Incorporate new recommendations

See discussion on #49119

Author: BillWagner

.github/copilot-instructions.md

@@ -58,6 +58,32 @@ Examples:
 - ❌ Bad: `configure_logging.md`
 - ❌ Bad: `DependencyInjectionGuidelines.md`
 
+## Documentation from External Sources (Blog Posts, Announcements)
+
+When adapting content from external sources like blog posts into documentation:
+
+**DO:**
+- Work on one version/topic at a time - never combine multiple versions in a single PR.
+- Copy working code samples directly from source when available.
+- Execute and validate all code examples with appropriate tools (`dotnet fsi` for F#, simple console apps for C#).
+- Provide execution proofs in PR comments for any generated code.
+- Create a checklist TODO for each section of the source document before writing.
+- Map each documentation section 1:1 to source content.
+- Explicitly state what is copied vs. generated in PR description.
+
+**DON'T:**
+- Invent or elaborate on features not explicitly mentioned in source.
+- Create placeholder sections without content.
+- Assume feature details or characteristics.
+- Combine information from multiple versions/sources.
+- Add examples without verifying they demonstrate the stated feature.
+
+**PR Description Must Include:**
+- Content source breakdown (% copied vs. generated).
+- List of fabricated/generated sections requiring expert review.
+- Execution proof for all code samples.
+- Clear warnings about any uncertainties.
+
 ## Special Cases
 
 ### Breaking Changes