diff --git a/AGENTS.md b/AGENTS.md
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--- a/AGENTS.md
+++ b/AGENTS.md
@@ -1,5 +1,11 @@
 # Agent Guidelines
 
+## Important workflow
+
+1. Understand the problem. Ask questions
+2. Use red/green (tdd). Test must fail before changes are made
+3. Always update documentation after making changes
+
 ## Temporary files
 
 Temporary files (screenshots, traces, recordings, etc.) must be stored in `tmp/`. This directory is gitignored. Never write temporary files to the project root or other directories.