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