1package agent
2
3import (
4 "bufio"
5 "context"
6 "encoding/json"
7 "errors"
8 "fmt"
9 "io"
10 "os"
11 "os/signal"
12 "path/filepath"
13 "slices"
14 "strings"
15 "sync"
16 "syscall"
17 "time"
18
19 "github.com/bnema/zut/packages/agent/extensions"
20 "github.com/bnema/zut/packages/agent/extproto"
21 "github.com/bnema/zut/packages/agent/modes"
22 "github.com/bnema/zut/packages/agent/scheduler"
23 "github.com/bnema/zut/packages/agent/skills"
24 "github.com/bnema/zut/packages/agent/subagents"
25 "github.com/bnema/zut/packages/agent/tools"
26 "github.com/bnema/zut/packages/core"
27 "github.com/bnema/zut/packages/provider"
28 "github.com/bnema/zut/packages/provider/auth"
29 "github.com/bnema/zut/packages/tui"
30)
31
32// interactiveExtHooks is a tiny adapter that lets the extension
33// manager call back into the Interactive instance built later in
34// runInteractive. Alerts are buffered until the instance is attached so
35// an extension that signals attention during startup is not silently lost.
36// Keep the startup buffer bounded because extensions can flood their host.
37const maxBufferedInteractiveAlerts = 64
38
39type interactiveExtHooks struct {
40 mu sync.Mutex
41 interactive *modes.Interactive
42 pendingAlerts []interactiveAlert
43 pendingStatuses map[string]interactiveStatus
44 pendingWidgets map[string]interactiveWidget
45}
46
47type interactiveAlert struct {
48 extName string
49 alert extproto.AlertRequest
50}
51
52type interactiveStatus struct {
53 extName string
54 key string
55 level string
56 text string
57}
58
59type interactiveWidget struct {
60 extName string
61 id string
62 position string
63 title string
64 lines []string
65}
66
67func (h *interactiveExtHooks) iv() *modes.Interactive {
68 if h == nil {
69 return nil
70 }
71 h.mu.Lock()
72 defer h.mu.Unlock()
73 return h.interactive
74}
75
76func (h *interactiveExtHooks) attachInteractive(iv *modes.Interactive) {
77 if h == nil || iv == nil {
78 return
79 }
80 h.mu.Lock()
81 h.interactive = iv
82 pendingAlerts := h.pendingAlerts
83 pendingStatuses := h.pendingStatuses
84 pendingWidgets := h.pendingWidgets
85 h.pendingAlerts = nil
86 h.pendingStatuses = nil
87 h.pendingWidgets = nil
88 h.mu.Unlock()
89 for _, item := range pendingAlerts {
90 iv.Alert(item.extName, item.alert)
91 }
92 for _, item := range pendingStatuses {
93 iv.SetStatus(item.extName, item.key, item.level, item.text)
94 }
95 for _, item := range pendingWidgets {
96 iv.SetWidget(item.extName, item.id, item.position, item.title, item.lines)
97 }
98}
99
100func (h *interactiveExtHooks) Notify(extName, level, message string) {
101 if iv := h.iv(); iv != nil {
102 iv.Notify(extName, level, message)
103 }
104}
105func (h *interactiveExtHooks) Alert(extName string, alert extproto.AlertRequest) {
106 if h == nil {
107 return
108 }
109 h.mu.Lock()
110 if h.interactive == nil {
111 if len(h.pendingAlerts) < maxBufferedInteractiveAlerts {
112 h.pendingAlerts = append(h.pendingAlerts, interactiveAlert{extName: extName, alert: alert})
113 }
114 h.mu.Unlock()
115 return
116 }
117 iv := h.interactive
118 h.mu.Unlock()
119 iv.Alert(extName, alert)
120}
121func (h *interactiveExtHooks) Submit(text string) {
122 if iv := h.iv(); iv != nil {
123 iv.SubmitOrQueue(text, nil)
124 }
125}
126func (h *interactiveExtHooks) SubmitSlash(text string) {
127 if iv := h.iv(); iv != nil {
128 iv.SubmitSlash(text)
129 }
130}
131func (h *interactiveExtHooks) Insert(text string) {
132 if iv := h.iv(); iv != nil {
133 iv.Insert(text)
134 }
135}
136func (h *interactiveExtHooks) Display(extName, text string) {
137 if iv := h.iv(); iv != nil {
138 iv.Display(extName, text)
139 }
140}
141func (h *interactiveExtHooks) ClearNotes(extName string) {
142 if iv := h.iv(); iv != nil {
143 iv.ClearNotes(extName)
144 }
145}
146func (h *interactiveExtHooks) OpenPanel(extName string, spec extproto.PanelSpec) {
147 if iv := h.iv(); iv != nil {
148 iv.OpenPanel(extName, spec)
149 }
150}
