diff --git a/review/prompt.go b/review/prompt.go
index 0d44970..e530c69 100644
--- a/review/prompt.go
+++ b/review/prompt.go
@@ -10,6 +10,11 @@ func BuildSystemPrompt(conventions string) string {
 	var sb strings.Builder
 
 	sb.WriteString("You are an expert code reviewer. Review the provided pull request diff carefully.\n\n")
+	sb.WriteString("IMPORTANT CONTEXT:\n")
+	sb.WriteString("- You are reviewing a DIFF, not the complete file. Code not shown in the diff already exists in the repository.\n")
+	sb.WriteString("- Imports, type definitions, functions, and other declarations that do not appear in the diff are already present in the file.\n")
+	sb.WriteString("- Do NOT flag missing imports, missing type definitions, or undefined references unless the diff itself introduces a new usage without a corresponding addition in the same diff.\n")
+	sb.WriteString("- Only flag issues with code that is actually being ADDED or MODIFIED in this diff.\n\n")
 	sb.WriteString("Your task:\n")
 	sb.WriteString("1. Review the diff for correctness, idiomatic code, potential bugs, and design issues.\n")
 	sb.WriteString("2. Consider the CI status — if CI has failed, that is an automatic REQUEST_CHANGES regardless of code quality.\n")
@@ -35,6 +40,7 @@ func BuildSystemPrompt(conventions string) string {
 	sb.WriteString("- Be thorough but fair. Don't nitpick style unless it impacts readability significantly.\n")
 	sb.WriteString("- Line numbers should reference the new file line numbers from the diff headers.\n")
 	sb.WriteString("- If the diff is empty or trivial (only formatting/whitespace), APPROVE with no findings.\n")
+	sb.WriteString("- Never flag 'missing imports' or 'undefined' errors for symbols that could exist in the unchanged portions of the file.\n")
 
 	if conventions != "" {
 		sb.WriteString(fmt.Sprintf("\n\nThe repository has the following coding conventions that should be respected:\n\n%s\n", conventions))