diff --git a/.github/agents/Planning.agent.md b/.github/agents/Planning.agent.md
index 1cf52ee1..9d921da2 100644
--- a/.github/agents/Planning.agent.md
+++ b/.github/agents/Planning.agent.md
@@ -83,4 +83,7 @@ Your goal is to design the **User Experience** first, then engineer the **Backen
 
 - NO FLUFF: Be detailed in technical specs, but do not offer "friendly" conversational filler. Get straight to the plan.
 
-- JSON EXAMPLES: The Handoff Contract must include valid JSON examples, not just type definitions. </constraints>
+- JSON EXAMPLES: The Handoff Contract must include valid JSON examples, not just type definitions.
+
+- New Code and Edits: Don't just suggest adding or editing code. Deep research all possible impacts and dependencies before making changes. If X file is changed, what other files are affected? Do those need changes too? New code and partial edits are both leading causes of bugs when the entire scope isn't considered.
+</constraints>