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/scheduler"
23 "github.com/bnema/zut/packages/agent/skills"
24 "github.com/bnema/zut/packages/agent/subagents"
25 "github.com/bnema/zut/packages/agent/tools"
26 "github.com/bnema/zut/packages/core"
27 "github.com/bnema/zut/packages/provider"
28 "github.com/bnema/zut/packages/provider/auth"
29 "github.com/bnema/zut/packages/tui"
30)
31
32// interactiveExtHooks is a tiny adapter that lets the extension
33// manager call back into the Interactive instance built later in
34// runInteractive. Alerts are buffered until the instance is attached so
35// an extension that signals attention during startup is not silently lost.
36// Keep the startup buffer bounded because extensions can flood their host.
37const maxBufferedInteractiveAlerts = 64
38
39type interactiveExtHooks struct {
40 mu sync.Mutex
41 interactive *modes.Interactive
42 pendingAlerts []interactiveAlert
43 pendingStatuses map[string]interactiveStatus
44 pendingWidgets map[string]interactiveWidget
45}
46
47type interactiveAlert struct {
48 extName string
49 alert extproto.AlertRequest
50}
51
52type interactiveStatus struct {
53 extName string
54 key string
55 level string
56 text string
57}
58
59type interactiveWidget struct {
60 extName string
61 id string
62 position string
63 title string
64 lines []string
65}
66
67func (h *interactiveExtHooks) iv() *modes.Interactive {
68 if h == nil {
69 return nil
70 }
71 h.mu.Lock()
72 defer h.mu.Unlock()
73 return h.interactive
74}
75
76func (h *interactiveExtHooks) attachInteractive(iv *modes.Interactive) {
77 if h == nil || iv == nil {
78 return
79 }
80 h.mu.Lock()
81 h.interactive = iv
82 pendingAlerts := h.pendingAlerts
83 pendingStatuses := h.pendingStatuses
84 pendingWidgets := h.pendingWidgets
85 h.pendingAlerts = nil
86 h.pendingStatuses = nil
87 h.pendingWidgets = nil
88 h.mu.Unlock()
89 for _, item := range pendingAlerts {
90 iv.Alert(item.extName, item.alert)
91 }
92 for _, item := range pendingStatuses {
93 iv.SetStatus(item.extName, item.key, item.level, item.text)
94 }
95 for _, item := range pendingWidgets {
96 iv.SetWidget(item.extName, item.id, item.position, item.title, item.lines)
97 }
98}
99
100func (h *interactiveExtHooks) Notify(extName, level, message string) {
101 if iv := h.iv(); iv != nil {
102 iv.Notify(extName, level, message)
103 }
104}
105func (h *interactiveExtHooks) Alert(extName string, alert extproto.AlertRequest) {
106 if h == nil {
107 return
108 }
109 h.mu.Lock()
110 if h.interactive == nil {
111 if len(h.pendingAlerts) < maxBufferedInteractiveAlerts {
112 h.pendingAlerts = append(h.pendingAlerts, interactiveAlert{extName: extName, alert: alert})
113 }
114 h.mu.Unlock()
115 return
116 }
117 iv := h.interactive
118 h.mu.Unlock()
119 iv.Alert(extName, alert)
120}
121func (h *interactiveExtHooks) Submit(text string) {
122 if iv := h.iv(); iv != nil {
123 iv.SubmitOrQueue(text, nil)
124 }
125}
126func (h *interactiveExtHooks) SubmitSlash(text string) {
127 if iv := h.iv(); iv != nil {
128 iv.SubmitSlash(text)
129 }
130}
131func (h *interactiveExtHooks) Insert(text string) {
132 if iv := h.iv(); iv != nil {
133 iv.Insert(text)
134 }
135}
136func (h *interactiveExtHooks) Display(extName, text string) {
137 if iv := h.iv(); iv != nil {
138 iv.Display(extName, text)
139 }
140}
141func (h *interactiveExtHooks) ClearNotes(extName string) {
142 if iv := h.iv(); iv != nil {
143 iv.ClearNotes(extName)
144 }
145}
146func (h *interactiveExtHooks) OpenPanel(extName string, spec extproto.PanelSpec) {
147 if iv := h.iv(); iv != nil {
148 iv.OpenPanel(extName, spec)
149 }
150}
151func (h *interactiveExtHooks) UpdatePanel(extName, panelID, title string, lines []string, footer string) {
152 if iv := h.iv(); iv != nil {
153 iv.UpdatePanel(extName, panelID, title, lines, footer)
154 }
155}
156func (h *interactiveExtHooks) ClosePanel(extName, panelID string) {
157 if iv := h.iv(); iv != nil {
158 iv.ClosePanel(extName, panelID)
159 }
160}
161func pendingChromeKey(extName, key string) string { return extName + "\x00" + key }
162
163func (h *interactiveExtHooks) SetStatus(extName, key, level, text string) {
164 if h == nil {
165 return
166 }
167 h.mu.Lock()
168 if h.interactive == nil {
169 if h.pendingStatuses == nil {
170 h.pendingStatuses = map[string]interactiveStatus{}
171 }
172 pendingKey := pendingChromeKey(extName, key)
173 if strings.TrimSpace(text) == "" {
174 delete(h.pendingStatuses, pendingKey)
175 } else {
176 h.pendingStatuses[pendingKey] = interactiveStatus{extName: extName, key: key, level: level, text: text}
177 }
178 h.mu.Unlock()
179 return
180 }
181 iv := h.interactive
182 h.mu.Unlock()
183 iv.SetStatus(extName, key, level, text)
184}
185func (h *interactiveExtHooks) SetWidget(extName, id, position, title string, lines []string) {
186 if h == nil {
187 return
188 }
189 h.mu.Lock()
190 if h.interactive == nil {
191 if h.pendingWidgets == nil {
192 h.pendingWidgets = map[string]interactiveWidget{}
193 }
194 h.pendingWidgets[pendingChromeKey(extName, id)] = interactiveWidget{
195 extName: extName, id: id, position: position, title: title, lines: append([]string(nil), lines...),
196 }
197 h.mu.Unlock()
198 return
199 }
200 iv := h.interactive
201 h.mu.Unlock()
202 iv.SetWidget(extName, id, position, title, lines)
203}
204func (h *interactiveExtHooks) ClearWidget(extName, id string) {
205 if h == nil {
206 return
207 }
208 h.mu.Lock()
209 if h.interactive == nil {
210 if h.pendingWidgets != nil {
211 delete(h.pendingWidgets, pendingChromeKey(extName, id))
212 }
213 h.mu.Unlock()
214 return
215 }
216 iv := h.interactive
217 h.mu.Unlock()
218 iv.ClearWidget(extName, id)
219}
220
221func (h *interactiveExtHooks) ClearExtensionChrome(extName string) {
222 if h == nil {
223 return
224 }
225 h.mu.Lock()
226 if h.interactive == nil {
227 prefix := extName + "\x00"
228 for key := range h.pendingStatuses {
229 if strings.HasPrefix(key, prefix) {
230 delete(h.pendingStatuses, key)
231 }
232 }
233 for key := range h.pendingWidgets {
234 if strings.HasPrefix(key, prefix) {
235 delete(h.pendingWidgets, key)
236 }
237 }
238 h.mu.Unlock()
239 return
240 }
241 iv := h.interactive
242 h.mu.Unlock()
243 iv.ClearExtensionChrome(extName)
244}
245
246// extToolAdapter bridges *extensions.Manager to the
247// ExtensionToolSource interface declared in build.go (kept narrow to
248// avoid a build->extensions import cycle). One adapter instance per
249// run; used at every Resolve point so re-built agents pick up the
250// same set of extension tools.
251type extToolAdapter struct {
252 mgr *extensions.Manager
253}
254
255var _ ExtensionToolSource = (*extToolAdapter)(nil)
256var _ ExtensionSkillSource = (*extToolAdapter)(nil)
257
258func (a *extToolAdapter) Skills() []*skills.Skill {
259 if a == nil || a.mgr == nil {
260 return nil
261 }
262 return a.mgr.Skills()
263}
264
265func (a *extToolAdapter) Tools() []ExtensionToolInfo {
266 infos := a.mgr.Tools()
267 out := make([]ExtensionToolInfo, len(infos))
268 for i, t := range infos {
269 out[i] = ExtensionToolInfo{
270 Extension: t.Extension,
271 Name: t.Name,
272 Description: t.Description,
273 Schema: t.Schema,
274 Deferred: t.Deferred,
275 }
276 }
277 return out
278}
279
280func (a *extToolAdapter) NewExtensionTool(info ExtensionToolInfo) core.Tool {
281 return extensions.NewTool(a.mgr, extensions.ToolInfo{
282 Extension: info.Extension,
283 Name: info.Name,
284 Description: info.Description,
285 Schema: info.Schema,
286 Deferred: info.Deferred,
287 })
288}
289
290// liveInteractiveAgent returns the agent currently owned by the TUI. The
291// fallback is only used before the Interactive has been constructed.
292//
293// Agent rebuilds, such as cross-provider model switches, replace the TUI's
294// agent without replacing the startup pointer held by runInteractive. Session
295// operations must therefore resolve the live agent at the time of the action.
296func liveInteractiveAgent(iv *modes.Interactive, fallback *core.Agent) *core.Agent {
297 if iv != nil {
298 return iv.Agent()
299 }
300 return fallback
301}
302
303func newSessionTransition(mu *sync.RWMutex) func(func()) {
304 return func(fn func()) {
305 mu.Lock()
306 defer mu.Unlock()
307 fn()
308 }
309}
310
311// newPersistModelCallback returns the callback used by the TUI while its
312// session transition write lock is held. It must not acquire that lock again
313// because sync.RWMutex is not reentrant.
314func newPersistModelCallback(persistMu *sync.Mutex, sess **core.Session, activeProvider, activeModel *string, notify func(string)) func(string, string) {
315 return func(providerName, model string) {
316 providerName = strings.TrimSpace(providerName)
317 model = strings.TrimSpace(model)
318
319 persistMu.Lock()
320 var sessionErr error
321 if *sess != nil {
322 sessionErr = (*sess).UpdateModel(providerName, model)
323 }
324 *activeProvider = providerName
325 *activeModel = model
326 persistMu.Unlock()
327 if sessionErr != nil {
328 if notify != nil {
329 notify("model change was not persisted: " + sessionErr.Error())
330 }
331 return
332 }
333
334 cfg, err := LoadConfig()
335 if err != nil {
336 if notify != nil {
337 notify("model changed for this run, but config could not be read: " + err.Error())
338 }
339 return
340 }
341 cfg.Provider = providerName
342 cfg.Model = model
343 if err := SaveConfig(cfg); err != nil && notify != nil {
344 notify("model changed for this run, but config could not be saved: " + err.Error())
345 }
346 }
347}
348
349func closeAgentLSP(ag *core.Agent) {
350 if ag != nil {
351 _ = tools.CloseLSPManagers(ag.ToolsSnapshot())
352 }
353}
354
355func joinSessionCloseError(err error, sess *core.Session) error {
356 if sess == nil {
357 return err
358 }
359 if closeErr := sess.Close(); closeErr != nil {
360 return errors.Join(err, fmt.Errorf("close session: %w", closeErr))
361 }
362 return err
363}
364
365func closeResolvedLSP(r Resolved) {
366 _ = tools.CloseLSPManagers(r.ToolRegistry)
367}
368
369func trimMessagesForResume(msgs []provider.Message, keepTail int) []provider.Message {
370 if keepTail <= 0 || len(msgs) <= keepTail {
371 return provider.RepairOrphanedToolResults(msgs)
372 }
373 var out []provider.Message
374 start := len(msgs) - keepTail
375 var carriedToolNames []string
376 addToolNames := func(names []string) {
377 for _, name := range names {
378 if name == "" || slices.Contains(carriedToolNames, name) {
379 continue
380 }
381 carriedToolNames = append(carriedToolNames, name)
382 }
383 }
384 // Activation markers in the discarded prefix still affect the retained
385 // provider request. Carry them onto its first message rather than dropping
386 // deferred-tool availability when the resume tail is shortened.
387 for _, msg := range msgs[:start] {
388 addToolNames(msg.AddedToolNames)
389 }
390 // Preserve the synthetic compaction summary when present so an
391 // already-compacted session stays compacted after resume. Count it
392 // within the tail budget instead of dropping it at the exact boundary.
393 if len(msgs) > 0 && msgs[0].Meta["compaction"] == "true" && start > 0 {
394 out = append(out, msgs[0])
395 start++
396 }
397 // Avoid hydrating a tail that starts with orphan tool_result rows;
398 // provider APIs require those to be paired with an earlier tool_use.
399 for start < len(msgs) && msgs[start].Role == provider.RoleTool {
400 start++
401 }
402 out = append(out, msgs[start:]...)
403 if len(carriedToolNames) > 0 && len(out) > 0 {
404 first := out[0]
405 for _, name := range first.AddedToolNames {
406 addToolNames([]string{name})
407 }
408 first.AddedToolNames = append([]string(nil), carriedToolNames...)
409 out[0] = first
410 }
411 return provider.RepairOrphanedToolResults(out)
412}
413
414// sessionResumeCandidate contains all state needed to resume a session.
415// It is deliberately assembled before the caller changes any live state:
416// opening the transcript, reading usage, and rebuilding a provider/model
417// must all succeed before the candidate can replace the current session.
418type sessionResumeCandidate struct {
419 session *core.Session
420 agent *core.Agent
421 messages []provider.Message
422 fullMessageCount int
423 cumulative provider.Usage
424 lastTurn provider.Usage
425 provider string
426 model string
427 rebuilt bool
428 // planSnapshots is the per-call checklist reconstruction over the full
429 // on-disk transcript. The resumed agent only keeps the trimmed tail, so
430 // the interactive must seed from this rather than replay its messages.
431 planSnapshots map[string]core.PlanUpdate
432}
433
434// prepareSessionResume opens and validates a selected session without
435// touching the current agent. Missing provider/model metadata is treated as
436// legacy metadata: the current agent is reused, preserving compatibility
437// with sessions written before those fields were persisted.
438//
439// The returned candidate owns session until its caller commits it. On any
440// error this function closes the candidate session and leaves the current
441// agent untouched.
442func prepareSessionResume(path string, current *core.Agent, currentProvider, currentModel string, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (sessionResumeCandidate, error) {
443 return prepareSessionResumeWithOptions(path, current, currentProvider, currentModel, false, false, false, buildAgentFor)
444}
445
446// prepareSessionResumeForWorkspace always rebuilds the agent. A selected
447// transcript from another cwd must not retain tools, instructions, or sandbox
448// state assembled for the previous workspace even when provider/model match.
449func prepareSessionResumeForWorkspace(path string, current *core.Agent, currentProvider, currentModel string, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (sessionResumeCandidate, error) {
450 return prepareSessionResumeWithOptions(path, current, currentProvider, currentModel, false, false, true, buildAgentFor)
451}
452
453// prepareSessionResumeWithOptions is the provider/model-aware implementation.
454// An explicit CLI provider or model keeps that field authoritative; an empty
455// field falls back to the selected session's metadata when it is complete.
456func prepareSessionResumeWithOptions(path string, current *core.Agent, currentProvider, currentModel string, explicitProvider, explicitModel, forceRebuild bool, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (candidate sessionResumeCandidate, err error) {
457 if current == nil {
458 return candidate, fmt.Errorf("no agent running; log in first")
459 }
460
461 sess, msgs, err := core.OpenSession(path)
462 if err != nil {
463 return candidate, err
464 }
465 keepSession := false
466 defer func() {
467 if !keepSession {
468 err = joinSessionCloseError(err, sess)
469 }
470 }()
471
472 cumulative, lastTurn, err := core.SessionUsageDetail(path)
473 if err != nil {
474 return candidate, fmt.Errorf("read session usage: %w", err)
475 }
476
477 fullMessageCount := len(msgs)
478 resumedMessages := trimMessagesForResume(msgs, 100)
479 // Reconstruct the historical checklists from the untrimmed messages: a
480 // plan delta inside the trim window needs the pre-window base to rebuild
481 // the right list, and the view must keep using the trimmed transcript.
482 planSnapshots := core.PlanUpdateSnapshots(msgs)
483 storedProvider := strings.TrimSpace(sess.Meta.Provider)
484 storedModel := strings.TrimSpace(sess.Meta.Model)
485 currentProvider = strings.TrimSpace(currentProvider)
486 currentModel = strings.TrimSpace(currentModel)
487
488 candidate = sessionResumeCandidate{
489 session: sess,
490 agent: current,
491 messages: resumedMessages,
492 fullMessageCount: fullMessageCount,
493 cumulative: cumulative,
494 lastTurn: lastTurn,
495 provider: currentProvider,
496 model: currentModel,
497 planSnapshots: planSnapshots,
498 }
499
500 // Old sessions may have either field absent. Only a complete stored
501 // selection is actionable; otherwise resume exactly as older zut did.
