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 joinSessionCloseError(err error, sess *core.Session) error {
355 if sess == nil {
356 return err
357 }
358 if closeErr := sess.Close(); closeErr != nil {
359 return errors.Join(err, fmt.Errorf("close session: %w", closeErr))
360 }
361 return err
362}
363
364func closeResolvedLSP(r Resolved) {
365 _ = tools.CloseLSPManagers(r.ToolRegistry)
366}
367
368func trimMessagesForResume(msgs []provider.Message, keepTail int) []provider.Message {
369 if keepTail <= 0 || len(msgs) <= keepTail {
370 return provider.RepairOrphanedToolResults(msgs)
371 }
372 var out []provider.Message
373 start := len(msgs) - keepTail
374 var carriedToolNames []string
375 addToolNames := func(names []string) {
376 for _, name := range names {
377 if name == "" || slices.Contains(carriedToolNames, name) {
378 continue
379 }
380 carriedToolNames = append(carriedToolNames, name)
381 }
382 }
383 // Activation markers in the discarded prefix still affect the retained
384 // provider request. Carry them onto its first message rather than dropping
385 // deferred-tool availability when the resume tail is shortened.
386 for _, msg := range msgs[:start] {
387 addToolNames(msg.AddedToolNames)
388 }
389 // Preserve the synthetic compaction summary when present so an
390 // already-compacted session stays compacted after resume. Count it
391 // within the tail budget instead of dropping it at the exact boundary.
392 if len(msgs) > 0 && msgs[0].Meta["compaction"] == "true" && start > 0 {
393 out = append(out, msgs[0])
394 start++
395 }
396 // Avoid hydrating a tail that starts with orphan tool_result rows;
397 // provider APIs require those to be paired with an earlier tool_use.
398 for start < len(msgs) && msgs[start].Role == provider.RoleTool {
399 start++
400 }
401 out = append(out, msgs[start:]...)
402 if len(carriedToolNames) > 0 && len(out) > 0 {
403 first := out[0]
404 for _, name := range first.AddedToolNames {
405 addToolNames([]string{name})
406 }
407 first.AddedToolNames = append([]string(nil), carriedToolNames...)
408 out[0] = first
409 }
410 return provider.RepairOrphanedToolResults(out)
411}
412
413// sessionResumeCandidate contains all state needed to resume a session.
414// It is deliberately assembled before the caller changes any live state:
415// opening the transcript, reading usage, and rebuilding a provider/model
416// must all succeed before the candidate can replace the current session.
417type sessionResumeCandidate struct {
418 session *core.Session
419 agent *core.Agent
420 messages []provider.Message
421 fullMessageCount int
422 cumulative provider.Usage
423 lastTurn provider.Usage
424 provider string
425 model string
426 rebuilt bool
427}
428
429// prepareSessionResume opens and validates a selected session without
430// touching the current agent. Missing provider/model metadata is treated as
431// legacy metadata: the current agent is reused, preserving compatibility
432// with sessions written before those fields were persisted.
433//
434// The returned candidate owns session until its caller commits it. On any
435// error this function closes the candidate session and leaves the current
436// agent untouched.
437func prepareSessionResume(path string, current *core.Agent, currentProvider, currentModel string, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (sessionResumeCandidate, error) {
438 return prepareSessionResumeWithOptions(path, current, currentProvider, currentModel, false, false, buildAgentFor)
439}
440
441// prepareSessionResumeWithOptions is the provider/model-aware implementation.
442// An explicit CLI provider or model keeps that field authoritative; an empty
443// field falls back to the selected session's metadata when it is complete.
444func 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) {
445 if current == nil {
446 return candidate, fmt.Errorf("no agent running; log in first")
447 }
448
449 sess, msgs, err := core.OpenSession(path)
450 if err != nil {
451 return candidate, err
452 }
453 keepSession := false
454 defer func() {
455 if !keepSession {
456 err = joinSessionCloseError(err, sess)
457 }
458 }()
459
460 cumulative, lastTurn, err := core.SessionUsageDetail(path)
461 if err != nil {
462 return candidate, fmt.Errorf("read session usage: %w", err)
463 }
464
465 fullMessageCount := len(msgs)
466 resumedMessages := trimMessagesForResume(msgs, 100)
467 storedProvider := strings.TrimSpace(sess.Meta.Provider)
468 storedModel := strings.TrimSpace(sess.Meta.Model)
469 currentProvider = strings.TrimSpace(currentProvider)
470 currentModel = strings.TrimSpace(currentModel)
471
472 candidate = sessionResumeCandidate{
473 session: sess,
474 agent: current,
475 messages: resumedMessages,
476 fullMessageCount: fullMessageCount,
477 cumulative: cumulative,
478 lastTurn: lastTurn,
479 provider: currentProvider,
480 model: currentModel,
481 }
482
483 // Old sessions may have either field absent. Only a complete stored
484 // selection is actionable; otherwise resume exactly as older zut did.
485 if storedProvider == "" || storedModel == "" {
486 keepSession = true
487 return candidate, nil
488 }
489
490 resumeProvider := storedProvider
491 if explicitProvider {
492 resumeProvider = currentProvider
493 }
494 resumeModel := storedModel
495 if explicitModel {
496 resumeModel = currentModel
497 }
498 if resumeProvider == currentProvider && resumeModel == currentModel {
499 keepSession = true
500 return candidate, nil
501 }
502 if buildAgentFor == nil {
503 return sessionResumeCandidate{}, fmt.Errorf("cannot resume session with provider %q and model %q: no agent builder configured", resumeProvider, resumeModel)
504 }
505
506 rebuilt, resolvedProvider, resolvedModel, err := buildAgentFor(resumeProvider, resumeModel)
507 if err != nil {
508 return sessionResumeCandidate{}, fmt.Errorf("rebuild agent for session provider %q/model %q: %w", resumeProvider, resumeModel, err)
509 }
510 if rebuilt == nil {
511 return sessionResumeCandidate{}, fmt.Errorf("rebuild agent for session provider %q/model %q returned no agent", resumeProvider, resumeModel)
512 }
513 resolvedProvider = strings.TrimSpace(resolvedProvider)
514 resolvedModel = strings.TrimSpace(resolvedModel)
515 if resolvedProvider == "" {
516 resolvedProvider = storedProvider
517 }
518 if resolvedModel == "" {
519 resolvedModel = storedModel
520 }
521
522 // Hydrate and seed the replacement while it is still private. The live
523 // agent is not modified until the caller commits the complete candidate.
524 rebuilt.SetMessages(resumedMessages)
525 rebuilt.SeedCost(cumulative)
526 rebuilt.SeedLastTurnUsage(lastTurn)
527 candidate.agent = rebuilt
528 candidate.provider = resolvedProvider
529 candidate.model = resolvedModel
530 candidate.rebuilt = true
531 keepSession = true
532 return candidate, nil
533}
534
535func buildNonInteractiveSessionAgentWithRegistry(ctx context.Context, args Args, base Resolved, extMgr *extensions.Manager, providerName, model string, prepareRegistry func(core.Registry) core.Registry) (*core.Agent, string, string, error) {
536 next := args
537 next.Provider = providerName
538 next.Model = model
539 resolved, err := Resolve(next, true)
540 if err != nil {
541 return nil, "", "", err
542 }
543 resolved.UseSandbox(base.Sandbox)
544 if extMgr != nil {
545 resolved.MergeExtensionTools(&extToolAdapter{mgr: extMgr})
546 }
547 if prepareRegistry != nil {
548 prepareRegistry(resolved.ToolRegistry)
549 }
550 ag := resolved.NewAgent()
551 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
552 return ag, resolved.Provider, resolved.Model, nil
553}
554
555// applySessionResume shares the startup gate, candidate hydration, and
556// commit order used by interactive and non-interactive session opening. The
557// old append handle is closed only after the candidate has been prepared and
558// seeded successfully.
559func applySessionResume(sess *core.Session, ag *core.Agent, currentProvider, currentModel string, explicitProvider, explicitModel bool, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (sessionResumeCandidate, error) {
560 candidate := sessionResumeCandidate{
561 session: sess,
562 agent: ag,
563 fullMessageCount: 0,
564 provider: currentProvider,
565 model: currentModel,
566 }
567 if ag != nil {
568 candidate.fullMessageCount = len(ag.Messages())
569 }
570 if sess == nil || ag == nil {
571 return candidate, nil
572 }
573 ag.SetSessionTimeContext(sess.Meta.Started, sess.Meta.Timezone, sess.Meta.TimezoneOffset)
574 // A newly created meta-only session is already on the active pair. Avoid
575 // reopening and closing it through the resume path: Close intentionally
576 // removes fresh empty sessions, and a second append handle would otherwise
577 // keep an unlinked file alive.
578 if len(ag.Messages()) == 0 &&
579 strings.TrimSpace(sess.Meta.Provider) == strings.TrimSpace(currentProvider) &&
580 strings.TrimSpace(sess.Meta.Model) == strings.TrimSpace(currentModel) {
581 return candidate, nil
582 }
583 candidate, err := prepareSessionResumeWithOptions(sess.Path, ag, currentProvider, currentModel, explicitProvider, explicitModel, buildAgentFor)
584 if err != nil {
585 return sessionResumeCandidate{}, joinSessionCloseError(err, sess)
586 }
587 // A replacement agent is still private at this point. Bind the durable
588 // identity before it can be published or run any startup work.
589 if err := candidate.agent.BindSessionID(candidate.session.Meta.ID); err != nil {
590 return sessionResumeCandidate{}, joinSessionCloseError(err, candidate.session)
591 }
592 if !candidate.rebuilt {
593 candidate.agent.SetMessages(candidate.messages)
594 candidate.agent.SeedCost(candidate.cumulative)
595 candidate.agent.SeedLastTurnUsage(candidate.lastTurn)
596 }
597 if closeErr := sess.Close(); closeErr != nil {
598 return sessionResumeCandidate{}, errors.Join(fmt.Errorf("close session: %w", closeErr), joinSessionCloseError(nil, candidate.session))
599 }
600 candidate.agent.SetSessionTimeContext(candidate.session.Meta.Started, candidate.session.Meta.Timezone, candidate.session.Meta.TimezoneOffset)
601 return candidate, nil
602}
603
604// applyInitialSessionResume applies the same provider/model-aware candidate
605// contract used by interactive session switching to non-interactive startup
606// modes. The returned session owns the replacement append handle.
607func applyInitialSessionResume(ctx context.Context, args Args, base Resolved, extMgr *extensions.Manager, sess *core.Session, ag *core.Agent) (*core.Session, *core.Agent, string, string, error) {
608 return applyInitialSessionResumeWithRegistry(ctx, args, base, extMgr, sess, ag, nil)
609}
610
611func applyInitialSessionResumeWithRegistry(ctx context.Context, args Args, base Resolved, extMgr *extensions.Manager, sess *core.Session, ag *core.Agent, prepareRegistry func(core.Registry) core.Registry) (*core.Session, *core.Agent, string, string, error) {
612 candidate, err := applySessionResume(sess, ag, base.Provider, base.Model,
613 strings.TrimSpace(args.Provider) != "", strings.TrimSpace(args.Model) != "", func(providerName, model string) (*core.Agent, string, string, error) {
614 return buildNonInteractiveSessionAgentWithRegistry(ctx, args, base, extMgr, providerName, model, prepareRegistry)
615 })
616 if err != nil {
617 return nil, ag, "", "", err
618 }
619 return candidate.session, candidate.agent, candidate.provider, candidate.model, nil
620}
621
622func applyInitialSessionResumeWithRuntime(ctx context.Context, args Args, base Resolved, extMgr *extensions.Manager, sess *core.Session, ag *core.Agent, runtime *subagentRuntime) (*core.Session, *core.Agent, string, string, error) {
623 candidate, err := applySessionResume(sess, ag, base.Provider, base.Model,
624 strings.TrimSpace(args.Provider) != "", strings.TrimSpace(args.Model) != "", func(providerName, model string) (*core.Agent, string, string, error) {
625 next := args
626 next.Provider = providerName
627 next.Model = model
628 resolved, resolveErr := Resolve(next, true)
629 if resolveErr != nil {
630 return nil, "", "", resolveErr
631 }
632 resolved.UseSandbox(base.Sandbox)
633 if extMgr != nil {
634 resolved.MergeExtensionTools(&extToolAdapter{mgr: extMgr})
635 }
636 if runtime != nil {
637 runtime.SetProvider(resolved.Provider)
638 runtime.SetModel(resolved.Model)
639 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
640 runtime.SetFastMode(resolved.FastMode)
641 runtime.PrepareResolvedRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
642 }
643 rebuilt := resolved.NewAgent()
644 wireNonInteractiveAgentExtHooks(ctx, rebuilt, extMgr)
645 return rebuilt, resolved.Provider, resolved.Model, nil
646 })
647 if err != nil {
648 return nil, ag, "", "", err
649 }
650 return candidate.session, candidate.agent, candidate.provider, candidate.model, nil
651}
652
653// fanoutAgentEvent translates a core.AgentEvent into the wire-format
654// EventFromHost and pushes it through the extension manager. Only
655// the events that have a clear extension-facing meaning are
656// forwarded; internal-only ones (text_delta, tool_progress) are
657// dropped to keep the per-extension stream sane.
