diff --git a/main.go b/main.go
index 273a0f3..da83d19 100644
--- a/main.go
+++ b/main.go
@@ -40,9 +40,10 @@ type cliConfig struct {
 }
 
 var (
-	integration = os.Getenv("INTEGRATION")
-	env         = os.Getenv("ENV")
-	scope       = os.Getenv("SCOPE")
+	integration   = os.Getenv("INTEGRATION")
+	env           = os.Getenv("ENV")
+	scope         = os.Getenv("SCOPE")
+	optionalScope = os.Getenv("OPTIONAL_SCOPE")
 )
 
 func main() {
@@ -100,6 +101,9 @@ func main() {
 		if scope != "" {
 			q.Set("scope", scope)
 		}
+		if optionalScope != "" {
+			q.Set("optional_scope", optionalScope)
+		}
 		u.RawQuery = q.Encode()
 
 		req, err := http.NewRequest("GET", u.String(), nil)
@@ -179,6 +183,9 @@ func main() {
 	if scope != "" {
 		q.Set("scope", scope)
 	}
+	if optionalScope != "" {
+		q.Set("optional_scope", optionalScope)
+	}
 	u.RawQuery = q.Encode()
 
 	gs, err := gptscript.NewGPTScript(gptscript.GlobalOptions{})
diff --git a/tool.gpt b/tool.gpt
index 471407f..cf3f089 100644
--- a/tool.gpt
+++ b/tool.gpt
@@ -2,5 +2,6 @@ Name: oauth2
 Param: integration: Name of the integration to use
 Param: env: Name of the environment variable to set with the token
 Param: scope: Space-separated list of scopes to request
+Param: optional_scope: (optional) Space-separated list of scopes to request (HubSpot-specific)
 
 #!${GPTSCRIPT_TOOL_DIR}/bin/gptscript-go-tool