diff --git a/src/tools/index.ts b/src/tools/index.ts
index 23b8f5b58..82d909cea 100644
--- a/src/tools/index.ts
+++ b/src/tools/index.ts
@@ -65,8 +65,9 @@ export const builtinTools: Record<string, ToolDefinition> = {
   ast_grep_replace,
   grep,
   glob,
-  session_list,
-  session_read,
-  session_search,
-  session_info,
+  // Session tools - PascalCase to override OpenCode's built-in HTTP-based session tools
+  SessionList: session_list,
+  SessionRead: session_read,
+  SessionSearch: session_search,
+  SessionInfo: session_info,
 }