1package agent
2
3import (
4 "bufio"
5 "context"
6 "encoding/json"
7 "errors"
8 "fmt"
9 "io"
10 "os"
11 "os/signal"
12 "path/filepath"
13 "slices"
14 "strings"
15 "sync"
16 "syscall"
17 "time"
18
19 "github.com/bnema/zut/packages/agent/extensions"
20 "github.com/bnema/zut/packages/agent/extproto"
21 "github.com/bnema/zut/packages/agent/modes"
22 "github.com/bnema/zut/packages/agent/skills"
23 "github.com/bnema/zut/packages/agent/subagents"
24 "github.com/bnema/zut/packages/agent/tools"
25 "github.com/bnema/zut/packages/core"
26 "github.com/bnema/zut/packages/provider"
27 "github.com/bnema/zut/packages/provider/auth"
28 "github.com/bnema/zut/packages/tui"
29)
30
31// interactiveExtHooks is a tiny adapter that lets the extension
32// manager call back into the Interactive instance built later in
33// runInteractive. Alerts are buffered until the instance is attached so
34// an extension that signals attention during startup is not silently lost.
35// Keep the startup buffer bounded because extensions can flood their host.
36const maxBufferedInteractiveAlerts = 64
37
38type interactiveExtHooks struct {
39 mu sync.Mutex
40 interactive *modes.Interactive
41 pendingAlerts []interactiveAlert
42 pendingStatuses map[string]interactiveStatus
43 pendingWidgets map[string]interactiveWidget
44}
45
46type interactiveAlert struct {
47 extName string
48 alert extproto.AlertRequest
49}
50
51type interactiveStatus struct {
52 extName string
53 key string
54 level string
55 text string
56}
57
58type interactiveWidget struct {
59 extName string
60 id string
61 position string
62 title string
63 lines []string
64}
65
66func (h *interactiveExtHooks) iv() *modes.Interactive {
67 if h == nil {
68 return nil
69 }
70 h.mu.Lock()
71 defer h.mu.Unlock()
72 return h.interactive
73}
74
75func (h *interactiveExtHooks) attachInteractive(iv *modes.Interactive) {
76 if h == nil || iv == nil {
77 return
78 }
79 h.mu.Lock()
80 h.interactive = iv
81 pendingAlerts := h.pendingAlerts
82 pendingStatuses := h.pendingStatuses
83 pendingWidgets := h.pendingWidgets
84 h.pendingAlerts = nil
85 h.pendingStatuses = nil
86 h.pendingWidgets = nil
87 h.mu.Unlock()
88 for _, item := range pendingAlerts {
89 iv.Alert(item.extName, item.alert)
90 }
91 for _, item := range pendingStatuses {
92 iv.SetStatus(item.extName, item.key, item.level, item.text)
93 }
94 for _, item := range pendingWidgets {
95 iv.SetWidget(item.extName, item.id, item.position, item.title, item.lines)
96 }
97}
98
99func (h *interactiveExtHooks) Notify(extName, level, message string) {
100 if iv := h.iv(); iv != nil {
101 iv.Notify(extName, level, message)
102 }
103}
104func (h *interactiveExtHooks) Alert(extName string, alert extproto.AlertRequest) {
105 if h == nil {
106 return
107 }
108 h.mu.Lock()
109 if h.interactive == nil {
110 if len(h.pendingAlerts) < maxBufferedInteractiveAlerts {
111 h.pendingAlerts = append(h.pendingAlerts, interactiveAlert{extName: extName, alert: alert})
112 }
113 h.mu.Unlock()
114 return
115 }
116 iv := h.interactive
117 h.mu.Unlock()
118 iv.Alert(extName, alert)
119}
120func (h *interactiveExtHooks) Submit(text string) {
121 if iv := h.iv(); iv != nil {
122 iv.SubmitOrQueue(text, nil)
123 }
124}
125func (h *interactiveExtHooks) SubmitSlash(text string) {
126 if iv := h.iv(); iv != nil {
127 iv.SubmitSlash(text)
128 }
129}
130func (h *interactiveExtHooks) Insert(text string) {
131 if iv := h.iv(); iv != nil {
132 iv.Insert(text)
133 }
134}
135func (h *interactiveExtHooks) Display(extName, text string) {
136 if iv := h.iv(); iv != nil {
137 iv.Display(extName, text)
138 }
139}
140func (h *interactiveExtHooks) ClearNotes(extName string) {
141 if iv := h.iv(); iv != nil {
142 iv.ClearNotes(extName)
143 }
144}
145func (h *interactiveExtHooks) OpenPanel(extName string, spec extproto.PanelSpec) {
146 if iv := h.iv(); iv != nil {
147 iv.OpenPanel(extName, spec)
148 }
149}
150func (h *interactiveExtHooks) UpdatePanel(extName, panelID, title string, lines []string, footer string) {
151 if iv := h.iv(); iv != nil {
152 iv.UpdatePanel(extName, panelID, title, lines, footer)
153 }
154}
155func (h *interactiveExtHooks) ClosePanel(extName, panelID string) {
156 if iv := h.iv(); iv != nil {
157 iv.ClosePanel(extName, panelID)
158 }
159}
160func pendingChromeKey(extName, key string) string { return extName + "\x00" + key }
161
162func (h *interactiveExtHooks) SetStatus(extName, key, level, text string) {
163 if h == nil {
164 return
165 }
166 h.mu.Lock()
167 if h.interactive == nil {
168 if h.pendingStatuses == nil {
169 h.pendingStatuses = map[string]interactiveStatus{}
170 }
171 pendingKey := pendingChromeKey(extName, key)
172 if strings.TrimSpace(text) == "" {
173 delete(h.pendingStatuses, pendingKey)
174 } else {
175 h.pendingStatuses[pendingKey] = interactiveStatus{extName: extName, key: key, level: level, text: text}
176 }
177 h.mu.Unlock()
178 return
179 }
180 iv := h.interactive
181 h.mu.Unlock()
182 iv.SetStatus(extName, key, level, text)
183}
184func (h *interactiveExtHooks) SetWidget(extName, id, position, title string, lines []string) {
185 if h == nil {
186 return
187 }
188 h.mu.Lock()
189 if h.interactive == nil {
190 if h.pendingWidgets == nil {
191 h.pendingWidgets = map[string]interactiveWidget{}
192 }
193 h.pendingWidgets[pendingChromeKey(extName, id)] = interactiveWidget{
194 extName: extName, id: id, position: position, title: title, lines: append([]string(nil), lines...),
195 }
196 h.mu.Unlock()
197 return
198 }
199 iv := h.interactive
200 h.mu.Unlock()
201 iv.SetWidget(extName, id, position, title, lines)
202}
203func (h *interactiveExtHooks) ClearWidget(extName, id string) {
204 if h == nil {
205 return
206 }
207 h.mu.Lock()
208 if h.interactive == nil {
209 if h.pendingWidgets != nil {
210 delete(h.pendingWidgets, pendingChromeKey(extName, id))
211 }
212 h.mu.Unlock()
213 return
214 }
215 iv := h.interactive
216 h.mu.Unlock()
217 iv.ClearWidget(extName, id)
218}
219
220func (h *interactiveExtHooks) ClearExtensionChrome(extName string) {
221 if h == nil {
222 return
223 }
224 h.mu.Lock()
225 if h.interactive == nil {
226 prefix := extName + "\x00"
227 for key := range h.pendingStatuses {
228 if strings.HasPrefix(key, prefix) {
229 delete(h.pendingStatuses, key)
230 }
231 }
232 for key := range h.pendingWidgets {
233 if strings.HasPrefix(key, prefix) {
234 delete(h.pendingWidgets, key)
235 }
236 }
237 h.mu.Unlock()
238 return
239 }
240 iv := h.interactive
241 h.mu.Unlock()
242 iv.ClearExtensionChrome(extName)
243}
244
245// extToolAdapter bridges *extensions.Manager to the
246// ExtensionToolSource interface declared in build.go (kept narrow to
247// avoid a build->extensions import cycle). One adapter instance per
248// run; used at every Resolve point so re-built agents pick up the
249// same set of extension tools.
250type extToolAdapter struct {
251 mgr *extensions.Manager
252}
253
254var _ ExtensionToolSource = (*extToolAdapter)(nil)
255var _ ExtensionSkillSource = (*extToolAdapter)(nil)
256
257func (a *extToolAdapter) Skills() []*skills.Skill {
258 if a == nil || a.mgr == nil {
259 return nil
260 }
261 return a.mgr.Skills()
262}
263
264func (a *extToolAdapter) Tools() []ExtensionToolInfo {
265 infos := a.mgr.Tools()
266 out := make([]ExtensionToolInfo, len(infos))
267 for i, t := range infos {
268 out[i] = ExtensionToolInfo{
269 Extension: t.Extension,
270 Name: t.Name,
271 Description: t.Description,
272 Schema: t.Schema,
273 Deferred: t.Deferred,
274 }
275 }
276 return out
277}
278
279func (a *extToolAdapter) NewExtensionTool(info ExtensionToolInfo) core.Tool {
280 return extensions.NewTool(a.mgr, extensions.ToolInfo{
281 Extension: info.Extension,
282 Name: info.Name,
283 Description: info.Description,
284 Schema: info.Schema,
285 Deferred: info.Deferred,
286 })
287}
288
289// liveInteractiveAgent returns the agent currently owned by the TUI. The
290// fallback is only used before the Interactive has been constructed.
291//
292// Agent rebuilds, such as cross-provider model switches, replace the TUI's
293// agent without replacing the startup pointer held by runInteractive. Session
294// operations must therefore resolve the live agent at the time of the action.
295func liveInteractiveAgent(iv *modes.Interactive, fallback *core.Agent) *core.Agent {
296 if iv != nil {
297 return iv.Agent()
298 }
299 return fallback
300}
301
302func newSessionTransition(mu *sync.RWMutex) func(func()) {
303 return func(fn func()) {
304 mu.Lock()
305 defer mu.Unlock()
306 fn()
307 }
308}
309
310// newPersistModelCallback returns the callback used by the TUI while its
311// session transition write lock is held. It must not acquire that lock again
312// because sync.RWMutex is not reentrant.
313func newPersistModelCallback(persistMu *sync.Mutex, sess **core.Session, activeProvider, activeModel *string, notify func(string)) func(string, string) {
314 return func(providerName, model string) {
315 providerName = strings.TrimSpace(providerName)
316 model = strings.TrimSpace(model)
317
318 persistMu.Lock()
319 var sessionErr error
320 if *sess != nil {
321 sessionErr = (*sess).UpdateModel(providerName, model)
322 }
323 *activeProvider = providerName
324 *activeModel = model
325 persistMu.Unlock()
326 if sessionErr != nil {
327 if notify != nil {
328 notify("model change was not persisted: " + sessionErr.Error())
329 }
330 return
331 }
332
333 cfg, err := LoadConfig()
334 if err != nil {
335 if notify != nil {
336 notify("model changed for this run, but config could not be read: " + err.Error())
337 }
338 return
339 }
340 cfg.Provider = providerName
341 cfg.Model = model
342 if err := SaveConfig(cfg); err != nil && notify != nil {
343 notify("model changed for this run, but config could not be saved: " + err.Error())
344 }
345 }
346}
347
348func closeAgentLSP(ag *core.Agent) {
349 if ag != nil {
350 _ = tools.CloseLSPManagers(ag.ToolsSnapshot())
351 }
352}
353
354func closeResolvedLSP(r Resolved) {
355 _ = tools.CloseLSPManagers(r.ToolRegistry)
356}
357
358func trimMessagesForResume(msgs []provider.Message, keepTail int) []provider.Message {
359 if keepTail <= 0 || len(msgs) <= keepTail {
360 return provider.RepairOrphanedToolResults(msgs)
361 }
362 var out []provider.Message
363 start := len(msgs) - keepTail
364 var carriedToolNames []string
365 addToolNames := func(names []string) {
366 for _, name := range names {
367 if name == "" || slices.Contains(carriedToolNames, name) {
368 continue
369 }
370 carriedToolNames = append(carriedToolNames, name)
371 }
372 }
373 // Activation markers in the discarded prefix still affect the retained
374 // provider request. Carry them onto its first message rather than dropping
375 // deferred-tool availability when the resume tail is shortened.
376 for _, msg := range msgs[:start] {
377 addToolNames(msg.AddedToolNames)
378 }
379 // Preserve the synthetic compaction summary when present so an
380 // already-compacted session stays compacted after resume. Count it
381 // within the tail budget instead of dropping it at the exact boundary.
382 if len(msgs) > 0 && msgs[0].Meta["compaction"] == "true" && start > 0 {
383 out = append(out, msgs[0])
384 start++
385 }
386 // Avoid hydrating a tail that starts with orphan tool_result rows;
387 // provider APIs require those to be paired with an earlier tool_use.