658func sessionContext(sess *core.Session) *extproto.SessionContext {
659 if sess == nil {
660 return nil
661 }
662 return &extproto.SessionContext{
663 ID: sess.Meta.ID,
664 ParentID: sess.Meta.Parent,
665 Path: sess.Path,
666 CWD: sess.Meta.CWD,
667 ForkPoint: sess.Meta.ForkPoint,
668 }
669}
670
671func announceSession(mgr *extensions.Manager, sess *core.Session) {
672 if mgr == nil {
673 return
674 }
675 var states map[string]json.RawMessage
676 if sess != nil {
677 states = copyExtensionStates(sess.ExtensionState)
678 }
679 mgr.EmitSessionEvent("session_start", sessionContext(sess), states)
680 if sess != nil {
681 mgr.EmitSessionEvent("session_opened", sessionContext(sess), states)
682 }
683}
684
685func copyExtensionStates(states map[string]json.RawMessage) map[string]json.RawMessage {
686 if len(states) == 0 {
687 return nil
688 }
689 out := make(map[string]json.RawMessage, len(states))
690 for name, state := range states {
691 out[name] = append(json.RawMessage(nil), state...)
692 }
693 return out
694}
695
696func persistToolResultState(mgr *extensions.Manager, sess *core.Session, result core.ToolResult) error {
697 if sess == nil {
698 return nil
699 }
700 if details, ok := result.Details.(extensions.ToolResultDetails); ok && details.Extension != "" && len(details.State) > 0 {
701 if err := sess.AppendExtensionState(details.Extension, details.State); err != nil {
702 return fmt.Errorf("extension state: %w", err)
703 }
704 if mgr != nil {
705 mgr.UpdateSessionState(details.Extension, details.State)
706 }
707 }
708 if err := persistGoalToolResult(sess, result); err != nil {
709 return fmt.Errorf("goal state: %w", err)
710 }
711 return nil
712}
713
714func persistGoalToolResult(sess *core.Session, result core.ToolResult) error {
715 if sess == nil {
716 return nil
717 }
718 update, ok := tools.GoalUpdateFromResult(result)
719 if !ok {
720 return nil
721 }
722 if update.Status == core.GoalActive {
723 if sess.Meta.Goal != nil && sess.Meta.Goal.Status == core.GoalActive {
724 return fmt.Errorf("cannot replace an active goal")
725 }
726 if sess.Meta.Mission != nil && update.MissionID != "" && update.MissionID != sess.Meta.Mission.ID {
727 return fmt.Errorf("goal update does not belong to the active mission")
728 }
729 return sess.UpdateGoal(&core.SessionGoal{Objective: update.Objective, Status: core.GoalActive, Owner: core.GoalOwnerManager})
730 }
731 if sess.Meta.Goal == nil || sess.Meta.Goal.Status != core.GoalActive {
732 return nil
733 }
734 goal := *sess.Meta.Goal
735 goal.Status = update.Status
736 goal.Reason = update.Reason
737 return sess.UpdateGoal(&goal)
738}
739
740func fanoutAgentEvent(mgr *extensions.Manager, ev core.AgentEvent) {
741 if mgr == nil {
742 return
743 }
744 switch e := ev.(type) {
745 case core.EvTurnStart:
746 mgr.EmitEvent(extproto.EventFromHost{Event: "turn_start", Step: e.Step})
747 case core.EvToolCall:
748 mgr.EmitEvent(extproto.EventFromHost{
749 Event: "tool_call", ToolID: e.ID, ToolName: e.Name, ToolArgs: e.Args,
750 })
751 case core.EvAssistantMessage:
752 // Concat the visible text portions of the message; binary
753 // blocks (tool_use, etc.) are skipped because subscribers
754 // usually want a string they can grep / display.
755 var text string
756 for _, c := range e.Message.Content {
757 if tb, ok := c.(provider.TextBlock); ok {
758 text += tb.Text
759 }
760 }
761 mgr.EmitEvent(extproto.EventFromHost{Event: "assistant_message", Text: text})
762 case core.EvTurnEnd:
763 ev := extproto.EventFromHost{Event: "turn_end", Stop: string(e.Stop)}
764 if e.Err != nil {
765 ev.Error = e.Err.Error()
766 }
767 mgr.EmitEvent(ev)
768 }
769}
770
771// Run is the top-level entrypoint for the zut binary.
772func Run(rawArgs []string, version string) error {
773 // Apply network configuration before any subcommand can make an HTTP
774 // request. Standard proxy environment variables retain precedence.
775 applyConfiguredHTTPProxy()
776
777 // Extension installs can invoke external build and clone processes.
778 // Give those processes a cancellation context without changing signal
779 // handling for the interactive modes below.
780 extCtx := context.Background()
781 stopExtContext := func() {}
782 if len(rawArgs) > 0 && rawArgs[0] == "ext" {
783 extCtx, stopExtContext = signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
784 }
785 defer stopExtContext()
786
787 // Subcommand router: `zut bot ...` is handled separately so the
788 // generic flag parser doesn't reject "bot" as a positional arg.
789 if handled, err := runBotCommand(rawArgs, version); handled {
790 return err
791 }
792 if handled, err := runExtCommand(extCtx, rawArgs, version); handled {
793 return err
794 }
795 if handled, err := runUpdateCommand(rawArgs, version); handled {
796 return err
797 }
798 if handled, err := runZutfileCommand(rawArgs, version); handled {
799 return err
800 }
801 return runWithArgsRaw(rawArgs, version)
802}
803
804func runWithArgsRaw(rawArgs []string, version string) error {
805 // `zut rpc` is shorthand for `zut --rpc` so third-party apps can
806 // spawn the binary with a clean argv. Strip the leading 'rpc'
807 // token and let the rest flow through the normal arg parser.
808 if len(rawArgs) > 0 && rawArgs[0] == "rpc" {
809 rawArgs = append([]string{"--rpc"}, rawArgs[1:]...)
810 }
811
812 if fi, err := os.Stdin.Stat(); err == nil {
813 rawArgs = argsForStdin(rawArgs, fi.Mode())
814 }
815 args, err := ParseArgs(rawArgs)
816 if err != nil {
817 PrintHelp(version)
818 return err
819 }
820 if args.Help {
821 PrintHelp(version)
822 return nil
823 }
824 if args.Version {
825 fmt.Println("zut", version)
826 return nil
827 }
828 // Reject invalid orchestration combinations before catalog repair or model
829 // refresh can mutate local state or launch background work.
830 if err := validateOrchestrationArgs(args); err != nil {
831 return err
832 }
833 // Model catalog: load any cached discovery data before we inspect
834 // the model list (list-models, print/json, interactive).
835 prepareRuntimeCatalog()
836
837 if args.ListModels {
838 printModels()
839 return nil
840 }
841
842 return runWithArgs(args, version)
843}
844
845func runWithArgs(args Args, version string) error {
846 if err := validateOrchestrationArgs(args); err != nil {
847 return err
848 }
849 ctx := context.Background()
850 switch args.Mode {
851 case ModePrint:
852 return runPrintMode(ctx, args, version)
853 case ModeStream:
854 return runStreamMode(ctx, args, version)
855 case ModeJSON:
856 return runJSONMode(ctx, args, version)
857 case ModeRPC:
858 return runRPCMode(ctx, args, version)
859 default:
860 return runInteractive(ctx, args, version)
861 }
862}
863
864// ---- print / json modes: require credentials, run single-shot ----
865
866// nonInteractiveExtHooks is the HostHooks impl used by print / json
867// modes. They have no TUI, so notify / display go to stderr and
868// submit / insert are no-ops (the extension can't steer a
869// single-shot run once it's in flight anyway).
870type nonInteractiveExtHooks struct{}
871
872func (nonInteractiveExtHooks) Notify(ext, level, message string) {
873 fmt.Fprintf(os.Stderr, "[%s] %s: %s\n", ext, level, message)
874}
875func (nonInteractiveExtHooks) Alert(string, extproto.AlertRequest) {}
876func (nonInteractiveExtHooks) Submit(string) {}
877func (nonInteractiveExtHooks) SubmitSlash(string) {}
878func (nonInteractiveExtHooks) Insert(string) {}
879func (nonInteractiveExtHooks) Display(string, string) {}
880func (nonInteractiveExtHooks) ClearNotes(string) {}
881func (nonInteractiveExtHooks) OpenPanel(string, extproto.PanelSpec) {}
882func (nonInteractiveExtHooks) UpdatePanel(string, string, string, []string, string) {}
883func (nonInteractiveExtHooks) ClosePanel(string, string) {}
884func (nonInteractiveExtHooks) SetStatus(string, string, string, string) {}
885func (nonInteractiveExtHooks) SetWidget(string, string, string, string, []string) {}
886func (nonInteractiveExtHooks) ClearWidget(string, string) {}
887
888// setupNonInteractiveExtensions loads --ext paths and (unless
889// --no-ext) runs discovery. Returns the manager so the caller can
890// wire tools into the resolved registry, and a cleanup closure to
891// defer. Mirrors the interactive-mode setup minus the TUI hooks.
892func setupNonInteractiveExtensions(ctx context.Context, args Args, r *Resolved, version string) (*extensions.Manager, func()) {
893 extMgr := extensions.New(ZutHome(), r.CWD, version, r.Provider, r.Model, nonInteractiveExtHooks{})
894 for _, e := range extMgr.LoadExplicit(ctx, args.Exts) {
895 fmt.Fprintln(os.Stderr, "extension load:", e)
896 }
897 if !args.NoExt {
898 for _, e := range extMgr.Discover(ctx) {
899 fmt.Fprintln(os.Stderr, "extension load:", e)
900 }
901 }
902 extMgr.WaitForReady(3 * time.Second)
903 r.MergeExtensionTools(&extToolAdapter{mgr: extMgr})
904 return extMgr, func() { extMgr.Stop(2 * time.Second) }
905}
906
907// wireNonInteractiveAgentExtHooks installs the same BeforeToolExecute
908// / BeforeTurn / BeforeAssistantMessage / OnEvent hooks the
909// interactive path wires up, so extensions get their normal
910// event-intercept surface in print / json / rpc flows too.