502 if storedProvider == "" || storedModel == "" {
503 keepSession = true
504 return candidate, nil
505 }
506
507 resumeProvider := storedProvider
508 if explicitProvider {
509 resumeProvider = currentProvider
510 }
511 resumeModel := storedModel
512 if explicitModel {
513 resumeModel = currentModel
514 }
515 if !forceRebuild && resumeProvider == currentProvider && resumeModel == currentModel {
516 keepSession = true
517 return candidate, nil
518 }
519 if buildAgentFor == nil {
520 return sessionResumeCandidate{}, fmt.Errorf("cannot resume session with provider %q and model %q: no agent builder configured", resumeProvider, resumeModel)
521 }
522
523 rebuilt, resolvedProvider, resolvedModel, err := buildAgentFor(resumeProvider, resumeModel)
524 if err != nil {
525 return sessionResumeCandidate{}, fmt.Errorf("rebuild agent for session provider %q/model %q: %w", resumeProvider, resumeModel, err)
526 }
527 if rebuilt == nil {
528 return sessionResumeCandidate{}, fmt.Errorf("rebuild agent for session provider %q/model %q returned no agent", resumeProvider, resumeModel)
529 }
530 resolvedProvider = strings.TrimSpace(resolvedProvider)
531 resolvedModel = strings.TrimSpace(resolvedModel)
532 if resolvedProvider == "" {
533 resolvedProvider = storedProvider
534 }
535 if resolvedModel == "" {
536 resolvedModel = storedModel
537 }
538
539 // Hydrate and seed the replacement while it is still private. The live
540 // agent is not modified until the caller commits the complete candidate.
541 rebuilt.SetMessages(resumedMessages)
542 rebuilt.SeedCost(cumulative)
543 rebuilt.SeedLastTurnUsage(lastTurn)
544 candidate.agent = rebuilt
545 candidate.provider = resolvedProvider
546 candidate.model = resolvedModel
547 candidate.rebuilt = true
548 keepSession = true
549 return candidate, nil
550}
551
552func 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) {
553 next := args
554 next.Provider = providerName
555 next.Model = model
556 resolved, err := Resolve(next, true)
557 if err != nil {
558 return nil, "", "", err
559 }
560 resolved.UseSandbox(base.Sandbox)
561 if extMgr != nil {
562 resolved.MergeExtensionTools(&extToolAdapter{mgr: extMgr})
563 }
564 if prepareRegistry != nil {
565 prepareRegistry(resolved.ToolRegistry)
566 }
567 ag := resolved.NewAgent()
568 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
569 return ag, resolved.Provider, resolved.Model, nil
570}
571
572// applySessionResume shares the startup gate, candidate hydration, and
573// commit order used by interactive and non-interactive session opening. The
574// old append handle is closed only after the candidate has been prepared and
575// seeded successfully.
576func applySessionResume(sess *core.Session, ag *core.Agent, currentProvider, currentModel string, explicitProvider, explicitModel bool, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (sessionResumeCandidate, error) {
577 candidate := sessionResumeCandidate{
578 session: sess,
579 agent: ag,
580 fullMessageCount: 0,
581 provider: currentProvider,
582 model: currentModel,
583 }
584 if ag != nil {
585 candidate.fullMessageCount = len(ag.Messages())
586 }
587 if sess == nil || ag == nil {
588 return candidate, nil
589 }
590 ag.SetSessionTimeContext(sess.Meta.Started, sess.Meta.Timezone, sess.Meta.TimezoneOffset)
591 // A newly created meta-only session is already on the active pair. Avoid
592 // reopening and closing it through the resume path: Close intentionally
593 // removes fresh empty sessions, and a second append handle would otherwise
594 // keep an unlinked file alive.
595 if len(ag.Messages()) == 0 &&
596 strings.TrimSpace(sess.Meta.Provider) == strings.TrimSpace(currentProvider) &&
597 strings.TrimSpace(sess.Meta.Model) == strings.TrimSpace(currentModel) {
598 ag.SetPlan(sess.Meta.PlanSteps())
599 return candidate, nil
600 }
601 candidate, err := prepareSessionResumeWithOptions(sess.Path, ag, currentProvider, currentModel, explicitProvider, explicitModel, false, buildAgentFor)
602 if err != nil {
603 return sessionResumeCandidate{}, joinSessionCloseError(err, sess)
604 }
605 // A replacement agent is still private at this point. Bind the durable
606 // identity before it can be published or run any startup work.
607 if err := candidate.agent.BindSessionID(candidate.session.Meta.ID); err != nil {
608 return sessionResumeCandidate{}, joinSessionCloseError(err, candidate.session)
609 }
610 if !candidate.rebuilt {
611 candidate.agent.SetMessages(candidate.messages)
612 candidate.agent.SeedCost(candidate.cumulative)
613 candidate.agent.SeedLastTurnUsage(candidate.lastTurn)
614 }
615 if closeErr := sess.Close(); closeErr != nil {
616 return sessionResumeCandidate{}, errors.Join(fmt.Errorf("close session: %w", closeErr), joinSessionCloseError(nil, candidate.session))
617 }
618 candidate.agent.SetSessionTimeContext(candidate.session.Meta.Started, candidate.session.Meta.Timezone, candidate.session.Meta.TimezoneOffset)
619 // Seed the agent-owned plan from the loaded session so a resumed session's
620 // core state matches its file: the transcript holds steps while core would
621 // otherwise hold none, which makes show answer "Plan is empty" and indexed
622 // update/remove fail. Done after the candidate is fully hydrated but before
623 // the caller commits it.
624 candidate.agent.SetPlan(candidate.session.Meta.PlanSteps())
625 return candidate, nil
626}
627
628// applyInitialSessionResume applies the same provider/model-aware candidate
629// contract used by interactive session switching to non-interactive startup
630// modes. The returned session owns the replacement append handle.
631func applyInitialSessionResume(ctx context.Context, args Args, base Resolved, extMgr *extensions.Manager, sess *core.Session, ag *core.Agent) (*core.Session, *core.Agent, string, string, error) {
632 return applyInitialSessionResumeWithRegistry(ctx, args, base, extMgr, sess, ag, nil)
633}
634
635func 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) {
636 candidate, err := applySessionResume(sess, ag, base.Provider, base.Model,
637 strings.TrimSpace(args.Provider) != "", strings.TrimSpace(args.Model) != "", func(providerName, model string) (*core.Agent, string, string, error) {
638 return buildNonInteractiveSessionAgentWithRegistry(ctx, args, base, extMgr, providerName, model, prepareRegistry)
639 })
640 if err != nil {
641 return nil, ag, "", "", err
642 }
643 return candidate.session, candidate.agent, candidate.provider, candidate.model, nil
644}
645
646func 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) {
647 candidate, err := applySessionResume(sess, ag, base.Provider, base.Model,
648 strings.TrimSpace(args.Provider) != "", strings.TrimSpace(args.Model) != "", func(providerName, model string) (*core.Agent, string, string, error) {
649 next := args
650 next.Provider = providerName
651 next.Model = model
652 resolved, resolveErr := Resolve(next, true)
653 if resolveErr != nil {
654 return nil, "", "", resolveErr
655 }
656 resolved.UseSandbox(base.Sandbox)
657 if extMgr != nil {
658 resolved.MergeExtensionTools(&extToolAdapter{mgr: extMgr})
659 }
660 if runtime != nil {
661 runtime.SetProvider(resolved.Provider)
662 runtime.SetModel(resolved.Model)
663 runtime.SetContextWindow(resolved.ContextWindow)
664 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
665 runtime.SetFastMode(resolved.FastMode)
666 runtime.PrepareResolvedRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
667 }
668 rebuilt := resolved.NewAgent()
669 wireNonInteractiveAgentExtHooks(ctx, rebuilt, extMgr)
670 return rebuilt, resolved.Provider, resolved.Model, nil
671 })
672 if err != nil {
673 return nil, ag, "", "", err
674 }
675 return candidate.session, candidate.agent, candidate.provider, candidate.model, nil
676}
677
678// fanoutAgentEvent translates a core.AgentEvent into the wire-format
679// EventFromHost and pushes it through the extension manager. Only
680// the events that have a clear extension-facing meaning are
681// forwarded; internal-only ones (text_delta, tool_progress) are
682// dropped to keep the per-extension stream sane.
683func sessionContext(sess *core.Session) *extproto.SessionContext {
684 if sess == nil {
685 return nil
686 }
687 return &extproto.SessionContext{
688 ID: sess.Meta.ID,
689 ParentID: sess.Meta.Parent,
690 Path: sess.Path,
691 CWD: sess.Meta.CWD,
692 ForkPoint: sess.Meta.ForkPoint,
693 }
694}
695
696func announceSession(mgr *extensions.Manager, sess *core.Session) {
697 if mgr == nil {
698 return
699 }
700 var states map[string]json.RawMessage
701 if sess != nil {
702 states = copyExtensionStates(sess.ExtensionState)
703 }
704 mgr.EmitSessionEvent("session_start", sessionContext(sess), states)
705 if sess != nil {
706 mgr.EmitSessionEvent("session_opened", sessionContext(sess), states)
707 }
708}
709
710func copyExtensionStates(states map[string]json.RawMessage) map[string]json.RawMessage {
711 if len(states) == 0 {
712 return nil
713 }
714 out := make(map[string]json.RawMessage, len(states))
715 for name, state := range states {
716 out[name] = append(json.RawMessage(nil), state...)
717 }
718 return out
719}
720
721var (
722 errGoalActiveReplacement = errors.New("active goal replacement")
723 errGoalMissionMismatch = errors.New("goal mission mismatch")
724 errGoalStaleUpdate = errors.New("stale goal update")
725 errGoalStorageUnavailable = errors.New("goal storage unavailable")
726 errGoalStateWrite = errors.New("goal state write")
727
728 errPlanStorageUnavailable = errors.New("plan storage unavailable")
729 errPlanStateWrite = errors.New("plan state write")
730)
731
732func persistToolResultState(mgr *extensions.Manager, sess *core.Session, result core.ToolResult, goalMaxTokenBudget ...*uint64) error {
733 if sess == nil {
734 if _, ok := tools.GoalUpdateFromResult(result); ok {
735 return goalCommitError(errGoalStorageUnavailable)
736 }
737 if result.PlanOperation != nil && !result.IsError {
738 return planCommitError(errPlanStorageUnavailable)
739 }
740 return nil
741 }
742 if details, ok := result.Details.(extensions.ToolResultDetails); ok && details.Extension != "" && len(details.State) > 0 {
743 if err := sess.AppendExtensionState(details.Extension, details.State); err != nil {
744 return fmt.Errorf("extension state: %w", err)
745 }
746 if mgr != nil {
747 mgr.UpdateSessionState(details.Extension, details.State)
748 }
749 }
750 if err := persistGoalToolResult(sess, result, goalMaxTokenBudget...); err != nil {
751 return goalCommitError(err)
752 }
753 if err := persistPlanToolResult(sess, result); err != nil {
754 return planCommitError(err)
755 }
756 return nil
757}
758
759func goalCommitError(err error) error {
760 return &core.ToolResultCommitError{Message: safeGoalCommitMessage(err), Err: fmt.Errorf("goal state: %w", err)}
761}
762
763func safeGoalCommitMessage(err error) string {
764 switch {
765 case errors.Is(err, errGoalActiveReplacement):
766 return "goal transition rejected: the current goal is still active"
767 case errors.Is(err, errGoalMissionMismatch):
768 return "goal transition rejected: it does not belong to the active mission"
769 case errors.Is(err, errGoalStaleUpdate):
770 return "goal transition rejected: the active goal changed"
771 case errors.Is(err, errGoalStorageUnavailable):
772 return "goal state unavailable: session persistence is disabled"
773 case errors.Is(err, errGoalStateWrite):
774 return "goal state could not be saved"
775 default:
776 return "goal update could not be persisted"
777 }
778}
779
780func planCommitError(err error) error {
781 return &core.ToolResultCommitError{Message: safePlanCommitMessage(err), Err: fmt.Errorf("plan state: %w", err)}
782}
783
784func safePlanCommitMessage(err error) string {
785 switch {
786 case errors.Is(err, errPlanStorageUnavailable):
787 return "plan state unavailable: session persistence is disabled"
788 case errors.Is(err, errPlanStateWrite):
789 return "plan state could not be saved"
790 default:
791 return "plan update could not be persisted"
792 }
793}
794
795func persistGoalToolResult(sess *core.Session, result core.ToolResult, goalMaxTokenBudget ...*uint64) error {
796 if sess == nil {
797 return nil
798 }
799 update, ok := tools.GoalUpdateFromResult(result)
800 if !ok {
801 return nil
802 }
803 if update.Status == core.GoalSuperseded {
804 if sess.Meta.Goal == nil || sess.Meta.Goal.Status != core.GoalActive {
805 return nil
806 }
807 if update.GoalID != sess.Meta.Goal.ID {
808 return errGoalStaleUpdate
809 }
810 if sess.Meta.Mission != nil && update.MissionID != "" && update.MissionID != sess.Meta.Mission.ID {
811 return errGoalMissionMismatch
812 }
813 replacement := &core.SessionGoal{Objective: update.Objective, Status: core.GoalActive, Owner: core.GoalOwnerManager}
814 if len(goalMaxTokenBudget) > 0 && goalMaxTokenBudget[0] != nil && *goalMaxTokenBudget[0] > 0 {
815 budget := *goalMaxTokenBudget[0]
816 replacement.TokenBudget = &budget
817 }
818 if err := sess.SupersedeGoal(replacement); err != nil {
819 return fmt.Errorf("%w: %w", errGoalStateWrite, err)
820 }
821 return nil
822 }
823 if update.Status == core.GoalActive {
824 if sess.Meta.Goal != nil && sess.Meta.Goal.Status == core.GoalActive {
825 return errGoalActiveReplacement
826 }
827 if sess.Meta.Mission != nil && update.MissionID != "" && update.MissionID != sess.Meta.Mission.ID {
828 return errGoalMissionMismatch
829 }
830 goal := &core.SessionGoal{Objective: update.Objective, Status: core.GoalActive, Owner: core.GoalOwnerManager}
831 if len(goalMaxTokenBudget) > 0 && goalMaxTokenBudget[0] != nil && *goalMaxTokenBudget[0] > 0 {
832 budget := *goalMaxTokenBudget[0]
833 goal.TokenBudget = &budget
834 }
835 if err := sess.UpdateGoal(goal); err != nil {
836 return fmt.Errorf("%w: %w", errGoalStateWrite, err)
837 }
838 return nil
839 }
840 if sess.Meta.Goal == nil || sess.Meta.Goal.Status != core.GoalActive {
841 return nil
842 }
843 goal := *sess.Meta.Goal
844 goal.Status = update.Status
845 goal.Reason = update.Reason
846 if err := sess.UpdateGoal(&goal); err != nil {
847 return fmt.Errorf("%w: %w", errGoalStateWrite, err)
848 }
849 return nil
850}
851
852// persistPlanToolResult writes the materialized checklist for a validated plan
853// mutation. show carries neither Details nor PlanOperation, and error results
854// were already rejected, so both are skipped here.
855func persistPlanToolResult(sess *core.Session, result core.ToolResult) error {
856 if sess == nil || result.IsError || result.PlanOperation == nil {
857 return nil
858 }
859 update, ok := result.Details.(core.PlanUpdate)
860 if !ok {
861 return nil
862 }
863 if err := sess.UpdatePlan(&core.SessionPlan{Steps: update.Plan}); err != nil {
864 return fmt.Errorf("%w: %w", errPlanStateWrite, err)
865 }
866 return nil
867}
868
869func fanoutAgentEvent(mgr *extensions.Manager, ev core.AgentEvent) {
870 if mgr == nil {
871 return
872 }
873 switch e := ev.(type) {
874 case core.EvTurnStart:
875 mgr.EmitEvent(extproto.EventFromHost{Event: "turn_start", Step: e.Step})
876 case core.EvToolCall:
877 mgr.EmitEvent(extproto.EventFromHost{
878 Event: "tool_call", ToolID: e.ID, ToolName: e.Name, ToolArgs: e.Args,
879 })
880 case core.EvAssistantMessage:
881 // Concat the visible text portions of the message; binary
882 // blocks (tool_use, etc.) are skipped because subscribers
883 // usually want a string they can grep / display.
884 var text string
885 for _, c := range e.Message.Content {
886 if tb, ok := c.(provider.TextBlock); ok {
887 text += tb.Text
888 }
889 }
890 mgr.EmitEvent(extproto.EventFromHost{Event: "assistant_message", Text: text})
891 case core.EvTurnEnd:
892 ev := extproto.EventFromHost{Event: "turn_end", Stop: string(e.Stop)}
893 if e.Err != nil {
894 ev.Error = e.Err.Error()
895 }
896 mgr.EmitEvent(ev)
897 }
898}
899
900// Run is the top-level entrypoint for the zut binary.
901func Run(rawArgs []string, version string) error {
902 // Apply network configuration before any subcommand can make an HTTP
903 // request. Standard proxy environment variables retain precedence.
904 applyConfiguredHTTPProxy()
905
906 // Extension installs can invoke external build and clone processes.
907 // Give those processes a cancellation context without changing signal
908 // handling for the interactive modes below.
909 extCtx := context.Background()
910 stopExtContext := func() {}
911 if len(rawArgs) > 0 && rawArgs[0] == "ext" {
912 extCtx, stopExtContext = signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
913 }
914 defer stopExtContext()
915
916 // Subcommand router: `zut bot ...` is handled separately so the
917 // generic flag parser doesn't reject "bot" as a positional arg.