388 for start < len(msgs) && msgs[start].Role == provider.RoleTool {
389 start++
390 }
391 out = append(out, msgs[start:]...)
392 if len(carriedToolNames) > 0 && len(out) > 0 {
393 first := out[0]
394 for _, name := range first.AddedToolNames {
395 addToolNames([]string{name})
396 }
397 first.AddedToolNames = append([]string(nil), carriedToolNames...)
398 out[0] = first
399 }
400 return provider.RepairOrphanedToolResults(out)
401}
402
403// sessionResumeCandidate contains all state needed to resume a session.
404// It is deliberately assembled before the caller changes any live state:
405// opening the transcript, reading usage, and rebuilding a provider/model
406// must all succeed before the candidate can replace the current session.
407type sessionResumeCandidate struct {
408 session *core.Session
409 agent *core.Agent
410 messages []provider.Message
411 fullMessageCount int
412 cumulative provider.Usage
413 lastTurn provider.Usage
414 provider string
415 model string
416 rebuilt bool
417}
418
419// prepareSessionResume opens and validates a selected session without
420// touching the current agent. Missing provider/model metadata is treated as
421// legacy metadata: the current agent is reused, preserving compatibility
422// with sessions written before those fields were persisted.
423//
424// The returned candidate owns session until its caller commits it. On any
425// error this function closes the candidate session and leaves the current
426// agent untouched.
427func prepareSessionResume(path string, current *core.Agent, currentProvider, currentModel string, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (sessionResumeCandidate, error) {
428 return prepareSessionResumeWithOptions(path, current, currentProvider, currentModel, false, false, buildAgentFor)
429}
430
431// prepareSessionResumeWithOptions is the provider/model-aware implementation.
432// An explicit CLI provider or model keeps that field authoritative; an empty
433// field falls back to the selected session's metadata when it is complete.
434func prepareSessionResumeWithOptions(path string, current *core.Agent, currentProvider, currentModel string, explicitProvider, explicitModel bool, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (candidate sessionResumeCandidate, err error) {
435 if current == nil {
436 return candidate, fmt.Errorf("no agent running; log in first")
437 }
438
439 sess, msgs, err := core.OpenSession(path)
440 if err != nil {
441 return candidate, err
442 }
443 keepSession := false
444 defer func() {
445 if !keepSession {
446 _ = sess.Close()
447 }
448 }()
449
450 cumulative, lastTurn, err := core.SessionUsageDetail(path)
451 if err != nil {
452 return candidate, fmt.Errorf("read session usage: %w", err)
453 }
454
455 fullMessageCount := len(msgs)
456 resumedMessages := trimMessagesForResume(msgs, 100)
457 storedProvider := strings.TrimSpace(sess.Meta.Provider)
458 storedModel := strings.TrimSpace(sess.Meta.Model)
459 currentProvider = strings.TrimSpace(currentProvider)
460 currentModel = strings.TrimSpace(currentModel)
461
462 candidate = sessionResumeCandidate{
463 session: sess,
464 agent: current,
465 messages: resumedMessages,
466 fullMessageCount: fullMessageCount,
467 cumulative: cumulative,
468 lastTurn: lastTurn,
469 provider: currentProvider,
470 model: currentModel,
471 }
472
473 // Old sessions may have either field absent. Only a complete stored
474 // selection is actionable; otherwise resume exactly as older zut did.
475 if storedProvider == "" || storedModel == "" {
476 keepSession = true
477 return candidate, nil
478 }
479
480 resumeProvider := storedProvider
481 if explicitProvider {
482 resumeProvider = currentProvider
483 }
484 resumeModel := storedModel
485 if explicitModel {
486 resumeModel = currentModel
487 }
488 if resumeProvider == currentProvider && resumeModel == currentModel {
489 keepSession = true
490 return candidate, nil
491 }
492 if buildAgentFor == nil {
493 return sessionResumeCandidate{}, fmt.Errorf("cannot resume session with provider %q and model %q: no agent builder configured", resumeProvider, resumeModel)
494 }
495
496 rebuilt, resolvedProvider, resolvedModel, err := buildAgentFor(resumeProvider, resumeModel)
497 if err != nil {
498 return sessionResumeCandidate{}, fmt.Errorf("rebuild agent for session provider %q/model %q: %w", resumeProvider, resumeModel, err)
499 }
500 if rebuilt == nil {
501 return sessionResumeCandidate{}, fmt.Errorf("rebuild agent for session provider %q/model %q returned no agent", resumeProvider, resumeModel)
502 }
503 resolvedProvider = strings.TrimSpace(resolvedProvider)
504 resolvedModel = strings.TrimSpace(resolvedModel)
505 if resolvedProvider == "" {
506 resolvedProvider = storedProvider
507 }
508 if resolvedModel == "" {
509 resolvedModel = storedModel
510 }
511
512 // Hydrate and seed the replacement while it is still private. The live
513 // agent is not modified until the caller commits the complete candidate.
514 rebuilt.SetMessages(resumedMessages)
515 rebuilt.SeedCost(cumulative)
516 rebuilt.SeedLastTurnUsage(lastTurn)
517 candidate.agent = rebuilt
518 candidate.provider = resolvedProvider
519 candidate.model = resolvedModel
520 candidate.rebuilt = true
521 keepSession = true
522 return candidate, nil
523}
524
525// buildNonInteractiveSessionAgent constructs a provider/model-specific agent
526// for startup resume while preserving the cwd sandbox and extension tools that
527// were attached to the initial resolution.
528func buildNonInteractiveSessionAgent(ctx context.Context, args Args, base Resolved, extMgr *extensions.Manager, providerName, model string) (*core.Agent, string, string, error) {
529 next := args
530 next.Provider = providerName
531 next.Model = model
532 resolved, err := Resolve(next, true)
533 if err != nil {
534 return nil, "", "", err
535 }
536 resolved.UseSandbox(base.Sandbox)
537 if extMgr != nil {
538 resolved.MergeExtensionTools(&extToolAdapter{mgr: extMgr})
539 }
540 ag := resolved.NewAgent()
541 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
542 return ag, resolved.Provider, resolved.Model, nil
543}
544
545// applySessionResume shares the startup gate, candidate hydration, and
546// commit order used by interactive and non-interactive session opening. The
547// old append handle is closed only after the candidate has been prepared and
548// seeded successfully.
549func applySessionResume(sess *core.Session, ag *core.Agent, currentProvider, currentModel string, explicitProvider, explicitModel bool, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (sessionResumeCandidate, error) {
550 candidate := sessionResumeCandidate{
551 session: sess,
552 agent: ag,
553 fullMessageCount: 0,
554 provider: currentProvider,
555 model: currentModel,
556 }
557 if ag != nil {
558 candidate.fullMessageCount = len(ag.Messages())
559 }
560 if sess == nil || ag == nil {
561 return candidate, nil
562 }
563 // A newly created meta-only session is already on the active pair. Avoid
564 // reopening and closing it through the resume path: Close intentionally
565 // removes fresh empty sessions, and a second append handle would otherwise
566 // keep an unlinked file alive.
567 if len(ag.Messages()) == 0 &&
568 strings.TrimSpace(sess.Meta.Provider) == strings.TrimSpace(currentProvider) &&
569 strings.TrimSpace(sess.Meta.Model) == strings.TrimSpace(currentModel) {
570 return candidate, nil
571 }
572 candidate, err := prepareSessionResumeWithOptions(sess.Path, ag, currentProvider, currentModel, explicitProvider, explicitModel, buildAgentFor)
573 if err != nil {
574 _ = sess.Close()
575 return sessionResumeCandidate{}, err
576 }
577 if !candidate.rebuilt {
578 candidate.agent.SetMessages(candidate.messages)
579 candidate.agent.SeedCost(candidate.cumulative)
580 candidate.agent.SeedLastTurnUsage(candidate.lastTurn)
581 }
582 _ = sess.Close()
583 return candidate, nil
584}
585
586// applyInitialSessionResume applies the same provider/model-aware candidate
587// contract used by interactive session switching to non-interactive startup
588// modes. The returned session owns the replacement append handle.
589func applyInitialSessionResume(ctx context.Context, args Args, base Resolved, extMgr *extensions.Manager, sess *core.Session, ag *core.Agent) (*core.Session, *core.Agent, string, string, error) {
590 candidate, err := applySessionResume(sess, ag, base.Provider, base.Model,
591 strings.TrimSpace(args.Provider) != "", strings.TrimSpace(args.Model) != "", func(providerName, model string) (*core.Agent, string, string, error) {
592 return buildNonInteractiveSessionAgent(ctx, args, base, extMgr, providerName, model)
593 })
594 if err != nil {
595 return nil, ag, "", "", err
596 }
597 return candidate.session, candidate.agent, candidate.provider, candidate.model, nil
598}
599
600// fanoutAgentEvent translates a core.AgentEvent into the wire-format
601// EventFromHost and pushes it through the extension manager. Only
602// the events that have a clear extension-facing meaning are
603// forwarded; internal-only ones (text_delta, tool_progress) are
604// dropped to keep the per-extension stream sane.
605func sessionContext(sess *core.Session) *extproto.SessionContext {
606 if sess == nil {
607 return nil
608 }
609 return &extproto.SessionContext{
610 ID: sess.Meta.ID,
611 ParentID: sess.Meta.Parent,
612 Path: sess.Path,
613 CWD: sess.Meta.CWD,
614 ForkPoint: sess.Meta.ForkPoint,
615 }
616}
617
618func announceSession(mgr *extensions.Manager, sess *core.Session) {
619 if mgr == nil {
620 return
621 }
622 var states map[string]json.RawMessage
623 if sess != nil {
624 states = copyExtensionStates(sess.ExtensionState)
625 }
626 mgr.EmitSessionEvent("session_start", sessionContext(sess), states)
627 if sess != nil {
628 mgr.EmitSessionEvent("session_opened", sessionContext(sess), states)
629 }
630}
631
632func copyExtensionStates(states map[string]json.RawMessage) map[string]json.RawMessage {
633 if len(states) == 0 {
634 return nil
635 }
636 out := make(map[string]json.RawMessage, len(states))
637 for name, state := range states {
638 out[name] = append(json.RawMessage(nil), state...)
639 }
640 return out
641}
642
643func persistExtensionToolResult(mgr *extensions.Manager, sess *core.Session, result core.ToolResult) {
644 if sess == nil {
645 return
646 }
647 details, ok := result.Details.(extensions.ToolResultDetails)
648 if !ok || details.Extension == "" || len(details.State) == 0 {
649 return
650 }
651 if err := sess.AppendExtensionState(details.Extension, details.State); err != nil {
652 fmt.Fprintf(os.Stderr, "extension state: %v\n", err)
653 return
654 }
655 if mgr != nil {
656 mgr.UpdateSessionState(details.Extension, details.State)
657 }
658}
659
660func fanoutAgentEvent(mgr *extensions.Manager, ev core.AgentEvent) {
661 if mgr == nil {
662 return
663 }
664 switch e := ev.(type) {
665 case core.EvTurnStart:
666 mgr.EmitEvent(extproto.EventFromHost{Event: "turn_start", Step: e.Step})
667 case core.EvToolCall:
668 mgr.EmitEvent(extproto.EventFromHost{
669 Event: "tool_call", ToolID: e.ID, ToolName: e.Name, ToolArgs: e.Args,
670 })
671 case core.EvAssistantMessage:
672 // Concat the visible text portions of the message; binary
673 // blocks (tool_use, etc.) are skipped because subscribers
674 // usually want a string they can grep / display.
675 var text string
676 for _, c := range e.Message.Content {
677 if tb, ok := c.(provider.TextBlock); ok {
678 text += tb.Text
679 }
680 }
681 mgr.EmitEvent(extproto.EventFromHost{Event: "assistant_message", Text: text})
682 case core.EvTurnEnd:
683 ev := extproto.EventFromHost{Event: "turn_end", Stop: string(e.Stop)}
684 if e.Err != nil {
685 ev.Error = e.Err.Error()
686 }
687 mgr.EmitEvent(ev)
688 }
689}
690
691// Run is the top-level entrypoint for the zut binary.
692func Run(rawArgs []string, version string) error {
693 // Extension installs can invoke external build and clone processes.
694 // Give those processes a cancellation context without changing signal
695 // handling for the interactive modes below.
696 extCtx := context.Background()
697 stopExtContext := func() {}
698 if len(rawArgs) > 0 && rawArgs[0] == "ext" {
699 extCtx, stopExtContext = signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
700 }
701 defer stopExtContext()
702
703 // Subcommand router: `zut bot ...` is handled separately so the
704 // generic flag parser doesn't reject "bot" as a positional arg.
