Improve tool detail formatting

internal/telegram/render_test.go

@@ -1,6 +1,7 @@
 package telegram
 
 import (
+	"encoding/json"
 	"fmt"
 	"path/filepath"
 	"strings"
@@ -155,7 +156,7 @@ func TestRenderCodexCommandExecutionItem(t *testing.T) {
 		ExitCode:         &exitCode,
 	}
 	text := renderCodexItemCompleted(item)
-	for _, want := range []string{"Tool call: command finished", "Command: go test ./...", "Exit code: 0", "line 1"} {
+	for _, want := range []string{"Tool call: command finished", "Command: go test ./...", "Exit code: 0", "<pre><code class=\"language-text\">line 1\nline 2</code></pre>"} {
 		if !strings.Contains(text, want) {
 			t.Fatalf("rendered command item missing %q in %q", want, text)
 		}
@@ -169,6 +170,38 @@ func TestRenderCodexStartedItems(t *testing.T) {
 	}
 }
 
+func TestRenderDynamicToolDetailsSelectsUsefulArguments(t *testing.T) {
+	item := codexThreadItemView{
+		Type:      "dynamicToolCall",
+		Namespace: "functions",
+		Tool:      "exec_command",
+		Status:    "completed",
+		Arguments: json.RawMessage(`{"cmd":"go test ./...","irrelevant":{"large":"object"}}`),
+	}
+	text := renderCodexItemCompleted(item)
+	for _, want := range []string{"Tool: functions.exec_command", "<b>cmd</b>", "language-bash", "go test ./..."} {
+		if !strings.Contains(text, want) {
+			t.Fatalf("rendered tool details missing %q in %q", want, text)
+		}
+	}
+	if strings.Contains(text, "irrelevant") {
+		t.Fatalf("rendered tool details should omit irrelevant argument JSON: %q", text)
+	}
+}
+
+func TestRenderApprovalDetailsAvoidsRawJSONDump(t *testing.T) {
+	raw := json.RawMessage(`{"command":"go test ./...","cwd":"/workspace/project","unused":{"nested":true}}`)
+	text := renderApprovalHTML("item/commandExecution/requestApproval", raw, "")
+	for _, want := range []string{"Codex requests command approval", "language-bash", "go test ./...", "CWD"} {
+		if !strings.Contains(text, want) {
+			t.Fatalf("approval render missing %q in %q", want, text)
+		}
+	}
+	if strings.Contains(text, "unused") {
+		t.Fatalf("approval render should omit unused JSON: %q", text)
+	}
+}
+
 func TestToolMessageAddsEditedAtBeforeDetails(t *testing.T) {
 	tool := toolMessageState{
 		toolHTML: SummaryDetailsHTML("Tool call: command finished\nCommand: go test ./...", "full output"),