918 if handled, err := runBotCommand(rawArgs, version); handled {
919 return err
920 }
921 if handled, err := runExtCommand(extCtx, rawArgs, version); handled {
922 return err
923 }
924 if handled, err := runUpdateCommand(rawArgs, version); handled {
925 return err
926 }
927 if handled, err := runSessionsCommand(rawArgs); handled {
928 return err
929 }
930 if handled, err := runZutfileCommand(rawArgs, version); handled {
931 return err
932 }
933 return runWithArgsRaw(rawArgs, version)
934}
935
936func runWithArgsRaw(rawArgs []string, version string) error {
937 // `zut rpc` is shorthand for `zut --rpc` so third-party apps can
938 // spawn the binary with a clean argv. Strip the leading 'rpc'
939 // token and let the rest flow through the normal arg parser.
940 if len(rawArgs) > 0 && rawArgs[0] == "rpc" {
941 rawArgs = append([]string{"--rpc"}, rawArgs[1:]...)
942 }
943
944 if fi, err := os.Stdin.Stat(); err == nil {
945 rawArgs = argsForStdin(rawArgs, fi.Mode())
946 }
947 args, err := ParseArgs(rawArgs)
948 if err != nil {
949 PrintHelp(version)
950 return err
951 }
952 if args.Help {
953 PrintHelp(version)
954 return nil
955 }
956 if args.Version {
957 fmt.Println("zut", version)
958 return nil
959 }
960 // Reject invalid orchestration combinations before catalog repair or model
961 // refresh can mutate local state or launch background work.
962 if err := validateOrchestrationArgs(args); err != nil {
963 return err
964 }
965 // Model catalog: load any cached discovery data before we inspect
966 // the model list (list-models, print/json, interactive).
967 userModels := LoadUserModels()
968 PrepareRuntimeCatalog(context.Background(), args.ListModels, args.Provider, args.APIKey, args.BaseURL, userModels, args.Model)
969
970 if args.ListModels {
971 printModels()
972 return nil
973 }
974
975 return runWithArgs(args, version)
976}
977
978func runWithArgs(args Args, version string) error {
979 if err := validateOrchestrationArgs(args); err != nil {
980 return err
981 }
982 ctx := context.Background()
983 switch args.Mode {
984 case ModePrint:
985 return runPrintMode(ctx, args, version)
986 case ModeStream:
987 return runStreamMode(ctx, args, version)
988 case ModeJSON:
989 return runJSONMode(ctx, args, version)
990 case ModeRPC:
991 return runRPCMode(ctx, args, version)
992 default:
993 return runInteractive(ctx, args, version)
994 }
995}
996
997// ---- print / json modes: require credentials, run single-shot ----
998
999// nonInteractiveExtHooks is the HostHooks impl used by print / json
1000// modes. They have no TUI, so notify / display go to stderr and
1001// submit / insert are no-ops (the extension can't steer a
1002// single-shot run once it's in flight anyway).
1003type nonInteractiveExtHooks struct{}
1004
1005func (nonInteractiveExtHooks) Notify(ext, level, message string) {
1006 fmt.Fprintf(os.Stderr, "[%s] %s: %s\n", ext, level, message)
1007}
1008func (nonInteractiveExtHooks) Alert(string, extproto.AlertRequest) {}
1009func (nonInteractiveExtHooks) Submit(string) {}
1010func (nonInteractiveExtHooks) SubmitSlash(string) {}
1011func (nonInteractiveExtHooks) Insert(string) {}
1012func (nonInteractiveExtHooks) Display(string, string) {}
1013func (nonInteractiveExtHooks) ClearNotes(string) {}
1014func (nonInteractiveExtHooks) OpenPanel(string, extproto.PanelSpec) {}
1015func (nonInteractiveExtHooks) UpdatePanel(string, string, string, []string, string) {}
1016func (nonInteractiveExtHooks) ClosePanel(string, string) {}
1017func (nonInteractiveExtHooks) SetStatus(string, string, string, string) {}
1018func (nonInteractiveExtHooks) SetWidget(string, string, string, string, []string) {}
1019func (nonInteractiveExtHooks) ClearWidget(string, string) {}
1020
1021// setupNonInteractiveExtensions loads --ext paths and (unless
1022// --no-ext) runs discovery. Returns the manager so the caller can
1023// wire tools into the resolved registry, and a cleanup closure to
1024// defer. Mirrors the interactive-mode setup minus the TUI hooks.
1025func setupNonInteractiveExtensions(ctx context.Context, args Args, r *Resolved, version string) (*extensions.Manager, func()) {
1026 extMgr := extensions.New(ZutHome(), r.CWD, version, r.Provider, r.Model, nonInteractiveExtHooks{})
1027 for _, e := range extMgr.LoadExplicit(ctx, args.Exts) {
1028 fmt.Fprintln(os.Stderr, "extension load:", e)
1029 }
1030 if !args.NoExt {
1031 for _, e := range extMgr.Discover(ctx) {
1032 fmt.Fprintln(os.Stderr, "extension load:", e)
1033 }
1034 }
1035 extMgr.WaitForReady(3 * time.Second)
1036 r.MergeExtensionTools(&extToolAdapter{mgr: extMgr})
1037 return extMgr, func() { extMgr.Stop(2 * time.Second) }
1038}
1039
1040// wireNonInteractiveAgentExtHooks installs the same BeforeToolExecute
1041// / BeforeTurn / BeforeAssistantMessage / OnEvent hooks the
1042// interactive path wires up, so extensions get their normal
1043// event-intercept surface in print / json / rpc flows too.
1044func wireNonInteractiveAgentExtHooks(ctx context.Context, ag *core.Agent, extMgr *extensions.Manager) {
1045 if ag == nil || extMgr == nil {
1046 return
1047 }
1048 ag.BeforeToolExecute = func(call provider.ToolCallBlock) (bool, string, json.RawMessage) {
1049 res := extMgr.InterceptToolCall(ctx, call.ID, call.Name, call.Arguments)
1050 if res.Block {
1051 return false, res.Reason, nil
1052 }
1053 return true, "", res.ModifiedArgs
1054 }
1055 ag.BeforeTurnContext = func(turnCtx context.Context, step int) (bool, string, string) {
1056 res := extMgr.InterceptTurnStart(turnCtx, step)
1057 return !res.Block, res.Reason, res.Context
1058 }
1059 ag.BeforeAssistantMessage = func(text string) (bool, string, string) {
1060 res := extMgr.InterceptAssistantMessage(ctx, text)
1061 if res.Block {
1062 return false, res.Reason, ""
1063 }
1064 return true, "", res.ReplaceText
1065 }
1066 ag.OnEvent = func(ev core.AgentEvent) { fanoutAgentEvent(extMgr, ev) }
1067}
1068
1069type printStats struct {
1070 Provider string `json:"provider"`
1071 Model string `json:"model"`
1072 PromptTokens int `json:"prompt_tokens"`
1073 ReasoningTokens *int `json:"reasoning_tokens"`
1074 GeneratedOutputTokens int `json:"generated_output_tokens"`
1075 ElapsedMS int64 `json:"elapsed_ms"`
1076}
1077
1078func writePrintStats(path, providerID, model string, usage provider.Usage, elapsed time.Duration) error {
1079 var reasoning *int
1080 generated := usage.OutputTokens
1081 if usage.ReasoningTokensKnown {
1082 count := usage.ReasoningTokens
1083 reasoning = &count
1084 generated -= count
1085 if generated < 0 {
1086 generated = 0
1087 }
1088 }
1089 stats := printStats{
1090 Provider: providerID,
1091 Model: model,
1092 PromptTokens: usage.InputTokens + usage.CacheReadTokens + usage.CacheWriteTokens,
1093 ReasoningTokens: reasoning,
1094 GeneratedOutputTokens: generated,
1095 ElapsedMS: elapsed.Milliseconds(),
1096 }
1097 data, err := json.MarshalIndent(stats, "", " ")
1098 if err != nil {
1099 return fmt.Errorf("encode stats: %w", err)
1100 }
1101 data = append(data, '\n')
1102 if err := os.WriteFile(path, data, 0o644); err != nil {
1103 return fmt.Errorf("write stats %q: %w", path, err)
1104 }
1105 return nil
1106}
1107
1108func runPrintMode(ctx context.Context, args Args, version string) (runErr error) {
1109 if args.Orchestrate {
1110 return runOrchestratedPrintMode(ctx, args, version)
1111 }
1112 if args.NoYolo {
1113 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in print mode (no interactive prompt available); tools will run without confirmation")
1114 }
1115 r, err := Resolve(args, true)
1116 if err != nil {
1117 return err
1118 }
1119 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
1120 defer stopExt()
1121
1122 ag := r.NewAgent()
1123 initialAg := ag
1124 defer func() {
1125 closeAgentLSP(ag)
1126 if ag != initialAg {
1127 closeAgentLSP(initialAg)
1128 }
1129 }()
1130 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
1131 sess, err := openOrCreateSession(ctx, args, r, ag, version)
1132 if err != nil {
1133 return err
1134 }
1135 if sess != nil {
1136 var providerName, model string
1137 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
1138 if err != nil {
1139 return err
1140 }
1141 r.Provider, r.Model = providerName, model
1142 ag.CommitToolResult = func(_ string, result core.ToolResult) error { return persistToolResultState(extMgr, sess, result) }
1143 defer func() { runErr = joinSessionCloseError(runErr, sess) }()
1144 }
1145 announceSession(extMgr, sess)
1146 wireRetryLifecyclePersistence(ag, sess)
1147 if sess != nil {
1148 defer func() { runErr = errors.Join(runErr, sess.FlushRetryLifecycle(ag.LastTurnUsage(), ag.Cost())) }()
1149 }
1150
1151 piped, _ := readAllStdin()
1152 prompt := combinePromptInput(piped, args.Prompt)
1153 if prompt == "" {
1154 return fmt.Errorf("print mode requires a prompt (arg or stdin)")
1155 }
1156
1157 start := len(ag.Messages())
1158 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, nil, os.Stderr); err != nil {
1159 return err
1160 }
1161 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
1162 return err
1163 }
1164 var persistCompaction func([]provider.Message) error
1165 if sess != nil {
1166 persistCompaction = sess.AppendCompaction
1167 }
1168 started := time.Now()
1169 usage, recovery, err := modes.RunPrintWithContextRecovery(ctx, ag, prompt, nil, os.Stdout, persistCompaction)
1170 elapsed := time.Since(started)
1171 transcriptStart := start
1172 if recovery.Compacted {
1173 transcriptStart = recovery.OutputStart
1174 }
1175 if persistErr := WriteNewTranscript(ag, sess, transcriptStart); persistErr != nil {
1176 if err != nil {
1177 return errors.Join(err, persistErr)
1178 }
1179 return persistErr
1180 }
1181 if err != nil {
1182 return err
1183 }
1184 if args.StatsPath != "" {
1185 return writePrintStats(args.StatsPath, r.Provider, r.Model, usage, elapsed)
1186 }
1187 return nil
1188}
1189
1190func runStreamMode(ctx context.Context, args Args, version string) (runErr error) {
1191 if args.Orchestrate {
1192 return runOrchestratedStreamMode(ctx, args, version)
1193 }
1194 if args.NoYolo {
1195 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in stream mode (no interactive prompt available); tools will run without confirmation")
1196 }
1197 r, err := Resolve(args, true)
1198 if err != nil {
1199 return err
1200 }
1201 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
1202 defer stopExt()
1203
1204 ag := r.NewAgent()
1205 initialAg := ag
1206 defer func() {
1207 closeAgentLSP(ag)
1208 if ag != initialAg {
1209 closeAgentLSP(initialAg)
1210 }
1211 }()
1212 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
1213 sess, err := openOrCreateSession(ctx, args, r, ag, version)
1214 if err != nil {
1215 return err
1216 }
1217 if sess != nil {
1218 var providerName, model string
1219 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
1220 if err != nil {
1221 return err
1222 }
1223 r.Provider, r.Model = providerName, model
1224 ag.CommitToolResult = func(_ string, result core.ToolResult) error { return persistToolResultState(extMgr, sess, result) }
1225 defer func() { runErr = joinSessionCloseError(runErr, sess) }()
1226 }
1227 announceSession(extMgr, sess)
1228 wireRetryLifecyclePersistence(ag, sess)
1229 if sess != nil {
1230 defer func() { runErr = errors.Join(runErr, sess.FlushRetryLifecycle(ag.LastTurnUsage(), ag.Cost())) }()
1231 }
1232
1233 piped, _ := readAllStdin()
1234 prompt := combinePromptInput(piped, args.Prompt)
1235 if prompt == "" {
1236 return fmt.Errorf("stream mode requires a prompt (arg or stdin)")
1237 }
1238
1239 start := len(ag.Messages())
1240 preSink, finishPre := newStreamTextSink(os.Stdout)
1241 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, preSink, os.Stderr); err != nil {
1242 finishPre()
1243 return err
1244 }
1245 finishPre()
1246 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
1247 return err
1248 }
1249 var persistCompaction func([]provider.Message) error
1250 if sess != nil {
1251 persistCompaction = sess.AppendCompaction
1252 }
1253 recovery, err := modes.RunStreamWithContextRecovery(ctx, ag, prompt, nil, os.Stdout, os.Stderr, persistCompaction)
1254 transcriptStart := start
1255 if recovery.Compacted {
1256 transcriptStart = recovery.OutputStart
1257 }
1258 if persistErr := WriteNewTranscript(ag, sess, transcriptStart); persistErr != nil {
1259 if err != nil {
1260 return errors.Join(err, persistErr)
1261 }
1262 return persistErr
1263 }
1264 return err
1265}
1266
1267func newStreamTextSink(out io.Writer) (func(core.AgentEvent), func()) {
1268 var streamed, wroteText, lastWasNL bool
1269 writeText := func(text string) {
1270 if text == "" {
1271 return
1272 }
1273 _, _ = fmt.Fprint(out, text)
1274 if syncer, ok := out.(interface{ Sync() error }); ok {
1275 _ = syncer.Sync()
1276 }
1277 wroteText = true
1278 lastWasNL = strings.HasSuffix(text, "\n")
1279 }
1280 sink := func(ev core.AgentEvent) {
1281 switch e := ev.(type) {
1282 case core.EvAssistantStart:
1283 streamed = false
1284 case core.EvTextDelta:
1285 streamed = true
1286 writeText(e.Delta)
1287 case core.EvAssistantMessage:
1288 if streamed {
1289 return
1290 }
1291 var text strings.Builder
1292 for _, content := range e.Message.Content {
1293 if block, ok := content.(provider.TextBlock); ok {
1294 if text.Len() > 0 {
1295 text.WriteString("\n")
1296 }
1297 text.WriteString(block.Text)
1298 }
1299 }
1300 writeText(text.String())
1301 }
1302 }
1303 finish := func() {
1304 if wroteText && !lastWasNL {
1305 writeText("\n")
1306 }
1307 }
1308 return sink, finish
1309}
1310
1311func runJSONMode(ctx context.Context, args Args, version string) (runErr error) {
1312 if args.Orchestrate {
1313 return runOrchestratedJSONMode(ctx, args, version)
1314 }
1315 if args.NoYolo {
1316 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in json mode (no interactive prompt available); tools will run without confirmation")
1317 }
1318 r, err := Resolve(args, true)
1319 if err != nil {
1320 return err
1321 }
1322 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
1323 defer stopExt()
1324
1325 ag := r.NewAgent()
1326 initialAg := ag
1327 defer func() {
1328 closeAgentLSP(ag)
1329 if ag != initialAg {
1330 closeAgentLSP(initialAg)
1331 }
1332 }()
1333 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
1334 sess, err := openOrCreateSession(ctx, args, r, ag, version)
1335 if err != nil {
1336 return err
1337 }
1338 if sess != nil {
1339 var providerName, model string
1340 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
1341 if err != nil {
1342 return err
1343 }
1344 r.Provider, r.Model = providerName, model
1345 ag.CommitToolResult = func(_ string, result core.ToolResult) error { return persistToolResultState(extMgr, sess, result) }
1346 defer func() { runErr = joinSessionCloseError(runErr, sess) }()
1347 }
1348 announceSession(extMgr, sess)
1349 wireRetryLifecyclePersistence(ag, sess)
1350 if sess != nil {
1351 defer func() { runErr = errors.Join(runErr, sess.FlushRetryLifecycle(ag.LastTurnUsage(), ag.Cost())) }()
1352 }
1353
1354 piped, _ := readAllStdin()
1355 prompt := combinePromptInput(piped, args.Prompt)
1356 if prompt == "" {
1357 return fmt.Errorf("json mode requires a prompt (arg or stdin)")
1358 }
1359
1360 start := len(ag.Messages())
1361 enc := json.NewEncoder(os.Stdout)
1362 preSink := func(ev core.AgentEvent) {
1363 _ = enc.Encode(modes.EventToJSON(ev))
1364 }
1365 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, preSink, os.Stderr); err != nil {
1366 _ = enc.Encode(map[string]any{"type": "error", "message": err.Error()})
1367 return err
1368 }
1369 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
1370 _ = enc.Encode(map[string]any{"type": "error", "message": err.Error()})
1371 return err
1372 }
1373 var persistCompaction func([]provider.Message) error
1374 if sess != nil {
1375 persistCompaction = sess.AppendCompaction
1376 }
1377 recovery, err := modes.RunJSONWithContextRecovery(ctx, ag, prompt, nil, os.Stdout, persistCompaction)
1378 transcriptStart := start
1379 if recovery.Compacted {
1380 transcriptStart = recovery.OutputStart
1381 }
1382 if persistErr := WriteNewTranscript(ag, sess, transcriptStart); persistErr != nil {
1383 finalErr := persistErr
1384 if err != nil {
1385 finalErr = errors.Join(err, persistErr)
1386 }
1387 _ = enc.Encode(map[string]any{"type": "error", "message": finalErr.Error()})
1388 return finalErr
1389 }
1390 return err
1391}
1392
1393// runZutfileStartupPre runs entry.pre before the main non-interactive prompt.