705 if handled, err := runBotCommand(rawArgs, version); handled {
706 return err
707 }
708 if handled, err := runExtCommand(extCtx, rawArgs, version); handled {
709 return err
710 }
711 if handled, err := runUpdateCommand(rawArgs, version); handled {
712 return err
713 }
714 if handled, err := runZutfileCommand(rawArgs, version); handled {
715 return err
716 }
717 return runWithArgsRaw(rawArgs, version)
718}
719
720func runWithArgsRaw(rawArgs []string, version string) error {
721 // `zut rpc` is shorthand for `zut --rpc` so third-party apps can
722 // spawn the binary with a clean argv. Strip the leading 'rpc'
723 // token and let the rest flow through the normal arg parser.
724 if len(rawArgs) > 0 && rawArgs[0] == "rpc" {
725 rawArgs = append([]string{"--rpc"}, rawArgs[1:]...)
726 }
727
728 args, err := ParseArgs(rawArgs)
729 if err != nil {
730 PrintHelp(version)
731 return err
732 }
733 if args.Help {
734 PrintHelp(version)
735 return nil
736 }
737 if args.Version {
738 fmt.Println("zut", version)
739 return nil
740 }
741 // Model catalog: load any cached discovery data before we inspect
742 // the model list (list-models, print/json, interactive).
743 prepareRuntimeCatalog()
744
745 if args.ListModels {
746 printModels()
747 return nil
748 }
749
750 return runWithArgs(args, version)
751}
752
753func runWithArgs(args Args, version string) error {
754 ctx := context.Background()
755 switch args.Mode {
756 case ModePrint:
757 return runPrintMode(ctx, args, version)
758 case ModeStream:
759 return runStreamMode(ctx, args, version)
760 case ModeJSON:
761 return runJSONMode(ctx, args, version)
762 case ModeRPC:
763 return runRPCMode(ctx, args, version)
764 case ModeSubagentWorker:
765 return runSubagentWorkerMode(ctx, args, version)
766 default:
767 return runInteractive(ctx, args, version)
768 }
769}
770
771// ---- print / json modes: require credentials, run single-shot ----
772
773// nonInteractiveExtHooks is the HostHooks impl used by print / json
774// modes. They have no TUI, so notify / display go to stderr and
775// submit / insert are no-ops (the extension can't steer a
776// single-shot run once it's in flight anyway).
777type nonInteractiveExtHooks struct{}
778
779func (nonInteractiveExtHooks) Notify(ext, level, message string) {
780 fmt.Fprintf(os.Stderr, "[%s] %s: %s\n", ext, level, message)
781}
782func (nonInteractiveExtHooks) Alert(string, extproto.AlertRequest) {}
783func (nonInteractiveExtHooks) Submit(string) {}
784func (nonInteractiveExtHooks) SubmitSlash(string) {}
785func (nonInteractiveExtHooks) Insert(string) {}
786func (nonInteractiveExtHooks) Display(string, string) {}
787func (nonInteractiveExtHooks) ClearNotes(string) {}
788func (nonInteractiveExtHooks) OpenPanel(string, extproto.PanelSpec) {}
789func (nonInteractiveExtHooks) UpdatePanel(string, string, string, []string, string) {}
790func (nonInteractiveExtHooks) ClosePanel(string, string) {}
791func (nonInteractiveExtHooks) SetStatus(string, string, string, string) {}
792func (nonInteractiveExtHooks) SetWidget(string, string, string, string, []string) {}
793func (nonInteractiveExtHooks) ClearWidget(string, string) {}
794
795// setupNonInteractiveExtensions loads --ext paths and (unless
796// --no-ext) runs discovery. Returns the manager so the caller can
797// wire tools into the resolved registry, and a cleanup closure to
798// defer. Mirrors the interactive-mode setup minus the TUI hooks.
799func setupNonInteractiveExtensions(ctx context.Context, args Args, r *Resolved, version string) (*extensions.Manager, func()) {
800 extMgr := extensions.New(ZutHome(), r.CWD, version, r.Provider, r.Model, nonInteractiveExtHooks{})
801 for _, e := range extMgr.LoadExplicit(ctx, args.Exts) {
802 fmt.Fprintln(os.Stderr, "extension load:", e)
803 }
804 if !args.NoExt {
805 for _, e := range extMgr.Discover(ctx) {
806 fmt.Fprintln(os.Stderr, "extension load:", e)
807 }
808 }
809 extMgr.WaitForReady(3 * time.Second)
810 r.MergeExtensionTools(&extToolAdapter{mgr: extMgr})
811 return extMgr, func() { extMgr.Stop(2 * time.Second) }
812}
813
814// wireNonInteractiveAgentExtHooks installs the same BeforeToolExecute
815// / BeforeTurn / BeforeAssistantMessage / OnEvent hooks the
816// interactive path wires up, so extensions get their normal
817// event-intercept surface in print / json / rpc flows too.
818func wireNonInteractiveAgentExtHooks(ctx context.Context, ag *core.Agent, extMgr *extensions.Manager) {
819 if ag == nil || extMgr == nil {
820 return
821 }
822 ag.BeforeToolExecute = func(call provider.ToolCallBlock) (bool, string, json.RawMessage) {
823 res := extMgr.InterceptToolCall(ctx, call.ID, call.Name, call.Arguments)
824 if res.Block {
825 return false, res.Reason, nil
826 }
827 return true, "", res.ModifiedArgs
828 }
829 ag.BeforeTurnContext = func(turnCtx context.Context, step int) (bool, string, string) {
830 res := extMgr.InterceptTurnStart(turnCtx, step)
831 return !res.Block, res.Reason, res.Context
832 }
833 ag.BeforeAssistantMessage = func(text string) (bool, string, string) {
834 res := extMgr.InterceptAssistantMessage(ctx, text)
835 if res.Block {
836 return false, res.Reason, ""
837 }
838 return true, "", res.ReplaceText
839 }
840 ag.OnEvent = func(ev core.AgentEvent) { fanoutAgentEvent(extMgr, ev) }
841}
842
843type printStats struct {
844 Provider string `json:"provider"`
845 Model string `json:"model"`
846 PromptTokens int `json:"prompt_tokens"`
847 ReasoningTokens *int `json:"reasoning_tokens"`
848 GeneratedOutputTokens int `json:"generated_output_tokens"`
849 ElapsedMS int64 `json:"elapsed_ms"`
850}
851
852func writePrintStats(path, providerID, model string, usage provider.Usage, elapsed time.Duration) error {
853 var reasoning *int
854 generated := usage.OutputTokens
855 if usage.ReasoningTokensKnown {
856 count := usage.ReasoningTokens
857 reasoning = &count
858 generated -= count
859 if generated < 0 {
860 generated = 0
861 }
862 }
863 stats := printStats{
864 Provider: providerID,
865 Model: model,
866 PromptTokens: usage.InputTokens + usage.CacheReadTokens + usage.CacheWriteTokens,
867 ReasoningTokens: reasoning,
868 GeneratedOutputTokens: generated,
869 ElapsedMS: elapsed.Milliseconds(),
870 }
871 data, err := json.MarshalIndent(stats, "", " ")
872 if err != nil {
873 return fmt.Errorf("encode stats: %w", err)
874 }
875 data = append(data, '\n')
876 if err := os.WriteFile(path, data, 0o644); err != nil {
877 return fmt.Errorf("write stats %q: %w", path, err)
878 }
879 return nil
880}
881
882func runPrintMode(ctx context.Context, args Args, version string) error {
883 if args.NoYolo {
884 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in print mode (no interactive prompt available); tools will run without confirmation")
885 }
886 r, err := Resolve(args, true)
887 if err != nil {
888 return err
889 }
890 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
891 defer stopExt()
892
893 ag := r.NewAgent()
894 initialAg := ag
895 defer func() {
896 closeAgentLSP(ag)
897 if ag != initialAg {
898 closeAgentLSP(initialAg)
899 }
900 }()
901 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
902 sess, err := openOrCreateSession(args, r, ag, version)
903 if err != nil {
904 return err
905 }
906 if sess != nil {
907 var providerName, model string
908 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
909 if err != nil {
910 return err
911 }
912 r.Provider, r.Model = providerName, model
913 ag.OnToolResult = func(_ string, result core.ToolResult) { persistExtensionToolResult(extMgr, sess, result) }
914 defer sess.Close()
915 }
916 announceSession(extMgr, sess)
917
918 prompt := args.Prompt
919 if prompt == "" {
920 piped, _ := readAllStdin()
921 prompt = strings.TrimSpace(piped)
922 }
923 if prompt == "" {
924 return fmt.Errorf("print mode requires a prompt (arg or stdin)")
925 }
926
927 start := len(ag.Messages())
928 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, nil, os.Stderr); err != nil {
929 return err
930 }
931 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
932 return err
933 }
934 started := time.Now()
935 usage, err := modes.RunPrint(ctx, ag, prompt, nil, os.Stdout)
936 elapsed := time.Since(started)
937 WriteNewTranscript(ag, sess, start)
938 if err != nil {
939 return err
940 }
941 if args.StatsPath != "" {
942 return writePrintStats(args.StatsPath, r.Provider, r.Model, usage, elapsed)
943 }
944 return nil
945}
946
947func runStreamMode(ctx context.Context, args Args, version string) error {
948 if args.NoYolo {
949 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in stream mode (no interactive prompt available); tools will run without confirmation")
950 }
951 r, err := Resolve(args, true)
952 if err != nil {
953 return err
954 }
955 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
956 defer stopExt()
957
958 ag := r.NewAgent()
959 initialAg := ag
960 defer func() {
961 closeAgentLSP(ag)
962 if ag != initialAg {
963 closeAgentLSP(initialAg)
964 }
965 }()
966 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
967 sess, err := openOrCreateSession(args, r, ag, version)
968 if err != nil {
969 return err
970 }
971 if sess != nil {
972 var providerName, model string
973 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
974 if err != nil {
975 return err
976 }
977 r.Provider, r.Model = providerName, model
978 ag.OnToolResult = func(_ string, result core.ToolResult) { persistExtensionToolResult(extMgr, sess, result) }
979 defer sess.Close()
980 }
981 announceSession(extMgr, sess)
982
983 prompt := args.Prompt
984 if prompt == "" {
985 piped, _ := readAllStdin()
986 prompt = strings.TrimSpace(piped)
987 }
988 if prompt == "" {
989 return fmt.Errorf("stream mode requires a prompt (arg or stdin)")
990 }
991
992 start := len(ag.Messages())
993 preSink, finishPre := newStreamTextSink(os.Stdout)
994 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, preSink, os.Stderr); err != nil {
995 finishPre()
996 return err
997 }
998 finishPre()
999 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
1000 return err
1001 }
1002 err = modes.RunStream(ctx, ag, prompt, nil, os.Stdout)
1003 WriteNewTranscript(ag, sess, start)
1004 return err
1005}
1006
1007func newStreamTextSink(out io.Writer) (func(core.AgentEvent), func()) {
1008 var streamed, wroteText, lastWasNL bool
1009 writeText := func(text string) {
1010 if text == "" {
1011 return
1012 }
1013 _, _ = fmt.Fprint(out, text)
1014 if syncer, ok := out.(interface{ Sync() error }); ok {
1015 _ = syncer.Sync()
1016 }
1017 wroteText = true
1018 lastWasNL = strings.HasSuffix(text, "\n")
1019 }
1020 sink := func(ev core.AgentEvent) {
1021 switch e := ev.(type) {
1022 case core.EvAssistantStart:
1023 streamed = false
1024 case core.EvTextDelta:
1025 streamed = true
1026 writeText(e.Delta)
1027 case core.EvAssistantMessage:
1028 if streamed {
1029 return
1030 }
1031 var text strings.Builder
1032 for _, content := range e.Message.Content {
1033 if block, ok := content.(provider.TextBlock); ok {
1034 if text.Len() > 0 {
1035 text.WriteString("\n")
1036 }
1037 text.WriteString(block.Text)
1038 }
1039 }
1040 writeText(text.String())
1041 }
1042 }
1043 finish := func() {
1044 if wroteText && !lastWasNL {
1045 writeText("\n")
1046 }
1047 }
1048 return sink, finish
1049}
1050
1051func runJSONMode(ctx context.Context, args Args, version string) error {
1052 if args.NoYolo {
1053 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in json mode (no interactive prompt available); tools will run without confirmation")
1054 }
1055 r, err := Resolve(args, true)
1056 if err != nil {
1057 return err
1058 }
1059 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
1060 defer stopExt()
1061
1062 ag := r.NewAgent()
1063 initialAg := ag
1064 defer func() {
1065 closeAgentLSP(ag)
1066 if ag != initialAg {
1067 closeAgentLSP(initialAg)
1068 }
1069 }()
1070 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
1071 sess, err := openOrCreateSession(args, r, ag, version)
1072 if err != nil {
1073 return err
1074 }
1075 if sess != nil {
1076 var providerName, model string
1077 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
1078 if err != nil {
1079 return err
1080 }
1081 r.Provider, r.Model = providerName, model
1082 ag.OnToolResult = func(_ string, result core.ToolResult) { persistExtensionToolResult(extMgr, sess, result) }
1083 defer sess.Close()
1084 }
1085 announceSession(extMgr, sess)
1086
1087 prompt := args.Prompt
1088 if prompt == "" {
1089 piped, _ := readAllStdin()
1090 prompt = strings.TrimSpace(piped)
1091 }
1092 if prompt == "" {
1093 return fmt.Errorf("json mode requires a prompt (arg or stdin)")
1094 }
1095
1096 start := len(ag.Messages())
1097 enc := json.NewEncoder(os.Stdout)
1098 preSink := func(ev core.AgentEvent) {
1099 _ = enc.Encode(modes.EventToJSON(ev))
1100 }
1101 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, preSink, os.Stderr); err != nil {
1102 _ = enc.Encode(map[string]any{"type": "error", "message": err.Error()})
1103 return err
1104 }
1105 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
1106 _ = enc.Encode(map[string]any{"type": "error", "message": err.Error()})
1107 return err
1108 }
1109 err = modes.RunJSON(ctx, ag, prompt, nil, os.Stdout)
1110 WriteNewTranscript(ag, sess, start)
1111 return err
1112}
1113
1114// runZutfileStartupPre runs entry.pre before the main non-interactive prompt.