911func wireNonInteractiveAgentExtHooks(ctx context.Context, ag *core.Agent, extMgr *extensions.Manager) {
912 if ag == nil || extMgr == nil {
913 return
914 }
915 ag.BeforeToolExecute = func(call provider.ToolCallBlock) (bool, string, json.RawMessage) {
916 res := extMgr.InterceptToolCall(ctx, call.ID, call.Name, call.Arguments)
917 if res.Block {
918 return false, res.Reason, nil
919 }
920 return true, "", res.ModifiedArgs
921 }
922 ag.BeforeTurnContext = func(turnCtx context.Context, step int) (bool, string, string) {
923 res := extMgr.InterceptTurnStart(turnCtx, step)
924 return !res.Block, res.Reason, res.Context
925 }
926 ag.BeforeAssistantMessage = func(text string) (bool, string, string) {
927 res := extMgr.InterceptAssistantMessage(ctx, text)
928 if res.Block {
929 return false, res.Reason, ""
930 }
931 return true, "", res.ReplaceText
932 }
933 ag.OnEvent = func(ev core.AgentEvent) { fanoutAgentEvent(extMgr, ev) }
934}
935
936type printStats struct {
937 Provider string `json:"provider"`
938 Model string `json:"model"`
939 PromptTokens int `json:"prompt_tokens"`
940 ReasoningTokens *int `json:"reasoning_tokens"`
941 GeneratedOutputTokens int `json:"generated_output_tokens"`
942 ElapsedMS int64 `json:"elapsed_ms"`
943}
944
945func writePrintStats(path, providerID, model string, usage provider.Usage, elapsed time.Duration) error {
946 var reasoning *int
947 generated := usage.OutputTokens
948 if usage.ReasoningTokensKnown {
949 count := usage.ReasoningTokens
950 reasoning = &count
951 generated -= count
952 if generated < 0 {
953 generated = 0
954 }
955 }
956 stats := printStats{
957 Provider: providerID,
958 Model: model,
959 PromptTokens: usage.InputTokens + usage.CacheReadTokens + usage.CacheWriteTokens,
960 ReasoningTokens: reasoning,
961 GeneratedOutputTokens: generated,
962 ElapsedMS: elapsed.Milliseconds(),
963 }
964 data, err := json.MarshalIndent(stats, "", " ")
965 if err != nil {
966 return fmt.Errorf("encode stats: %w", err)
967 }
968 data = append(data, '\n')
969 if err := os.WriteFile(path, data, 0o644); err != nil {
970 return fmt.Errorf("write stats %q: %w", path, err)
971 }
972 return nil
973}
974
975func runPrintMode(ctx context.Context, args Args, version string) (runErr error) {
976 if args.Orchestrate {
977 return runOrchestratedPrintMode(ctx, args, version)
978 }
979 if args.NoYolo {
980 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in print mode (no interactive prompt available); tools will run without confirmation")
981 }
982 r, err := Resolve(args, true)
983 if err != nil {
984 return err
985 }
986 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
987 defer stopExt()
988
989 ag := r.NewAgent()
990 initialAg := ag
991 defer func() {
992 closeAgentLSP(ag)
993 if ag != initialAg {
994 closeAgentLSP(initialAg)
995 }
996 }()
997 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
998 sess, err := openOrCreateSession(ctx, args, r, ag, version)
999 if err != nil {
1000 return err
1001 }
1002 if sess != nil {
1003 var providerName, model string
1004 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
1005 if err != nil {
1006 return err
1007 }
1008 r.Provider, r.Model = providerName, model
1009 ag.CommitToolResult = func(_ string, result core.ToolResult) error { return persistToolResultState(extMgr, sess, result) }
1010 defer func() { runErr = joinSessionCloseError(runErr, sess) }()
1011 }
1012 announceSession(extMgr, sess)
1013 wireRetryLifecyclePersistence(ag, sess)
1014 if sess != nil {
1015 defer func() { runErr = errors.Join(runErr, sess.FlushRetryLifecycle(ag.LastTurnUsage(), ag.Cost())) }()
1016 }
1017
1018 piped, _ := readAllStdin()
1019 prompt := combinePromptInput(piped, args.Prompt)
1020 if prompt == "" {
1021 return fmt.Errorf("print mode requires a prompt (arg or stdin)")
1022 }
1023
1024 start := len(ag.Messages())
1025 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, nil, os.Stderr); err != nil {
1026 return err
1027 }
1028 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
1029 return err
1030 }
1031 var persistCompaction func([]provider.Message) error
1032 if sess != nil {
1033 persistCompaction = sess.AppendCompaction
1034 }
1035 started := time.Now()
1036 usage, recovery, err := modes.RunPrintWithContextRecovery(ctx, ag, prompt, nil, os.Stdout, persistCompaction)
1037 elapsed := time.Since(started)
1038 transcriptStart := start
1039 if recovery.Compacted {
1040 transcriptStart = recovery.OutputStart
1041 }
1042 if persistErr := WriteNewTranscript(ag, sess, transcriptStart); persistErr != nil {
1043 if err != nil {
1044 return errors.Join(err, persistErr)
1045 }
1046 return persistErr
1047 }
1048 if err != nil {
1049 return err
1050 }
1051 if args.StatsPath != "" {
1052 return writePrintStats(args.StatsPath, r.Provider, r.Model, usage, elapsed)
1053 }
1054 return nil
1055}
1056
1057func runStreamMode(ctx context.Context, args Args, version string) (runErr error) {
1058 if args.Orchestrate {
1059 return runOrchestratedStreamMode(ctx, args, version)
1060 }
1061 if args.NoYolo {
1062 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in stream mode (no interactive prompt available); tools will run without confirmation")
1063 }
1064 r, err := Resolve(args, true)
1065 if err != nil {
1066 return err
1067 }
1068 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
1069 defer stopExt()
1070
1071 ag := r.NewAgent()
1072 initialAg := ag
1073 defer func() {
1074 closeAgentLSP(ag)
1075 if ag != initialAg {
1076 closeAgentLSP(initialAg)
1077 }
1078 }()
1079 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
1080 sess, err := openOrCreateSession(ctx, args, r, ag, version)
1081 if err != nil {
1082 return err
1083 }
1084 if sess != nil {
1085 var providerName, model string
1086 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
1087 if err != nil {
1088 return err
1089 }
1090 r.Provider, r.Model = providerName, model
1091 ag.CommitToolResult = func(_ string, result core.ToolResult) error { return persistToolResultState(extMgr, sess, result) }
1092 defer func() { runErr = joinSessionCloseError(runErr, sess) }()
1093 }
1094 announceSession(extMgr, sess)
1095 wireRetryLifecyclePersistence(ag, sess)
1096 if sess != nil {
1097 defer func() { runErr = errors.Join(runErr, sess.FlushRetryLifecycle(ag.LastTurnUsage(), ag.Cost())) }()
1098 }
1099
1100 piped, _ := readAllStdin()
1101 prompt := combinePromptInput(piped, args.Prompt)
1102 if prompt == "" {
1103 return fmt.Errorf("stream mode requires a prompt (arg or stdin)")
1104 }
1105
1106 start := len(ag.Messages())
1107 preSink, finishPre := newStreamTextSink(os.Stdout)
1108 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, preSink, os.Stderr); err != nil {
1109 finishPre()
1110 return err
1111 }
1112 finishPre()
1113 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
1114 return err
1115 }
1116 var persistCompaction func([]provider.Message) error
1117 if sess != nil {
1118 persistCompaction = sess.AppendCompaction
1119 }
1120 recovery, err := modes.RunStreamWithContextRecovery(ctx, ag, prompt, nil, os.Stdout, os.Stderr, persistCompaction)
1121 transcriptStart := start
1122 if recovery.Compacted {
1123 transcriptStart = recovery.OutputStart
1124 }
1125 if persistErr := WriteNewTranscript(ag, sess, transcriptStart); persistErr != nil {
1126 if err != nil {
1127 return errors.Join(err, persistErr)
1128 }
1129 return persistErr
1130 }
1131 return err
1132}
1133
1134func newStreamTextSink(out io.Writer) (func(core.AgentEvent), func()) {
1135 var streamed, wroteText, lastWasNL bool
1136 writeText := func(text string) {
1137 if text == "" {
1138 return
1139 }
1140 _, _ = fmt.Fprint(out, text)
1141 if syncer, ok := out.(interface{ Sync() error }); ok {
1142 _ = syncer.Sync()
1143 }
1144 wroteText = true
1145 lastWasNL = strings.HasSuffix(text, "\n")
1146 }
1147 sink := func(ev core.AgentEvent) {
1148 switch e := ev.(type) {
1149 case core.EvAssistantStart:
1150 streamed = false
1151 case core.EvTextDelta:
1152 streamed = true
1153 writeText(e.Delta)
1154 case core.EvAssistantMessage:
1155 if streamed {
1156 return
1157 }
1158 var text strings.Builder
1159 for _, content := range e.Message.Content {
1160 if block, ok := content.(provider.TextBlock); ok {
1161 if text.Len() > 0 {
1162 text.WriteString("\n")
1163 }
1164 text.WriteString(block.Text)
1165 }
1166 }
1167 writeText(text.String())
1168 }
1169 }
1170 finish := func() {
1171 if wroteText && !lastWasNL {
1172 writeText("\n")
1173 }
1174 }
1175 return sink, finish
1176}
1177
1178func runJSONMode(ctx context.Context, args Args, version string) (runErr error) {
1179 if args.Orchestrate {
1180 return runOrchestratedJSONMode(ctx, args, version)
1181 }
1182 if args.NoYolo {
1183 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in json mode (no interactive prompt available); tools will run without confirmation")
1184 }
1185 r, err := Resolve(args, true)
1186 if err != nil {
1187 return err
1188 }
1189 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
1190 defer stopExt()
1191
1192 ag := r.NewAgent()
1193 initialAg := ag
1194 defer func() {
1195 closeAgentLSP(ag)
1196 if ag != initialAg {
1197 closeAgentLSP(initialAg)
1198 }
1199 }()
1200 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
1201 sess, err := openOrCreateSession(ctx, args, r, ag, version)
1202 if err != nil {
1203 return err
1204 }
1205 if sess != nil {
1206 var providerName, model string
1207 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
1208 if err != nil {
1209 return err
1210 }
1211 r.Provider, r.Model = providerName, model
1212 ag.CommitToolResult = func(_ string, result core.ToolResult) error { return persistToolResultState(extMgr, sess, result) }
1213 defer func() { runErr = joinSessionCloseError(runErr, sess) }()
1214 }
1215 announceSession(extMgr, sess)
1216 wireRetryLifecyclePersistence(ag, sess)
1217 if sess != nil {
1218 defer func() { runErr = errors.Join(runErr, sess.FlushRetryLifecycle(ag.LastTurnUsage(), ag.Cost())) }()
1219 }
1220
1221 piped, _ := readAllStdin()
1222 prompt := combinePromptInput(piped, args.Prompt)
1223 if prompt == "" {
1224 return fmt.Errorf("json mode requires a prompt (arg or stdin)")
1225 }
1226
1227 start := len(ag.Messages())
1228 enc := json.NewEncoder(os.Stdout)
1229 preSink := func(ev core.AgentEvent) {
1230 _ = enc.Encode(modes.EventToJSON(ev))
1231 }
1232 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, preSink, os.Stderr); err != nil {
1233 _ = enc.Encode(map[string]any{"type": "error", "message": err.Error()})
1234 return err
1235 }
1236 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
1237 _ = enc.Encode(map[string]any{"type": "error", "message": err.Error()})
1238 return err
1239 }
1240 var persistCompaction func([]provider.Message) error
1241 if sess != nil {
1242 persistCompaction = sess.AppendCompaction
1243 }
1244 recovery, err := modes.RunJSONWithContextRecovery(ctx, ag, prompt, nil, os.Stdout, persistCompaction)
1245 transcriptStart := start
1246 if recovery.Compacted {
1247 transcriptStart = recovery.OutputStart
1248 }
1249 if persistErr := WriteNewTranscript(ag, sess, transcriptStart); persistErr != nil {
1250 finalErr := persistErr
1251 if err != nil {
1252 finalErr = errors.Join(err, persistErr)
1253 }
1254 _ = enc.Encode(map[string]any{"type": "error", "message": finalErr.Error()})
1255 return finalErr
1256 }
1257 return err
1258}
1259
1260// runZutfileStartupPre runs entry.pre before the main non-interactive prompt.
1261// "!command" values execute via BashTool; other values are sent as an agent turn.
1262// shellOut receives live shell chunks (typically os.Stderr); sink receives
1263// agent events for plain-text pre (stream mode wires a live text sink).
1264func runZutfileStartupPre(ctx context.Context, pre, cwd string, sandbox *tools.Sandbox, ag *core.Agent, sink func(core.AgentEvent), shellOut io.Writer) error {
1265 pre = strings.TrimSpace(pre)
1266 if pre == "" {
1267 return nil
1268 }
1269 if cmd, ok := modes.ShellEscapeCommand(pre); ok {
1270 raw, err := json.Marshal(map[string]any{
1271 "command": cmd,
1272 "timeout": modes.ShellEscapeTimeoutSeconds,
1273 })
1274 if err != nil {
1275 return err
1276 }
1277 if shellOut != nil {
1278 fmt.Fprintf(shellOut, "$ %s\n", cmd)
1279 if f, ok := shellOut.(interface{ Sync() error }); ok {
1280 _ = f.Sync()
1281 }
1282 }
1283 progress := func(chunk string) {
1284 if shellOut == nil || chunk == "" {
1285 return
1286 }
1287 fmt.Fprint(shellOut, chunk)
1288 if f, ok := shellOut.(interface{ Sync() error }); ok {
1289 _ = f.Sync()
1290 }
1291 }
1292 bash := &tools.BashTool{CWD: cwd, Sandbox: sandbox}
1293 res, err := bash.Execute(ctx, raw, progress)
1294 if err != nil {
1295 return fmt.Errorf("zutfile entry.pre: %w", err)
1296 }
1297 if res.IsError {
1298 var sb strings.Builder
1299 for _, c := range res.Content {
1300 if tb, ok := c.(provider.TextBlock); ok {
1301 sb.WriteString(tb.Text)
1302 }
1303 }
1304 msg := strings.TrimSpace(sb.String())
1305 if msg == "" {
1306 msg = "command failed"
1307 }
1308 return fmt.Errorf("zutfile entry.pre: %s", msg)
1309 }
1310 return nil
1311 }
1312 if ag == nil {
1313 return fmt.Errorf("zutfile entry.pre requires an agent for non-shell prompts")
1314 }
1315 if sink == nil {
1316 sink = func(core.AgentEvent) {}
1317 }
1318 return ag.Prompt(ctx, pre, nil, sink)
1319}
1320
1321var errInteractiveAgentChanged = errors.New("interactive agent or web-search policy changed during prompt refresh")
1322
1323// refreshAgentToolsAndPrompt re-resolves tools (including rediscovered
1324// skills and currently loaded extension tools) and updates the live
1325// agent's registry and system prompt. Used after /reload-ext and after
1326// zutfile entry.pre installs new skills or extensions.
1327// mutateRegistry, if non-nil, can inject session-specific tools (e.g. subagent_spawn).
1328// interactive, when non-nil, serializes the final commit with agent replacement.
1329func refreshAgentToolsAndPrompt(args Args, sharedSandbox *tools.Sandbox, extToolAdapter ExtensionToolSource, ag *core.Agent, mutateRegistry func(core.Registry) core.Registry, interactive *modes.Interactive) (subagents.WebSearchPolicy, error) {
1330 if ag == nil {
1331 return subagents.WebSearchDeny, nil
1332 }
1333 var webSearchPolicyGeneration uint64
1334 if interactive != nil {
1335 // Capture before Resolve: the final commit must fail if settings,
1336 // Telegram attachment, or a newer registry commit changes policy while
1337 // filesystem/config/extension discovery is in flight.