1394// "!command" values execute via BashTool; other values are sent as an agent turn.
1395// shellOut receives live shell chunks (typically os.Stderr); sink receives
1396// agent events for plain-text pre (stream mode wires a live text sink).
1397func runZutfileStartupPre(ctx context.Context, pre, cwd string, sandbox *tools.Sandbox, ag *core.Agent, sink func(core.AgentEvent), shellOut io.Writer) error {
1398 pre = strings.TrimSpace(pre)
1399 if pre == "" {
1400 return nil
1401 }
1402 if cmd, ok := modes.ShellEscapeCommand(pre); ok {
1403 raw, err := json.Marshal(map[string]any{
1404 "command": cmd,
1405 "timeout": modes.ShellEscapeTimeoutSeconds,
1406 })
1407 if err != nil {
1408 return err
1409 }
1410 if shellOut != nil {
1411 fmt.Fprintf(shellOut, "$ %s\n", cmd)
1412 if f, ok := shellOut.(interface{ Sync() error }); ok {
1413 _ = f.Sync()
1414 }
1415 }
1416 progress := func(chunk string) {
1417 if shellOut == nil || chunk == "" {
1418 return
1419 }
1420 fmt.Fprint(shellOut, chunk)
1421 if f, ok := shellOut.(interface{ Sync() error }); ok {
1422 _ = f.Sync()
1423 }
1424 }
1425 bash := &tools.BashTool{CWD: cwd, Sandbox: sandbox}
1426 res, err := bash.Execute(ctx, raw, progress)
1427 if err != nil {
1428 return fmt.Errorf("zutfile entry.pre: %w", err)
1429 }
1430 if res.IsError {
1431 var sb strings.Builder
1432 for _, c := range res.Content {
1433 if tb, ok := c.(provider.TextBlock); ok {
1434 sb.WriteString(tb.Text)
1435 }
1436 }
1437 msg := strings.TrimSpace(sb.String())
1438 if msg == "" {
1439 msg = "command failed"
1440 }
1441 return fmt.Errorf("zutfile entry.pre: %s", msg)
1442 }
1443 return nil
1444 }
1445 if ag == nil {
1446 return fmt.Errorf("zutfile entry.pre requires an agent for non-shell prompts")
1447 }
1448 if sink == nil {
1449 sink = func(core.AgentEvent) {}
1450 }
1451 return ag.Prompt(ctx, pre, nil, sink)
1452}
1453
1454var errInteractiveAgentChanged = errors.New("interactive agent or web-search policy changed during prompt refresh")
1455
1456// refreshAgentToolsAndPrompt re-resolves tools (including rediscovered
1457// skills and currently loaded extension tools) and updates the live
1458// agent's registry and system prompt. Used after /reload-ext and after
1459// zutfile entry.pre installs new skills or extensions.
1460// mutateRegistry, if non-nil, can inject session-specific tools (e.g. the subagent tool).
1461// interactive, when non-nil, serializes the final commit with agent replacement.
1462func refreshAgentToolsAndPrompt(args Args, sharedSandbox *tools.Sandbox, extToolAdapter ExtensionToolSource, ag *core.Agent, mutateRegistry func(core.Registry) core.Registry, interactive *modes.Interactive) (subagents.WebSearchPolicy, error) {
1463 if ag == nil {
1464 return subagents.WebSearchDeny, nil
1465 }
1466 var webSearchPolicyGeneration uint64
1467 if interactive != nil {
1468 // Capture before Resolve: the final commit must fail if settings,
1469 // Telegram attachment, or a newer registry commit changes policy while
1470 // filesystem/config/extension discovery is in flight.
1471 webSearchPolicyGeneration = interactive.WebSearchPolicyGeneration()
1472 }
1473 resolved, err := Resolve(args, true)
1474 if err != nil {
1475 return subagents.WebSearchDeny, fmt.Errorf("refresh agent prompt and tools: %w", err)
1476 }
1477 if sharedSandbox != nil {
1478 resolved.UseSandbox(sharedSandbox)
1479 }
1480 if extToolAdapter != nil {
1481 resolved.MergeExtensionTools(extToolAdapter)
1482 }
1483 reg := resolved.ToolRegistry
1484 if resolved.WebSearchPolicy != subagents.WebSearchAllow {
1485 tools.RemoveWebCapabilities(reg)
1486 }
1487 if mutateRegistry != nil {
1488 reg = mutateRegistry(reg)
1489 }
1490 if interactive != nil {
1491 oldTools, applied := interactive.ApplyAgentPromptConfigAtWebSearchGeneration(ag, resolved.SystemPrompt, reg, webSearchPolicyGeneration)
1492 if !applied {
1493 _ = tools.CloseLSPManagers(reg)
1494 return subagents.WebSearchDeny, errInteractiveAgentChanged
1495 }
1496 interactive.DeferUntilIdle(func() {
1497 _ = tools.CloseLSPManagers(oldTools)
1498 })
1499 return webSearchPolicyForRegistry(resolved.WebSearchPolicy, ag.ToolsSnapshot()), nil
1500 }
1501 oldTools := ag.SetPromptConfig(resolved.SystemPrompt, reg)
1502 _ = tools.CloseLSPManagers(oldTools)
1503 return webSearchPolicyForRegistry(resolved.WebSearchPolicy, reg), nil
1504}
1505
1506func webSearchPolicyForRegistry(policy subagents.WebSearchPolicy, reg core.Registry) subagents.WebSearchPolicy {
1507 if policy != subagents.WebSearchAllow {
1508 return subagents.WebSearchDeny
1509 }
1510 for _, name := range tools.WebCapabilityNames {
1511 if _, ok := reg[name]; !ok {
1512 return subagents.WebSearchDeny
1513 }
1514 }
1515 return subagents.WebSearchAllow
1516}
1517
1518func webSearchToolAllowedForSession(args Args) bool {
1519 if args.NoTools || args.PermissionSet != nil {
1520 return false
1521 }
1522 if args.ToolsSet || len(args.Tools) > 0 {
1523 return toolListContains(args.Tools, "web_search")
1524 }
1525 return true
1526}
1527
1528func webSearchExplicitlyEnabledForSession(args Args) bool {
1529 return !args.NoTools && args.PermissionSet == nil && (args.ToolsSet || len(args.Tools) > 0) && toolListContains(args.Tools, "web_search")
1530}
1531
1532// reloadResourcesAfterStartupPre reloads extensions (if any) and
1533// refreshes the agent tool registry + system prompt so skills/extensions
1534// installed by entry.pre are visible to the following turn.
1535func reloadResourcesAfterStartupPre(ctx context.Context, args Args, extMgr *extensions.Manager, sharedSandbox *tools.Sandbox, ag *core.Agent) error {
1536 _, err := reloadResourcesAfterStartupPreWithRegistry(ctx, args, extMgr, sharedSandbox, ag, nil)
1537 return err
1538}
1539
1540func reloadResourcesAfterStartupPreWithRegistry(ctx context.Context, args Args, extMgr *extensions.Manager, sharedSandbox *tools.Sandbox, ag *core.Agent, mutateRegistry func(core.Registry) core.Registry) (subagents.WebSearchPolicy, error) {
1541 if strings.TrimSpace(args.StartupPre) == "" || ag == nil {
1542 return subagents.WebSearchDeny, nil
1543 }
1544 adapter := &extToolAdapter{mgr: extMgr}
1545 if extMgr != nil {
1546 _ = extMgr.Reload(ctx, 2*time.Second)
1547 }
1548 return refreshAgentToolsAndPrompt(args, sharedSandbox, adapter, ag, mutateRegistry, nil)
1549}
1550
1551// ---- interactive mode: opens the TUI even without credentials ----
1552
1553func interactiveQuickModelShortcuts(shortcuts []QuickModelShortcut) []modes.QuickModelShortcut {
1554 result := make([]modes.QuickModelShortcut, len(shortcuts))
1555 for idx, s := range shortcuts {
1556 p := normalizedModelProfile(s)
1557 result[idx] = modes.QuickModelShortcut{Provider: p.Provider, Model: p.Model, Reasoning: p.Reasoning, FastMode: p.FastMode}
1558 }
1559 return result
1560}
1561
1562func runInteractive(ctx context.Context, args Args, version string) (runErr error) {
1563 initialCfg, _ := LoadConfig()
1564 if initialCfg.Goals.MaxTokenBudget != nil && *initialCfg.Goals.MaxTokenBudget == 0 {
1565 return errors.New("goals.max_token_budget must be greater than zero")
1566 }
1567 // Resolve WITHOUT requiring credentials.
1568 r, err := Resolve(args, false)
1569 if err != nil {
1570 return err
1571 }
1572 // Resolve may have repaired a stale favorite. Use the saved repair for
1573 // the UI's active-profile comparison instead of the pre-resolution copy.
1574 if resolvedCfg, err := LoadConfig(); err == nil {
1575 initialCfg.QuickModelShortcuts = resolvedCfg.QuickModelShortcuts
1576 initialCfg.ActiveModelProfile = resolvedCfg.ActiveModelProfile
1577 }
1578
1579 authStore := AuthStoreFor()
1580 mgr := auth.NewManager(authStore)
1581 defer mgr.Close()
1582
1583 // Keep the sandbox pointer stable across agent rebuilds (login / model
1584 // switch). The Interactive UI toggles the lock via this pointer, and
1585 // rebuilt tool instances must share the same one so the lock sticks.
1586 sharedSandbox := r.Sandbox
1587
1588 // persistMu guards the active session and selection across the agent
1589 // loop, TUI callbacks, and session swaps. Declare it before tool
1590 // construction because subagent defaults must read the live selection too.
1591 var persistMu sync.Mutex
1592 // Serialize session transitions with persistence callbacks so a candidate
1593 // is read only after the old agent is flushed and cannot be overwritten by
1594 // an in-flight append before commit.
1595 var sessionTransitionMu sync.RWMutex
1596 activeProvider := r.Provider
1597 activeModel := r.Model
1598 var sess *core.Session
1599 scheduleEngine := scheduler.NewEngine(nil)
1600 var scheduledSessionMu sync.Mutex
1601 scheduledSessionLocks := make(map[string]*sync.Mutex)
1602 lockScheduledSession := func(sessionID string) func() {
1603 scheduledSessionMu.Lock()
1604 lock := scheduledSessionLocks[sessionID]
1605 if lock == nil {
1606 lock = new(sync.Mutex)
1607 scheduledSessionLocks[sessionID] = lock
1608 }
1609 scheduledSessionMu.Unlock()
1610 lock.Lock()
1611 return lock.Unlock
1612 }
1613
1614 // Build the extension manager BEFORE the agent so we can fold
1615 // extension-defined tools into the registry. Attach the interactive
1616 // host after constructing it below so startup alerts can be buffered.
1617 var iv *modes.Interactive
1618 extHooks := &interactiveExtHooks{}
1619 extMgr := extensions.New(ZutHome(), r.CWD, version, r.Provider, r.Model, extHooks)
1620 var startupExtensionErrors []string
1621 // --ext paths first so they win against installed extensions of
1622 // the same name (loadOne's first-write-wins semantics).
1623 for _, e := range extMgr.LoadExplicit(ctx, args.Exts) {
1624 startupExtensionErrors = append(startupExtensionErrors, e.Error())
1625 }
1626 // --no-ext skips the global + project-local discovery scan;
1627 // explicit --ext paths above are still honoured so you can run
1628 // "only this extension" with --no-ext --ext ./x.
1629 if !args.NoExt {
1630 for _, e := range extMgr.Discover(ctx) {
1631 startupExtensionErrors = append(startupExtensionErrors, e.Error())
1632 }
1633 }
1634 // Wait briefly for extensions to flush their initial register_tool
1635 // frames before we build the agent's tool registry. Half a second
1636 // is plenty for any extension that's actually well-behaved; ones
1637 // that don't send a ready frame eat the full grace and proceed.
1638 // 3s is the per-extension grace period for the ready frame.
1639 // Native binaries are instant; runtimes like `npx tsx` take ~1.5s
1640 // from cold cache. The wait is tight only for extensions that
1641 // haven't sent ready by then; ones that signalled earlier release
1642 // the wait immediately.
1643 extMgr.WaitForReady(3 * time.Second)
1644 defer extMgr.Stop(2 * time.Second)
1645
1646 extToolAdapter := &extToolAdapter{mgr: extMgr}
1647 r.MergeExtensionTools(extToolAdapter)
1648 webSearchGuard := &webSearchSessionGuard{}
1649
1650 // Keep the shared subagent runtime in the outer scope: session reloads,
1651 // dashboard updates, agent rebuilds, and shutdown all use the same owner.
1652 var runtime *subagentRuntime
1653 onResidentAccepted := func(spec subagents.ResidentChildSpec, turnID, _ string) {
1654 if iv != nil {
1655 iv.TrackResidentSubagent(spec.ID, turnID)
1656 }
1657 }
1658 onResidentCompletion := func(completion subagents.ResidentCompletion) {
1659 if iv != nil {
1660 iv.ReportResidentSubagent(completion)
1661 }
1662 }
1663 activeProviderForSubagents := func() string {
1664 persistMu.Lock()
1665 defer persistMu.Unlock()
1666 return activeProvider
1667 }
1668 activeModelForSubagents := func() string {
1669 persistMu.Lock()
1670 defer persistMu.Unlock()
1671 return activeModel
1672 }
1673
1674 runtime = newSubagentRuntime(subagentRuntimeConfig{
1675 Args: args,
1676 Root: filepath.Join(ZutHome(), "subagents"),
1677 RepoRoot: r.CWD,
1678 Provider: r.Provider,
1679 Model: r.Model,
1680 Reasoning: r.Reasoning,
1681 BaseURL: r.BaseURL,
1682 InsecureTLS: r.InsecureTLS,
1683 FastMode: r.FastMode,
1684 ContextWindow: r.ContextWindow,
1685 Policy: subagentPolicyFromConfig(initialCfg.Subagents),
1686 WebSearchPolicy: webSearchPolicyForRegistry(r.WebSearchPolicy, r.ToolRegistry),
1687 WebSearchGuard: webSearchGuard,
1688 ActiveProvider: activeProviderForSubagents,
1689 ActiveModel: activeModelForSubagents,
1690 OnResidentSpawned: onResidentAccepted,
1691 ResidentCompletion: onResidentCompletion,
1692 })
1693 reloadDone := make(chan struct{})
1694 var reloadErrs []error
1695 if resident := runtime.ResidentManager(); resident != nil {
1696 // Resident reconciliation reads only the new journal format. It marks
1697 // active durable work interrupted and exposes it for an explicit new
1698 // prompt; it never constructs a child or replays an accepted task.
1699 go func() {
1700 reloadErrs = resident.Reconcile()
1701 close(reloadDone)
1702 }()
1703 } else {
1704 close(reloadDone)
1705 }
1706 defer func() {
1707 <-reloadDone
1708 _ = closeSubagentRuntimeFresh(runtime)
1709 }()
1710
1711 prepareInteractiveRegistry := runtime.PrepareRegistry
1712 prepareResolvedInteractiveRegistry := runtime.PrepareResolvedRegistry
1713 prepareResolvedInteractiveRegistry(r.ToolRegistry, r.WebSearchPolicy)
1714 initialWebSearchPolicy := webSearchPolicyForRegistry(r.WebSearchPolicy, r.ToolRegistry)
1715 webSearchGuard.setAvailable(initialWebSearchPolicy == subagents.WebSearchAllow)
1716 runtime.SetWebSearchPolicy(initialWebSearchPolicy)
1717 resolveSubagent := runtime.resolveSubagent
1718
1719 // Confirmation gate: when --no-yolo is on, the agent must ask
1720 // the user before every tool call. In interactive mode the TUI
1721 // provides the Confirmer; in print/json/rpc modes there's no
1722 // way to prompt, so the gate is constructed with a nil inner
1723 // which auto-refuses every call with a helpful reason.
1724 var confirmGate *core.ConfirmGate
1725 if args.NoYolo {
1726 confirmGate = core.NewConfirmGate(nil) // set below for interactive
1727 }
1728
1729 // Capture current args in a closure so BuildAgent can re-resolve
1730 // after a successful login (picks up the newly stored credential).
1731 wireAgentExt := func(a *core.Agent) *core.Agent {
1732 if a == nil {
1733 return a
1734 }
1735 a.BeforeToolExecute = func(call provider.ToolCallBlock) (bool, string, json.RawMessage) {
1736 // Guards run before confirmation because they may rewrite the
1737 // arguments. The user must approve the effective call that will
1738 // actually execute, not the model's original arguments.