1115// "!command" values execute via BashTool; other values are sent as an agent turn.
1116// shellOut receives live shell chunks (typically os.Stderr); sink receives
1117// agent events for plain-text pre (stream mode wires a live text sink).
1118func runZutfileStartupPre(ctx context.Context, pre, cwd string, sandbox *tools.Sandbox, ag *core.Agent, sink func(core.AgentEvent), shellOut io.Writer) error {
1119 pre = strings.TrimSpace(pre)
1120 if pre == "" {
1121 return nil
1122 }
1123 if cmd, ok := modes.ShellEscapeCommand(pre); ok {
1124 raw, err := json.Marshal(map[string]any{"command": cmd})
1125 if err != nil {
1126 return err
1127 }
1128 if shellOut != nil {
1129 fmt.Fprintf(shellOut, "$ %s\n", cmd)
1130 if f, ok := shellOut.(interface{ Sync() error }); ok {
1131 _ = f.Sync()
1132 }
1133 }
1134 progress := func(chunk string) {
1135 if shellOut == nil || chunk == "" {
1136 return
1137 }
1138 fmt.Fprint(shellOut, chunk)
1139 if f, ok := shellOut.(interface{ Sync() error }); ok {
1140 _ = f.Sync()
1141 }
1142 }
1143 bash := &tools.BashTool{CWD: cwd, Sandbox: sandbox}
1144 res, err := bash.Execute(ctx, raw, progress)
1145 if err != nil {
1146 return fmt.Errorf("zutfile entry.pre: %w", err)
1147 }
1148 if res.IsError {
1149 var sb strings.Builder
1150 for _, c := range res.Content {
1151 if tb, ok := c.(provider.TextBlock); ok {
1152 sb.WriteString(tb.Text)
1153 }
1154 }
1155 msg := strings.TrimSpace(sb.String())
1156 if msg == "" {
1157 msg = "command failed"
1158 }
1159 return fmt.Errorf("zutfile entry.pre: %s", msg)
1160 }
1161 return nil
1162 }
1163 if ag == nil {
1164 return fmt.Errorf("zutfile entry.pre requires an agent for non-shell prompts")
1165 }
1166 if sink == nil {
1167 sink = func(core.AgentEvent) {}
1168 }
1169 return ag.Prompt(ctx, pre, nil, sink)
1170}
1171
1172var errInteractiveAgentChanged = errors.New("interactive agent changed during prompt refresh")
1173
1174// refreshAgentToolsAndPrompt re-resolves tools (including rediscovered
1175// skills and currently loaded extension tools) and updates the live
1176// agent's registry and system prompt. Used after /reload-ext and after
1177// zutfile entry.pre installs new skills or extensions.
1178// mutateRegistry, if non-nil, can inject session-specific tools (e.g. subagent_spawn).
1179// interactive, when non-nil, serializes the final commit with agent replacement.
1180func refreshAgentToolsAndPrompt(args Args, sharedSandbox *tools.Sandbox, extToolAdapter ExtensionToolSource, ag *core.Agent, mutateRegistry func(core.Registry) core.Registry, interactive *modes.Interactive) error {
1181 if ag == nil {
1182 return nil
1183 }
1184 resolved, err := Resolve(args, true)
1185 if err != nil {
1186 return fmt.Errorf("refresh agent prompt and tools: %w", err)
1187 }
1188 if sharedSandbox != nil {
1189 resolved.UseSandbox(sharedSandbox)
1190 }
1191 if extToolAdapter != nil {
1192 resolved.MergeExtensionTools(extToolAdapter)
1193 }
1194 reg := resolved.ToolRegistry
1195 if mutateRegistry != nil {
1196 reg = mutateRegistry(reg)
1197 }
1198 if interactive != nil {
1199 oldTools, applied := interactive.ApplyAgentPromptConfig(ag, resolved.SystemPrompt, reg)
1200 if !applied {
1201 _ = tools.CloseLSPManagers(reg)
1202 return errInteractiveAgentChanged
1203 }
1204 interactive.DeferUntilIdle(func() {
1205 _ = tools.CloseLSPManagers(oldTools)
1206 })
1207 return nil
1208 }
1209 oldTools := ag.SetPromptConfig(resolved.SystemPrompt, reg)
1210 _ = tools.CloseLSPManagers(oldTools)
1211 return nil
1212}
1213
1214// reloadResourcesAfterStartupPre reloads extensions (if any) and
1215// refreshes the agent tool registry + system prompt so skills/extensions
1216// installed by entry.pre are visible to the following turn.
1217func reloadResourcesAfterStartupPre(ctx context.Context, args Args, extMgr *extensions.Manager, sharedSandbox *tools.Sandbox, ag *core.Agent) error {
1218 if strings.TrimSpace(args.StartupPre) == "" || ag == nil {
1219 return nil
1220 }
1221 adapter := &extToolAdapter{mgr: extMgr}
1222 if extMgr != nil {
1223 _ = extMgr.Reload(ctx, 2*time.Second)
1224 }
1225 return refreshAgentToolsAndPrompt(args, sharedSandbox, adapter, ag, nil, nil)
1226}
1227
1228// ---- interactive mode: opens the TUI even without credentials ----
1229
1230func subagentPolicyFromConfig(cfg SubagentsConfig) subagents.SubagentPolicy {
1231 parseDuration := func(value string) time.Duration {
1232 if strings.TrimSpace(value) == "" {
1233 return 0
1234 }
1235 parsed, err := time.ParseDuration(strings.TrimSpace(value))
1236 if err != nil || parsed <= 0 {
1237 return 0
1238 }
1239 return parsed
1240 }
1241 return subagents.SubagentPolicy{
1242 MaxConcurrent: cfg.MaxConcurrent,
1243 MaxConcurrentPerParent: cfg.MaxConcurrentPerParent,
1244 MaxTotalSpawned: cfg.MaxTotalSpawned,
1245 QueueTimeout: parseDuration(cfg.QueueTimeout),
1246 DefaultTimeout: parseDuration(cfg.DefaultTimeout),
1247 MaxTurns: cfg.MaxTurns,
1248 MaxOutputBytes: cfg.MaxOutputBytes,
1249 MaxOutputLines: cfg.MaxOutputLines,
1250 AllowedTools: append([]string(nil), cfg.AllowedTools...),
1251 AllowedRoots: append([]string(nil), cfg.AllowedRoots...),
1252 HeartbeatInterval: parseDuration(cfg.HeartbeatInterval),
1253 IdleTimeout: parseDuration(cfg.IdleTimeout),
1254 ReconnectTimeout: parseDuration(cfg.ReconnectTimeout),
1255 CancelGracePeriod: parseDuration(cfg.CancelGracePeriod),
1256 }
1257}
1258
1259func runInteractive(ctx context.Context, args Args, version string) error {
1260 initialCfg, _ := LoadConfig()
1261 // Resolve WITHOUT requiring credentials.
1262 r, err := Resolve(args, false)
1263 if err != nil {
1264 return err
1265 }
1266
1267 authStore := AuthStoreFor()
1268 mgr := auth.NewManager(authStore)
1269 defer mgr.Close()
1270
1271 // Keep the sandbox pointer stable across agent rebuilds (login / model
1272 // switch). The Interactive UI toggles the lock via this pointer, and
1273 // rebuilt tool instances must share the same one so the lock sticks.
1274 sharedSandbox := r.Sandbox
1275
1276 // persistMu guards the active session and selection across the agent
1277 // loop, TUI callbacks, and session swaps. Declare it before tool
1278 // construction because subagent defaults must read the live selection too.
1279 var persistMu sync.Mutex
1280 // Serialize session transitions with persistence callbacks so a candidate
1281 // is read only after the old agent is flushed and cannot be overwritten by
1282 // an in-flight append before commit.
1283 var sessionTransitionMu sync.RWMutex
1284 activeProvider := r.Provider
1285 activeModel := r.Model
1286
1287 // Build the extension manager BEFORE the agent so we can fold
1288 // extension-defined tools into the registry. Attach the interactive
1289 // host after constructing it below so startup alerts can be buffered.
1290 var iv *modes.Interactive
1291 extHooks := &interactiveExtHooks{}
1292 extMgr := extensions.New(ZutHome(), r.CWD, version, r.Provider, r.Model, extHooks)
1293 var startupExtensionErrors []string
1294 // --ext paths first so they win against installed extensions of
1295 // the same name (loadOne's first-write-wins semantics).
1296 for _, e := range extMgr.LoadExplicit(ctx, args.Exts) {
1297 startupExtensionErrors = append(startupExtensionErrors, e.Error())
1298 }
1299 // --no-ext skips the global + project-local discovery scan;
1300 // explicit --ext paths above are still honoured so you can run
1301 // "only this extension" with --no-ext --ext ./x.
1302 if !args.NoExt {
1303 for _, e := range extMgr.Discover(ctx) {
1304 startupExtensionErrors = append(startupExtensionErrors, e.Error())
1305 }
1306 }
1307 // Wait briefly for extensions to flush their initial register_tool
1308 // frames before we build the agent's tool registry. Half a second
1309 // is plenty for any extension that's actually well-behaved; ones
1310 // that don't send a ready frame eat the full grace and proceed.
1311 // 3s is the per-extension grace period for the ready frame.
1312 // Native binaries are instant; runtimes like `npx tsx` take ~1.5s
1313 // from cold cache. The wait is tight only for extensions that
1314 // haven't sent ready by then; ones that signalled earlier release
1315 // the wait immediately.
1316 extMgr.WaitForReady(3 * time.Second)
1317 defer extMgr.Stop(2 * time.Second)
1318
1319 extToolAdapter := &extToolAdapter{mgr: extMgr}
1320 r.MergeExtensionTools(extToolAdapter)
1321
1322 // Build the subagent supervisor BEFORE the agent so the auto-subagents
1323 // tool can reference it during tool-registry construction. State
1324 // lives under ZutHome/subagents so per-agent meta/events survive
1325 // restarts; the user can hunt orphaned agents down with
1326 // `git worktree list` if anything misbehaves.
1327 //
1328 // subagentsMgr is also captured by loadSession / changeCWD closures
1329 // further down the function, which is why we keep the variable
1330 // in this outer scope rather than scoping it tighter.
1331 var subagentsMgr *subagents.Supervisor
1332 subagentsMgr = subagents.New(subagents.Config{
1333 Context: ctx,
1334 Root: filepath.Join(ZutHome(), "subagents"),
1335 RepoRoot: r.CWD,
1336 Provider: r.Provider,
1337 FastMode: r.FastMode,
1338 BaseURL: r.BaseURL,
1339 InsecureTLS: r.InsecureTLS,
1340 Policy: subagentPolicyFromConfig(initialCfg.Subagents),
1341 // Keep an explicit launch key in this callback only. Supervisor persists
1342 // connection settings, but never stores credentials in Agent metadata
1343 // or puts them in the worker's argv/environment.
