer:
+
+```yaml
+post-install-notes:
+  config_key_name:
+    value1: |
+      Instructions for value1...
+    value2: |
+      Instructions for value2...
+```
+
+Values without an entry (e.g., `none`) display nothing. Multiple config keys can each have their own conditional notes.
+
+### Example: TEA Module
+
+The TEA module uses the conditional format keyed on `tea_browser_automation`:
+
+```yaml
+post-install-notes:
+  tea_browser_automation:
+    cli: |
+      Playwright CLI Setup:
+        npm install -g @playwright/cli@latest
+        playwright-cli install --skills
+    mcp: |
+      Playwright MCP Setup (two servers):
+        1. playwright    — npx @playwright/mcp@latest
+        2. playwright-test — npx playwright run-test-mcp-server
+    auto: |
+      Playwright CLI Setup:
+        ...
+      Playwright MCP Setup (two servers):
+        ...
+```
+
+When a user selects `auto`, they see both CLI and MCP instructions. When they select `none`, nothing is shown.