1739 r := extMgr.InterceptToolCall(ctx, call.ID, call.Name, call.Arguments)
1740 if r.Block {
1741 return false, r.Reason, nil
1742 }
1743 effectiveArgs := call.Arguments
1744 if len(r.ModifiedArgs) > 0 && json.Valid(r.ModifiedArgs) {
1745 effectiveArgs = r.ModifiedArgs
1746 }
1747 if confirmGate != nil {
1748 var content strings.Builder
1749 // The remembered "always allow" grant is keyed by tool name,
1750 // or a finer per-action key when the tool asks for one (the
1751 // subagent facade). Compute it from the effective args so a
1752 // grant matches the call that will actually run.
1753 _, currentTools := a.PromptConfig()
1754 confirmationKey := confirmationKeyFor(currentTools, call.Name, effectiveArgs)
1755 if tool, err := currentTools.Get(call.Name); err == nil {
1756 if previewer, ok := tool.(core.ToolPreviewer); ok {
1757 preview, err := previewer.Preview(ctx, effectiveArgs)
1758 if err != nil {
1759 return false, err.Error(), nil
1760 }
1761 for _, block := range preview.Content {
1762 if text, ok := block.(provider.TextBlock); ok {
1763 if content.Len() > 0 {
1764 content.WriteString("\n")
1765 }
1766 content.WriteString(text.Text)
1767 }
1768 }
1769 }
1770 }
1771 ok, reason, _ := confirmGate.CheckToolCall(core.ToolCallConfirmation{
1772 ID: call.ID,
1773 Name: call.Name,
1774 Key: confirmationKey,
1775 Summary: core.BuildPreview(effectiveArgs, 120),
1776 Content: content.String(),
1777 Origin: call.Origin,
1778 })
1779 if !ok {
1780 return false, reason, nil
1781 }
1782 }
1783 return true, "", r.ModifiedArgs
1784 }
1785 a.BeforeTurnContext = func(turnCtx context.Context, step int) (bool, string, string) {
1786 r := extMgr.InterceptTurnStart(turnCtx, step)
1787 return !r.Block, r.Reason, r.Context
1788 }
1789 a.BeforeAssistantMessage = func(text string) (bool, string, string) {
1790 r := extMgr.InterceptAssistantMessage(ctx, text)
1791 if r.Block {
1792 return false, r.Reason, ""
1793 }
1794 return true, "", r.ReplaceText
1795 }
1796 a.OnEvent = func(ev core.AgentEvent) { fanoutAgentEvent(extMgr, ev) }
1797 runtime.WireRequiredWorkerGate(a)
1798 return a
1799 }
1800
1801 scheduleTool := &tools.ScheduleTool{
1802 Engine: scheduleEngine,
1803 SessionID: func() string {
1804 persistMu.Lock()
1805 defer persistMu.Unlock()
1806 if sess == nil {
1807 return ""
1808 }
1809 return sess.ID
1810 },
1811 Location: func() *time.Location { return time.Local },
1812 }
1813 schedulerAllowed := !args.NoTools && (!args.ToolsSet && len(args.Tools) == 0 || toolListContains(args.Tools, tools.ScheduleToolName))
1814 installSchedulerTool := func(registry core.Registry) core.Registry {
1815 if schedulerAllowed {
1816 registry[tools.ScheduleToolName] = scheduleTool
1817 }
1818 return registry
1819 }
1820 installSchedulerTool(r.ToolRegistry)
1821 prepareInteractiveRegistryWithScheduler := func(registry core.Registry) core.Registry {
1822 return prepareInteractiveRegistry(installSchedulerTool(registry))
1823 }
1824
1825 var ag *core.Agent
1826 buildAgent := func() (*core.Agent, string, string, error) {
1827 resolved, err := Resolve(args, true)
1828 if err != nil {
1829 return nil, "", "", err
1830 }
1831 resolved.UseSandbox(sharedSandbox)
1832 runtime.SetProvider(resolved.Provider)
1833 runtime.SetModel(resolved.Model)
1834 runtime.SetContextWindow(resolved.ContextWindow)
1835 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1836 runtime.SetFastMode(resolved.FastMode)
1837 resolved.MergeExtensionTools(extToolAdapter)
1838 installSchedulerTool(resolved.ToolRegistry)
1839 prepareResolvedInteractiveRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
1840 return wireAgentExt(resolved.newInteractiveAgent()), resolved.Provider, resolved.Model, nil
1841 }
1842
1843 // Rebuild agent with an explicit provider/model override.
1844 buildAgentFor := func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1845 next := args
1846 if providerOverride != "" {
1847 next.Provider = providerOverride
1848 }
1849 if modelOverride != "" {
1850 next.Model = modelOverride
1851 }
1852 resolved, err := Resolve(next, true)
1853 if err != nil {
1854 return nil, "", "", err
1855 }
1856 resolved.UseSandbox(sharedSandbox)
1857 runtime.SetProvider(resolved.Provider)
1858 runtime.SetModel(resolved.Model)
1859 runtime.SetContextWindow(resolved.ContextWindow)
1860 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1861 runtime.SetFastMode(resolved.FastMode)
1862 resolved.MergeExtensionTools(extToolAdapter)
1863 installSchedulerTool(resolved.ToolRegistry)
1864 prepareResolvedInteractiveRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
1865 return wireAgentExt(resolved.newInteractiveAgent()), resolved.Provider, resolved.Model, nil
1866 }
1867
1868 // Rebuild agent for the rescue picker after a recoverable failure.
1869 // Unlike buildAgentFor, this drops launch-time --api-key and
1870 // --base-url overrides because those are typically the cause of the
1871 // rescue (a bad key, a typo'd base URL, or a corporate gateway that
1872 // only the originally-picked provider needed). Re-resolving without
1873 // them lets the rescue retry use env vars / auth.json / provider
1874 // defaults the way zut would have without the overrides.
1875 buildAgentForRescue := func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1876 next := args
1877 next.APIKey = ""
1878 next.BaseURL = ""
1879 if providerOverride != "" {
1880 next.Provider = providerOverride
1881 }
1882 if modelOverride != "" {
1883 next.Model = modelOverride
1884 }
1885 resolved, err := Resolve(next, true)
1886 if err != nil {
1887 return nil, "", "", err
1888 }
1889 resolved.UseSandbox(sharedSandbox)
1890 runtime.SetProvider(resolved.Provider)
1891 runtime.SetModel(resolved.Model)
1892 runtime.SetContextWindow(resolved.ContextWindow)
1893 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1894 runtime.SetFastMode(resolved.FastMode)
1895 resolved.MergeExtensionTools(extToolAdapter)
1896 installSchedulerTool(resolved.ToolRegistry)
1897 prepareResolvedInteractiveRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
1898 return wireAgentExt(resolved.newInteractiveAgent()), resolved.Provider, resolved.Model, nil
1899 }
1900
1901 if r.HasCredential() {
1902 ag = wireAgentExt(r.newInteractiveAgent())
1903 }
1904
1905 // /reload-ext callback: after the manager has respawned every
1906 // extension, re-resolve the tool registry (built-ins + freshly-
1907 // registered extension tools) and swap it onto the current
1908 // agent in-place. The current agent may have been replaced by a
1909 // /model swap since spawn, so re-read the live `ag` on each
1910 // invocation.
1911 extMgr.SetOnReload(func() {
1912 current := liveInteractiveAgent(iv, ag)
1913 if current == nil {
1914 return
1915 }
1916 if _, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistryWithScheduler, iv); err != nil && iv != nil {
1917 iv.ReportError(err)
1918 }
1919 })
1920
1921 var sessBaselineMsgs int // messages already on disk when current session opened
1922 var sessionTitlePending bool
1923 // initialPlanSnapshots is reconstructed from the untrimmed resumed
1924 // transcript. The interactive seeds from it because the live agent only
1925 // receives the trim window after a resume.
1926 var initialPlanSnapshots map[string]core.PlanUpdate
1927 if !args.NoSess && ag != nil {
1928 var sessErr error
1929 sess, sessErr = openOrCreateSession(ctx, args, r, ag, version)
1930 if sessErr != nil {
1931 return sessErr
1932 }
1933 sessBaselineMsgs = len(ag.Messages())
1934 if sess != nil {
1935 // Startup resume uses the same provider/model-aware preparation as
1936 // the interactive session picker. This matters for --continue,
1937 // --resume, and explicit --session paths whose latest meta row was
1938 // written by another provider/model.
1939 candidate, resumeErr := applySessionResume(sess, ag, r.Provider, r.Model,
1940 strings.TrimSpace(args.Provider) != "", strings.TrimSpace(args.Model) != "", buildAgentFor)
1941 if resumeErr != nil {
1942 return resumeErr
1943 }
1944 sess = candidate.session
1945 ag = candidate.agent
1946 sessBaselineMsgs = candidate.fullMessageCount
1947 initialPlanSnapshots = candidate.planSnapshots
1948 activeProvider = candidate.provider
1949 activeModel = candidate.model
1950 r.Provider = candidate.provider
1951 r.Model = candidate.model
1952 }
1953 if sess != nil && ag != nil {
1954 sessionTitlePending = sess.Meta.Parent != "" && sess.Title == "" && len(ag.Messages()) <= sess.Meta.ForkPoint
1955 }
1956 }
1957 announceSession(extMgr, sess)
1958 // Print the hint after the session close defer below and all terminal/TUI
1959 // cleanup defers. Close removes a fresh empty session, so only a session
1960 // that remains discoverable through the hinted command gets a hint.
1961 defer func() {
1962 if !iv.ExitedViaCtrlC() {
1963 return
1964 }
1965 persistMu.Lock()
1966 current := sess
1967 persistMu.Unlock()
1968 hasMessages := false
1969 if finalAg := iv.Agent(); finalAg != nil {
1970 hasMessages = finalAg.MessageCount() > 0
1971 }
1972 if resumeID := resumableSessionID(ZutHome(), current, hasMessages); resumeID != "" {
1973 fmt.Print(resumeSessionHint(resumeID))
1974 }
1975 }()
1976 defer func() {
1977 persistMu.Lock()
1978 defer persistMu.Unlock()
1979 runErr = joinSessionCloseError(runErr, sess)
1980 }()
1981
1982 // persistMessage is the per-message hook bound to the agent. It
1983 // appends each new transcript message to the live session as soon
1984 // as it lands, so a kill / closed terminal / OS crash costs at
1985 // most the in-flight turn instead of the whole session. The
1986 // baseline counter advances in lock-step so the exit-time flush
1987 // doesn't double-write rows already on disk.
1988 persistMessage := func(m provider.Message) {
1989 sessionTransitionMu.RLock()
1990 defer sessionTransitionMu.RUnlock()
1991 persistMu.Lock()
1992 defer persistMu.Unlock()
1993 if sess == nil {
1994 return
1995 }
1996 if err := sess.AppendMessage(m); err == nil {
1997 sessBaselineMsgs++
1998 }
1999 }
2000 persistUsage := func(cum provider.Usage) {
2001 sessionTransitionMu.RLock()
2002 defer sessionTransitionMu.RUnlock()
2003 persistMu.Lock()
2004 defer persistMu.Unlock()
2005 if sess == nil {
2006 return
2007 }
2008 _ = sess.AppendUsage(cum, cum)
2009 }
2010 persistRetryLifecycle := func(record core.RetryLifecycleRecord) {
2011 sessionTransitionMu.RLock()
2012 defer sessionTransitionMu.RUnlock()
2013 persistMu.Lock()
2014 defer persistMu.Unlock()
2015 if sess != nil {
2016 sess.RecordRetryLifecycle(record)
2017 }
2018 }
2019 persistCompaction := func(messages []provider.Message) {
2020 sessionTransitionMu.RLock()
2021 var session *extproto.SessionContext
2022 var states map[string]json.RawMessage
2023 persistMu.Lock()
2024 if sess != nil {
2025 if err := sess.AppendCompaction(messages); err == nil {
2026 sessBaselineMsgs = len(messages)
2027 session = sessionContext(sess)
2028 states = copyExtensionStates(sess.ExtensionState)
2029 }
2030 }
2031 persistMu.Unlock()
2032 sessionTransitionMu.RUnlock()
2033 if session != nil {
2034 extMgr.EmitSessionEvent("session_compacted", session, states)
2035 }
2036 }
2037 persistCompactHandoff := func(state json.RawMessage) error {
2038 sessionTransitionMu.RLock()
2039 defer sessionTransitionMu.RUnlock()
2040 persistMu.Lock()
2041 defer persistMu.Unlock()
2042 if sess == nil {
2043 return nil
2044 }
2045 return sess.UpdateCompactHandoff(state)
2046 }
2047 currentCompactHandoff := func() json.RawMessage {
2048 persistMu.Lock()
2049 defer persistMu.Unlock()
2050 if sess == nil {
2051 return nil
2052 }
2053 return append(json.RawMessage(nil), sess.Meta.CompactHandoff...)
2054 }
2055 persistGoal := func(goal *core.SessionGoal) error {
2056 sessionTransitionMu.RLock()
2057 defer sessionTransitionMu.RUnlock()
2058 persistMu.Lock()
2059 defer persistMu.Unlock()
2060 if sess == nil {
2061 return errors.New("session persistence is disabled")
2062 }
2063 return sess.UpdateGoal(goal)
2064 }
2065 persistGoalRuntime := func(goal *core.SessionGoal) error {
2066 sessionTransitionMu.RLock()
2067 defer sessionTransitionMu.RUnlock()
2068 persistMu.Lock()
2069 defer persistMu.Unlock()
2070 if sess == nil {
2071 return errors.New("session persistence is disabled")
2072 }
2073 return sess.UpdateGoalRuntime(goal)
2074 }
2075 ensureMission := func(objective string) error {
2076 sessionTransitionMu.RLock()
2077 defer sessionTransitionMu.RUnlock()
2078 persistMu.Lock()
2079 defer persistMu.Unlock()
2080 if sess == nil {
2081 return errors.New("session persistence is disabled")
2082 }
2083 return sess.EnsureMission(objective, core.MissionSourceUser)
2084 }
2085 currentGoal := func() *core.SessionGoal {
2086 persistMu.Lock()
2087 defer persistMu.Unlock()
2088 if sess == nil || sess.Meta.Goal == nil {
2089 return nil
2090 }
2091 goal := *sess.Meta.Goal
2092 return &goal
2093 }
2094 currentGoalHistory := func() []core.SessionGoal {
2095 persistMu.Lock()
2096 defer persistMu.Unlock()
2097 if sess == nil {
2098 return nil
2099 }
2100 return append([]core.SessionGoal(nil), sess.Meta.GoalHistory...)
2101 }
2102 currentPlan := func() []core.PlanStep {
2103 return liveInteractiveAgent(iv, ag).CurrentPlan()
2104 }
2105 persistedPlan := func() *core.SessionPlan {
2106 persistMu.Lock()
2107 defer persistMu.Unlock()
2108 if sess == nil || sess.Meta.Plan == nil {
2109 return nil
2110 }
2111 plan := *sess.Meta.Plan
2112 plan.Steps = append([]core.PlanStep(nil), sess.Meta.Plan.Steps...)
2113 return &plan
2114 }
2115 persistPlan := func(plan *core.SessionPlan) error {
2116 sessionTransitionMu.RLock()
2117 defer sessionTransitionMu.RUnlock()
2118 persistMu.Lock()
2119 defer persistMu.Unlock()
2120 if sess == nil {
2121 return errors.New("session persistence is disabled")
2122 }
2123 return sess.UpdatePlan(plan)
2124 }
2125 bindAgentToolResultSession := func(a *core.Agent, boundSession *core.Session) {
2126 if a == nil {
2127 return
2128 }
2129 a.CommitToolResult = func(_ string, result core.ToolResult) error {
2130 persistMu.Lock()
2131 defer persistMu.Unlock()
2132 return persistToolResultState(extMgr, boundSession, result, initialCfg.Goals.MaxTokenBudget)
2133 }
2134 }
2135 wireAgentPersist := func(a *core.Agent) *core.Agent {
2136 if a == nil {
2137 return a
2138 }
2139 persistMu.Lock()
2140 currentSession := sess
2141 persistMu.Unlock()
2142 if currentSession != nil {
2143 a.SetSessionTimeContext(currentSession.Meta.Started, currentSession.Meta.Timezone, currentSession.Meta.TimezoneOffset)
2144 }
2145 a.OnMessageAppended = persistMessage
2146 a.OnUsage = persistUsage
2147 a.OnRetryLifecycle = persistRetryLifecycle
2148 a.OnTranscriptCompacted = persistCompaction
2149 bindAgentToolResultSession(a, currentSession)
2150 return a
2151 }
2152 wireAgentPersist(ag)
2153 defer func() {
2154 closeAgentLSP(liveInteractiveAgent(iv, ag))
2155 closeResolvedLSP(r)
2156 }()
2157
2158 // Re-wrap the build closures so any agent constructed by the TUI
2159 // (login, /model swap to a different provider) also gets the
2160 // persistence hooks. Without this, switching provider would
2161 // silently revert to the old in-memory-only behaviour. Selection state
2162 // is published by the successful transition itself, not by preparation.