1344 ResolveCredential: func(ctx context.Context, providerID string) (subagents.Credential, error) {
1345 childProvider := canonicalProvider(providerID)
1346 persistMu.Lock()
1347 hostProvider := canonicalProvider(activeProvider)
1348 persistMu.Unlock()
1349 if childProvider == "" {
1350 childProvider = hostProvider
1351 }
1352 explicit := ""
1353 // A launch-time API key is scoped to the provider selected at
1354 // startup. Never send it to an explicitly different child
1355 // provider; resolve that provider's own credential instead.
1356 if args.APIKey != "" && childProvider == hostProvider {
1357 explicit = args.APIKey
1358 }
1359 if childProvider == "ollama" && explicit == "" {
1360 return subagents.Credential{Value: "ollama", Method: "apikey"}, nil
1361 }
1362 credential, method, accountID, err := ResolveCredentialFullContext(ctx, childProvider, explicit)
1363 if err != nil {
1364 // Providers backed only by a local endpoint do not need a key.
1365 // Leave stdin untouched and let the child resolve that endpoint.
1366 if !CredentialAvailable(childProvider) {
1367 return subagents.Credential{}, nil
1368 }
1369 return subagents.Credential{}, err
1370 }
1371 return subagents.Credential{Value: credential, Method: method, AccountID: accountID}, nil
1372 },
1373 })
1374 // Pull any previously-spawned agents off disk so the dashboard
1375 // shows them as detached and the user can resume / remove them.
1376 _, _ = subagentsMgr.Reload()
1377 if args.PermissionSet != nil {
1378 // Packaged zutfile agents have an explicit capability ceiling. A
1379 // child process would otherwise rebuild a fresh unrestricted sandbox,
1380 // so do not expose either slash or tool-based delegation from this
1381 // restricted host until worker capability propagation exists.
1382 subagentsMgr = nil
1383 }
1384
1385 // onSpawnedSupervisor is the OnSpawned callback the subagent_spawn tool
1386 // fires after every successful spawn. It hands the agent off to
1387 // the running Interactive so the watcher can flush a summary back
1388 // into chat when all sub-agents finish. Reads `iv` lazily because
1389 // the Interactive is constructed after the agent.
1390 onSpawnedSupervisor := func(a *subagents.Agent, task string) {
1391 if iv != nil {
1392 iv.TrackSubagentWorker(a, task)
1393 }
1394 }
1395 resolveSubagent := func(name string) (*subagents.Profile, error) {
1396 return findSubagentProfile(r.CWD, name)
1397 }
1398
1399 // Inject the auto-subagent tools only when /settings -> auto-subagents
1400 // is currently enabled. Registering them unconditionally leaves the model
1401 // trying to call them (and getting a polite error) even when the user has
1402 // switched the feature off. The /settings toggle live-mutates the running
1403 // agent's registry separately so flipping the flag mid-session takes effect
1404 // on the next turn.
1405 injectSubagentTools := func(reg core.Registry) core.Registry {
1406 if reg == nil || subagentsMgr == nil || !autoSubagentsAnyToolAllowed(args) {
1407 return reg
1408 }
1409 if !AutoSubagentsEnabled() {
1410 return reg
1411 }
1412 if autoSubagentsToolAllowed(args) {
1413 canonical := &tools.SubagentSpawnTool{
1414 Supervisor: subagentsMgr,
1415 Enabled: AutoSubagentsEnabled,
1416 DefaultModel: func() string {
1417 persistMu.Lock()
1418 defer persistMu.Unlock()
1419 return activeModel
1420 },
1421 DefaultProvider: func() string {
1422 persistMu.Lock()
1423 defer persistMu.Unlock()
1424 return activeProvider
1425 },
1426 DefaultReasoning: func() string { return r.Reasoning },
1427 ResolveSubagent: resolveSubagent,
1428 OnSpawned: onSpawnedSupervisor,
1429 }
1430 reg[canonical.Name()] = canonical
1431 }
1432 if autoSubagentsStatusToolAllowed(args) {
1433 statusTool := &tools.SubagentStatusTool{
1434 Supervisor: subagentsMgr,
1435 Enabled: AutoSubagentsEnabled,
1436 }
1437 reg[statusTool.Name()] = statusTool
1438 }
1439 return reg
1440 }
1441 injectSubagentTools(r.ToolRegistry)
1442
1443 // Confirmation gate: when --no-yolo is on, the agent must ask
1444 // the user before every tool call. In interactive mode the TUI
1445 // provides the Confirmer; in print/json/rpc modes there's no
1446 // way to prompt, so the gate is constructed with a nil inner
1447 // which auto-refuses every call with a helpful reason.
1448 var confirmGate *core.ConfirmGate
1449 if args.NoYolo {
1450 confirmGate = core.NewConfirmGate(nil) // set below for interactive
1451 }
1452
1453 // Capture current args in a closure so BuildAgent can re-resolve
1454 // after a successful login (picks up the newly stored credential).
1455 wireAgentExt := func(a *core.Agent) *core.Agent {
1456 if a == nil {
1457 return a
1458 }
1459 a.BeforeToolExecute = func(call provider.ToolCallBlock) (bool, string, json.RawMessage) {
1460 // Guards run before confirmation because they may rewrite the
1461 // arguments. The user must approve the effective call that will
1462 // actually execute, not the model's original arguments.
1463 r := extMgr.InterceptToolCall(ctx, call.ID, call.Name, call.Arguments)
1464 if r.Block {
1465 return false, r.Reason, nil
1466 }
1467 effectiveArgs := call.Arguments
1468 if len(r.ModifiedArgs) > 0 && json.Valid(r.ModifiedArgs) {
1469 effectiveArgs = r.ModifiedArgs
1470 }
1471 if confirmGate != nil {
1472 var content strings.Builder
1473 _, currentTools := a.PromptConfig()
1474 if tool, err := currentTools.Get(call.Name); err == nil {
1475 if previewer, ok := tool.(core.ToolPreviewer); ok {
1476 preview, err := previewer.Preview(ctx, effectiveArgs)
1477 if err != nil {
1478 return false, err.Error(), nil
1479 }
1480 for _, block := range preview.Content {
1481 if text, ok := block.(provider.TextBlock); ok {
1482 if content.Len() > 0 {
1483 content.WriteString("\n")
1484 }
1485 content.WriteString(text.Text)
1486 }
1487 }
1488 }
1489 }
1490 ok, reason, _ := confirmGate.CheckToolCall(core.ToolCallConfirmation{
1491 ID: call.ID,
1492 Name: call.Name,
1493 Summary: core.BuildPreview(effectiveArgs, 120),
1494 Content: content.String(),
1495 Origin: call.Origin,
1496 })
1497 if !ok {
1498 return false, reason, nil
1499 }
1500 }
1501 return true, "", r.ModifiedArgs
1502 }
1503 a.BeforeTurnContext = func(turnCtx context.Context, step int) (bool, string, string) {
1504 r := extMgr.InterceptTurnStart(turnCtx, step)
1505 return !r.Block, r.Reason, r.Context
1506 }
1507 a.BeforeAssistantMessage = func(text string) (bool, string, string) {
1508 r := extMgr.InterceptAssistantMessage(ctx, text)
1509 if r.Block {
1510 return false, r.Reason, ""
1511 }
1512 return true, "", r.ReplaceText
1513 }
1514 a.OnEvent = func(ev core.AgentEvent) { fanoutAgentEvent(extMgr, ev) }
1515 return a
1516 }
1517
1518 var ag *core.Agent
1519 buildAgent := func() (*core.Agent, string, string, error) {
1520 resolved, err := Resolve(args, true)
1521 if err != nil {
1522 return nil, "", "", err
1523 }
1524 resolved.UseSandbox(sharedSandbox)
1525 if subagentsMgr != nil {
1526 subagentsMgr.SetProvider(resolved.Provider)
1527 subagentsMgr.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1528 }
1529 resolved.MergeExtensionTools(extToolAdapter)
1530 injectSubagentTools(resolved.ToolRegistry)
1531 return wireAgentExt(resolved.NewAgent()), resolved.Provider, resolved.Model, nil
1532 }
1533
1534 // Rebuild agent with an explicit provider/model override.
1535 buildAgentFor := func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1536 next := args
1537 if providerOverride != "" {
1538 next.Provider = providerOverride
1539 }
1540 if modelOverride != "" {
1541 next.Model = modelOverride
1542 }
1543 resolved, err := Resolve(next, true)
1544 if err != nil {
1545 return nil, "", "", err
1546 }
1547 resolved.UseSandbox(sharedSandbox)
1548 if subagentsMgr != nil {
1549 subagentsMgr.SetProvider(resolved.Provider)
1550 subagentsMgr.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1551 }
1552 resolved.MergeExtensionTools(extToolAdapter)
1553 injectSubagentTools(resolved.ToolRegistry)
1554 return wireAgentExt(resolved.NewAgent()), resolved.Provider, resolved.Model, nil
1555 }
1556
1557 // Rebuild agent for the rescue picker after a recoverable failure.
1558 // Unlike buildAgentFor, this drops launch-time --api-key and
1559 // --base-url overrides because those are typically the cause of the
1560 // rescue (a bad key, a typo'd base URL, or a corporate gateway that
1561 // only the originally-picked provider needed). Re-resolving without
1562 // them lets the rescue retry use env vars / auth.json / provider
1563 // defaults the way zut would have without the overrides.
1564 buildAgentForRescue := func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1565 next := args
1566 next.APIKey = ""
1567 next.BaseURL = ""
1568 if providerOverride != "" {
1569 next.Provider = providerOverride
1570 }
1571 if modelOverride != "" {
1572 next.Model = modelOverride
1573 }
1574 resolved, err := Resolve(next, true)
1575 if err != nil {
1576 return nil, "", "", err
1577 }
1578 resolved.UseSandbox(sharedSandbox)
1579 if subagentsMgr != nil {
1580 subagentsMgr.SetProvider(resolved.Provider)
1581 subagentsMgr.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1582 }
1583 resolved.MergeExtensionTools(extToolAdapter)
1584 injectSubagentTools(resolved.ToolRegistry)
1585 return wireAgentExt(resolved.NewAgent()), resolved.Provider, resolved.Model, nil
1586 }
1587
1588 if r.HasCredential() {
1589 ag = wireAgentExt(r.NewAgent())
1590 }
1591
1592 // /reload-ext callback: after the manager has respawned every
1593 // extension, re-resolve the tool registry (built-ins + freshly-
1594 // registered extension tools) and swap it onto the current
1595 // agent in-place. The current agent may have been replaced by a
1596 // /model swap since spawn, so re-read the live `ag` on each
1597 // invocation.
1598 extMgr.SetOnReload(func() {
1599 current := liveInteractiveAgent(iv, ag)
1600 if current == nil {
1601 return
1602 }
1603 if err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, injectSubagentTools, iv); err != nil && iv != nil {
1604 iv.ReportError(err)
1605 }
1606 })
1607
1608 var sess *core.Session
1609 var sessBaselineMsgs int // messages already on disk when current session opened
1610 var sessionTitlePending bool
1611 if !args.NoSess && ag != nil {
1612 var sessErr error
1613 sess, sessErr = openOrCreateSession(args, r, ag, version)
1614 if sessErr != nil {
1615 return sessErr
1616 }
1617 sessBaselineMsgs = len(ag.Messages())
1618 if sess != nil {
1619 // Startup resume uses the same provider/model-aware preparation as
1620 // the interactive session picker. This matters for --continue,
1621 // --resume, and explicit --session paths whose latest meta row was
1622 // written by another provider/model.
1623 candidate, resumeErr := applySessionResume(sess, ag, r.Provider, r.Model,
1624 strings.TrimSpace(args.Provider) != "", strings.TrimSpace(args.Model) != "", buildAgentFor)
1625 if resumeErr != nil {
1626 return resumeErr
1627 }
1628 sess = candidate.session
1629 ag = candidate.agent
1630 sessBaselineMsgs = candidate.fullMessageCount
1631 activeProvider = candidate.provider
1632 activeModel = candidate.model
1633 r.Provider = candidate.provider
1634 r.Model = candidate.model
1635 }
1636 if sess != nil && ag != nil {
1637 sessionTitlePending = sess.Meta.Parent != "" && sess.Title == "" && len(ag.Messages()) <= sess.Meta.ForkPoint
1638 }
1639 }
1640 announceSession(extMgr, sess)
1641 defer func() {
1642 persistMu.Lock()
1643 defer persistMu.Unlock()
1644 if sess != nil {
1645 sess.Close()
1646 }
1647 }()
1648
1649 // persistMessage is the per-message hook bound to the agent. It
1650 // appends each new transcript message to the live session as soon
1651 // as it lands, so a kill / closed terminal / OS crash costs at
1652 // most the in-flight turn instead of the whole session. The
1653 // baseline counter advances in lock-step so the exit-time flush
1654 // doesn't double-write rows already on disk.