1338 webSearchPolicyGeneration = interactive.WebSearchPolicyGeneration()
1339 }
1340 resolved, err := Resolve(args, true)
1341 if err != nil {
1342 return subagents.WebSearchDeny, fmt.Errorf("refresh agent prompt and tools: %w", err)
1343 }
1344 if sharedSandbox != nil {
1345 resolved.UseSandbox(sharedSandbox)
1346 }
1347 if extToolAdapter != nil {
1348 resolved.MergeExtensionTools(extToolAdapter)
1349 }
1350 reg := resolved.ToolRegistry
1351 if resolved.WebSearchPolicy != subagents.WebSearchAllow {
1352 delete(reg, "web_search")
1353 }
1354 if mutateRegistry != nil {
1355 reg = mutateRegistry(reg)
1356 }
1357 if interactive != nil {
1358 oldTools, applied := interactive.ApplyAgentPromptConfigAtWebSearchGeneration(ag, resolved.SystemPrompt, reg, webSearchPolicyGeneration)
1359 if !applied {
1360 _ = tools.CloseLSPManagers(reg)
1361 return subagents.WebSearchDeny, errInteractiveAgentChanged
1362 }
1363 interactive.DeferUntilIdle(func() {
1364 _ = tools.CloseLSPManagers(oldTools)
1365 })
1366 return webSearchPolicyForRegistry(resolved.WebSearchPolicy, ag.ToolsSnapshot()), nil
1367 }
1368 oldTools := ag.SetPromptConfig(resolved.SystemPrompt, reg)
1369 _ = tools.CloseLSPManagers(oldTools)
1370 return webSearchPolicyForRegistry(resolved.WebSearchPolicy, reg), nil
1371}
1372
1373func webSearchPolicyForRegistry(policy subagents.WebSearchPolicy, reg core.Registry) subagents.WebSearchPolicy {
1374 if policy == subagents.WebSearchAllow {
1375 if _, ok := reg["web_search"]; ok {
1376 return subagents.WebSearchAllow
1377 }
1378 }
1379 return subagents.WebSearchDeny
1380}
1381
1382func webSearchToolAllowedForSession(args Args) bool {
1383 if args.NoTools || args.PermissionSet != nil {
1384 return false
1385 }
1386 if args.ToolsSet || len(args.Tools) > 0 {
1387 return toolListContains(args.Tools, "web_search")
1388 }
1389 return true
1390}
1391
1392func webSearchExplicitlyEnabledForSession(args Args) bool {
1393 return !args.NoTools && args.PermissionSet == nil && (args.ToolsSet || len(args.Tools) > 0) && toolListContains(args.Tools, "web_search")
1394}
1395
1396// reloadResourcesAfterStartupPre reloads extensions (if any) and
1397// refreshes the agent tool registry + system prompt so skills/extensions
1398// installed by entry.pre are visible to the following turn.
1399func reloadResourcesAfterStartupPre(ctx context.Context, args Args, extMgr *extensions.Manager, sharedSandbox *tools.Sandbox, ag *core.Agent) error {
1400 _, err := reloadResourcesAfterStartupPreWithRegistry(ctx, args, extMgr, sharedSandbox, ag, nil)
1401 return err
1402}
1403
1404func reloadResourcesAfterStartupPreWithRegistry(ctx context.Context, args Args, extMgr *extensions.Manager, sharedSandbox *tools.Sandbox, ag *core.Agent, mutateRegistry func(core.Registry) core.Registry) (subagents.WebSearchPolicy, error) {
1405 if strings.TrimSpace(args.StartupPre) == "" || ag == nil {
1406 return subagents.WebSearchDeny, nil
1407 }
1408 adapter := &extToolAdapter{mgr: extMgr}
1409 if extMgr != nil {
1410 _ = extMgr.Reload(ctx, 2*time.Second)
1411 }
1412 return refreshAgentToolsAndPrompt(args, sharedSandbox, adapter, ag, mutateRegistry, nil)
1413}
1414
1415// ---- interactive mode: opens the TUI even without credentials ----
1416
1417func runInteractive(ctx context.Context, args Args, version string) (runErr error) {
1418 initialCfg, _ := LoadConfig()
1419 // Resolve WITHOUT requiring credentials.
1420 r, err := Resolve(args, false)
1421 if err != nil {
1422 return err
1423 }
1424
1425 authStore := AuthStoreFor()
1426 mgr := auth.NewManager(authStore)
1427 defer mgr.Close()
1428
1429 // Keep the sandbox pointer stable across agent rebuilds (login / model
1430 // switch). The Interactive UI toggles the lock via this pointer, and
1431 // rebuilt tool instances must share the same one so the lock sticks.
1432 sharedSandbox := r.Sandbox
1433
1434 // persistMu guards the active session and selection across the agent
1435 // loop, TUI callbacks, and session swaps. Declare it before tool
1436 // construction because subagent defaults must read the live selection too.
1437 var persistMu sync.Mutex
1438 // Serialize session transitions with persistence callbacks so a candidate
1439 // is read only after the old agent is flushed and cannot be overwritten by
1440 // an in-flight append before commit.
1441 var sessionTransitionMu sync.RWMutex
1442 activeProvider := r.Provider
1443 activeModel := r.Model
1444
1445 // Build the extension manager BEFORE the agent so we can fold
1446 // extension-defined tools into the registry. Attach the interactive
1447 // host after constructing it below so startup alerts can be buffered.
1448 var iv *modes.Interactive
1449 extHooks := &interactiveExtHooks{}
1450 extMgr := extensions.New(ZutHome(), r.CWD, version, r.Provider, r.Model, extHooks)
1451 var startupExtensionErrors []string
1452 // --ext paths first so they win against installed extensions of
1453 // the same name (loadOne's first-write-wins semantics).
1454 for _, e := range extMgr.LoadExplicit(ctx, args.Exts) {
1455 startupExtensionErrors = append(startupExtensionErrors, e.Error())
1456 }
1457 // --no-ext skips the global + project-local discovery scan;
1458 // explicit --ext paths above are still honoured so you can run
1459 // "only this extension" with --no-ext --ext ./x.
1460 if !args.NoExt {
1461 for _, e := range extMgr.Discover(ctx) {
1462 startupExtensionErrors = append(startupExtensionErrors, e.Error())
1463 }
1464 }
1465 // Wait briefly for extensions to flush their initial register_tool
1466 // frames before we build the agent's tool registry. Half a second
1467 // is plenty for any extension that's actually well-behaved; ones
1468 // that don't send a ready frame eat the full grace and proceed.
1469 // 3s is the per-extension grace period for the ready frame.
1470 // Native binaries are instant; runtimes like `npx tsx` take ~1.5s
1471 // from cold cache. The wait is tight only for extensions that
1472 // haven't sent ready by then; ones that signalled earlier release
1473 // the wait immediately.
1474 extMgr.WaitForReady(3 * time.Second)
1475 defer extMgr.Stop(2 * time.Second)
1476
1477 extToolAdapter := &extToolAdapter{mgr: extMgr}
1478 r.MergeExtensionTools(extToolAdapter)
1479 webSearchGuard := &webSearchSessionGuard{}
1480
1481 // Keep the shared subagent runtime in the outer scope: session reloads,
1482 // dashboard updates, agent rebuilds, and shutdown all use the same owner.
1483 var runtime *subagentRuntime
1484 onResidentAccepted := func(spec subagents.ResidentChildSpec, _ string) {
1485 if iv != nil {
1486 iv.TrackResidentSubagent(spec.ID)
1487 }
1488 }
1489 onResidentCompletion := func(completion subagents.ResidentCompletion) {
1490 if iv != nil {
1491 iv.ReportResidentSubagent(completion)
1492 }
1493 }
1494 activeProviderForSubagents := func() string {
1495 persistMu.Lock()
1496 defer persistMu.Unlock()
1497 return activeProvider
1498 }
1499 activeModelForSubagents := func() string {
1500 persistMu.Lock()
1501 defer persistMu.Unlock()
1502 return activeModel
1503 }
1504
1505 runtime = newSubagentRuntime(subagentRuntimeConfig{
1506 Args: args,
1507 Root: filepath.Join(ZutHome(), "subagents"),
1508 RepoRoot: r.CWD,
1509 Provider: r.Provider,
1510 Model: r.Model,
1511 Reasoning: r.Reasoning,
1512 BaseURL: r.BaseURL,
1513 InsecureTLS: r.InsecureTLS,
1514 FastMode: r.FastMode,
1515 Policy: subagentPolicyFromConfig(initialCfg.Subagents),
1516 WebSearchPolicy: webSearchPolicyForRegistry(r.WebSearchPolicy, r.ToolRegistry),
1517 WebSearchGuard: webSearchGuard,
1518 ActiveProvider: activeProviderForSubagents,
1519 ActiveModel: activeModelForSubagents,
1520 OnResidentSpawned: onResidentAccepted,
1521 ResidentCompletion: onResidentCompletion,
1522 })
1523 reloadDone := make(chan struct{})
1524 var reloadErrs []error
1525 if resident := runtime.ResidentManager(); resident != nil {
1526 // Resident reconciliation reads only the new journal format. It marks
1527 // active durable work interrupted and exposes it for an explicit new
1528 // prompt; it never constructs a child or replays an accepted task.
1529 go func() {
1530 reloadErrs = resident.Reconcile()
1531 close(reloadDone)
1532 }()
1533 } else {
1534 close(reloadDone)
1535 }
1536 defer func() {
1537 <-reloadDone
1538 _ = closeSubagentRuntimeFresh(runtime)
1539 }()
1540
1541 prepareInteractiveRegistry := runtime.PrepareRegistry
1542 prepareResolvedInteractiveRegistry := runtime.PrepareResolvedRegistry
1543 prepareResolvedInteractiveRegistry(r.ToolRegistry, r.WebSearchPolicy)
1544 initialWebSearchPolicy := webSearchPolicyForRegistry(r.WebSearchPolicy, r.ToolRegistry)
1545 webSearchGuard.setAvailable(initialWebSearchPolicy == subagents.WebSearchAllow)
1546 runtime.SetWebSearchPolicy(initialWebSearchPolicy)
1547 resolveSubagent := runtime.resolveSubagent
1548
1549 // Confirmation gate: when --no-yolo is on, the agent must ask
1550 // the user before every tool call. In interactive mode the TUI
1551 // provides the Confirmer; in print/json/rpc modes there's no
1552 // way to prompt, so the gate is constructed with a nil inner
1553 // which auto-refuses every call with a helpful reason.
1554 var confirmGate *core.ConfirmGate
1555 if args.NoYolo {
1556 confirmGate = core.NewConfirmGate(nil) // set below for interactive
1557 }
1558
1559 // Capture current args in a closure so BuildAgent can re-resolve
1560 // after a successful login (picks up the newly stored credential).
1561 wireAgentExt := func(a *core.Agent) *core.Agent {
1562 if a == nil {
1563 return a
1564 }
1565 a.BeforeToolExecute = func(call provider.ToolCallBlock) (bool, string, json.RawMessage) {
1566 // Guards run before confirmation because they may rewrite the
1567 // arguments. The user must approve the effective call that will
1568 // actually execute, not the model's original arguments.
1569 r := extMgr.InterceptToolCall(ctx, call.ID, call.Name, call.Arguments)
1570 if r.Block {
1571 return false, r.Reason, nil
1572 }
1573 effectiveArgs := call.Arguments
1574 if len(r.ModifiedArgs) > 0 && json.Valid(r.ModifiedArgs) {
1575 effectiveArgs = r.ModifiedArgs
1576 }
1577 if confirmGate != nil {
1578 var content strings.Builder
1579 _, currentTools := a.PromptConfig()
1580 if tool, err := currentTools.Get(call.Name); err == nil {
1581 if previewer, ok := tool.(core.ToolPreviewer); ok {
1582 preview, err := previewer.Preview(ctx, effectiveArgs)
1583 if err != nil {
1584 return false, err.Error(), nil
1585 }
1586 for _, block := range preview.Content {
1587 if text, ok := block.(provider.TextBlock); ok {
1588 if content.Len() > 0 {
1589 content.WriteString("\n")
1590 }
1591 content.WriteString(text.Text)
1592 }
1593 }
1594 }
1595 }
1596 ok, reason, _ := confirmGate.CheckToolCall(core.ToolCallConfirmation{
1597 ID: call.ID,
1598 Name: call.Name,
1599 Summary: core.BuildPreview(effectiveArgs, 120),
1600 Content: content.String(),
1601 Origin: call.Origin,
1602 })
1603 if !ok {
1604 return false, reason, nil
1605 }
1606 }
1607 return true, "", r.ModifiedArgs
1608 }
1609 a.BeforeTurnContext = func(turnCtx context.Context, step int) (bool, string, string) {
1610 r := extMgr.InterceptTurnStart(turnCtx, step)
1611 return !r.Block, r.Reason, r.Context
1612 }
1613 a.BeforeAssistantMessage = func(text string) (bool, string, string) {
1614 r := extMgr.InterceptAssistantMessage(ctx, text)
1615 if r.Block {
1616 return false, r.Reason, ""
1617 }
1618 return true, "", r.ReplaceText
1619 }
1620 a.OnEvent = func(ev core.AgentEvent) { fanoutAgentEvent(extMgr, ev) }
1621 runtime.WireRequiredWorkerGate(a)
1622 return a
1623 }
1624
1625 var ag *core.Agent
1626 buildAgent := func() (*core.Agent, string, string, error) {
1627 resolved, err := Resolve(args, true)
1628 if err != nil {
1629 return nil, "", "", err
1630 }
1631 resolved.UseSandbox(sharedSandbox)
1632 runtime.SetProvider(resolved.Provider)
1633 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1634 runtime.SetFastMode(resolved.FastMode)
1635 resolved.MergeExtensionTools(extToolAdapter)
1636 prepareResolvedInteractiveRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
1637 return wireAgentExt(resolved.NewAgent()), resolved.Provider, resolved.Model, nil
1638 }
1639
1640 // Rebuild agent with an explicit provider/model override.
1641 buildAgentFor := func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1642 next := args
1643 if providerOverride != "" {
1644 next.Provider = providerOverride
1645 }
1646 if modelOverride != "" {
1647 next.Model = modelOverride
1648 }
1649 resolved, err := Resolve(next, true)
1650 if err != nil {
1651 return nil, "", "", err
1652 }
1653 resolved.UseSandbox(sharedSandbox)
1654 runtime.SetProvider(resolved.Provider)
1655 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1656 runtime.SetFastMode(resolved.FastMode)
1657 resolved.MergeExtensionTools(extToolAdapter)
1658 prepareResolvedInteractiveRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
1659 return wireAgentExt(resolved.NewAgent()), resolved.Provider, resolved.Model, nil
1660 }
1661
1662 // Rebuild agent for the rescue picker after a recoverable failure.