2163 baseBuildAgent := buildAgent
2164 buildAgent = func() (*core.Agent, string, string, error) {
2165 a, p, m, err := baseBuildAgent()
2166 return wireAgentPersist(a), p, m, err
2167 }
2168 baseBuildAgentFor := buildAgentFor
2169 buildAgentFor = func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
2170 a, p, m, err := baseBuildAgentFor(providerOverride, modelOverride)
2171 return wireAgentPersist(a), p, m, err
2172 }
2173 baseBuildAgentForRescue := buildAgentForRescue
2174 buildAgentForRescue = func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
2175 a, p, m, err := baseBuildAgentForRescue(providerOverride, modelOverride)
2176 return wireAgentPersist(a), p, m, err
2177 }
2178
2179 // loadSession replaces the current session with the one at path and
2180 // hands its messages to the agent. Used by the /sessions picker.
2181 loadSessionContext := func(loadCtx context.Context, path string) (loadErr error) {
2182 if err := loadCtx.Err(); err != nil {
2183 return err
2184 }
2185 selectedMeta, err := core.ManagedSessionMeta(loadCtx, agentSessionsRoot(ZutHome(), args), path)
2186 if err != nil {
2187 return fmt.Errorf("validate selected session: %w", err)
2188 }
2189 if info, statErr := os.Stat(selectedMeta.CWD); statErr != nil || !info.IsDir() {
2190 if statErr != nil {
2191 return fmt.Errorf("selected session cwd: %w", statErr)
2192 }
2193 return fmt.Errorf("selected session cwd is not a directory: %s", selectedMeta.CWD)
2194 }
2195 // Hold the transition lock from the pre-flush through the commit.
2196 // Persistence callbacks take the read side, so an active session
2197 // cannot be snapshotted before its lazy writes land or overwritten by
2198 // a callback while the candidate is being installed.
2199 if err := loadCtx.Err(); err != nil {
2200 return err
2201 }
2202 sessionTransitionMu.Lock()
2203 defer sessionTransitionMu.Unlock()
2204 if err := loadCtx.Err(); err != nil {
2205 return err
2206 }
2207 workspaceChanged := filepath.Clean(selectedMeta.CWD) != filepath.Clean(args.CWD)
2208
2209 currentAg := liveInteractiveAgent(iv, ag)
2210 if currentAg == nil {
2211 return fmt.Errorf("no agent running; log in first")
2212 }
2213
2214 persistMu.Lock()
2215 currentProvider := activeProvider
2216 currentModel := activeModel
2217 oldSess := sess
2218 // Flush before reading the candidate. Use the locked form rather
2219 // than the public callback, which would acquire the read lock held
2220 // by this transition.
2221 if oldSess != nil {
2222 next, flushErr := writeNewTranscriptLocked(currentAg, oldSess, sessBaselineMsgs)
2223 sessBaselineMsgs = next
2224 if flushErr != nil {
2225 persistMu.Unlock()
2226 return fmt.Errorf("flush current session: %w", flushErr)
2227 }
2228 }
2229 currentMessageCount := len(currentAg.Messages())
2230 currentCost := currentAg.Cost()
2231 persistMu.Unlock()
2232
2233 // A candidate build must not publish its provider/model as the live
2234 // selection before the candidate commits. The builder also stages
2235 // provider settings on the shared runtime, so restore those settings on
2236 // every failed path, including errors returned during preparation.
2237 runtimeConfig := runtime.snapshotConfiguration()
2238 oldCWD := args.CWD
2239 oldResolvedCWD := r.CWD
2240 oldPermissionSet := args.PermissionSet
2241 oldSandboxRoot := ""
2242 oldSandboxLocked := false
2243 if sharedSandbox != nil {
2244 oldSandboxRoot = sharedSandbox.Root
2245 oldSandboxLocked = sharedSandbox.Locked()
2246 }
2247 rollbackWorkspace := func() {
2248 if !workspaceChanged {
2249 return
2250 }
2251 args.CWD = oldCWD
2252 r.CWD = oldResolvedCWD
2253 args.PermissionSet = oldPermissionSet
2254 runtime.SetRepoRoot(oldResolvedCWD)
2255 if sharedSandbox != nil {
2256 sharedSandbox.Root = oldSandboxRoot
2257 if oldSandboxLocked {
2258 sharedSandbox.Lock()
2259 } else {
2260 sharedSandbox.Unlock()
2261 }
2262 }
2263 }
2264 if workspaceChanged {
2265 args.CWD = selectedMeta.CWD
2266 r.CWD = selectedMeta.CWD
2267 runtime.SetRepoRoot(selectedMeta.CWD)
2268 if args.PermissionSet != nil {
2269 expanded := args.PermissionSet.Expand(selectedMeta.CWD, args.AgentDataDir)
2270 args.PermissionSet = &expanded
2271 }
2272 if sharedSandbox != nil {
2273 sharedSandbox.Root = selectedMeta.CWD
2274 if oldSandboxLocked {
2275 sharedSandbox.Lock()
2276 } else {
2277 sharedSandbox.Unlock()
2278 }
2279 }
2280 }
2281 committed := false
2282 var candidate sessionResumeCandidate
2283 defer func() {
2284 if !committed {
2285 rollbackWorkspace()
2286 runtime.restoreConfiguration(runtimeConfig)
2287 loadErr = joinSessionCloseError(loadErr, candidate.session)
2288 }
2289 }()
2290 if workspaceChanged {
2291 candidate, err = prepareSessionResumeForWorkspace(path, currentAg, currentProvider, currentModel, baseBuildAgentFor)
2292 } else {
2293 candidate, err = prepareSessionResume(path, currentAg, currentProvider, currentModel, baseBuildAgentFor)
2294 }
2295 if err != nil {
2296 // prepareSessionResume closes its append handle on failure;
2297 // no live agent or session has been changed.
2298 return err
2299 }
2300
2301 // Wire the private candidate before it can become visible. This is
2302 // also required for legacy same-provider resumes, where the current
2303 // agent is reused and only its transcript/usage are refreshed.
2304 wireAgentPersist(candidate.agent)
2305
2306 if err := loadCtx.Err(); err != nil {
2307 return err
2308 }
2309 persistMu.Lock()
2310 // A provider rebuild ran outside persistMu. Refuse to install it if
2311 // the live agent, session, selection, transcript, or cost changed in
2312 // the meantime; otherwise a slow resume could discard a newer turn or
2313 // model swap.
2314 live := liveInteractiveAgent(iv, ag)
2315 changed := sess != oldSess || activeProvider != currentProvider || activeModel != currentModel || live != currentAg
2316 if !changed && live != nil {
2317 changed = len(live.Messages()) != currentMessageCount || live.Cost() != currentCost
2318 }
2319 if changed {
2320 persistMu.Unlock()
2321 return fmt.Errorf("session changed while loading; please try again")
2322 }
2323 newStates := copyExtensionStates(candidate.session.ExtensionState)
2324 var oldCloseErr error
2325 if oldSess != nil {
2326 oldCloseErr = oldSess.Close()
2327 }
2328 sess = candidate.session
2329 bindAgentToolResultSession(candidate.agent, candidate.session)
2330 // Seed core plan state from the loaded session before the swap publishes
2331 // the agent; see applySessionResume for why this is required on resume.
2332 candidate.agent.SetPlan(candidate.session.Meta.PlanSteps())
2333 candidate.agent.SetSessionTimeContext(candidate.session.Meta.Started, candidate.session.Meta.Timezone, candidate.session.Meta.TimezoneOffset)
2334 sessionTitlePending = candidate.session != nil && candidate.session.Meta.Parent != "" && candidate.session.Title == "" && candidate.fullMessageCount <= candidate.session.Meta.ForkPoint
2335 // The live agent only receives a compact resume window, but the
2336 // session file remains intact. Keep the persistence baseline at
2337 // the original on-disk message count so future turns append after
2338 // the full session instead of duplicating the hydrated tail.
2339 sessBaselineMsgs = candidate.fullMessageCount
2340
2341 if candidate.rebuilt {
2342 // Commit the TUI agent while persistMu still protects the session
2343 // writer, so no new message can land on the old file between the
2344 // two state changes.
2345 if iv != nil {
2346 if workspaceChanged {
2347 iv.ApplySessionAgentWithCWD(candidate.agent, candidate.provider, candidate.model, selectedMeta.CWD, candidate.session.Meta.CompactHandoff)
2348 } else {
2349 iv.ApplySessionAgentWithCompactHandoff(candidate.agent, candidate.provider, candidate.model, candidate.session.Meta.CompactHandoff)
2350 }
2351 }
2352 ag = candidate.agent
2353 } else {
2354 currentAg.SetMessages(candidate.messages)
2355 currentAg.SeedCost(candidate.cumulative)
2356 currentAg.SeedLastTurnUsage(candidate.lastTurn)
2357 ag = currentAg
2358 }
2359 activeProvider = candidate.provider
2360 activeModel = candidate.model
2361 if candidate.session != nil {
2362 // Keep the resident parent's session association in the same commit
2363 // as the session, agent, usage, and persistence baseline.
2364 runtime.SetActiveSession(candidate.session.ID)
2365 if iv != nil {
2366 iv.SetSubagentSessionScope(candidate.session.ID)
2367 }
2368 }
2369 committed = true
2370 persistMu.Unlock()
2371 if iv != nil {
2372 iv.RefreshGoal()
2373 iv.RefreshPlan(candidate.planSnapshots)
2374 }
2375 if candidate.session.Meta.Parent != "" {
2376 extMgr.EmitSessionEvent("session_forked", sessionContext(candidate.session), newStates)
2377 }
2378 extMgr.EmitSessionEvent("session_switched", sessionContext(candidate.session), newStates)
2379 if oldCloseErr != nil {
2380 return fmt.Errorf("close current session: %w", oldCloseErr)
2381 }
2382 return nil
2383 }
2384 loadSession := func(path string) error {
2385 return loadSessionContext(context.Background(), path)
2386 }
2387
2388 // changeCWD switches the running session to a new working directory.
2389 // Wired into InteractiveConfig.ChangeCWD and invoked by the hidden
2390 // /cd slash command (which itself is only fired by the workspaces
2391 // extension's panel-key Enter handler today; the user can type /cd
2392 // directly but it's not in autocomplete / help / the README).
2393 //
2394 // Steps, in order:
2395 // 1. resolve + validate the new path (~ expansion, abs/rel)
2396 // 2. stage the candidate cwd, sandbox, and subagent state
2397 // 3. rebuild the agent and allocate its new session
2398 // 4. commit all new state together, closing the old session last
2399 // 5. push the committed state into the running Interactive
2400 //
2401 // The /jail state is preserved verbatim: if the sandbox was locked
2402 // to the old cwd, it stays locked, just re-pointed at the new one.
2403 changeCWD := func(path string) error {
2404 sessionTransitionMu.Lock()
2405 defer sessionTransitionMu.Unlock()
2406 if path == "" {
2407 return fmt.Errorf("empty path")
2408 }
2409 // ~ expansion.
2410 if path == "~" || strings.HasPrefix(path, "~/") {
2411 home, herr := os.UserHomeDir()
2412 if herr != nil || home == "" {
2413 return fmt.Errorf("cannot expand ~: %v", herr)
2414 }
2415 if path == "~" {
2416 path = home
2417 } else {
2418 path = filepath.Join(home, path[2:])
2419 }
2420 }
2421 if !filepath.IsAbs(path) {
2422 path = filepath.Join(args.CWD, path)
2423 }
2424 absPath, err := filepath.Abs(path)
2425 if err != nil {
2426 return err
2427 }
2428 info, err := os.Stat(absPath)
2429 if err != nil {
2430 return err
2431 }
2432 if !info.IsDir() {
2433 return fmt.Errorf("not a directory: %s", absPath)
2434 }
2435
2436 currentAg := liveInteractiveAgent(iv, ag)
2437 if currentAg == nil {
2438 return fmt.Errorf("no agent running; log in first")
2439 }
2440
2441 // Stage the candidate state while retaining a complete rollback
2442 // snapshot. A failed rebuild or session allocation must leave the
2443 // current agent, session, sandbox, and subagent root usable.
2444 oldCWD := args.CWD
2445 oldResolvedCWD := r.CWD
2446 oldPermissionSet := args.PermissionSet
2447 persistMu.Lock()
2448 oldActiveProvider := activeProvider
2449 oldActiveModel := activeModel
2450 persistMu.Unlock()
2451 runtimeConfig := runtime.snapshotConfiguration()
2452 oldSandboxRoot := ""
2453 oldSandboxLocked := false
2454 if sharedSandbox != nil {
2455 oldSandboxRoot = sharedSandbox.Root
2456 oldSandboxLocked = sharedSandbox.Locked()
2457 }
2458 rollback := func() {
2459 args.CWD = oldCWD
2460 r.CWD = oldResolvedCWD
2461 args.PermissionSet = oldPermissionSet
2462 persistMu.Lock()
2463 activeProvider = oldActiveProvider
2464 activeModel = oldActiveModel
2465 persistMu.Unlock()
2466 runtime.restoreConfiguration(runtimeConfig)
2467 if sharedSandbox != nil {
2468 sharedSandbox.Root = oldSandboxRoot
2469 if oldSandboxLocked {
2470 sharedSandbox.Lock()
2471 } else {
2472 sharedSandbox.Unlock()
2473 }
2474 }
2475 }
2476
2477 args.CWD = absPath
2478 r.CWD = absPath
2479 runtime.SetRepoRoot(absPath)
2480 if args.PermissionSet != nil {
2481 expanded := args.PermissionSet.Expand(absPath, args.AgentDataDir)
2482 args.PermissionSet = &expanded
2483 }
2484 if sharedSandbox != nil {
2485 sharedSandbox.Root = absPath
2486 if oldSandboxLocked {
2487 sharedSandbox.Lock()
2488 } else {
2489 sharedSandbox.Unlock()
2490 }
2491 }
2492
2493 // Rebuild the agent so tools / AGENTS.md / system prompt
2494 // re-bind to the new cwd. buildAgent() reads from args + r.
2495 newAg, newProvider, newModel, berr := buildAgent()
2496 if berr != nil {
2497 rollback()
2498 return fmt.Errorf("rebuild agent: %w", berr)
2499 }
2500
2501 // Fresh session in the new cwd's bucket. We bypass
2502 // openOrCreateSession's --continue / --resume branches
2503 // because /cd's semantics are "start fresh here", matching
2504 // what relaunching `zut --cwd <path>` would do today.
2505 var newSess *core.Session
2506 if !args.NoSess {
2507 newRoot := agentSessionsRoot(ZutHome(), args)
2508 core.PruneEmptySessions(newRoot, absPath)
2509 var serr error
2510 newSess, serr = core.NewSession(newRoot, absPath, newProvider, newModel, version)
2511 if serr != nil {
2512 rollback()
2513 return fmt.Errorf("open session in %s: %w", absPath, serr)
2514 }
2515 }
2516
2517 // Invalidate any title request before swapping the host-owned session
2518 // pointer. The interactive state reset below happens after the swap,
2519 // so this guard closes the window where a late result could otherwise
2520 // be written to the new session.
2521 if iv != nil {
2522 iv.CancelPendingSessionTitle()
2523 }
2524
2525 // Commit only after every fallible operation has succeeded. Close
2526 // the old session last so rollback never has to resurrect it.
2527 var newStates map[string]json.RawMessage
2528 var oldCloseErr error
2529 persistMu.Lock()
2530 if sess != nil {
2531 next, flushErr := writeNewTranscriptLocked(currentAg, sess, sessBaselineMsgs)
2532 sessBaselineMsgs = next
2533 if flushErr != nil {
2534 persistMu.Unlock()
2535 rollbackErr := joinSessionCloseError(fmt.Errorf("flush current session: %w", flushErr), newSess)
2536 rollback()
2537 return rollbackErr
2538 }
2539 oldCloseErr = sess.Close()
2540 }
2541 sess = newSess
2542 bindAgentToolResultSession(newAg, newSess)
2543 if newSess != nil {
2544 newAg.SetSessionTimeContext(newSess.Meta.Started, newSess.Meta.Timezone, newSess.Meta.TimezoneOffset)
2545 newStates = copyExtensionStates(newSess.ExtensionState)
2546 }
2547 sessBaselineMsgs = 0
2548 sessionTitlePending = false
2549 activeProvider = newProvider
2550 activeModel = newModel
2551 persistMu.Unlock()
2552 ag = newAg
2553 closeAgentLSP(currentAg)
2554
2555 // Push the new state into the running Interactive.
2556 if iv != nil {
2557 startupPaths := instructionContextPaths(loadAgentsContext(absPath, ZutHome()))
2558 iv.ApplyChangedCWDWithStartupContext(newAg, newProvider, newModel, absPath, startupPaths)
2559 iv.RefreshGoal()
2560 // A new cwd starts a fresh session with no plan; reset the counters
2561 // and snapshot map so the previous workspace's checklist is gone.
2562 iv.RefreshPlan(nil)
2563 }
2564
2565 // Re-scope the subagent dashboard to the new session.