1655 persistMessage := func(m provider.Message) {
1656 sessionTransitionMu.RLock()
1657 defer sessionTransitionMu.RUnlock()
1658 persistMu.Lock()
1659 defer persistMu.Unlock()
1660 if sess == nil {
1661 return
1662 }
1663 if err := sess.AppendMessage(m); err == nil {
1664 sessBaselineMsgs++
1665 }
1666 }
1667 persistUsage := func(cum provider.Usage) {
1668 sessionTransitionMu.RLock()
1669 defer sessionTransitionMu.RUnlock()
1670 persistMu.Lock()
1671 defer persistMu.Unlock()
1672 if sess == nil {
1673 return
1674 }
1675 _ = sess.AppendUsage(cum, cum)
1676 }
1677 persistCompaction := func(messages []provider.Message) {
1678 sessionTransitionMu.RLock()
1679 var session *extproto.SessionContext
1680 var states map[string]json.RawMessage
1681 persistMu.Lock()
1682 if sess != nil {
1683 if err := sess.AppendCompaction(messages); err == nil {
1684 sessBaselineMsgs = len(messages)
1685 session = sessionContext(sess)
1686 states = copyExtensionStates(sess.ExtensionState)
1687 }
1688 }
1689 persistMu.Unlock()
1690 sessionTransitionMu.RUnlock()
1691 if session != nil {
1692 extMgr.EmitSessionEvent("session_compacted", session, states)
1693 }
1694 }
1695 persistToolResult := func(_ string, result core.ToolResult) {
1696 persistMu.Lock()
1697 defer persistMu.Unlock()
1698 persistExtensionToolResult(extMgr, sess, result)
1699 }
1700 wireAgentPersist := func(a *core.Agent) *core.Agent {
1701 if a == nil {
1702 return a
1703 }
1704 a.OnMessageAppended = persistMessage
1705 a.OnUsage = persistUsage
1706 a.OnTranscriptCompacted = persistCompaction
1707 a.OnToolResult = persistToolResult
1708 return a
1709 }
1710 wireAgentPersist(ag)
1711 defer func() {
1712 closeAgentLSP(liveInteractiveAgent(iv, ag))
1713 closeResolvedLSP(r)
1714 }()
1715
1716 // Re-wrap the build closures so any agent constructed by the TUI
1717 // (login, /model swap to a different provider) also gets the
1718 // persistence hooks. Without this, switching provider would
1719 // silently revert to the old in-memory-only behaviour. Selection state
1720 // is published by the successful transition itself, not by preparation.
1721 baseBuildAgent := buildAgent
1722 buildAgent = func() (*core.Agent, string, string, error) {
1723 a, p, m, err := baseBuildAgent()
1724 return wireAgentPersist(a), p, m, err
1725 }
1726 baseBuildAgentFor := buildAgentFor
1727 buildAgentFor = func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1728 a, p, m, err := baseBuildAgentFor(providerOverride, modelOverride)
1729 return wireAgentPersist(a), p, m, err
1730 }
1731 baseBuildAgentForRescue := buildAgentForRescue
1732 buildAgentForRescue = func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1733 a, p, m, err := baseBuildAgentForRescue(providerOverride, modelOverride)
1734 return wireAgentPersist(a), p, m, err
1735 }
1736
1737 // loadSession replaces the current session with the one at path and
1738 // hands its messages to the agent. Used by the /sessions picker.
1739 loadSession := func(path string) error {
1740 // Hold the transition lock from the pre-flush through the commit.
1741 // Persistence callbacks take the read side, so an active session
1742 // cannot be snapshotted before its lazy writes land or overwritten by
1743 // a callback while the candidate is being installed.
1744 sessionTransitionMu.Lock()
1745 defer sessionTransitionMu.Unlock()
1746
1747 currentAg := liveInteractiveAgent(iv, ag)
1748 if currentAg == nil {
1749 return fmt.Errorf("no agent running; log in first")
1750 }
1751
1752 persistMu.Lock()
1753 currentProvider := activeProvider
1754 currentModel := activeModel
1755 oldSess := sess
1756 // Flush before reading the candidate. Use the locked form rather
1757 // than the public callback, which would acquire the read lock held
1758 // by this transition.
1759 if oldSess != nil {
1760 writeNewTranscriptLocked(currentAg, oldSess, sessBaselineMsgs)
1761 }
1762 currentMessageCount := len(currentAg.Messages())
1763 currentCost := currentAg.Cost()
1764 persistMu.Unlock()
1765
1766 // A candidate build must not publish its provider/model as the live
1767 // selection before the candidate commits.
1768 candidate, err := prepareSessionResume(path, currentAg, currentProvider, currentModel, baseBuildAgentFor)
1769 if err != nil {
1770 // prepareSessionResume closes its append handle on failure;
1771 // no live agent or session has been changed.
1772 return err
1773 }
1774 committed := false
1775 defer func() {
1776 if !committed {
1777 _ = candidate.session.Close()
1778 }
1779 }()
1780
1781 // Wire the private candidate before it can become visible. This is
1782 // also required for legacy same-provider resumes, where the current
1783 // agent is reused and only its transcript/usage are refreshed.
1784 wireAgentPersist(candidate.agent)
1785
1786 persistMu.Lock()
1787 // A provider rebuild ran outside persistMu. Refuse to install it if
1788 // the live agent, session, selection, transcript, or cost changed in
1789 // the meantime; otherwise a slow resume could discard a newer turn or
1790 // model swap.
1791 live := liveInteractiveAgent(iv, ag)
1792 changed := sess != oldSess || activeProvider != currentProvider || activeModel != currentModel || live != currentAg
1793 if !changed && live != nil {
1794 changed = len(live.Messages()) != currentMessageCount || live.Cost() != currentCost
1795 }
1796 if changed {
1797 persistMu.Unlock()
1798 return fmt.Errorf("session changed while loading; please try again")
1799 }
1800 newStates := copyExtensionStates(candidate.session.ExtensionState)
1801 if oldSess != nil {
1802 _ = oldSess.Close()
1803 }
1804 sess = candidate.session
1805 sessionTitlePending = candidate.session != nil && candidate.session.Meta.Parent != "" && candidate.session.Title == "" && candidate.fullMessageCount <= candidate.session.Meta.ForkPoint
1806 // The live agent only receives a compact resume window, but the
1807 // session file remains intact. Keep the persistence baseline at
1808 // the original on-disk message count so future turns append after
1809 // the full session instead of duplicating the hydrated tail.
1810 sessBaselineMsgs = candidate.fullMessageCount
1811
1812 if candidate.rebuilt {
1813 // Commit the TUI agent while persistMu still protects the session
1814 // writer, so no new message can land on the old file between the
1815 // two state changes.
1816 if iv != nil {
1817 iv.ApplySessionAgent(candidate.agent, candidate.provider, candidate.model)
1818 }
1819 ag = candidate.agent
1820 } else {
1821 currentAg.SetMessages(candidate.messages)
1822 currentAg.SeedCost(candidate.cumulative)
1823 currentAg.SeedLastTurnUsage(candidate.lastTurn)
1824 ag = currentAg
1825 }
1826 activeProvider = candidate.provider
1827 activeModel = candidate.model
1828 if subagentsMgr != nil && candidate.session != nil {
1829 // Keep the dashboard scope in the same commit as the session,
1830 // agent, usage, and persistence baseline.
1831 if iv != nil {
1832 iv.SetSubagentSessionScope(candidate.session.ID)
1833 } else {
1834 subagentsMgr.SetActiveSession(candidate.session.ID)
1835 }
1836 }
1837 committed = true
1838 persistMu.Unlock()
1839 if candidate.session.Meta.Parent != "" {
1840 extMgr.EmitSessionEvent("session_forked", sessionContext(candidate.session), newStates)
1841 }
1842 extMgr.EmitSessionEvent("session_switched", sessionContext(candidate.session), newStates)
1843 return nil
1844 }
1845
1846 // changeCWD switches the running session to a new working directory.
1847 // Wired into InteractiveConfig.ChangeCWD and invoked by the hidden
1848 // /cd slash command (which itself is only fired by the workspaces
1849 // extension's panel-key Enter handler today; the user can type /cd
1850 // directly but it's not in autocomplete / help / the README).
1851 //
1852 // Steps, in order:
1853 // 1. resolve + validate the new path (~ expansion, abs/rel)
1854 // 2. stage the candidate cwd, sandbox, and subagent state
1855 // 3. rebuild the agent and allocate its new session
1856 // 4. commit all new state together, closing the old session last
1857 // 5. push the committed state into the running Interactive
1858 //
1859 // The /jail state is preserved verbatim: if the sandbox was locked
1860 // to the old cwd, it stays locked, just re-pointed at the new one.
1861 changeCWD := func(path string) error {
1862 sessionTransitionMu.Lock()
1863 defer sessionTransitionMu.Unlock()
1864 if path == "" {
1865 return fmt.Errorf("empty path")
1866 }
1867 // ~ expansion.
1868 if path == "~" || strings.HasPrefix(path, "~/") {
1869 home, herr := os.UserHomeDir()
1870 if herr != nil || home == "" {
1871 return fmt.Errorf("cannot expand ~: %v", herr)
1872 }
1873 if path == "~" {
1874 path = home
1875 } else {
1876 path = filepath.Join(home, path[2:])
1877 }
1878 }
1879 if !filepath.IsAbs(path) {
1880 path = filepath.Join(args.CWD, path)
1881 }
1882 absPath, err := filepath.Abs(path)
1883 if err != nil {
1884 return err
1885 }
1886 info, err := os.Stat(absPath)
1887 if err != nil {
1888 return err
1889 }
1890 if !info.IsDir() {
1891 return fmt.Errorf("not a directory: %s", absPath)
1892 }
1893
1894 currentAg := liveInteractiveAgent(iv, ag)
1895 if currentAg == nil {
1896 return fmt.Errorf("no agent running; log in first")
1897 }
1898
1899 // Stage the candidate state while retaining a complete rollback
1900 // snapshot. A failed rebuild or session allocation must leave the
1901 // current agent, session, sandbox, and subagent root usable.
1902 oldCWD := args.CWD
1903 oldResolvedCWD := r.CWD
1904 oldPermissionSet := args.PermissionSet
1905 persistMu.Lock()
1906 oldActiveProvider := activeProvider
1907 oldActiveModel := activeModel
1908 persistMu.Unlock()
1909 oldSupervisorRoot := ""
1910 if subagentsMgr != nil {
1911 oldSupervisorRoot = subagentsMgr.RepoRoot()
1912 }
1913 oldSandboxRoot := ""
1914 oldSandboxLocked := false
1915 if sharedSandbox != nil {
1916 oldSandboxRoot = sharedSandbox.Root
1917 oldSandboxLocked = sharedSandbox.Locked()
1918 }
1919 rollback := func() {
1920 args.CWD = oldCWD
1921 r.CWD = oldResolvedCWD
1922 args.PermissionSet = oldPermissionSet
1923 persistMu.Lock()
1924 activeProvider = oldActiveProvider
1925 activeModel = oldActiveModel
1926 persistMu.Unlock()
1927 if subagentsMgr != nil {
1928 subagentsMgr.SetRepoRoot(oldSupervisorRoot)
1929 }
1930 if sharedSandbox != nil {
1931 sharedSandbox.Root = oldSandboxRoot
1932 if oldSandboxLocked {
1933 sharedSandbox.Lock()
1934 } else {
1935 sharedSandbox.Unlock()
1936 }
1937 }
1938 }
1939
1940 args.CWD = absPath
1941 r.CWD = absPath
1942 if subagentsMgr != nil {
1943 subagentsMgr.SetRepoRoot(absPath)
1944 }
1945 if args.PermissionSet != nil {
1946 expanded := args.PermissionSet.Expand(absPath, args.AgentDataDir)
1947 args.PermissionSet = &expanded
1948 }
1949 if sharedSandbox != nil {
1950 sharedSandbox.Root = absPath
1951 if oldSandboxLocked {
1952 sharedSandbox.Lock()
1953 } else {
1954 sharedSandbox.Unlock()
1955 }
1956 }
1957
1958 // Rebuild the agent so tools / AGENTS.md / system prompt
1959 // re-bind to the new cwd. buildAgent() reads from args + r.
1960 newAg, newProvider, newModel, berr := buildAgent()
1961 if berr != nil {
1962 rollback()
1963 return fmt.Errorf("rebuild agent: %w", berr)
1964 }
1965
1966 // Fresh session in the new cwd's bucket. We bypass
1967 // openOrCreateSession's --continue / --resume branches
1968 // because /cd's semantics are "start fresh here", matching
1969 // what relaunching `zut --cwd <path>` would do today.