151func (h *interactiveExtHooks) UpdatePanel(extName, panelID, title string, lines []string, footer string) {
152 if iv := h.iv(); iv != nil {
153 iv.UpdatePanel(extName, panelID, title, lines, footer)
154 }
155}
156func (h *interactiveExtHooks) ClosePanel(extName, panelID string) {
157 if iv := h.iv(); iv != nil {
158 iv.ClosePanel(extName, panelID)
159 }
160}
161func pendingChromeKey(extName, key string) string { return extName + "\x00" + key }
162
163func (h *interactiveExtHooks) SetStatus(extName, key, level, text string) {
164 if h == nil {
165 return
166 }
167 h.mu.Lock()
168 if h.interactive == nil {
169 if h.pendingStatuses == nil {
170 h.pendingStatuses = map[string]interactiveStatus{}
171 }
172 pendingKey := pendingChromeKey(extName, key)
173 if strings.TrimSpace(text) == "" {
174 delete(h.pendingStatuses, pendingKey)
175 } else {
176 h.pendingStatuses[pendingKey] = interactiveStatus{extName: extName, key: key, level: level, text: text}
177 }
178 h.mu.Unlock()
179 return
180 }
181 iv := h.interactive
182 h.mu.Unlock()
183 iv.SetStatus(extName, key, level, text)
184}
185func (h *interactiveExtHooks) SetWidget(extName, id, position, title string, lines []string) {
186 if h == nil {
187 return
188 }
189 h.mu.Lock()
190 if h.interactive == nil {
191 if h.pendingWidgets == nil {
192 h.pendingWidgets = map[string]interactiveWidget{}
193 }
194 h.pendingWidgets[pendingChromeKey(extName, id)] = interactiveWidget{
195 extName: extName, id: id, position: position, title: title, lines: append([]string(nil), lines...),
196 }
197 h.mu.Unlock()
198 return
199 }
200 iv := h.interactive
201 h.mu.Unlock()
202 iv.SetWidget(extName, id, position, title, lines)
203}
204func (h *interactiveExtHooks) ClearWidget(extName, id string) {
205 if h == nil {
206 return
207 }
208 h.mu.Lock()
209 if h.interactive == nil {
210 if h.pendingWidgets != nil {
211 delete(h.pendingWidgets, pendingChromeKey(extName, id))
212 }
213 h.mu.Unlock()
214 return
215 }
216 iv := h.interactive
217 h.mu.Unlock()
218 iv.ClearWidget(extName, id)
219}
220
221func (h *interactiveExtHooks) ClearExtensionChrome(extName string) {
222 if h == nil {
223 return
224 }
225 h.mu.Lock()
226 if h.interactive == nil {
227 prefix := extName + "\x00"
228 for key := range h.pendingStatuses {
229 if strings.HasPrefix(key, prefix) {
230 delete(h.pendingStatuses, key)
231 }
232 }
233 for key := range h.pendingWidgets {
234 if strings.HasPrefix(key, prefix) {
235 delete(h.pendingWidgets, key)
236 }
237 }
238 h.mu.Unlock()
239 return
240 }
241 iv := h.interactive
242 h.mu.Unlock()
243 iv.ClearExtensionChrome(extName)
244}
245
246// extToolAdapter bridges *extensions.Manager to the
247// ExtensionToolSource interface declared in build.go (kept narrow to
248// avoid a build->extensions import cycle). One adapter instance per
249// run; used at every Resolve point so re-built agents pick up the
250// same set of extension tools.
251type extToolAdapter struct {
252 mgr *extensions.Manager
253}
254
255var _ ExtensionToolSource = (*extToolAdapter)(nil)
256var _ ExtensionSkillSource = (*extToolAdapter)(nil)
257
258func (a *extToolAdapter) Skills() []*skills.Skill {
259 if a == nil || a.mgr == nil {
260 return nil
261 }
262 return a.mgr.Skills()
263}
264
265func (a *extToolAdapter) Tools() []ExtensionToolInfo {
266 infos := a.mgr.Tools()
267 out := make([]ExtensionToolInfo, len(infos))
268 for i, t := range infos {
269 out[i] = ExtensionToolInfo{
270 Extension: t.Extension,
271 Name: t.Name,
272 Description: t.Description,
273 Schema: t.Schema,
274 Deferred: t.Deferred,
275 }
276 }
277 return out
278}
279
280func (a *extToolAdapter) NewExtensionTool(info ExtensionToolInfo) core.Tool {
281 return extensions.NewTool(a.mgr, extensions.ToolInfo{
282 Extension: info.Extension,
283 Name: info.Name,
284 Description: info.Description,
285 Schema: info.Schema,
286 Deferred: info.Deferred,
287 })
288}
289
290// liveInteractiveAgent returns the agent currently owned by the TUI. The
291// fallback is only used before the Interactive has been constructed.