1663 // Unlike buildAgentFor, this drops launch-time --api-key and
1664 // --base-url overrides because those are typically the cause of the
1665 // rescue (a bad key, a typo'd base URL, or a corporate gateway that
1666 // only the originally-picked provider needed). Re-resolving without
1667 // them lets the rescue retry use env vars / auth.json / provider
1668 // defaults the way zut would have without the overrides.
1669 buildAgentForRescue := func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1670 next := args
1671 next.APIKey = ""
1672 next.BaseURL = ""
1673 if providerOverride != "" {
1674 next.Provider = providerOverride
1675 }
1676 if modelOverride != "" {
1677 next.Model = modelOverride
1678 }
1679 resolved, err := Resolve(next, true)
1680 if err != nil {
1681 return nil, "", "", err
1682 }
1683 resolved.UseSandbox(sharedSandbox)
1684 runtime.SetProvider(resolved.Provider)
1685 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1686 runtime.SetFastMode(resolved.FastMode)
1687 resolved.MergeExtensionTools(extToolAdapter)
1688 prepareResolvedInteractiveRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
1689 return wireAgentExt(resolved.NewAgent()), resolved.Provider, resolved.Model, nil
1690 }
1691
1692 if r.HasCredential() {
1693 ag = wireAgentExt(r.NewAgent())
1694 }
1695
1696 // /reload-ext callback: after the manager has respawned every
1697 // extension, re-resolve the tool registry (built-ins + freshly-
1698 // registered extension tools) and swap it onto the current
1699 // agent in-place. The current agent may have been replaced by a
1700 // /model swap since spawn, so re-read the live `ag` on each
1701 // invocation.
1702 extMgr.SetOnReload(func() {
1703 current := liveInteractiveAgent(iv, ag)
1704 if current == nil {
1705 return
1706 }
1707 if _, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistry, iv); err != nil && iv != nil {
1708 iv.ReportError(err)
1709 }
1710 })
1711
1712 var sess *core.Session
1713 var sessBaselineMsgs int // messages already on disk when current session opened
1714 var sessionTitlePending bool
1715 if !args.NoSess && ag != nil {
1716 var sessErr error
1717 sess, sessErr = openOrCreateSession(ctx, args, r, ag, version)
1718 if sessErr != nil {
1719 return sessErr
1720 }
1721 sessBaselineMsgs = len(ag.Messages())
1722 if sess != nil {
1723 // Startup resume uses the same provider/model-aware preparation as
1724 // the interactive session picker. This matters for --continue,
1725 // --resume, and explicit --session paths whose latest meta row was
1726 // written by another provider/model.
1727 candidate, resumeErr := applySessionResume(sess, ag, r.Provider, r.Model,
1728 strings.TrimSpace(args.Provider) != "", strings.TrimSpace(args.Model) != "", buildAgentFor)
1729 if resumeErr != nil {
1730 return resumeErr
1731 }
1732 sess = candidate.session
1733 ag = candidate.agent
1734 sessBaselineMsgs = candidate.fullMessageCount
1735 activeProvider = candidate.provider
1736 activeModel = candidate.model
1737 r.Provider = candidate.provider
1738 r.Model = candidate.model
1739 }
1740 if sess != nil && ag != nil {
1741 sessionTitlePending = sess.Meta.Parent != "" && sess.Title == "" && len(ag.Messages()) <= sess.Meta.ForkPoint
1742 }
1743 }
1744 announceSession(extMgr, sess)
1745 // Print the hint after the session close defer below and all terminal/TUI
1746 // cleanup defers. Close removes a fresh empty session, so only a session
1747 // that remains discoverable through the hinted command gets a hint.
1748 defer func() {
1749 if !iv.ExitedViaCtrlC() {
1750 return
1751 }
1752 persistMu.Lock()
1753 current := sess
1754 persistMu.Unlock()
1755 hasMessages := false
1756 if finalAg := iv.Agent(); finalAg != nil {
1757 hasMessages = finalAg.MessageCount() > 0
1758 }
1759 if resumeID := resumableSessionID(ZutHome(), current, hasMessages); resumeID != "" {
1760 fmt.Print(resumeSessionHint(resumeID))
1761 }
1762 }()
1763 defer func() {
1764 persistMu.Lock()
1765 defer persistMu.Unlock()
1766 runErr = joinSessionCloseError(runErr, sess)
1767 }()
1768
1769 // persistMessage is the per-message hook bound to the agent. It
1770 // appends each new transcript message to the live session as soon
1771 // as it lands, so a kill / closed terminal / OS crash costs at
1772 // most the in-flight turn instead of the whole session. The
1773 // baseline counter advances in lock-step so the exit-time flush
1774 // doesn't double-write rows already on disk.
1775 persistMessage := func(m provider.Message) {
1776 sessionTransitionMu.RLock()
1777 defer sessionTransitionMu.RUnlock()
1778 persistMu.Lock()
1779 defer persistMu.Unlock()
1780 if sess == nil {
1781 return
1782 }
1783 if err := sess.AppendMessage(m); err == nil {
1784 sessBaselineMsgs++
1785 }
1786 }
1787 persistUsage := func(cum provider.Usage) {
1788 sessionTransitionMu.RLock()
1789 defer sessionTransitionMu.RUnlock()
1790 persistMu.Lock()
1791 defer persistMu.Unlock()
1792 if sess == nil {
1793 return
1794 }
1795 _ = sess.AppendUsage(cum, cum)
1796 }
1797 persistRetryLifecycle := func(record core.RetryLifecycleRecord) {
1798 sessionTransitionMu.RLock()
1799 defer sessionTransitionMu.RUnlock()
1800 persistMu.Lock()
1801 defer persistMu.Unlock()
1802 if sess != nil {
1803 sess.RecordRetryLifecycle(record)
1804 }
1805 }
1806 persistCompaction := func(messages []provider.Message) {
1807 sessionTransitionMu.RLock()
1808 var session *extproto.SessionContext
1809 var states map[string]json.RawMessage
1810 persistMu.Lock()
1811 if sess != nil {
1812 if err := sess.AppendCompaction(messages); err == nil {
1813 sessBaselineMsgs = len(messages)
1814 session = sessionContext(sess)
1815 states = copyExtensionStates(sess.ExtensionState)
1816 }
1817 }
1818 persistMu.Unlock()
1819 sessionTransitionMu.RUnlock()
1820 if session != nil {
1821 extMgr.EmitSessionEvent("session_compacted", session, states)
1822 }
1823 }
1824 persistCompactHandoff := func(state json.RawMessage) error {
1825 sessionTransitionMu.RLock()
1826 defer sessionTransitionMu.RUnlock()
1827 persistMu.Lock()
1828 defer persistMu.Unlock()
1829 if sess == nil {
1830 return nil
1831 }
1832 return sess.UpdateCompactHandoff(state)
1833 }
1834 currentCompactHandoff := func() json.RawMessage {
1835 persistMu.Lock()
1836 defer persistMu.Unlock()
1837 if sess == nil {
1838 return nil
1839 }
1840 return append(json.RawMessage(nil), sess.Meta.CompactHandoff...)
1841 }
1842 persistGoal := func(goal *core.SessionGoal) error {
1843 sessionTransitionMu.RLock()
1844 defer sessionTransitionMu.RUnlock()
1845 persistMu.Lock()
1846 defer persistMu.Unlock()
1847 if sess == nil {
1848 return errors.New("session persistence is disabled")
1849 }
1850 return sess.UpdateGoal(goal)
1851 }
1852 ensureMission := func(objective string) error {
1853 sessionTransitionMu.RLock()
1854 defer sessionTransitionMu.RUnlock()
1855 persistMu.Lock()
1856 defer persistMu.Unlock()
1857 if sess == nil {
1858 return errors.New("session persistence is disabled")
1859 }
1860 return sess.EnsureMission(objective, core.MissionSourceUser)
1861 }
1862 currentGoal := func() *core.SessionGoal {
1863 persistMu.Lock()
1864 defer persistMu.Unlock()
1865 if sess == nil || sess.Meta.Goal == nil {
1866 return nil
1867 }
1868 goal := *sess.Meta.Goal
1869 return &goal
1870 }
1871 currentGoalHistory := func() []core.SessionGoal {
1872 persistMu.Lock()
1873 defer persistMu.Unlock()
1874 if sess == nil {
1875 return nil
1876 }
1877 return append([]core.SessionGoal(nil), sess.Meta.GoalHistory...)
1878 }
1879 bindAgentToolResultSession := func(a *core.Agent, boundSession *core.Session) {
1880 if a == nil {
1881 return
1882 }
1883 a.CommitToolResult = func(_ string, result core.ToolResult) error {
1884 persistMu.Lock()
1885 defer persistMu.Unlock()
1886 return persistToolResultState(extMgr, boundSession, result)
1887 }
1888 }
1889 wireAgentPersist := func(a *core.Agent) *core.Agent {
1890 if a == nil {
1891 return a
1892 }
1893 persistMu.Lock()
1894 currentSession := sess
1895 persistMu.Unlock()
1896 if currentSession != nil {
1897 a.SetSessionTimeContext(currentSession.Meta.Started, currentSession.Meta.Timezone, currentSession.Meta.TimezoneOffset)
1898 }
1899 a.OnMessageAppended = persistMessage
1900 a.OnUsage = persistUsage
1901 a.OnRetryLifecycle = persistRetryLifecycle
1902 a.OnTranscriptCompacted = persistCompaction
1903 bindAgentToolResultSession(a, currentSession)
1904 return a
1905 }
1906 wireAgentPersist(ag)
1907 defer func() {
1908 closeAgentLSP(liveInteractiveAgent(iv, ag))
1909 closeResolvedLSP(r)
1910 }()
1911
1912 // Re-wrap the build closures so any agent constructed by the TUI
1913 // (login, /model swap to a different provider) also gets the
1914 // persistence hooks. Without this, switching provider would
1915 // silently revert to the old in-memory-only behaviour. Selection state
1916 // is published by the successful transition itself, not by preparation.
1917 baseBuildAgent := buildAgent
1918 buildAgent = func() (*core.Agent, string, string, error) {
1919 a, p, m, err := baseBuildAgent()
1920 return wireAgentPersist(a), p, m, err
1921 }
1922 baseBuildAgentFor := buildAgentFor
1923 buildAgentFor = func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1924 a, p, m, err := baseBuildAgentFor(providerOverride, modelOverride)
1925 return wireAgentPersist(a), p, m, err
1926 }
1927 baseBuildAgentForRescue := buildAgentForRescue
1928 buildAgentForRescue = func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1929 a, p, m, err := baseBuildAgentForRescue(providerOverride, modelOverride)
1930 return wireAgentPersist(a), p, m, err
1931 }
1932
1933 // loadSession replaces the current session with the one at path and
1934 // hands its messages to the agent. Used by the /sessions picker.
1935 loadSession := func(path string) (loadErr error) {
1936 // Hold the transition lock from the pre-flush through the commit.
1937 // Persistence callbacks take the read side, so an active session
1938 // cannot be snapshotted before its lazy writes land or overwritten by
1939 // a callback while the candidate is being installed.
1940 sessionTransitionMu.Lock()
1941 defer sessionTransitionMu.Unlock()
1942
1943 currentAg := liveInteractiveAgent(iv, ag)
1944 if currentAg == nil {
1945 return fmt.Errorf("no agent running; log in first")
1946 }
1947
1948 persistMu.Lock()
1949 currentProvider := activeProvider
1950 currentModel := activeModel
1951 oldSess := sess
1952 // Flush before reading the candidate. Use the locked form rather
1953 // than the public callback, which would acquire the read lock held
1954 // by this transition.
1955 if oldSess != nil {
1956 next, flushErr := writeNewTranscriptLocked(currentAg, oldSess, sessBaselineMsgs)
1957 sessBaselineMsgs = next
1958 if flushErr != nil {
1959 persistMu.Unlock()
1960 return fmt.Errorf("flush current session: %w", flushErr)
1961 }
1962 }
1963 currentMessageCount := len(currentAg.Messages())
1964 currentCost := currentAg.Cost()
1965 persistMu.Unlock()
1966
1967 // A candidate build must not publish its provider/model as the live
1968 // selection before the candidate commits. The builder also stages
1969 // provider settings on the shared runtime, so restore those settings on
1970 // every failed path, including errors returned during preparation.
1971 runtimeConfig := runtime.snapshotConfiguration()
1972 committed := false
1973 var candidate sessionResumeCandidate
1974 defer func() {
1975 if !committed {
1976 runtime.restoreConfiguration(runtimeConfig)
1977 loadErr = joinSessionCloseError(loadErr, candidate.session)
1978 }
1979 }()
1980 candidate, err := prepareSessionResume(path, currentAg, currentProvider, currentModel, baseBuildAgentFor)
1981 if err != nil {
1982 // prepareSessionResume closes its append handle on failure;
1983 // no live agent or session has been changed.
1984 return err
1985 }
1986
1987 // Wire the private candidate before it can become visible. This is
1988 // also required for legacy same-provider resumes, where the current
1989 // agent is reused and only its transcript/usage are refreshed.
1990 wireAgentPersist(candidate.agent)
1991
1992 persistMu.Lock()
1993 // A provider rebuild ran outside persistMu. Refuse to install it if
1994 // the live agent, session, selection, transcript, or cost changed in
1995 // the meantime; otherwise a slow resume could discard a newer turn or
1996 // model swap.