1970 var newSess *core.Session
1971 if !args.NoSess {
1972 newRoot := agentSessionsRoot(ZutHome(), args)
1973 core.PruneEmptySessions(newRoot, absPath)
1974 var serr error
1975 newSess, serr = core.NewSession(newRoot, absPath, newProvider, newModel, version)
1976 if serr != nil {
1977 rollback()
1978 return fmt.Errorf("open session in %s: %w", absPath, serr)
1979 }
1980 }
1981
1982 // Invalidate any title request before swapping the host-owned session
1983 // pointer. The interactive state reset below happens after the swap,
1984 // so this guard closes the window where a late result could otherwise
1985 // be written to the new session.
1986 if iv != nil {
1987 iv.CancelPendingSessionTitle()
1988 }
1989
1990 // Commit only after every fallible operation has succeeded. Close
1991 // the old session last so rollback never has to resurrect it.
1992 var newStates map[string]json.RawMessage
1993 persistMu.Lock()
1994 if sess != nil {
1995 writeNewTranscriptLocked(currentAg, sess, sessBaselineMsgs)
1996 _ = sess.Close()
1997 }
1998 sess = newSess
1999 if newSess != nil {
2000 newStates = copyExtensionStates(newSess.ExtensionState)
2001 }
2002 sessBaselineMsgs = 0
2003 sessionTitlePending = false
2004 activeProvider = newProvider
2005 activeModel = newModel
2006 persistMu.Unlock()
2007 ag = newAg
2008 closeAgentLSP(currentAg)
2009
2010 // Push the new state into the running Interactive.
2011 if iv != nil {
2012 startupPaths := instructionContextPaths(loadAgentsContext(absPath, ZutHome()))
2013 iv.ApplyChangedCWDWithStartupContext(newAg, newProvider, newModel, absPath, startupPaths)
2014 }
2015
2016 // Re-scope the subagent dashboard to the new session.
2017 if subagentsMgr != nil && newSess != nil {
2018 if iv != nil {
2019 iv.SetSubagentSessionScope(newSess.ID)
2020 } else {
2021 subagentsMgr.SetActiveSession(newSess.ID)
2022 }
2023 }
2024 if newSess != nil {
2025 extMgr.EmitSessionEvent("session_opened", sessionContext(newSess), newStates)
2026 }
2027 return nil
2028 }
2029
2030 devBuild := isDevVersion(version)
2031 if devBuild {
2032 fmt.Fprintln(os.Stderr, "zut:", devVersionNotice)
2033 }
2034 term := tui.NewProcTerm()
2035
2036 var updateCh chan modes.UpdateInfo
2037 var changelogCh chan modes.ChangelogPayload
2038 if !devBuild {
2039 // Kick off the async update check so the banner can appear when the
2040 // http response eventually arrives (usually <1s on cached DNS). Map
2041 // agent.UpdateInfo -> modes.UpdateInfo here to avoid a cyclic import.
2042 updateCh = make(chan modes.UpdateInfo, 1)
2043 go func() {
2044 defer close(updateCh)
2045 src := <-CheckForUpdateAsync(ZutHome(), version)
2046 updateCh <- modes.UpdateInfo{
2047 Current: src.Current,
2048 Latest: src.Latest,
2049 Available: src.Available,
2050 URL: src.URL,
2051 }
2052 }()
2053
2054 // Changelog: when the running version differs from the last
2055 // version whose release notes the user dismissed, fetch the
2056 // release body from GitHub and have the TUI show it once. On
2057 // first-ever launch (no prior LastChangelogShown), seed the
2058 // stored version silently — don't dump release notes at someone
2059 // who just installed.
2060 changelogCh = make(chan modes.ChangelogPayload, 1)
2061 go func() {
2062 defer close(changelogCh)
2063 cfg, _ := LoadConfig()
2064 if cfg.LastChangelogShown == "" {
2065 SeedChangelogVersion(version)
2066 return
2067 }
2068 if !ShouldShowChangelog(version, cfg) {
2069 return
2070 }
2071 info := <-FetchChangelogAsync(version)
2072 if info.Body == "" {
2073 return
2074 }
2075 changelogCh <- modes.ChangelogPayload{
2076 Version: info.Version,
2077 Body: info.Body,
2078 URL: info.URL,
2079 }
2080 }()
2081 }
2082
2083 fastMode := r.FastMode
2084 quickModelShortcuts := make([]modes.QuickModelShortcut, len(initialCfg.QuickModelShortcuts))
2085 for idx, s := range initialCfg.QuickModelShortcuts {
2086 quickModelShortcuts[idx] = modes.QuickModelShortcut{Provider: s.Provider, Model: s.Model}
2087 }
2088 theme, _, themeErr := tui.DetectThemeWithCustom(ZutHome(), initialCfg.Theme, 80*time.Millisecond)
2089 if themeErr != nil {
2090 fmt.Fprintln(os.Stderr, "theme load:", themeErr)
2091 if initialCfg.Theme != "" && !tui.ThemeExists(ZutHome(), initialCfg.Theme) {
2092 initialCfg.Theme = ""
2093 _ = SaveConfig(initialCfg)
2094 }
2095 }
2096
2097 // subagentsMgr was constructed and reloaded earlier (before the agent
2098 // build, so the auto-subagents tool could capture it). Here we just
2099 // scope the dashboard to the active host session so /subagents only
2100 // shows agents this session spawned (and any pre-upgrade unscoped
2101 // agents — see SnapshotAll docs). Updated again whenever the
2102 // user swaps sessions via loadSession below.
2103 if sess != nil && subagentsMgr != nil {
2104 subagentsMgr.SetActiveSession(sess.ID)
2105 }
2106 // Best-effort shutdown on interactive exit: stop all running
2107 // agents so they don't outlive their parent zut.
2108 if subagentsMgr != nil {
2109 defer subagentsMgr.StopAll()
2110 }
2111
2112 var startupSkills []*skills.Skill
2113 if r.SkillTool != nil {
2114 startupSkills = r.SkillTool.Skills()
2115 }
2116 homeDir, _ := os.UserHomeDir()
2117 discoveredSubagents, _ := subagents.Discover(r.CWD, homeDir)
2118 subagentsAddendum := subagents.SystemPromptAddendum(discoveredSubagents)
2119 autoSubagentsToolAllowedForSession := autoSubagentsToolAllowed(args)
2120 autoSubagentsStatusToolAllowedForSession := autoSubagentsStatusToolAllowed(args)
2121
2122 iv = modes.NewInteractive(modes.InteractiveConfig{
2123 Terminal: term,
2124 Theme: theme,
2125 InlineImagesEnabled: initialCfg.InlineImagesEnabled,
2126 TerminalAlertsEnabled: initialCfg.TerminalAlertsEnabled,
2127 TerminalTitleEnabled: initialCfg.TerminalTitleEnabled,
2128 AutoSubagentsEnabled: initialCfg.AutoSubagentsEnabled,
2129 PonytailEnabled: initialCfg.PonytailEnabled,
2130 AutoSubagentsToolAllowed: &autoSubagentsToolAllowedForSession,
2131 AutoSubagentsStatusToolAllowed: &autoSubagentsStatusToolAllowedForSession,
2132 FastMode: &fastMode,
2133 LSPEnabled: initialCfg.LSPEnabled,
2134 SubagentLSPEnabled: initialCfg.SubagentLSPEnabled,
2135 AutoCompactThreshold: initialCfg.AutoCompactThreshold,
2136 JailByDefault: initialCfg.JailByDefault,
2137 QuickModelShortcuts: quickModelShortcuts,
2138 RecursiveFileSuggest: initialCfg.RecursiveFileSuggest,
2139 RespectGitignore: initialCfg.RespectGitignore,
2140 CompactMode: initialCfg.CompactMode,
2141 TUIInputStyle: initialCfg.TUIInputStyle,
2142 TUIStatusPosition: initialCfg.TUIStatusPosition,
2143 TUIWorkingPosition: initialCfg.TUIWorkingPosition,
2144 TUISubagentPosition: initialCfg.TUISubagentPosition,
2145 ThemeName: initialCfg.Theme,
2146 FlatTools: initialCfg.FlatToolRender(),
2147 CompactUser: initialCfg.CompactUserInput(),
2148 ExtensionThemes: extMgr.ThemeOptions,
2149 AutoSubagentsSystemAddendum: AutoSubagentsSystemAddendum,
2150 SubagentsSystemAddendum: subagentsAddendum,
2151 SettingsStore: configSettingsStore{},
2152 Model: r.Model,
2153 Provider: r.Provider,
2154 AuthMethod: r.AuthMethod,
2155 BaseURL: r.BaseURL,
2156 Reasoning: r.Reasoning,
2157 SystemPrompt: r.SystemPrompt,
2158 Tools: r.ToolRegistry,
2159 MaxSteps: r.MaxSteps,
2160 CWD: r.CWD,
2161 StartupAgentName: args.AgentName,
2162 StartupContextPaths: instructionContextPaths(r.ContextFiles),
2163 StartupExtensionNames: startupExtensionNames(extMgr.All()),
2164 StartupExtensionErrors: startupExtensionErrors,
2165 StartupSkillNames: startupSkillNames(startupSkills),
2166 ShowInstructionsAtStartup: initialCfg.ShowInstructionsAtStartup,
2167 ZutHome: ZutHome(),
2168 SessionsRoot: agentSessionsRoot(ZutHome(), args),
2169 Version: version,
2170 UpdateInfoChan: updateCh,
2171 Sandbox: sharedSandbox,
2172 Agent: ag,
2173 InitialSessionTitle: func() string {
2174 if sess == nil || sessionTitlePending {
2175 return ""
2176 }
2177 return sess.Title
2178 }(),
2179 InitialSessionTitlePending: sessionTitlePending,
2180 InitialInput: args.Prompt,
2181 StartupPre: args.StartupPre,
2182 OnStartupPreDone: func() {
2183 // entry.pre often installs skills/extensions; rediscover them
2184 // before the user starts a model turn.
2185 current := liveInteractiveAgent(iv, ag)
2186 if extMgr != nil {
2187 _ = extMgr.Reload(context.Background(), 2*time.Second)
2188 }
2189 if current != nil {
2190 if err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, injectSubagentTools, iv); err != nil {
2191 iv.ReportError(err)
2192 }
2193 }
2194 },
2195 RefreshTools: func() error {
2196 current := liveInteractiveAgent(iv, ag)
2197 return refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, injectSubagentTools, iv)
2198 },
2199 RefreshPrompt: func() error {
2200 current := liveInteractiveAgent(iv, ag)
2201 return refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, injectSubagentTools, iv)
2202 },
2203 AuthManager: mgr,
2204 LlamaCPPConfig: ResolveLlamaCPPConfig,
2205 RefreshLlamaCPPModels: RefreshLlamaCPPModels,
2206 BuildAgent: buildAgent,
2207 SetKimiCLIFallbackDisabled: SetKimiCLIFallbackDisabled,
2208 BuildAgentFor: buildAgentFor,
2209 BuildAgentForRescue: buildAgentForRescue,
2210 LoggedInProviders: func() []string {
2211 var out []string
2212 seen := map[string]bool{}
2213 for _, p := range knownProviders {
2214 if CredentialAvailable(p) && !seen[p] {
2215 out = append(out, p)
2216 seen[p] = true
2217 }
2218 }
2219 // Include custom providers that have credentials stored.
2220 for p := range provider.CustomProviders() {
2221 if CredentialAvailable(p) && !seen[p] {
2222 out = append(out, p)
2223 seen[p] = true
2224 }
2225 }
2226 // Ollama models are always available (no auth needed).
2227 if !seen["ollama"] {
2228 out = append(out, "ollama")
2229 }
2230 return out
2231 },
2232 LoadSession: loadSession,
2233 ChangeCWD: changeCWD,
2234 CurrentSessionPath: func() string {
2235 persistMu.Lock()
2236 defer persistMu.Unlock()
2237 if sess == nil {
2238 return ""
2239 }
2240 return sess.Path
2241 },
2242 FlushSession: func() {
2243 sessionTransitionMu.RLock()
2244 defer sessionTransitionMu.RUnlock()
2245 // Append any not-yet-persisted agent messages to the
2246 // current session file, then advance the baseline so
2247 // the final WriteNewTranscript at exit doesn't write
2248 // duplicates. Per-message persistence keeps the on-
2249 // disk file current already, so this is mostly a
2250 // defensive flush — still needed for /session export
2251 // to guarantee the exported bytes include the very
2252 // last in-flight turn.