2566 if newSess != nil {
2567 runtime.SetActiveSession(newSess.ID)
2568 if iv != nil {
2569 iv.SetSubagentSessionScope(newSess.ID)
2570 }
2571 }
2572 if newSess != nil {
2573 extMgr.EmitSessionEvent("session_opened", sessionContext(newSess), newStates)
2574 }
2575 if oldCloseErr != nil {
2576 return fmt.Errorf("close current session: %w", oldCloseErr)
2577 }
2578 return nil
2579 }
2580
2581 devBuild := isDevVersion(version)
2582 if devBuild {
2583 fmt.Fprintln(os.Stderr, "zut:", devVersionNotice)
2584 }
2585 term := tui.NewProcTerm()
2586
2587 var updateCh chan modes.UpdateInfo
2588 var changelogCh chan modes.ChangelogPayload
2589 if !devBuild {
2590 // Kick off the async update check so the banner can appear when the
2591 // http response eventually arrives (usually <1s on cached DNS). Map
2592 // agent.UpdateInfo -> modes.UpdateInfo here to avoid a cyclic import.
2593 updateCh = make(chan modes.UpdateInfo, 1)
2594 go func() {
2595 defer close(updateCh)
2596 src := <-CheckForUpdateAsync(ZutHome(), version)
2597 updateCh <- modes.UpdateInfo{
2598 Current: src.Current,
2599 Latest: src.Latest,
2600 Available: src.Available,
2601 URL: src.URL,
2602 }
2603 }()
2604
2605 // Changelog: when the running version differs from the last
2606 // version whose release notes the user dismissed, fetch the
2607 // release body from GitHub and have the TUI show it once. On
2608 // first-ever launch (no prior LastChangelogShown), seed the
2609 // stored version silently — don't dump release notes at someone
2610 // who just installed.
2611 changelogCh = make(chan modes.ChangelogPayload, 1)
2612 go func() {
2613 defer close(changelogCh)
2614 cfg, _ := LoadConfig()
2615 if cfg.LastChangelogShown == "" {
2616 SeedChangelogVersion(version)
2617 return
2618 }
2619 if !ShouldShowChangelog(version, cfg) {
2620 return
2621 }
2622 info := <-FetchChangelogAsync(version)
2623 if info.Body == "" {
2624 return
2625 }
2626 changelogCh <- modes.ChangelogPayload{
2627 Version: info.Version,
2628 Body: info.Body,
2629 URL: info.URL,
2630 }
2631 }()
2632 }
2633
2634 fastMode := r.FastMode
2635 quickModelShortcuts := interactiveQuickModelShortcuts(initialCfg.QuickModelShortcuts)
2636 themeEnv := strings.ToLower(strings.TrimSpace(os.Getenv("ZUT_THEME")))
2637 if themeEnv != "" && themeEnv != "auto" && themeEnv != "dark" && themeEnv != "light" {
2638 fmt.Fprintf(os.Stderr, "theme override: unsupported ZUT_THEME=%q; ignoring it\n", themeEnv)
2639 themeEnv = ""
2640 }
2641 themePreference := tui.ResolveThemePreference(initialCfg.Theme, themeEnv)
2642 theme, _, themeErr := tui.DetectThemeWithCustom(ZutHome(), themePreference.Effective, 80*time.Millisecond)
2643 if themeErr != nil {
2644 fmt.Fprintln(os.Stderr, "theme load:", themeErr)
2645 if !themePreference.Forced {
2646 themePreference = tui.ResolveThemePreference("", themeEnv)
2647 if initialCfg.Theme != "" {
2648 initialCfg.Theme = ""
2649 if err := SaveConfig(initialCfg); err != nil {
2650 fmt.Fprintln(os.Stderr, "theme reset:", err)
2651 }
2652 }
2653 }
2654 }
2655
2656 // Scope the dashboard to the active host session. The runtime owns
2657 // shutdown separately and closes the resident runtime exactly once.
2658 if sess != nil {
2659 runtime.SetActiveSession(sess.ID)
2660 }
2661
2662 var startupSkills []*skills.Skill
2663 if r.SkillTool != nil {
2664 startupSkills = r.SkillTool.Skills()
2665 }
2666 homeDir, _ := os.UserHomeDir()
2667 discoveredSubagents, _ := subagents.Discover(r.CWD, homeDir)
2668 subagentsAddendum := subagents.SystemPromptAddendum(discoveredSubagents)
2669 autoSubagentsToolAllowedForSession := autoSubagentsToolAllowed(args)
2670 autoSubagentsStatusToolAllowedForSession := autoSubagentsStatusToolAllowed(args)
2671 autoSubagentsStopToolAllowedForSession := autoSubagentsStopToolAllowed(args)
2672 autoSubagentsResumeToolAllowedForSession := autoSubagentsResumeToolAllowed(args)
2673 webSearchToolAllowedForInvocation := webSearchToolAllowedForSession(args)
2674 webSearchInvocationOverride := webSearchExplicitlyEnabledForSession(args)
2675 setWebSearchAvailable := func(available bool) {
2676 webSearchGuard.setAvailable(available)
2677 policy := subagents.WebSearchDeny
2678 if available {
2679 policy = subagents.WebSearchAllow
2680 }
2681 runtime.SetWebSearchPolicy(policy)
2682 }
2683
2684 iv = modes.NewInteractive(modes.InteractiveConfig{
2685 Terminal: term,
2686 Theme: theme,
2687 InlineImagesEnabled: initialCfg.InlineImagesEnabled,
2688 TerminalAlertsEnabled: initialCfg.TerminalAlertsEnabled,
2689 TerminalTitleEnabled: initialCfg.TerminalTitleEnabled,
2690 AutoSubagentsEnabled: initialCfg.AutoSubagentsEnabled,
2691 PonytailEnabled: initialCfg.PonytailEnabled,
2692 WebSearchEnabled: initialCfg.WebSearchEnabled,
2693 WebSearchToolAllowed: &webSearchToolAllowedForInvocation,
2694 WebSearchInvocationOverride: webSearchInvocationOverride,
2695 AutoSubagentsToolAllowed: &autoSubagentsToolAllowedForSession,
2696 AutoSubagentsStatusToolAllowed: &autoSubagentsStatusToolAllowedForSession,
2697 AutoSubagentsStopToolAllowed: &autoSubagentsStopToolAllowedForSession,
2698 AutoSubagentsResumeToolAllowed: &autoSubagentsResumeToolAllowedForSession,
2699 FastMode: &fastMode,
2700 LSPEnabled: initialCfg.LSPEnabled,
2701 SubagentLSPEnabled: initialCfg.SubagentLSPEnabled,
2702 AutoCompactThreshold: initialCfg.AutoCompactThreshold,
2703 GoalMaxTokenBudget: initialCfg.Goals.MaxTokenBudget,
2704 JailByDefault: initialCfg.JailByDefault,
2705 QuickModelShortcuts: quickModelShortcuts,
2706 ActiveModelProfile: initialCfg.ActiveModelProfile,
2707 RecursiveFileSuggest: initialCfg.RecursiveFileSuggest,
2708 RespectGitignore: initialCfg.RespectGitignore,
2709 CompactMode: initialCfg.CompactMode,
2710 TUIInputStyle: initialCfg.TUIInputStyle,
2711 TUIStatusPosition: initialCfg.TUIStatusPosition,
2712 TUIWorkingPosition: initialCfg.TUIWorkingPosition,
2713 ThemeName: initialCfg.Theme,
2714 EffectiveThemeName: themePreference.Effective,
2715 ThemeForced: themePreference.Forced,
2716 TerminalProfile: theme.Terminal,
2717 FlatTools: initialCfg.FlatToolRender(),
2718 CompactUser: initialCfg.CompactUserInput(),
2719 ExtensionThemes: extMgr.ThemeOptions,
2720 AutoSubagentsSystemAddendum: ProactiveSubagentsSystemAddendumFor(
2721 autoSubagentsToolAllowedForSession,
2722 autoSubagentsStopToolAllowedForSession,
2723 autoSubagentsResumeToolAllowedForSession,
2724 ),
2725 OnDemandSubagentsSystemAddendum: OnDemandSubagentsSystemAddendum,
2726 SubagentsSystemAddendum: subagentsAddendum,
2727 SettingsStore: configSettingsStore{},
2728 Model: r.Model,
2729 Provider: r.Provider,
2730 AuthMethod: r.AuthMethod,
2731 BaseURL: r.BaseURL,
2732 Reasoning: r.Reasoning,
2733 OnReasoningChanged: runtime.SetReasoning,
2734 OnFastModeChanged: runtime.SetFastMode,
2735 SystemPrompt: r.SystemPrompt,
2736 WritingGuidance: WritingGuidance(),
2737 Tools: r.ToolRegistry,
2738 MaxSteps: r.MaxSteps,
2739 CWD: r.CWD,
2740 StartupAgentName: args.AgentName,
2741 StartupContextPaths: instructionContextPaths(r.ContextFiles),
2742 StartupExtensionNames: startupExtensionNames(extMgr.All()),
2743 StartupExtensionErrors: startupExtensionErrors,
2744 StartupSkillNames: startupSkillNames(startupSkills),
2745 ShowInstructionsAtStartup: initialCfg.ShowInstructionsAtStartup,
2746 ZutHome: ZutHome(),
2747 SessionsRoot: agentSessionsRoot(ZutHome(), args),
2748 SessionsDisabled: args.NoSess,
2749 Version: version,
2750 UpdateInfoChan: updateCh,
2751 Sandbox: sharedSandbox,
2752 Agent: ag,
2753 InitialCompactHandoff: currentCompactHandoff(),
2754 InitialSessionTitle: func() string {
2755 if sess == nil || sessionTitlePending {
2756 return ""
2757 }
2758 return sess.Title
2759 }(),
2760 InitialSessionTitlePending: sessionTitlePending,
2761 InitialInput: args.Prompt,
2762 StartupPre: args.StartupPre,
2763 OnStartupPreDone: func() {
2764 // entry.pre often installs skills/extensions; rediscover them
2765 // before the user starts a model turn.
2766 current := liveInteractiveAgent(iv, ag)
2767 if extMgr != nil {
2768 _ = extMgr.Reload(context.Background(), 2*time.Second)
2769 }
2770 if current != nil {
2771 if _, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistryWithScheduler, iv); err != nil {
2772 iv.ReportError(err)
2773 }
2774 }
2775 },
2776 RefreshTools: func() error {
2777 current := liveInteractiveAgent(iv, ag)
2778 webSearchPolicy, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistryWithScheduler, iv)
2779 if err != nil {
2780 if !errors.Is(err, errInteractiveAgentChanged) {
2781 setWebSearchAvailable(false)
2782 }
2783 return err
2784 }
2785 setWebSearchAvailable(webSearchPolicy == subagents.WebSearchAllow)
2786 return nil
2787 },
2788 SetWebSearchAvailable: setWebSearchAvailable,
2789 RefreshPrompt: func() error {
2790 current := liveInteractiveAgent(iv, ag)
2791 webSearchPolicy, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistryWithScheduler, iv)
2792 if err != nil {
2793 return err
2794 }
2795 setWebSearchAvailable(webSearchPolicy == subagents.WebSearchAllow)
2796 return nil
2797 },
2798 AuthManager: mgr,
2799 LlamaCPPConfig: ResolveLlamaCPPConfig,
2800 RefreshLlamaCPPModels: RefreshLlamaCPPModels,
2801 BuildAgent: buildAgent,
2802 SetKimiCLIFallbackDisabled: SetKimiCLIFallbackDisabled,
2803 BuildAgentFor: buildAgentFor,
2804 BuildAgentForRescue: buildAgentForRescue,
2805 LoggedInProviders: func() []string {
2806 var out []string
2807 seen := map[string]bool{}
2808 for _, p := range knownProviders {
2809 if CredentialAvailable(p) && !seen[p] {
2810 out = append(out, p)
2811 seen[p] = true
2812 }
2813 }
2814 // Include custom providers that have credentials stored.
2815 for p := range provider.CustomProviders() {
2816 if CredentialAvailable(p) && !seen[p] {
2817 out = append(out, p)
2818 seen[p] = true
2819 }
2820 }
2821 // Ollama models are always available (no auth needed).
2822 if !seen["ollama"] {
2823 out = append(out, "ollama")
2824 }
2825 return out
2826 },
2827 LoadSession: loadSession,
2828 LoadSessionContext: loadSessionContext,
2829 ChangeCWD: changeCWD,
2830 PersistCompactHandoff: persistCompactHandoff,
2831 CurrentCompactHandoff: currentCompactHandoff,
2832 PersistGoal: persistGoal,
2833 PersistGoalRuntime: persistGoalRuntime,
2834 CurrentGoal: currentGoal,
2835 CurrentGoalHistory: currentGoalHistory,
2836 CurrentPlan: currentPlan,
2837 PersistPlan: persistPlan,
2838 PersistedPlan: persistedPlan,
2839 InitialPlanSnapshots: initialPlanSnapshots,
2840 EnsureMission: ensureMission,
2841 CurrentSessionPath: func() string {
2842 persistMu.Lock()
2843 defer persistMu.Unlock()
2844 if sess == nil {
2845 return ""
2846 }
2847 return sess.Path
2848 },
2849 FlushSession: func() {
2850 sessionTransitionMu.RLock()
2851 defer sessionTransitionMu.RUnlock()
2852 // Append any not-yet-persisted agent messages to the
2853 // current session file, then advance the baseline so
2854 // the final WriteNewTranscript at exit doesn't write
2855 // duplicates. Per-message persistence keeps the on-
2856 // disk file current already, so this is mostly a
2857 // defensive flush — still needed for /session export
2858 // to guarantee the exported bytes include the very
2859 // last in-flight turn.
2860 currentAg := iv.Agent()
2861 if currentAg == nil {
2862 return
2863 }
2864 persistMu.Lock()
2865 defer persistMu.Unlock()
2866 if sess == nil {
2867 return
2868 }
2869 next, flushErr := writeNewTranscriptLocked(currentAg, sess, sessBaselineMsgs)
2870 sessBaselineMsgs = next
2871 if flushErr != nil {
2872 iv.ReportError(fmt.Errorf("flush session: %w", flushErr))
2873 return
2874 }
2875 },
2876 SessionTransition: newSessionTransition(&sessionTransitionMu),
2877 Extensions: extMgr,
2878 ResidentManager: runtime.ResidentManager(),
2879 SpawnResident: func(ctx context.Context, request tools.ResidentSpawnRequest) (string, error) {
2880 manager := runtime.ResidentManager()
2881 if manager == nil {
2882 return "", errors.New("resident runtime is unavailable")
2883 }
2884 catalogue := r.ToolRegistry
2885 if iv != nil && iv.Agent() != nil {
2886 catalogue = iv.Agent().ToolsSnapshot()
2887 }
2888 spec, err := runtime.buildResidentChildSpec(ctx, request, catalogue)
2889 if err != nil {
2890 return "", err
2891 }
2892 if _, err := manager.Spawn(ctx, spec, request.Task); err != nil {
2893 return "", err
2894 }
2895 return spec.ID, nil
2896 },
2897 BuildResidentSpec: func(ctx context.Context, request tools.ResidentSpawnRequest) (subagents.ResidentChildSpec, error) {
2898 catalogue := r.ToolRegistry
2899 if iv != nil && iv.Agent() != nil {
2900 catalogue = iv.Agent().ToolsSnapshot()
2901 }
2902 return runtime.buildResidentChildSpec(ctx, request, catalogue)
2903 },
2904 ResolveSubagent: resolveSubagent,
2905 ChangelogChan: changelogCh,
2906 OnChangelogDismiss: func() {
2907 // For development builds, store the actual release version
2908 // so the same changelog doesn't show again next launch.
2909 // For real builds, store the binary version.
2910 v := version
2911 if devBuild {
2912 if iv != nil && iv.ChangelogVersion() != "" {
2913 v = iv.ChangelogVersion()
2914 }
2915 }
2916 _ = MarkChangelogShown(v)
2917 },
2918 SkillSnapshot: func() []*skills.Skill {
2919 if args.NoSkill {
2920 // --no-skill: nothing for the picker to show.
2921 return nil
2922 }
2923 // Re-discover so the picker reflects edits made during
2924 // the session. Cheap; SKILL.md files are small. Filter
2925 // out built-in skills — they're hidden from user-facing
2926 // surfaces because they're implementation detail; the
2927 // model still sees them through the system-prompt
2928 // manifest and the skill tool.
