diff --git a/credentials.go b/credentials.go
index 4c7c11f..ca04c6c 100644
--- a/credentials.go
+++ b/credentials.go
@@ -15,6 +15,7 @@ type Credential struct {
 	Type         CredentialType    `json:"type"`
 	Env          map[string]string `json:"env"`
 	Ephemeral    bool              `json:"ephemeral,omitempty"`
+	CheckParam   string            `json:"checkParam"`
 	ExpiresAt    *time.Time        `json:"expiresAt"`
 	RefreshToken string            `json:"refreshToken"`
 }
diff --git a/gptscript_test.go b/gptscript_test.go
index 213a7a6..af14f98 100644
--- a/gptscript_test.go
+++ b/gptscript_test.go
@@ -1716,6 +1716,7 @@ func TestCredentials(t *testing.T) {
 		Type:         CredentialTypeTool,
 		Env:          map[string]string{"ENV": "testing"},
 		RefreshToken: "my-refresh-token",
+		CheckParam:   "my-check-param",
 	})
 	require.NoError(t, err)
 
@@ -1732,6 +1733,7 @@ func TestCredentials(t *testing.T) {
 	require.Contains(t, cred.Env, "ENV")
 	require.Equal(t, cred.Env["ENV"], "testing")
 	require.Equal(t, cred.RefreshToken, "my-refresh-token")
+	require.Equal(t, cred.CheckParam, "my-check-param")
 
 	// Delete
 	err = g.DeleteCredential(context.Background(), "testing", name)