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simulate: attribute tool calls and handoffs to the agent in TUI transcript #918

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Merged
u9g merged 2 commits into from
Jul 24, 2026
Merged

simulate: attribute tool calls and handoffs to the agent in TUI transcript #918

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2ff39b1
simulate: attribute tool calls and handoffs to the agent in TUI trans…
u9g Jul 20, 2026
93b42ae
simulate: remove TUI transcript test
u9g Jul 24, 2026
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41 changes: 33 additions & 8 deletions cmd/lk/simulate_tui.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1648,6 +1648,22 @@ func (m *simulateModel) renderChatTranscript(jobID string) string {
}
wrapStyle := lipgloss.NewStyle().Width(wrapWidth)

// Tool calls, tool outputs, and handoffs are agent actions, but appear in
// the chat history after the user message that triggered them and before
// the agent's spoken reply. Open an Agent block for them when needed so
// they don't render under the user's header.
currentSpeaker := ""
toolOpenedAgentBlock := false
ensureAgentBlock := func() {
if currentSpeaker == "agent" {
return
}
b.WriteString("\n")
fmt.Fprintf(&b, " %s\n", agentStyle.Render("Agent"))
currentSpeaker = "agent"
toolOpenedAgentBlock = true
}

for _, item := range chatCtx.Items {
switch v := item.Item.(type) {
case *agent.ChatContext_ChatItem_Message:
Expand All @@ -1656,15 +1672,21 @@ func (m *simulateModel) renderChatTranscript(jobID string) string {
if text == "" {
continue
}
b.WriteString("\n")
switch msg.Role {
case agent.ChatRole_USER:
fmt.Fprintf(&b, " %s\n", userStyle.Render("You"))
case agent.ChatRole_ASSISTANT:
fmt.Fprintf(&b, " %s\n", agentStyle.Render("Agent"))
default:
fmt.Fprintf(&b, " %s\n", dimStyle.Render(string(msg.Role)))
if msg.Role != agent.ChatRole_ASSISTANT || !toolOpenedAgentBlock {
b.WriteString("\n")
switch msg.Role {
case agent.ChatRole_USER:
fmt.Fprintf(&b, " %s\n", userStyle.Render("You"))
currentSpeaker = "user"
case agent.ChatRole_ASSISTANT:
fmt.Fprintf(&b, " %s\n", agentStyle.Render("Agent"))
currentSpeaker = "agent"
default:
fmt.Fprintf(&b, " %s\n", dimStyle.Render(string(msg.Role)))
currentSpeaker = string(msg.Role)
}
}
toolOpenedAgentBlock = false
for line := range strings.SplitSeq(wrapStyle.Render(text), "\n") {
b.WriteString(" " + line + "\n")
}
Expand All @@ -1674,6 +1696,7 @@ func (m *simulateModel) renderChatTranscript(jobID string) string {
if len(args) > 80 {
args = args[:80] + "..."
}
ensureAgentBlock()
b.WriteString(dimStyle.Render(fmt.Sprintf(" ƒ %s(%s)", fc.Name, args)))
b.WriteString("\n")
case *agent.ChatContext_ChatItem_FunctionCallOutput:
Expand All @@ -1685,6 +1708,7 @@ func (m *simulateModel) renderChatTranscript(jobID string) string {
if len(output) > 80 {
output = output[:80] + "..."
}
ensureAgentBlock()
b.WriteString(dimStyle.Render(fmt.Sprintf(" → %s", output)))
b.WriteString("\n")
case *agent.ChatContext_ChatItem_AgentHandoff:
Expand All @@ -1693,6 +1717,7 @@ func (m *simulateModel) renderChatTranscript(jobID string) string {
if h.OldAgentId != nil && *h.OldAgentId != "" {
old = *h.OldAgentId + " → "
}
ensureAgentBlock()
b.WriteString(dimStyle.Render(fmt.Sprintf(" ⤳ %s%s", old, h.NewAgentId)))
b.WriteString("\n")
}
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