toolsrv: improve integration tests to match real usage

- Parse ToolResult JSON the same way agent/runtime.go does
- Verify Content structure, Type field, and IsError flag
- Add TestIntegration_ToolExecutionError for failed commands
- Tests now verify the wire format matches what olliesrv expects

toolsrv/integration_test.go

@@ -241,7 +241,7 @@ func TestIntegration_ToolExecution(t *testing.T) {
 		t.Fatal("shell tool not found after loading")
 	}
 
-	// Execute a tool
+	// Execute a tool - this mimics what agent/runtime.go does
 	ctx := context.Background()
 	args := json.RawMessage(`{"cmd": "echo hello from test"}`)
 	result, err := conn.CallTool(ctx, "shell", args)
@@ -249,12 +249,67 @@ func TestIntegration_ToolExecution(t *testing.T) {
 		t.Fatalf("CallTool failed: %v", err)
 	}
 
-	// Result should be JSON containing the output
-	resultStr := string(result)
-	if !strings.Contains(resultStr, "hello from test") {
-		t.Errorf("unexpected result: %s", resultStr)
+	// Parse the result the same way agent/runtime.go does
+	var toolResult ToolResult
+	if err := json.Unmarshal(result, &toolResult); err != nil {
+		t.Fatalf("failed to parse ToolResult: %v (raw: %s)", err, string(result))
 	}
-	t.Logf("Tool result: %s", resultStr)
+
+	// Verify structure
+	if len(toolResult.Content) == 0 {
+		t.Fatal("ToolResult.Content is empty")
+	}
+	if toolResult.Content[0].Type != "text" {
+		t.Errorf("expected type 'text', got %q", toolResult.Content[0].Type)
+	}
+	if !strings.Contains(toolResult.Content[0].Text, "hello from test") {
+		t.Errorf("output doesn't contain expected text: %q", toolResult.Content[0].Text)
+	}
+	if toolResult.IsError {
+		t.Error("ToolResult.IsError should be false")
+	}
+
+	t.Logf("Tool result: %+v", toolResult)
+}
+
+func TestIntegration_ToolExecutionError(t *testing.T) {
+	socketPath, cleanup := startTestServer(t)
+	defer cleanup()
+
+	conn, err := Dial(socketPath, "test-secret-exec-err")
+	if err != nil {
+		t.Fatalf("Dial failed: %v", err)
+	}
+	defer conn.Close()
+
+	// Load the shell tool
+	if err := conn.LoadTool("shell"); err != nil {
+		t.Fatalf("LoadTool failed: %v", err)
+	}
+
+	// Execute a command that fails
+	ctx := context.Background()
+	args := json.RawMessage(`{"cmd": "exit 42"}`)
+	result, err := conn.CallTool(ctx, "shell", args)
+	if err != nil {
+		t.Fatalf("CallTool failed: %v", err)
+	}
+
+	// Parse the result
+	var toolResult ToolResult
+	if err := json.Unmarshal(result, &toolResult); err != nil {
+		t.Fatalf("failed to parse ToolResult: %v (raw: %s)", err, string(result))
+	}
+
+	// Should have exit code in output
+	if len(toolResult.Content) == 0 {
+		t.Fatal("ToolResult.Content is empty")
+	}
+	if !strings.Contains(toolResult.Content[0].Text, "exit: 42") {
+		t.Errorf("output doesn't contain exit code: %q", toolResult.Content[0].Text)
+	}
+
+	t.Logf("Error tool result: %+v", toolResult)
 }
 
 func TestIntegration_ProcessKeeperReconnect(t *testing.T) {