1997 live := liveInteractiveAgent(iv, ag)
1998 changed := sess != oldSess || activeProvider != currentProvider || activeModel != currentModel || live != currentAg
1999 if !changed && live != nil {
2000 changed = len(live.Messages()) != currentMessageCount || live.Cost() != currentCost
2001 }
2002 if changed {
2003 persistMu.Unlock()
2004 return fmt.Errorf("session changed while loading; please try again")
2005 }
2006 newStates := copyExtensionStates(candidate.session.ExtensionState)
2007 var oldCloseErr error
2008 if oldSess != nil {
2009 oldCloseErr = oldSess.Close()
2010 }
2011 sess = candidate.session
2012 bindAgentToolResultSession(candidate.agent, candidate.session)
2013 candidate.agent.SetSessionTimeContext(candidate.session.Meta.Started, candidate.session.Meta.Timezone, candidate.session.Meta.TimezoneOffset)
2014 sessionTitlePending = candidate.session != nil && candidate.session.Meta.Parent != "" && candidate.session.Title == "" && candidate.fullMessageCount <= candidate.session.Meta.ForkPoint
2015 // The live agent only receives a compact resume window, but the
2016 // session file remains intact. Keep the persistence baseline at
2017 // the original on-disk message count so future turns append after
2018 // the full session instead of duplicating the hydrated tail.
2019 sessBaselineMsgs = candidate.fullMessageCount
2020
2021 if candidate.rebuilt {
2022 // Commit the TUI agent while persistMu still protects the session
2023 // writer, so no new message can land on the old file between the
2024 // two state changes.
2025 if iv != nil {
2026 iv.ApplySessionAgentWithCompactHandoff(candidate.agent, candidate.provider, candidate.model, candidate.session.Meta.CompactHandoff)
2027 }
2028 ag = candidate.agent
2029 } else {
2030 currentAg.SetMessages(candidate.messages)
2031 currentAg.SeedCost(candidate.cumulative)
2032 currentAg.SeedLastTurnUsage(candidate.lastTurn)
2033 ag = currentAg
2034 }
2035 activeProvider = candidate.provider
2036 activeModel = candidate.model
2037 if candidate.session != nil {
2038 // Keep the resident parent's session association in the same commit
2039 // as the session, agent, usage, and persistence baseline.
2040 runtime.SetActiveSession(candidate.session.ID)
2041 if iv != nil {
2042 iv.SetSubagentSessionScope(candidate.session.ID)
2043 }
2044 }
2045 committed = true
2046 persistMu.Unlock()
2047 if iv != nil {
2048 iv.RefreshGoal()
2049 }
2050 if candidate.session.Meta.Parent != "" {
2051 extMgr.EmitSessionEvent("session_forked", sessionContext(candidate.session), newStates)
2052 }
2053 extMgr.EmitSessionEvent("session_switched", sessionContext(candidate.session), newStates)
2054 if oldCloseErr != nil {
2055 return fmt.Errorf("close current session: %w", oldCloseErr)
2056 }
2057 return nil
2058 }
2059
2060 // changeCWD switches the running session to a new working directory.
2061 // Wired into InteractiveConfig.ChangeCWD and invoked by the hidden
2062 // /cd slash command (which itself is only fired by the workspaces
2063 // extension's panel-key Enter handler today; the user can type /cd
2064 // directly but it's not in autocomplete / help / the README).
2065 //
2066 // Steps, in order:
2067 // 1. resolve + validate the new path (~ expansion, abs/rel)
2068 // 2. stage the candidate cwd, sandbox, and subagent state
2069 // 3. rebuild the agent and allocate its new session
2070 // 4. commit all new state together, closing the old session last
2071 // 5. push the committed state into the running Interactive
2072 //
2073 // The /jail state is preserved verbatim: if the sandbox was locked
2074 // to the old cwd, it stays locked, just re-pointed at the new one.
2075 changeCWD := func(path string) error {
2076 sessionTransitionMu.Lock()
2077 defer sessionTransitionMu.Unlock()
2078 if path == "" {
2079 return fmt.Errorf("empty path")
2080 }
2081 // ~ expansion.
2082 if path == "~" || strings.HasPrefix(path, "~/") {
2083 home, herr := os.UserHomeDir()
2084 if herr != nil || home == "" {
2085 return fmt.Errorf("cannot expand ~: %v", herr)
2086 }
2087 if path == "~" {
2088 path = home
2089 } else {
2090 path = filepath.Join(home, path[2:])
2091 }
2092 }
2093 if !filepath.IsAbs(path) {
2094 path = filepath.Join(args.CWD, path)
2095 }
2096 absPath, err := filepath.Abs(path)
2097 if err != nil {
2098 return err
2099 }
2100 info, err := os.Stat(absPath)
2101 if err != nil {
2102 return err
2103 }
2104 if !info.IsDir() {
2105 return fmt.Errorf("not a directory: %s", absPath)
2106 }
2107
2108 currentAg := liveInteractiveAgent(iv, ag)
2109 if currentAg == nil {
2110 return fmt.Errorf("no agent running; log in first")
2111 }
2112
2113 // Stage the candidate state while retaining a complete rollback
2114 // snapshot. A failed rebuild or session allocation must leave the
2115 // current agent, session, sandbox, and subagent root usable.
2116 oldCWD := args.CWD
2117 oldResolvedCWD := r.CWD
2118 oldPermissionSet := args.PermissionSet
2119 persistMu.Lock()
2120 oldActiveProvider := activeProvider
2121 oldActiveModel := activeModel
2122 persistMu.Unlock()
2123 runtimeConfig := runtime.snapshotConfiguration()
2124 oldSandboxRoot := ""
2125 oldSandboxLocked := false
2126 if sharedSandbox != nil {
2127 oldSandboxRoot = sharedSandbox.Root
2128 oldSandboxLocked = sharedSandbox.Locked()
2129 }
2130 rollback := func() {
2131 args.CWD = oldCWD
2132 r.CWD = oldResolvedCWD
2133 args.PermissionSet = oldPermissionSet
2134 persistMu.Lock()
2135 activeProvider = oldActiveProvider
2136 activeModel = oldActiveModel
2137 persistMu.Unlock()
2138 runtime.restoreConfiguration(runtimeConfig)
2139 if sharedSandbox != nil {
2140 sharedSandbox.Root = oldSandboxRoot
2141 if oldSandboxLocked {
2142 sharedSandbox.Lock()
2143 } else {
2144 sharedSandbox.Unlock()
2145 }
2146 }
2147 }
2148
2149 args.CWD = absPath
2150 r.CWD = absPath
2151 runtime.SetRepoRoot(absPath)
2152 if args.PermissionSet != nil {
2153 expanded := args.PermissionSet.Expand(absPath, args.AgentDataDir)
2154 args.PermissionSet = &expanded
2155 }
2156 if sharedSandbox != nil {
2157 sharedSandbox.Root = absPath
2158 if oldSandboxLocked {
2159 sharedSandbox.Lock()
2160 } else {
2161 sharedSandbox.Unlock()
2162 }
2163 }
2164
2165 // Rebuild the agent so tools / AGENTS.md / system prompt
2166 // re-bind to the new cwd. buildAgent() reads from args + r.
2167 newAg, newProvider, newModel, berr := buildAgent()
2168 if berr != nil {
2169 rollback()
2170 return fmt.Errorf("rebuild agent: %w", berr)
2171 }
2172
2173 // Fresh session in the new cwd's bucket. We bypass
2174 // openOrCreateSession's --continue / --resume branches
2175 // because /cd's semantics are "start fresh here", matching
2176 // what relaunching `zut --cwd <path>` would do today.
2177 var newSess *core.Session
2178 if !args.NoSess {
2179 newRoot := agentSessionsRoot(ZutHome(), args)
2180 core.PruneEmptySessions(newRoot, absPath)
2181 var serr error
2182 newSess, serr = core.NewSession(newRoot, absPath, newProvider, newModel, version)
2183 if serr != nil {
2184 rollback()
2185 return fmt.Errorf("open session in %s: %w", absPath, serr)
2186 }
2187 }
2188
2189 // Invalidate any title request before swapping the host-owned session
2190 // pointer. The interactive state reset below happens after the swap,
2191 // so this guard closes the window where a late result could otherwise
2192 // be written to the new session.
2193 if iv != nil {
2194 iv.CancelPendingSessionTitle()
2195 }
2196
2197 // Commit only after every fallible operation has succeeded. Close
2198 // the old session last so rollback never has to resurrect it.
2199 var newStates map[string]json.RawMessage
2200 var oldCloseErr error
2201 persistMu.Lock()
2202 if sess != nil {
2203 next, flushErr := writeNewTranscriptLocked(currentAg, sess, sessBaselineMsgs)
2204 sessBaselineMsgs = next
2205 if flushErr != nil {
2206 persistMu.Unlock()
2207 rollbackErr := joinSessionCloseError(fmt.Errorf("flush current session: %w", flushErr), newSess)
2208 rollback()
2209 return rollbackErr
2210 }
2211 oldCloseErr = sess.Close()
2212 }
2213 sess = newSess
2214 bindAgentToolResultSession(newAg, newSess)
2215 if newSess != nil {
2216 newAg.SetSessionTimeContext(newSess.Meta.Started, newSess.Meta.Timezone, newSess.Meta.TimezoneOffset)
2217 newStates = copyExtensionStates(newSess.ExtensionState)
2218 }
2219 sessBaselineMsgs = 0
2220 sessionTitlePending = false
2221 activeProvider = newProvider
2222 activeModel = newModel
2223 persistMu.Unlock()
2224 ag = newAg
2225 closeAgentLSP(currentAg)
2226
2227 // Push the new state into the running Interactive.
2228 if iv != nil {
2229 startupPaths := instructionContextPaths(loadAgentsContext(absPath, ZutHome()))
2230 iv.ApplyChangedCWDWithStartupContext(newAg, newProvider, newModel, absPath, startupPaths)
2231 iv.RefreshGoal()
2232 }
2233
2234 // Re-scope the subagent dashboard to the new session.
2235 if newSess != nil {
2236 runtime.SetActiveSession(newSess.ID)
2237 if iv != nil {
2238 iv.SetSubagentSessionScope(newSess.ID)
2239 }
2240 }
2241 if newSess != nil {
2242 extMgr.EmitSessionEvent("session_opened", sessionContext(newSess), newStates)
2243 }
2244 if oldCloseErr != nil {
2245 return fmt.Errorf("close current session: %w", oldCloseErr)
2246 }
2247 return nil
2248 }
2249
2250 devBuild := isDevVersion(version)
2251 if devBuild {
2252 fmt.Fprintln(os.Stderr, "zut:", devVersionNotice)
2253 }
2254 term := tui.NewProcTerm()
2255
2256 var updateCh chan modes.UpdateInfo
2257 var changelogCh chan modes.ChangelogPayload
2258 if !devBuild {
2259 // Kick off the async update check so the banner can appear when the
2260 // http response eventually arrives (usually <1s on cached DNS). Map
2261 // agent.UpdateInfo -> modes.UpdateInfo here to avoid a cyclic import.
2262 updateCh = make(chan modes.UpdateInfo, 1)
2263 go func() {
2264 defer close(updateCh)
2265 src := <-CheckForUpdateAsync(ZutHome(), version)
2266 updateCh <- modes.UpdateInfo{
2267 Current: src.Current,
2268 Latest: src.Latest,
2269 Available: src.Available,
2270 URL: src.URL,
2271 }
2272 }()
2273
2274 // Changelog: when the running version differs from the last
2275 // version whose release notes the user dismissed, fetch the
2276 // release body from GitHub and have the TUI show it once. On
2277 // first-ever launch (no prior LastChangelogShown), seed the
2278 // stored version silently — don't dump release notes at someone
2279 // who just installed.
2280 changelogCh = make(chan modes.ChangelogPayload, 1)
2281 go func() {
2282 defer close(changelogCh)
2283 cfg, _ := LoadConfig()
2284 if cfg.LastChangelogShown == "" {
2285 SeedChangelogVersion(version)
2286 return
2287 }
2288 if !ShouldShowChangelog(version, cfg) {
2289 return
2290 }
2291 info := <-FetchChangelogAsync(version)
2292 if info.Body == "" {
2293 return
2294 }
2295 changelogCh <- modes.ChangelogPayload{
2296 Version: info.Version,
2297 Body: info.Body,
2298 URL: info.URL,
2299 }
2300 }()
2301 }
2302
2303 fastMode := r.FastMode
2304 quickModelShortcuts := make([]modes.QuickModelShortcut, len(initialCfg.QuickModelShortcuts))
2305 for idx, s := range initialCfg.QuickModelShortcuts {
2306 quickModelShortcuts[idx] = modes.QuickModelShortcut{Provider: s.Provider, Model: s.Model}
2307 }
2308 theme, _, themeErr := tui.DetectThemeWithCustom(ZutHome(), initialCfg.Theme, 80*time.Millisecond)
2309 if themeErr != nil {
2310 fmt.Fprintln(os.Stderr, "theme load:", themeErr)
2311 if initialCfg.Theme != "" && !tui.ThemeExists(ZutHome(), initialCfg.Theme) {
2312 initialCfg.Theme = ""
2313 _ = SaveConfig(initialCfg)
2314 }
2315 }
2316
2317 // Scope the dashboard to the active host session. The runtime owns
2318 // shutdown separately and closes the resident runtime exactly once.
