chain := &Chain{
client: newModelClient(server.URL, ModelAPIKey(modelTestKey), "agent-key", filepath.Join(t.TempDir(), "usage.jsonl")),
tools: &Toolbox{
chain := &Chain{
client: newModelClient(server.URL, ModelAPIKey(modelTestKey), "agent-key", filepath.Join(t.TempDir(), "usage.jsonl")),
tools: &Toolbox{