2253 currentAg := iv.Agent()
2254 if currentAg == nil {
2255 return
2256 }
2257 persistMu.Lock()
2258 defer persistMu.Unlock()
2259 if sess == nil {
2260 return
2261 }
2262 writeNewTranscriptLocked(currentAg, sess, sessBaselineMsgs)
2263 sessBaselineMsgs = len(currentAg.Messages())
2264 },
2265 SessionTransition: newSessionTransition(&sessionTransitionMu),
2266 Extensions: extMgr,
2267 Supervisor: subagentsMgr,
2268 ResolveSubagent: resolveSubagent,
2269 ChangelogChan: changelogCh,
2270 OnChangelogDismiss: func() {
2271 // For development builds, store the actual release version
2272 // so the same changelog doesn't show again next launch.
2273 // For real builds, store the binary version.
2274 v := version
2275 if devBuild {
2276 if iv != nil && iv.ChangelogVersion() != "" {
2277 v = iv.ChangelogVersion()
2278 }
2279 }
2280 _ = MarkChangelogShown(v)
2281 },
2282 SkillSnapshot: func() []*skills.Skill {
2283 if args.NoSkill {
2284 // --no-skill: nothing for the picker to show.
2285 return nil
2286 }
2287 // Re-discover so the picker reflects edits made during
2288 // the session. Cheap; SKILL.md files are small. Filter
2289 // out built-in skills — they're hidden from user-facing
2290 // surfaces because they're implementation detail; the
2291 // model still sees them through the system-prompt
2292 // manifest and the skill tool.
2293 userHome, _ := os.UserHomeDir()
2294 list, _ := skills.Discover(ZutHome(), r.CWD, userHome, args.WithSkills)
2295 list = mergeExtensionSkills(skills.NewTool(list), extMgr.Skills())
2296 return skills.VisibleSkills(list)
2297 },
2298 NoYolo: args.NoYolo,
2299 ConfirmGate: confirmGate,
2300 PersistModel: newPersistModelCallback(&persistMu, &sess, &activeProvider, &activeModel, func(message string) {
2301 if iv != nil {
2302 iv.Notify("session", "error", message)
2303 }
2304 }),
2305 CurrentSessionTitle: func() string {
2306 sessionTransitionMu.RLock()
2307 defer sessionTransitionMu.RUnlock()
2308 persistMu.Lock()
2309 defer persistMu.Unlock()
2310 if sess == nil || sessionTitlePending {
2311 return ""
2312 }
2313 return sess.Title
2314 },
2315 CurrentSessionTitlePending: func() bool {
2316 sessionTransitionMu.RLock()
2317 defer sessionTransitionMu.RUnlock()
2318 persistMu.Lock()
2319 defer persistMu.Unlock()
2320 return sessionTitlePending
2321 },
2322 PersistTitle: func(title string) error {
2323 persistMu.Lock()
2324 defer persistMu.Unlock()
2325 if sess == nil {
2326 return nil
2327 }
2328 if err := sess.UpdateTitle(title); err != nil {
2329 return err
2330 }
2331 sessionTitlePending = false
2332 return nil
2333 },
2334 OnSessionTitleChanged: func(title string) {
2335 sessionTransitionMu.RLock()
2336 defer sessionTransitionMu.RUnlock()
2337 persistMu.Lock()
2338 defer persistMu.Unlock()
2339 if sess != nil {
2340 sess.Title = title
2341 sessionTitlePending = false
2342 }
2343 },
2344 })
2345 extHooks.attachInteractive(iv)
2346
2347 // Bind the interactive TUI as the Confirmer. We deferred this
2348 // until now because the gate is constructed before the TUI
2349 // (the BeforeToolExecute closure captures it). SetConfirmer
2350 // is mutex-guarded on the gate so this is safe.
2351 if confirmGate != nil {
2352 confirmGate.SetConfirmer(&confirmationEventConfirmer{
2353 inner: iv,
2354 emit: extMgr.EmitEvent,
2355 })
2356 }
2357
2358 // Signal-driven flush: a SIGTERM / SIGHUP to the zut process
2359 // (closed terminal window, system shutdown, kill) used to lose
2360 // the entire in-memory transcript because the deferred post-Run
2361 // flush below never ran. Per-message persistence above covers
2362 // most of it; this handler writes any in-flight remainder and
2363 // then exits the process so we don't double-paint over a
2364 // broken terminal that the TUI's restore deferreds can no
2365 // longer fix from a signal context.
2366 //
2367 // SIGINT is intentionally NOT handled here — the TUI consumes
2368 // Ctrl+C as a regular key event for cancel/clear semantics, and
2369 // installing a SIGINT notifier here would swallow it.
2370 sigCh := make(chan os.Signal, 1)
2371 signal.Notify(sigCh, syscall.SIGTERM, syscall.SIGHUP)
2372 defer signal.Stop(sigCh)
2373 go func() {
2374 _, ok := <-sigCh
2375 if !ok {
2376 return
2377 }
2378 finalAg := iv.Agent()
2379 if finalAg != nil {
2380 persistMu.Lock()
2381 if sess != nil {
2382 writeNewTranscriptLocked(finalAg, sess, sessBaselineMsgs)
2383 sessBaselineMsgs = len(finalAg.Messages())
2384 _ = sess.Close()
2385 sess = nil
2386 }
2387 persistMu.Unlock()
2388 }
2389 closeAgentLSP(finalAg)
2390 closeResolvedLSP(r)
2391 // Stop supervised workers before exiting. os.Exit skips deferred
2392 // cleanup, so relying only on the normal runInteractive defer would
2393 // leave child daemons (and their descendants) alive after a TERM or
2394 // HUP delivered to the host.
2395 if subagentsMgr != nil {
2396 subagentsMgr.StopAll()
2397 }
2398 // Exit cleanly. Re-raising the signal would skip os.Exit's
2399 // at-exit hooks; explicit exit is fine because we've already
2400 // flushed the only at-risk state (the session file) and stopped
2401 // supervised workers.
2402 os.Exit(0)
2403 }()
2404
2405 runErr := iv.Run(ctx)
2406
2407 // Flush final transcript to session (only if we had / ended up with an agent).
2408 if finalAg := iv.Agent(); finalAg != nil {
2409 persistMu.Lock()
2410 if sess != nil {
2411 writeNewTranscriptLocked(finalAg, sess, sessBaselineMsgs)
2412 sessBaselineMsgs = len(finalAg.Messages())
2413 }
2414 persistMu.Unlock()
2415 }
2416 return runErr
2417}
2418
2419func agentSessionsRoot(root string, args Args) string {
2420 if args.AgentName == "" {
2421 return root
2422 }
2423 return filepath.Join(root, "sessions", "agents", safeAgentName(args.AgentName))
2424}
2425
2426// openOrCreateSession returns a session for the run. sess may be nil
2427// with a nil error if session persistence is disabled.
2428func openOrCreateSession(args Args, r Resolved, ag *core.Agent, version string) (*core.Session, error) {
2429 if args.NoSess {
2430 return nil, nil
2431 }
2432 // Sweep meta-only files left over from older zut versions (and from
2433 // any session that crashed before its first AppendMessage). Cheap;
2434 // reads the first few bytes of each file in the cwd's session dir.
2435 sessionsRoot := agentSessionsRoot(ZutHome(), args)
2436 core.PruneEmptySessions(sessionsRoot, args.CWD)
2437 var (
2438 s *core.Session
2439 msgs []provider.Message
2440 err error
2441 )
2442 switch {
2443 case args.Session != "":
2444 s, msgs, err = core.OpenSession(args.Session)
2445 // The subagent-worker child passes a fixed --session path that
2446 // may not exist yet on first Spawn. Treat ENOENT as "create
2447 // a fresh session AT THIS PATH" so the conversation actually
2448 // gets persisted; without this fallback the subagent child runs
2449 // with sess==nil and every Resume re-starts with no memory
2450 // of the prior turns. Other openers (--continue / --resume /
2451 // the picker) never see ENOENT here because they only choose
2452 // paths that already exist on disk.
2453 if err != nil && errors.Is(err, os.ErrNotExist) {
2454 s, err = core.NewSessionAtPath(args.Session, args.CWD, r.Provider, r.Model, version)
2455 msgs = nil
2456 }
2457 case args.Continue:
2458 latest := core.LatestSession(sessionsRoot, args.CWD)
2459 if latest != "" {
2460 s, msgs, err = core.OpenSession(latest)
2461 }
2462 case args.Resume:
2463 picked, perr := pickSession(sessionsRoot, args.CWD)
2464 if perr != nil {
2465 return nil, perr
2466 }
2467 if picked != "" {
2468 s, msgs, err = core.OpenSession(picked)
2469 }
2470 }
2471 if err != nil {
2472 return nil, err
2473 }
2474 if s != nil {
2475 ag.SetMessages(msgs)
2476 if cum, last, uerr := core.SessionUsageDetail(s.Path); uerr == nil {
2477 ag.SeedCost(cum)
2478 ag.SeedLastTurnUsage(last)
2479 }
2480 return s, nil
2481 }
2482 return core.NewSession(sessionsRoot, args.CWD, r.Provider, r.Model, version)
2483}
2484
2485func pickSession(root, cwd string) (string, error) {
2486 files := core.ListSessions(root, cwd)
2487 if len(files) == 0 {
2488 fmt.Fprintln(os.Stderr, "no sessions for", cwd)
2489 return "", nil
2490 }
2491 for i, f := range files {
2492 fmt.Fprintf(os.Stderr, " %2d) %s\n", i+1, f)
2493 }
2494 fmt.Fprint(os.Stderr, "pick #: ")
2495 rd := bufio.NewReader(os.Stdin)
2496 line, _ := rd.ReadString('\n')
2497 line = strings.TrimSpace(line)
2498 var n int
2499 if _, err := fmt.Sscanf(line, "%d", &n); err != nil || n < 1 || n > len(files) {
2500 return "", fmt.Errorf("invalid selection")
2501 }
2502 return files[n-1], nil
2503}
2504
2505// WriteNewTranscript appends only messages after index `from` from the
2506// agent's transcript to the session. Used by callers that don't hold
2507// the persistMu (non-interactive print/json modes which run a single
2508// turn under their own goroutine).
2509func WriteNewTranscript(ag *core.Agent, sess *core.Session, from int) {
2510 writeNewTranscriptLocked(ag, sess, from)
2511}
2512
2513// writeNewTranscriptLocked is the same as WriteNewTranscript. The
2514// suffix marks that interactive callers must hold persistMu when
2515// invoking it so concurrent appends from the agent loop don't race
2516// with this catch-up flush.
2517func writeNewTranscriptLocked(ag *core.Agent, sess *core.Session, from int) {
2518 if sess == nil || ag == nil {
2519 return
2520 }
2521 msgs := ag.Messages()
2522 for i := from; i < len(msgs); i++ {
2523 _ = sess.AppendMessage(msgs[i])
2524 }
2525 cum := ag.Cost()
2526 _ = sess.AppendUsage(cum, cum)
2527}
2528
2529func readAllStdin() (string, error) {
2530 fi, err := os.Stdin.Stat()
2531 if err != nil {
2532 return "", err
2533 }
2534 if (fi.Mode() & os.ModeCharDevice) != 0 {
2535 return "", nil
2536 }
2537 b, err := io.ReadAll(os.Stdin)
2538 return string(b), err
2539}
2540
2541func printModels() {
2542 models := provider.Active()
2543
2544 // Compute column widths from actual data so wide providers (e.g.
2545 // xiaomi-token-plan-sgp) and long bedrock model ids don't force the
2546 // `name` column off-screen. Floors mirror the historical layout so
2547 // short catalogs look the same as before.
2548 provW, idW, srcW := len("provider"), len("model id"), len("source")
2549 for _, m := range models {
2550 if w := len(m.Provider); w > provW {
2551 provW = w
2552 }
2553 if w := len(m.ID); w > idW {
2554 idW = w
2555 }
2556 source := m.Source
2557 if source == "" {
2558 source = "catalog"
2559 }
2560 if m.Speculative {
2561 source = "speculative"
2562 }
2563 if w := len(source); w > srcW {
2564 srcW = w
2565 }
2566 }
2567
2568 header := fmt.Sprintf("%-*s %-*s %8s %8s %s %-*s %s",
2569 provW, "provider",
2570 idW, "model id",
2571 "context", "max-out", "reasoning",
2572 srcW, "source",
2573 "name")
2574 fmt.Println(header)
2575
2576 for _, m := range models {
2577 reason := " "
2578 if m.Reasoning {
2579 reason = "✓"
2580 }
2581 source := m.Source
2582 if source == "" {
2583 source = "catalog"
2584 }
2585 if m.Speculative {
2586 source = "speculative"
2587 }
2588 fmt.Printf("%-*s %-*s %8d %8d %s %-*s %s\n",
2589 provW, m.Provider,
2590 idW, m.ID,
2591 m.ContextWindow, m.MaxOutput,
2592 reason,
2593 srcW, source,
2594 m.DisplayName)
2595 }
2596}