diff --git a/aider/coders/navigator_prompts.py b/aider/coders/navigator_prompts.py
index 8ec4f2741..e4466e05a 100644
--- a/aider/coders/navigator_prompts.py
+++ b/aider/coders/navigator_prompts.py
@@ -458,7 +458,7 @@ Here are summaries of some files present in this repo:
 
 ## Tool Call Format
 - Tool calls MUST be at the end of your message, after a '---' separator
-- If emitting multiple tool calls (e.g., 3 or more), place each call on a new line for clarity.
+- If emitting 3 or more tool calls, OR if any tool call spans multiple lines, place each call on a new line for clarity.
 - You are encouraged to use tools for editing where possible, falling back to SEARCH/REPLACE when that doesn't work well.
 
 ## SEARCH/REPLACE blocks
@@ -508,4 +508,4 @@ Let me explore the codebase more strategically this time:
 - I'll use tool calls to automatically continue exploration until I have enough information
 
 I'll start exploring again with improved search strategies to find exactly what we need.
-"""
+"""
\ No newline at end of file