2319 if sess != nil {
2320 runtime.SetActiveSession(sess.ID)
2321 }
2322
2323 var startupSkills []*skills.Skill
2324 if r.SkillTool != nil {
2325 startupSkills = r.SkillTool.Skills()
2326 }
2327 homeDir, _ := os.UserHomeDir()
2328 discoveredSubagents, _ := subagents.Discover(r.CWD, homeDir)
2329 subagentsAddendum := subagents.SystemPromptAddendum(discoveredSubagents)
2330 autoSubagentsToolAllowedForSession := autoSubagentsToolAllowed(args)
2331 autoSubagentsStatusToolAllowedForSession := autoSubagentsStatusToolAllowed(args)
2332 autoSubagentsStopToolAllowedForSession := autoSubagentsStopToolAllowed(args)
2333 autoSubagentsResumeToolAllowedForSession := autoSubagentsResumeToolAllowed(args)
2334 webSearchToolAllowedForInvocation := webSearchToolAllowedForSession(args)
2335 webSearchInvocationOverride := webSearchExplicitlyEnabledForSession(args)
2336 setWebSearchAvailable := func(available bool) {
2337 webSearchGuard.setAvailable(available)
2338 policy := subagents.WebSearchDeny
2339 if available {
2340 policy = subagents.WebSearchAllow
2341 }
2342 runtime.SetWebSearchPolicy(policy)
2343 }
2344
2345 iv = modes.NewInteractive(modes.InteractiveConfig{
2346 Terminal: term,
2347 Theme: theme,
2348 InlineImagesEnabled: initialCfg.InlineImagesEnabled,
2349 TerminalAlertsEnabled: initialCfg.TerminalAlertsEnabled,
2350 TerminalTitleEnabled: initialCfg.TerminalTitleEnabled,
2351 AutoSubagentsEnabled: initialCfg.AutoSubagentsEnabled,
2352 PonytailEnabled: initialCfg.PonytailEnabled,
2353 WebSearchEnabled: initialCfg.WebSearchEnabled,
2354 WebSearchToolAllowed: &webSearchToolAllowedForInvocation,
2355 WebSearchInvocationOverride: webSearchInvocationOverride,
2356 AutoSubagentsToolAllowed: &autoSubagentsToolAllowedForSession,
2357 AutoSubagentsStatusToolAllowed: &autoSubagentsStatusToolAllowedForSession,
2358 AutoSubagentsStopToolAllowed: &autoSubagentsStopToolAllowedForSession,
2359 AutoSubagentsResumeToolAllowed: &autoSubagentsResumeToolAllowedForSession,
2360 FastMode: &fastMode,
2361 LSPEnabled: initialCfg.LSPEnabled,
2362 SubagentLSPEnabled: initialCfg.SubagentLSPEnabled,
2363 AutoCompactThreshold: initialCfg.AutoCompactThreshold,
2364 JailByDefault: initialCfg.JailByDefault,
2365 QuickModelShortcuts: quickModelShortcuts,
2366 RecursiveFileSuggest: initialCfg.RecursiveFileSuggest,
2367 RespectGitignore: initialCfg.RespectGitignore,
2368 CompactMode: initialCfg.CompactMode,
2369 TUIInputStyle: initialCfg.TUIInputStyle,
2370 TUIStatusPosition: initialCfg.TUIStatusPosition,
2371 TUIWorkingPosition: initialCfg.TUIWorkingPosition,
2372 ThemeName: initialCfg.Theme,
2373 FlatTools: initialCfg.FlatToolRender(),
2374 CompactUser: initialCfg.CompactUserInput(),
2375 ExtensionThemes: extMgr.ThemeOptions,
2376 AutoSubagentsSystemAddendum: AutoSubagentsSystemAddendumFor(
2377 autoSubagentsToolAllowedForSession,
2378 autoSubagentsStopToolAllowedForSession,
2379 autoSubagentsResumeToolAllowedForSession,
2380 ),
2381 OnDemandSubagentsSystemAddendum: OnDemandSubagentsSystemAddendum,
2382 SubagentsSystemAddendum: subagentsAddendum,
2383 SettingsStore: configSettingsStore{},
2384 Model: r.Model,
2385 Provider: r.Provider,
2386 AuthMethod: r.AuthMethod,
2387 BaseURL: r.BaseURL,
2388 Reasoning: r.Reasoning,
2389 OnReasoningChanged: runtime.SetReasoning,
2390 SystemPrompt: r.SystemPrompt,
2391 WritingGuidance: WritingGuidance(),
2392 Tools: r.ToolRegistry,
2393 MaxSteps: r.MaxSteps,
2394 CWD: r.CWD,
2395 StartupAgentName: args.AgentName,
2396 StartupContextPaths: instructionContextPaths(r.ContextFiles),
2397 StartupExtensionNames: startupExtensionNames(extMgr.All()),
2398 StartupExtensionErrors: startupExtensionErrors,
2399 StartupSkillNames: startupSkillNames(startupSkills),
2400 ShowInstructionsAtStartup: initialCfg.ShowInstructionsAtStartup,
2401 ZutHome: ZutHome(),
2402 SessionsRoot: agentSessionsRoot(ZutHome(), args),
2403 Version: version,
2404 UpdateInfoChan: updateCh,
2405 Sandbox: sharedSandbox,
2406 Agent: ag,
2407 InitialCompactHandoff: currentCompactHandoff(),
2408 InitialSessionTitle: func() string {
2409 if sess == nil || sessionTitlePending {
2410 return ""
2411 }
2412 return sess.Title
2413 }(),
2414 InitialSessionTitlePending: sessionTitlePending,
2415 InitialInput: args.Prompt,
2416 StartupPre: args.StartupPre,
2417 OnStartupPreDone: func() {
2418 // entry.pre often installs skills/extensions; rediscover them
2419 // before the user starts a model turn.
2420 current := liveInteractiveAgent(iv, ag)
2421 if extMgr != nil {
2422 _ = extMgr.Reload(context.Background(), 2*time.Second)
2423 }
2424 if current != nil {
2425 if _, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistry, iv); err != nil {
2426 iv.ReportError(err)
2427 }
2428 }
2429 },
2430 RefreshTools: func() error {
2431 current := liveInteractiveAgent(iv, ag)
2432 webSearchPolicy, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistry, iv)
2433 if err != nil {
2434 if !errors.Is(err, errInteractiveAgentChanged) {
2435 setWebSearchAvailable(false)
2436 }
2437 return err
2438 }
2439 setWebSearchAvailable(webSearchPolicy == subagents.WebSearchAllow)
2440 return nil
2441 },
2442 SetWebSearchAvailable: setWebSearchAvailable,
2443 RefreshPrompt: func() error {
2444 current := liveInteractiveAgent(iv, ag)
2445 webSearchPolicy, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistry, iv)
2446 if err != nil {
2447 return err
2448 }
2449 setWebSearchAvailable(webSearchPolicy == subagents.WebSearchAllow)
2450 return nil
2451 },
2452 AuthManager: mgr,
2453 LlamaCPPConfig: ResolveLlamaCPPConfig,
2454 RefreshLlamaCPPModels: RefreshLlamaCPPModels,
2455 BuildAgent: buildAgent,
2456 SetKimiCLIFallbackDisabled: SetKimiCLIFallbackDisabled,
2457 BuildAgentFor: buildAgentFor,
2458 BuildAgentForRescue: buildAgentForRescue,
2459 LoggedInProviders: func() []string {
2460 var out []string
2461 seen := map[string]bool{}
2462 for _, p := range knownProviders {
2463 if CredentialAvailable(p) && !seen[p] {
2464 out = append(out, p)
2465 seen[p] = true
2466 }
2467 }
2468 // Include custom providers that have credentials stored.
2469 for p := range provider.CustomProviders() {
2470 if CredentialAvailable(p) && !seen[p] {
2471 out = append(out, p)
2472 seen[p] = true
2473 }
2474 }
2475 // Ollama models are always available (no auth needed).
2476 if !seen["ollama"] {
2477 out = append(out, "ollama")
2478 }
2479 return out
2480 },
2481 LoadSession: loadSession,
2482 ChangeCWD: changeCWD,
2483 PersistCompactHandoff: persistCompactHandoff,
2484 CurrentCompactHandoff: currentCompactHandoff,
2485 PersistGoal: persistGoal,
2486 CurrentGoal: currentGoal,
2487 CurrentGoalHistory: currentGoalHistory,
2488 EnsureMission: ensureMission,
2489 CurrentSessionPath: func() string {
2490 persistMu.Lock()
2491 defer persistMu.Unlock()
2492 if sess == nil {
2493 return ""
2494 }
2495 return sess.Path
2496 },
2497 FlushSession: func() {
2498 sessionTransitionMu.RLock()
2499 defer sessionTransitionMu.RUnlock()
2500 // Append any not-yet-persisted agent messages to the
2501 // current session file, then advance the baseline so
2502 // the final WriteNewTranscript at exit doesn't write
2503 // duplicates. Per-message persistence keeps the on-
2504 // disk file current already, so this is mostly a
2505 // defensive flush — still needed for /session export
2506 // to guarantee the exported bytes include the very
2507 // last in-flight turn.
2508 currentAg := iv.Agent()
2509 if currentAg == nil {
2510 return
2511 }
2512 persistMu.Lock()
2513 defer persistMu.Unlock()
2514 if sess == nil {
2515 return
2516 }
2517 next, flushErr := writeNewTranscriptLocked(currentAg, sess, sessBaselineMsgs)
2518 sessBaselineMsgs = next
2519 if flushErr != nil {
2520 iv.ReportError(fmt.Errorf("flush session: %w", flushErr))
2521 return
2522 }
2523 },
2524 SessionTransition: newSessionTransition(&sessionTransitionMu),
2525 Extensions: extMgr,
2526 ResidentManager: runtime.ResidentManager(),
2527 SpawnResident: func(ctx context.Context, request tools.ResidentSpawnRequest) (string, error) {
2528 manager := runtime.ResidentManager()
2529 if manager == nil {
2530 return "", errors.New("resident runtime is unavailable")
2531 }
2532 catalogue := r.ToolRegistry
2533 if iv != nil && iv.Agent() != nil {
2534 catalogue = iv.Agent().ToolsSnapshot()
2535 }
2536 spec, err := runtime.buildResidentChildSpec(ctx, request, catalogue)
2537 if err != nil {
2538 return "", err
2539 }
2540 if _, err := manager.Spawn(ctx, spec, request.Task); err != nil {
2541 return "", err
2542 }
2543 return spec.ID, nil
2544 },
2545 BuildResidentSpec: func(ctx context.Context, request tools.ResidentSpawnRequest) (subagents.ResidentChildSpec, error) {
2546 catalogue := r.ToolRegistry
2547 if iv != nil && iv.Agent() != nil {
2548 catalogue = iv.Agent().ToolsSnapshot()
2549 }
2550 return runtime.buildResidentChildSpec(ctx, request, catalogue)
2551 },
2552 ResolveSubagent: resolveSubagent,
2553 ChangelogChan: changelogCh,
2554 OnChangelogDismiss: func() {
2555 // For development builds, store the actual release version
2556 // so the same changelog doesn't show again next launch.
2557 // For real builds, store the binary version.
2558 v := version
2559 if devBuild {
2560 if iv != nil && iv.ChangelogVersion() != "" {
2561 v = iv.ChangelogVersion()
2562 }
2563 }
2564 _ = MarkChangelogShown(v)
2565 },
2566 SkillSnapshot: func() []*skills.Skill {
2567 if args.NoSkill {
2568 // --no-skill: nothing for the picker to show.
2569 return nil
2570 }
2571 // Re-discover so the picker reflects edits made during
2572 // the session. Cheap; SKILL.md files are small. Filter
2573 // out built-in skills — they're hidden from user-facing
2574 // surfaces because they're implementation detail; the
2575 // model still sees them through the system-prompt
2576 // manifest and the skill tool.
2577 userHome, _ := os.UserHomeDir()
2578 list, _ := skills.Discover(ZutHome(), r.CWD, userHome, args.WithSkills)
2579 list = mergeExtensionSkills(skills.NewTool(list), extMgr.Skills())
2580 return skills.VisibleSkills(list)
2581 },
2582 NoYolo: args.NoYolo,
2583 ConfirmGate: confirmGate,
2584 PersistModel: newPersistModelCallback(&persistMu, &sess, &activeProvider, &activeModel, func(message string) {
2585 if iv != nil {
2586 iv.Notify("session", "error", message)
2587 }
2588 }),
2589 CurrentSessionTitle: func() string {
2590 sessionTransitionMu.RLock()
2591 defer sessionTransitionMu.RUnlock()
2592 persistMu.Lock()
2593 defer persistMu.Unlock()
2594 if sess == nil || sessionTitlePending {
2595 return ""
2596 }
2597 return sess.Title
2598 },
2599 CurrentSessionTitlePending: func() bool {
2600 sessionTransitionMu.RLock()
2601 defer sessionTransitionMu.RUnlock()
2602 persistMu.Lock()
2603 defer persistMu.Unlock()
2604 return sessionTitlePending
2605 },
2606 PersistTitle: func(title string) error {
2607 persistMu.Lock()
2608 defer persistMu.Unlock()
2609 if sess == nil {
2610 return nil
2611 }
2612 if err := sess.UpdateTitle(title); err != nil {
2613 return err
2614 }
2615 sessionTitlePending = false
2616 return nil
2617 },
2618 OnSessionTitleChanged: func(title string) {
2619 sessionTransitionMu.RLock()
2620 defer sessionTransitionMu.RUnlock()
2621 persistMu.Lock()
2622 defer persistMu.Unlock()
2623 if sess != nil {
2624 sess.Title = title
2625 sessionTitlePending = false
2626 }
2627 },
2628 })
2629 extHooks.attachInteractive(iv)
2630 go func() {
2631 <-reloadDone
2632 for _, reloadErr := range reloadErrs {
2633 if reloadErr != nil {
2634 iv.ReportError(fmt.Errorf("reload subagents: %w", reloadErr))
2635 }
2636 }
2637 }()
2638
2639 // Bind the interactive TUI as the Confirmer. We deferred this
2640 // until now because the gate is constructed before the TUI
2641 // (the BeforeToolExecute closure captures it). SetConfirmer
2642 // is mutex-guarded on the gate so this is safe.
