Refine agent config schema and prompt file loading

pkg/agent/subagent_prompt_test.go

@@ -0,0 +1,43 @@
+package agent
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"clawgo/pkg/tools"
+)
+
+func TestBuildSubagentTaskInputPrefersPromptFile(t *testing.T) {
+	workspace := t.TempDir()
+	if err := os.MkdirAll(filepath.Join(workspace, "agents", "coder"), 0755); err != nil {
+		t.Fatalf("mkdir failed: %v", err)
+	}
+	if err := os.WriteFile(filepath.Join(workspace, "agents", "coder", "AGENT.md"), []byte("coder-file-policy"), 0644); err != nil {
+		t.Fatalf("write AGENT failed: %v", err)
+	}
+	loop := &AgentLoop{workspace: workspace}
+	input := loop.buildSubagentTaskInput(&tools.SubagentTask{
+		Task:             "implement login flow",
+		SystemPrompt:     "inline-fallback",
+		SystemPromptFile: "agents/coder/AGENT.md",
+	})
+	if !strings.Contains(input, "coder-file-policy") {
+		t.Fatalf("expected prompt file content, got: %s", input)
+	}
+	if strings.Contains(input, "inline-fallback") {
+		t.Fatalf("expected file prompt to take precedence, got: %s", input)
+	}
+}
+
+func TestBuildSubagentTaskInputFallsBackToInlinePrompt(t *testing.T) {
+	loop := &AgentLoop{workspace: t.TempDir()}
+	input := loop.buildSubagentTaskInput(&tools.SubagentTask{
+		Task:         "run regression",
+		SystemPrompt: "test inline prompt",
+	})
+	if !strings.Contains(input, "test inline prompt") {
+		t.Fatalf("expected inline prompt in task input, got: %s", input)
+	}
+}