Show tool invocations in chat; fix planning loop stall

Emit a 'call' message before each tool execution so the UI shows
execute_code(...) with full args before the result. Result lines
are now indented with '= ' to visually pair with the call.

System prompt now explicitly says to call execute_code immediately
after planning, without pausing for confirmation, to prevent smaller
models stalling after the planning step.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agent/loop.go

@@ -68,6 +68,8 @@ func (l *Loop) Run(ctx context.Context, state State) error {
 			var content string
 			var isErr bool
 
+			l.emit(OutputMsg{Role: "call", Name: tc.Name, Content: string(tc.Arguments)})
+
 			if l.cfg.Exec != nil {
 				out, err := l.cfg.Exec(tc.Name, tc.Arguments)
 				if err != nil {

main.go

@@ -65,13 +65,17 @@ If a relevant skill is found, load it:
 Read and follow the loaded skill's instructions before proceeding.
 Re-run discovery if the task domain shifts during execution.
 
-## Step 2 — plan before acting
+## Step 2 — plan, then execute immediately
 
-After skill discovery, state a short numbered plan:
+After skill discovery, write a short numbered plan, then execute it without
+waiting for user input:
 1. Restate the goal.
 2. List the steps you will take.
-Then execute the steps in order. Revise the plan if a step fails or reveals
-new information.`
+3. Call execute_code for the first step immediately after writing the plan.
+
+Do not stop after planning. Do not ask for confirmation. Execute each step
+in sequence, calling execute_code as many times as needed. Revise the plan
+if a step fails or reveals new information.`
 
 // executeCodeTool is the single built-in tool exposed to the model.
 var executeCodeTool = backend.Tool{
@@ -255,8 +259,10 @@ func (m model) runLoop(input string) tea.Cmd {
 			switch msg.Role {
 			case "assistant":
 				lines = append(lines, "Bot: "+msg.Content)
+			case "call":
+				lines = append(lines, fmt.Sprintf("→ %s(%s)", msg.Name, msg.Content))
 			case "tool":
-				lines = append(lines, fmt.Sprintf("→ %s: %s", msg.Name, msg.Content))
+				lines = append(lines, fmt.Sprintf("  = %s", msg.Content))
 			case "error":
 				lines = append(lines, "Error: "+msg.Content)
 			}