2643 if confirmGate != nil {
2644 confirmGate.SetConfirmer(&confirmationEventConfirmer{
2645 inner: iv,
2646 emit: extMgr.EmitEvent,
2647 })
2648 }
2649
2650 // Signal-driven flush: a SIGTERM / SIGHUP to the zut process
2651 // (closed terminal window, system shutdown, kill) used to lose
2652 // the entire in-memory transcript because the deferred post-Run
2653 // flush below never ran. Per-message persistence above covers
2654 // most of it; this handler writes any in-flight remainder and
2655 // then exits the process so we don't double-paint over a
2656 // broken terminal that the TUI's restore deferreds can no
2657 // longer fix from a signal context.
2658 //
2659 // SIGINT is intentionally NOT handled here — the TUI consumes
2660 // Ctrl+C as a regular key event for cancel/clear semantics, and
2661 // installing a SIGINT notifier here would swallow it.
2662 sigCh := make(chan os.Signal, 1)
2663 signal.Notify(sigCh, syscall.SIGTERM, syscall.SIGHUP)
2664 defer signal.Stop(sigCh)
2665 go func() {
2666 _, ok := <-sigCh
2667 if !ok {
2668 return
2669 }
2670 finalAg := iv.Agent()
2671 if finalAg != nil {
2672 persistMu.Lock()
2673 if sess != nil {
2674 next, flushErr := writeNewTranscriptLocked(finalAg, sess, sessBaselineMsgs)
2675 sessBaselineMsgs = next
2676 if flushErr != nil {
2677 fmt.Fprintf(os.Stderr, "flush session: %v\n", flushErr)
2678 }
2679 if closeErr := sess.Close(); closeErr != nil {
2680 fmt.Fprintf(os.Stderr, "close session: %v\n", closeErr)
2681 }
2682 sess = nil
2683 }
2684 persistMu.Unlock()
2685 }
2686 closeAgentLSP(finalAg)
2687 closeResolvedLSP(r)
2688 // Stop supervised workers before exiting. os.Exit skips deferred
2689 // cleanup, so wait for reload and close the shared runtime explicitly.
2690 <-reloadDone
2691 _ = closeSubagentRuntimeFresh(runtime)
2692 // Exit cleanly. Re-raising the signal would skip os.Exit's
2693 // at-exit hooks; explicit exit is fine because we've already
2694 // flushed the only at-risk state (the session file) and stopped
2695 // supervised workers.
2696 os.Exit(0)
2697 }()
2698
2699 runErr = iv.Run(ctx)
2700
2701 // Flush final transcript to session (only if we had / ended up with an agent).
2702 if finalAg := iv.Agent(); finalAg != nil {
2703 persistMu.Lock()
2704 if sess != nil {
2705 next, flushErr := writeNewTranscriptLocked(finalAg, sess, sessBaselineMsgs)
2706 sessBaselineMsgs = next
2707 if flushErr != nil {
2708 runErr = errors.Join(runErr, fmt.Errorf("flush session: %w", flushErr))
2709 }
2710 }
2711 persistMu.Unlock()
2712 }
2713 return runErr
2714}
2715
2716func resumableSessionID(root string, sess *core.Session, hasMessages bool) string {
2717 if !hasMessages || sess == nil || sess.ID == "" || sess.Path == "" {
2718 return ""
2719 }
2720 managedRoot, err := filepath.Abs(filepath.Join(root, "sessions"))
2721 if err != nil {
2722 return ""
2723 }
2724 path, err := filepath.Abs(sess.Path)
2725 if err != nil {
2726 return ""
2727 }
2728 rel, err := filepath.Rel(managedRoot, path)
2729 if err != nil || rel == "." || rel == ".." || strings.HasPrefix(rel, ".."+string(filepath.Separator)) {
2730 return ""
2731 }
2732 if _, err := os.Stat(path); err != nil {
2733 return ""
2734 }
2735 return sess.ID
2736}
2737
2738func resumeSessionHint(id string) string {
2739 return fmt.Sprintf("Session ID: %s\nResume with: zut --resume %s\n\n", id, id)
2740}
2741
2742func agentSessionsRoot(root string, args Args) string {
2743 if args.AgentName == "" {
2744 return root
2745 }
2746 return filepath.Join(root, "sessions", "agents", safeAgentName(args.AgentName))
2747}
2748
2749// openOrCreateSession returns a session for the run. sess may be nil
2750// with a nil error if session persistence is disabled.
2751func openOrCreateSession(ctx context.Context, args Args, r Resolved, ag *core.Agent, version string) (*core.Session, error) {
2752 if args.NoSess {
2753 // Allocate the one logical identity for this non-persisted run during
2754 // runtime assembly instead of allowing a provider adapter to invent it.
2755 ag.SessionID()
2756 return nil, nil
2757 }
2758 // Sweep meta-only files left over from older zut versions (and from
2759 // any session that crashed before its first AppendMessage) for the
2760 // cwd-scoped picker paths. Explicit UUID lookup stays strict so it
2761 // can report metadata failures instead of turning them into misses.
2762 sessionsRoot := agentSessionsRoot(ZutHome(), args)
2763 if args.ResumeSessionID == "" {
2764 core.PruneEmptySessions(sessionsRoot, args.CWD)
2765 }
2766 var (
2767 s *core.Session
2768 msgs []provider.Message
2769 err error
2770 )
2771 switch {
2772 case args.Session != "":
2773 s, msgs, err = core.OpenSession(args.Session)
2774 // An explicit session path may be created on first use; session pickers
2775 // and resume paths still select existing files only.
2776 if err != nil && errors.Is(err, os.ErrNotExist) {
2777 s, err = core.NewSessionAtPath(args.Session, args.CWD, r.Provider, r.Model, version)
2778 msgs = nil
2779 }
2780 case args.Continue:
2781 latest := core.LatestSession(sessionsRoot, args.CWD)
2782 if latest != "" {
2783 s, msgs, err = core.OpenSession(latest)
2784 }
2785 case args.Resume:
2786 if args.ResumeSessionID != "" {
2787 picked, lookupErr := core.FindManagedSessionByID(ctx, ZutHome(), args.ResumeSessionID)
2788 if lookupErr != nil {
2789 return nil, lookupErr
2790 }
2791 if picked == "" {
2792 return nil, fmt.Errorf("session %q not found", args.ResumeSessionID)
2793 }
2794 s, msgs, err = core.OpenSession(picked)
2795 break
2796 }
2797 picked, perr := pickSession(sessionsRoot, args.CWD)
2798 if perr != nil {
2799 return nil, perr
2800 }
2801 if picked != "" {
2802 s, msgs, err = core.OpenSession(picked)
2803 }
2804 }
2805 if err != nil {
2806 return nil, err
2807 }
2808 if s != nil {
2809 if err := ag.BindSessionID(s.Meta.ID); err != nil {
2810 return nil, err
2811 }
2812 ag.SetSessionTimeContext(s.Meta.Started, s.Meta.Timezone, s.Meta.TimezoneOffset)
2813 ag.SetMessages(msgs)
2814 if cum, last, uerr := core.SessionUsageDetail(s.Path); uerr == nil {
2815 ag.SeedCost(cum)
2816 ag.SeedLastTurnUsage(last)
2817 }
2818 return s, nil
2819 }
2820 s, err = core.NewSession(sessionsRoot, args.CWD, r.Provider, r.Model, version)
2821 if err == nil {
2822 if bindErr := ag.BindSessionID(s.Meta.ID); bindErr != nil {
2823 return nil, bindErr
2824 }
2825 ag.SetSessionTimeContext(s.Meta.Started, s.Meta.Timezone, s.Meta.TimezoneOffset)
2826 }
2827 return s, err
2828}
2829
2830func pickSession(root, cwd string) (string, error) {
2831 files := core.ListSessions(root, cwd)
2832 if len(files) == 0 {
2833 fmt.Fprintln(os.Stderr, "no sessions for", cwd)
2834 return "", nil
2835 }
2836 for i, f := range files {
2837 fmt.Fprintf(os.Stderr, " %2d) %s\n", i+1, f)
2838 }
2839 fmt.Fprint(os.Stderr, "pick #: ")
2840 rd := bufio.NewReader(os.Stdin)
2841 line, _ := rd.ReadString('\n')
2842 line = strings.TrimSpace(line)
2843 var n int
2844 if _, err := fmt.Sscanf(line, "%d", &n); err != nil || n < 1 || n > len(files) {
2845 return "", fmt.Errorf("invalid selection")
2846 }
2847 return files[n-1], nil
2848}
2849
2850// WriteNewTranscript appends only messages after index `from` from the
2851// agent's transcript to the session. Used by callers that don't hold
2852// the persistMu (non-interactive print/json modes which run a single
2853// turn under their own goroutine).
2854func WriteNewTranscript(ag *core.Agent, sess *core.Session, from int) error {
2855 _, err := writeNewTranscriptLocked(ag, sess, from)
2856 return err
2857}
2858
2859func wireRetryLifecyclePersistence(ag *core.Agent, sess *core.Session) {
2860 if ag == nil {
2861 return
2862 }
2863 if sess == nil {
2864 ag.OnRetryLifecycle = nil
2865 return
2866 }
2867 ag.OnRetryLifecycle = sess.RecordRetryLifecycle
2868}
2869
2870// writeNewTranscriptLocked is the same as WriteNewTranscript. The
2871// suffix marks that interactive callers must hold persistMu when
2872// invoking it so concurrent appends from the agent loop don't race
2873// with this catch-up flush.
2874func writeNewTranscriptLocked(ag *core.Agent, sess *core.Session, from int) (next int, err error) {
2875 next = from
2876 if sess == nil || ag == nil {
2877 return next, nil
2878 }
2879 msgs, total := ag.MessagesFrom(from)
2880 for offset, msg := range msgs {
2881 index := from + offset
2882 if err := sess.AppendMessage(msg); err != nil {
2883 return next, fmt.Errorf("append transcript message %d: %w", index, err)
2884 }
2885 next = index + 1
2886 }
2887 if len(msgs) == 0 {
2888 next = total
2889 }
2890 cum := ag.Cost()
2891 if err := sess.AppendUsage(cum, cum); err != nil {
2892 return next, fmt.Errorf("append transcript usage: %w", err)
2893 }
2894 if err := sess.Flush(); err != nil {
2895 return next, fmt.Errorf("flush transcript: %w", err)
2896 }
2897 return next, nil
2898}
2899
2900func argsForStdin(rawArgs []string, mode os.FileMode) []string {
2901 if mode&os.ModeCharDevice != 0 {
2902 return rawArgs
2903 }
2904 return append([]string{"--print"}, rawArgs...)
2905}
2906
2907func combinePromptInput(stdin, positional string) string {
2908 parts := make([]string, 0, 2)
2909 if stdin = strings.TrimSpace(stdin); stdin != "" {
2910 parts = append(parts, stdin)
2911 }
2912 if positional = strings.TrimSpace(positional); positional != "" {
2913 parts = append(parts, positional)
2914 }
2915 return strings.Join(parts, "\n")
2916}
2917
2918func readAllStdin() (string, error) {
2919 fi, err := os.Stdin.Stat()
2920 if err != nil {
2921 return "", err
2922 }
2923 if (fi.Mode() & os.ModeCharDevice) != 0 {
2924 return "", nil
2925 }
2926 return readAllStdinFrom(os.Stdin)
2927}
2928
2929func readAllStdinFrom(r io.Reader) (string, error) {
2930 b, err := io.ReadAll(r)
2931 return string(b), err
2932}
2933
2934func printModels() {
2935 models := provider.Active()
2936
2937 // Compute column widths from actual data so wide providers (e.g.
2938 // xiaomi-token-plan-sgp) and long bedrock model ids don't force the
2939 // `name` column off-screen. Floors mirror the historical layout so
2940 // short catalogs look the same as before.
2941 provW, idW, srcW := len("provider"), len("model id"), len("source")
2942 for _, m := range models {
2943 if w := len(m.Provider); w > provW {
2944 provW = w
2945 }
2946 if w := len(m.ID); w > idW {
2947 idW = w
2948 }
2949 source := m.Source
2950 if source == "" {
2951 source = "catalog"
2952 }
2953 if m.Speculative {
2954 source = "speculative"
2955 }
2956 if w := len(source); w > srcW {
2957 srcW = w
2958 }
2959 }
2960
2961 header := fmt.Sprintf("%-*s %-*s %8s %8s %s %-*s %s",
2962 provW, "provider",
2963 idW, "model id",
2964 "context", "max-out", "reasoning",
2965 srcW, "source",
2966 "name")
2967 fmt.Println(header)
2968
2969 for _, m := range models {
2970 reason := " "
2971 if m.Reasoning {
2972 reason = "✓"
2973 }
2974 source := m.Source
2975 if source == "" {
2976 source = "catalog"
2977 }
2978 if m.Speculative {
2979 source = "speculative"
2980 }
2981 fmt.Printf("%-*s %-*s %8d %8d %s %-*s %s\n",
2982 provW, m.Provider,
2983 idW, m.ID,
2984 m.ContextWindow, m.MaxOutput,
2985 reason,
2986 srcW, source,
2987 m.DisplayName)
2988 }
2989}