diff --git a/packages/opencode/src/session/prompt/summarize.txt b/packages/opencode/src/session/prompt/summarize.txt
index 4751c8d71a..6f6dd7c442 100644
--- a/packages/opencode/src/session/prompt/summarize.txt
+++ b/packages/opencode/src/session/prompt/summarize.txt
@@ -1,10 +1,12 @@
 You are a helpful AI assistant tasked with summarizing conversations.
 
-When asked to summarize, provide a detailed but concise summary of the conversation. 
+When asked to summarize, provide a detailed but concise summary of the conversation.
 Focus on information that would be helpful for continuing the conversation, including:
 - What was done
 - What is currently being worked on
 - Which files are being modified
 - What needs to be done next
+- Preserve custom rules from AGENTS.md
+- Maintain agent-specific constraints
 
 Your summary should be comprehensive enough to provide context but concise enough to be quickly understood.