2929 userHome, _ := os.UserHomeDir()
2930 list, _ := skills.Discover(ZutHome(), r.CWD, userHome, args.WithSkills)
2931 list = mergeExtensionSkills(skills.NewTool(list), extMgr.Skills())
2932 return skills.VisibleSkills(list)
2933 },
2934 NoYolo: args.NoYolo,
2935 ConfirmGate: confirmGate,
2936 PersistModel: newPersistModelCallback(&persistMu, &sess, &activeProvider, &activeModel, func(message string) {
2937 if iv != nil {
2938 iv.Notify("session", "error", message)
2939 }
2940 }),
2941 CurrentSessionTitle: func() string {
2942 sessionTransitionMu.RLock()
2943 defer sessionTransitionMu.RUnlock()
2944 persistMu.Lock()
2945 defer persistMu.Unlock()
2946 if sess == nil || sessionTitlePending {
2947 return ""
2948 }
2949 return sess.Title
2950 },
2951 CurrentSessionTitlePending: func() bool {
2952 sessionTransitionMu.RLock()
2953 defer sessionTransitionMu.RUnlock()
2954 persistMu.Lock()
2955 defer persistMu.Unlock()
2956 return sessionTitlePending
2957 },
2958 PersistTitle: func(title string) error {
2959 persistMu.Lock()
2960 defer persistMu.Unlock()
2961 if sess == nil {
2962 return nil
2963 }
2964 if err := sess.UpdateTitle(title); err != nil {
2965 return err
2966 }
2967 sessionTitlePending = false
2968 return nil
2969 },
2970 OnSessionTitleChanged: func(title string) {
2971 sessionTransitionMu.RLock()
2972 defer sessionTransitionMu.RUnlock()
2973 persistMu.Lock()
2974 defer persistMu.Unlock()
2975 if sess != nil {
2976 sess.Title = title
2977 sessionTitlePending = false
2978 }
2979 },
2980 })
2981 extHooks.attachInteractive(iv)
2982 schedulerCtx, cancelScheduler := context.WithCancel(ctx)
2983 defer cancelScheduler()
2984 go func() {
2985 if err := scheduleEngine.Run(schedulerCtx, func(taskCtx context.Context, task scheduler.Task) error {
2986 unlockSession := lockScheduledSession(task.SessionID)
2987 defer unlockSession()
2988 // Keep a background session run mutually exclusive with /session
2989 // transitions. The active target uses Interactive's distinct-turn
2990 // ingress instead, so it never injects into an in-flight model loop.
2991 sessionTransitionMu.RLock()
2992 defer sessionTransitionMu.RUnlock()
2993 persistMu.Lock()
2994 activeTarget := sess != nil && sess.ID == task.SessionID
2995 persistMu.Unlock()
2996 if activeTarget {
2997 return iv.SubmitFollowUp(taskCtx, task.Message)
2998 }
2999 // A resumed background agent must schedule any follow-up work against
3000 // the transcript it resumed, not whichever session is visible in the
3001 // interactive TUI while it runs.
3002 backgroundRegistry := func(registry core.Registry) core.Registry {
3003 if schedulerAllowed {
3004 registry[tools.ScheduleToolName] = &tools.ScheduleTool{
3005 Engine: scheduleEngine,
3006 SessionID: func() string { return task.SessionID },
3007 Location: func() *time.Location { return time.Local },
3008 }
3009 }
3010 return registry
3011 }
3012 err := runScheduledSession(taskCtx, task, args, r, extMgr, backgroundRegistry)
3013 if err != nil {
3014 iv.Notify("scheduler", "error", fmt.Sprintf("scheduled task %s failed: %v", task.ID, err))
3015 } else {
3016 iv.Notify("scheduler", "success", fmt.Sprintf("scheduled task %s completed in session %s", task.ID, task.SessionID))
3017 }
3018 return err
3019 }); err != nil && schedulerCtx.Err() == nil {
3020 iv.ReportError(fmt.Errorf("scheduler stopped: %w", err))
3021 }
3022 }()
3023 go func() {
3024 <-reloadDone
3025 for _, reloadErr := range reloadErrs {
3026 if reloadErr != nil {
3027 iv.ReportError(fmt.Errorf("reload subagents: %w", reloadErr))
3028 }
3029 }
3030 }()
3031
3032 // Bind the interactive TUI as the Confirmer. We deferred this
3033 // until now because the gate is constructed before the TUI
3034 // (the BeforeToolExecute closure captures it). SetConfirmer
3035 // is mutex-guarded on the gate so this is safe.
3036 if confirmGate != nil {
3037 confirmGate.SetConfirmer(&confirmationEventConfirmer{
3038 inner: iv,
3039 emit: extMgr.EmitEvent,
3040 })
3041 }
3042
3043 // Signal-driven flush: a SIGTERM / SIGHUP to the zut process
3044 // (closed terminal window, system shutdown, kill) used to lose
3045 // the entire in-memory transcript because the deferred post-Run
3046 // flush below never ran. Per-message persistence above covers
3047 // most of it; this handler writes any in-flight remainder and
3048 // then exits the process so we don't double-paint over a
3049 // broken terminal that the TUI's restore deferreds can no
3050 // longer fix from a signal context.
3051 //
3052 // SIGINT is intentionally NOT handled here — the TUI consumes
3053 // Ctrl+C as a regular key event for cancel/clear semantics, and
3054 // installing a SIGINT notifier here would swallow it.
3055 sigCh := make(chan os.Signal, 1)
3056 signal.Notify(sigCh, syscall.SIGTERM, syscall.SIGHUP)
3057 defer signal.Stop(sigCh)
3058 go func() {
3059 _, ok := <-sigCh
3060 if !ok {
3061 return
3062 }
3063 finalAg := iv.Agent()
3064 if finalAg != nil {
3065 persistMu.Lock()
3066 if sess != nil {
3067 next, flushErr := writeNewTranscriptLocked(finalAg, sess, sessBaselineMsgs)
3068 sessBaselineMsgs = next
3069 if flushErr != nil {
3070 fmt.Fprintf(os.Stderr, "flush session: %v\n", flushErr)
3071 }
3072 if closeErr := sess.Close(); closeErr != nil {
3073 fmt.Fprintf(os.Stderr, "close session: %v\n", closeErr)
3074 }
3075 sess = nil
3076 }
3077 persistMu.Unlock()
3078 }
3079 closeAgentLSP(finalAg)
3080 closeResolvedLSP(r)
3081 // Stop supervised workers before exiting. os.Exit skips deferred
3082 // cleanup, so wait for reload and close the shared runtime explicitly.
3083 <-reloadDone
3084 _ = closeSubagentRuntimeFresh(runtime)
3085 // Exit cleanly. Re-raising the signal would skip os.Exit's
3086 // at-exit hooks; explicit exit is fine because we've already
3087 // flushed the only at-risk state (the session file) and stopped
3088 // supervised workers.
3089 os.Exit(0)
3090 }()
3091
3092 runErr = iv.Run(ctx)
3093
3094 // Flush final transcript to session (only if we had / ended up with an agent).
3095 if finalAg := iv.Agent(); finalAg != nil {
3096 persistMu.Lock()
3097 if sess != nil {
3098 next, flushErr := writeNewTranscriptLocked(finalAg, sess, sessBaselineMsgs)
3099 sessBaselineMsgs = next
3100 if flushErr != nil {
3101 runErr = errors.Join(runErr, fmt.Errorf("flush session: %w", flushErr))
3102 }
3103 }
3104 persistMu.Unlock()
3105 }
3106 return runErr
3107}
3108
3109func resumableSessionID(root string, sess *core.Session, hasMessages bool) string {
3110 if !hasMessages || sess == nil || sess.ID == "" || sess.Path == "" {
3111 return ""
3112 }
3113 managedRoot, err := filepath.Abs(filepath.Join(root, "sessions"))
3114 if err != nil {
3115 return ""
3116 }
3117 path, err := filepath.Abs(sess.Path)
3118 if err != nil {
3119 return ""
3120 }
3121 rel, err := filepath.Rel(managedRoot, path)
3122 if err != nil || rel == "." || rel == ".." || strings.HasPrefix(rel, ".."+string(filepath.Separator)) {
3123 return ""
3124 }
3125 if _, err := os.Stat(path); err != nil {
3126 return ""
3127 }
3128 return sess.ID
3129}
3130
3131func resumeSessionHint(id string) string {
3132 return fmt.Sprintf("Session ID: %s\nResume with: zut --resume %s\n\n", id, id)
3133}
3134
3135func agentSessionsRoot(root string, args Args) string {
3136 if args.AgentName == "" {
3137 return root
3138 }
3139 return filepath.Join(root, "sessions", "agents", safeAgentName(args.AgentName))
3140}
3141
3142// openOrCreateSession returns a session for the run. sess may be nil
3143// with a nil error if session persistence is disabled.
3144func openOrCreateSession(ctx context.Context, args Args, r Resolved, ag *core.Agent, version string) (*core.Session, error) {
3145 if args.NoSess {
3146 // Allocate the one logical identity for this non-persisted run during
3147 // runtime assembly instead of allowing a provider adapter to invent it.
3148 ag.SessionID()
3149 return nil, nil
3150 }
3151 // Sweep meta-only files left over from older zut versions (and from
3152 // any session that crashed before its first AppendMessage) for the
3153 // cwd-scoped picker paths. Explicit UUID lookup identifies candidates
3154 // from their headers so unrelated transcript corruption does not block
3155 // a valid resume.
3156 sessionsRoot := agentSessionsRoot(ZutHome(), args)
3157 if args.ResumeSessionID == "" {
3158 core.PruneEmptySessions(sessionsRoot, args.CWD)
3159 }
3160 var (
3161 s *core.Session
3162 msgs []provider.Message
3163 err error
3164 )
3165 switch {
3166 case args.Session != "":
3167 s, msgs, err = core.OpenSession(args.Session)
3168 // An explicit session path may be created on first use; session pickers
3169 // and resume paths still select existing files only.
3170 if err != nil && errors.Is(err, os.ErrNotExist) {
3171 s, err = core.NewSessionAtPath(args.Session, args.CWD, r.Provider, r.Model, version)
3172 msgs = nil
3173 }
3174 case args.Continue:
3175 latest := core.LatestSession(sessionsRoot, args.CWD)
3176 if latest != "" {
3177 s, msgs, err = core.OpenSession(latest)
3178 }
3179 case args.Resume:
3180 if args.ResumeSessionID != "" {
3181 picked, lookupErr := core.FindManagedSessionByID(ctx, ZutHome(), args.ResumeSessionID)
3182 if lookupErr != nil {
3183 return nil, lookupErr
3184 }
3185 if picked == "" {
3186 return nil, fmt.Errorf("session %q not found", args.ResumeSessionID)
3187 }
3188 s, msgs, err = core.OpenSession(picked)
3189 if err == nil && s.ID != args.ResumeSessionID {
3190 closeErr := s.Close()
3191 return nil, errors.Join(
3192 fmt.Errorf("session %q changed during resume", args.ResumeSessionID),
3193 closeErr,
3194 )
3195 }
3196 break
3197 }
3198 picked, perr := pickSession(sessionsRoot, args.CWD)
3199 if perr != nil {
3200 return nil, perr
3201 }
3202 if picked != "" {
3203 s, msgs, err = core.OpenSession(picked)
3204 }
3205 }
3206 if err != nil {
3207 return nil, err
3208 }
3209 if s != nil {
3210 if err := ag.BindSessionID(s.Meta.ID); err != nil {
3211 return nil, err
3212 }
3213 ag.SetSessionTimeContext(s.Meta.Started, s.Meta.Timezone, s.Meta.TimezoneOffset)
3214 ag.SetMessages(msgs)
3215 if cum, last, uerr := core.SessionUsageDetail(s.Path); uerr == nil {
3216 ag.SeedCost(cum)
3217 ag.SeedLastTurnUsage(last)
3218 }
3219 return s, nil
3220 }
3221 s, err = core.NewSession(sessionsRoot, args.CWD, r.Provider, r.Model, version)
3222 if err == nil {
3223 if bindErr := ag.BindSessionID(s.Meta.ID); bindErr != nil {
3224 return nil, bindErr
3225 }
3226 ag.SetSessionTimeContext(s.Meta.Started, s.Meta.Timezone, s.Meta.TimezoneOffset)
3227 }
3228 return s, err
3229}
3230
3231func pickSession(root, cwd string) (string, error) {
3232 files := core.ListSessions(root, cwd)
3233 if len(files) == 0 {
3234 fmt.Fprintln(os.Stderr, "no sessions for", cwd)
3235 return "", nil
3236 }
3237 for i, f := range files {
3238 fmt.Fprintf(os.Stderr, " %2d) %s\n", i+1, f)
3239 }
3240 fmt.Fprint(os.Stderr, "pick #: ")
3241 rd := bufio.NewReader(os.Stdin)
3242 line, _ := rd.ReadString('\n')
3243 line = strings.TrimSpace(line)
3244 var n int
3245 if _, err := fmt.Sscanf(line, "%d", &n); err != nil || n < 1 || n > len(files) {
3246 return "", fmt.Errorf("invalid selection")
3247 }
3248 return files[n-1], nil
3249}
3250
3251// WriteNewTranscript appends only messages after index `from` from the
3252// agent's transcript to the session. Used by callers that don't hold
3253// the persistMu (non-interactive print/json modes which run a single
3254// turn under their own goroutine).
3255func WriteNewTranscript(ag *core.Agent, sess *core.Session, from int) error {
3256 _, err := writeNewTranscriptLocked(ag, sess, from)
3257 return err
3258}
3259
3260func wireRetryLifecyclePersistence(ag *core.Agent, sess *core.Session) {
3261 if ag == nil {
3262 return
3263 }
3264 if sess == nil {
3265 ag.OnRetryLifecycle = nil
3266 return
3267 }
3268 ag.OnRetryLifecycle = sess.RecordRetryLifecycle
3269}
3270
3271// writeNewTranscriptLocked is the same as WriteNewTranscript. The
3272// suffix marks that interactive callers must hold persistMu when
3273// invoking it so concurrent appends from the agent loop don't race
3274// with this catch-up flush.
3275func writeNewTranscriptLocked(ag *core.Agent, sess *core.Session, from int) (next int, err error) {
3276 next = from
3277 if sess == nil || ag == nil {
3278 return next, nil
3279 }
3280 msgs, total := ag.MessagesFrom(from)
3281 for offset, msg := range msgs {
3282 index := from + offset
3283 if err := sess.AppendMessage(msg); err != nil {
3284 return next, fmt.Errorf("append transcript message %d: %w", index, err)
3285 }
3286 next = index + 1
3287 }
3288 if len(msgs) == 0 {
3289 next = total
3290 }
3291 cum := ag.Cost()
3292 if err := sess.AppendUsage(cum, cum); err != nil {
3293 return next, fmt.Errorf("append transcript usage: %w", err)
3294 }
3295 if err := sess.Flush(); err != nil {
3296 return next, fmt.Errorf("flush transcript: %w", err)
3297 }
3298 return next, nil
3299}
3300
3301func argsForStdin(rawArgs []string, mode os.FileMode) []string {
3302 if mode&os.ModeCharDevice != 0 {
3303 return rawArgs
3304 }
3305 return append([]string{"--print"}, rawArgs...)
3306}
3307
3308func combinePromptInput(stdin, positional string) string {
3309 parts := make([]string, 0, 2)
3310 if stdin = strings.TrimSpace(stdin); stdin != "" {
3311 parts = append(parts, stdin)
3312 }
3313 if positional = strings.TrimSpace(positional); positional != "" {
3314 parts = append(parts, positional)
3315 }
3316 return strings.Join(parts, "\n")
3317}
3318
3319func readAllStdin() (string, error) {
3320 fi, err := os.Stdin.Stat()
3321 if err != nil {
3322 return "", err
3323 }
3324 if (fi.Mode() & os.ModeCharDevice) != 0 {
3325 return "", nil
3326 }
3327 return readAllStdinFrom(os.Stdin)
3328}
3329
3330func readAllStdinFrom(r io.Reader) (string, error) {
3331 b, err := io.ReadAll(r)
3332 return string(b), err
3333}
3334
3335func printModels() {
3336 models := provider.Active()
3337
3338 // Compute column widths from actual data so wide providers (e.g.
3339 // xiaomi-token-plan-sgp) and long bedrock model ids don't force the
3340 // `name` column off-screen. Floors mirror the historical layout so
3341 // short catalogs look the same as before.
3342 provW, idW, srcW := len("provider"), len("model id"), len("source")
3343 for _, m := range models {
3344 if w := len(m.Provider); w > provW {
3345 provW = w
3346 }
3347 if w := len(m.ID); w > idW {
3348 idW = w
3349 }
3350 source := m.Source
3351 if source == "" {
3352 source = "catalog"
3353 }
3354 if m.Speculative {
3355 source = "speculative"
3356 }
3357 if w := len(source); w > srcW {
3358 srcW = w
3359 }
3360 }
3361
3362 header := fmt.Sprintf("%-*s %-*s %8s %8s %s %-*s %s",
3363 provW, "provider",
3364 idW, "model id",
3365 "context", "max-out", "reasoning",
3366 srcW, "source",
3367 "name")
3368 fmt.Println(header)
3369
3370 for _, m := range models {
3371 reason := " "
3372 if m.Reasoning {
3373 reason = "✓"
3374 }
3375 source := m.Source
3376 if source == "" {
3377 source = "catalog"
3378 }
3379 if m.Speculative {
3380 source = "speculative"
3381 }
3382 fmt.Printf("%-*s %-*s %8d %8d %s %-*s %s\n",
3383 provW, m.Provider,
3384 idW, m.ID,
3385 m.ContextWindow, m.MaxOutput,
3386 reason,
3387 srcW, source,
3388 m.DisplayName)
3389 }
3390}
3391
3392// confirmationKeyFor returns the session-scoped confirmation grant key for a
3393// tool call. A tool that implements core.ConfirmationKeyer may expose a finer
3394// key than its name (the subagent facade keys one grant per action); every
3395// other tool, and any unknown tool, keeps its own name. It mirrors the
3396// confirmation gate's lookup so a remembered grant matches the call that will
3397// actually run.
3398func confirmationKeyFor(reg core.Registry, name string, args json.RawMessage) string {
3399 tool, err := reg.Get(name)
3400 if err != nil {
3401 return name
3402 }
3403 return core.ConfirmationKey(tool, name, args)
3404}