292//
293// Agent rebuilds, such as cross-provider model switches, replace the TUI's
294// agent without replacing the startup pointer held by runInteractive. Session
295// operations must therefore resolve the live agent at the time of the action.
296func liveInteractiveAgent(iv *modes.Interactive, fallback *core.Agent) *core.Agent {
297 if iv != nil {
298 return iv.Agent()
299 }
300 return fallback
301}
302
303func newSessionTransition(mu *sync.RWMutex) func(func()) {
304 return func(fn func()) {
305 mu.Lock()
306 defer mu.Unlock()
307 fn()
308 }
309}
310
311// newPersistModelCallback returns the callback used by the TUI while its
312// session transition write lock is held. It must not acquire that lock again
313// because sync.RWMutex is not reentrant.
314func newPersistModelCallback(persistMu *sync.Mutex, sess **core.Session, activeProvider, activeModel *string, notify func(string)) func(string, string) {
315 return func(providerName, model string) {
316 providerName = strings.TrimSpace(providerName)
317 model = strings.TrimSpace(model)
318
319 persistMu.Lock()
320 var sessionErr error
321 if *sess != nil {
322 sessionErr = (*sess).UpdateModel(providerName, model)
323 }
324 *activeProvider = providerName
325 *activeModel = model
326 persistMu.Unlock()
327 if sessionErr != nil {
328 if notify != nil {
329 notify("model change was not persisted: " + sessionErr.Error())
330 }
331 return
332 }
333
334 cfg, err := LoadConfig()
335 if err != nil {
336 if notify != nil {
337 notify("model changed for this run, but config could not be read: " + err.Error())
338 }
339 return
340 }
341 cfg.Provider = providerName
342 cfg.Model = model
343 if err := SaveConfig(cfg); err != nil && notify != nil {
344 notify("model changed for this run, but config could not be saved: " + err.Error())
345 }
346 }
347}
348
349func closeAgentLSP(ag *core.Agent) {
350 if ag != nil {
351 _ = tools.CloseLSPManagers(ag.ToolsSnapshot())
352 }
353}
354
355func joinSessionCloseError(err error, sess *core.Session) error {
356 if sess == nil {
357 return err
358 }
359 if closeErr := sess.Close(); closeErr != nil {
360 return errors.Join(err, fmt.Errorf("close session: %w", closeErr))
361 }
362 return err
363}
364
365func closeResolvedLSP(r Resolved) {
366 _ = tools.CloseLSPManagers(r.ToolRegistry)
367}
368
369func trimMessagesForResume(msgs []provider.Message, keepTail int) []provider.Message {
370 if keepTail <= 0 || len(msgs) <= keepTail {
371 return provider.RepairOrphanedToolResults(msgs)
372 }
373 var out []provider.Message
374 start := len(msgs) - keepTail
375 var carriedToolNames []string
376 addToolNames := func(names []string) {
377 for _, name := range names {
378 if name == "" || slices.Contains(carriedToolNames, name) {
379 continue
380 }
381 carriedToolNames = append(carriedToolNames, name)
382 }
383 }
384 // Activation markers in the discarded prefix still affect the retained
385 // provider request. Carry them onto its first message rather than dropping
386 // deferred-tool availability when the resume tail is shortened.
387 for _, msg := range msgs[:start] {
388 addToolNames(msg.AddedToolNames)
389 }
390 // Preserve the synthetic compaction summary when present so an
391 // already-compacted session stays compacted after resume. Count it
392 // within the tail budget instead of dropping it at the exact boundary.
393 if len(msgs) > 0 && msgs[0].Meta["compaction"] == "true" && start > 0 {
394 out = append(out, msgs[0])
395 start++
396 }
397 // Avoid hydrating a tail that starts with orphan tool_result rows;
398 // provider APIs require those to be paired with an earlier tool_use.
399 for start < len(msgs) && msgs[start].Role == provider.RoleTool {
400 start++
401 }
402 out = append(out, msgs[start:]...)
403 if len(carriedToolNames) > 0 && len(out) > 0 {
404 first := out[0]
405 for _, name := range first.AddedToolNames {
406 addToolNames([]string{name})
407 }
408 first.AddedToolNames = append([]string(nil), carriedToolNames...)
409 out[0] = first
410 }
411 return provider.RepairOrphanedToolResults(out)
412}
413
414// sessionResumeCandidate contains all state needed to resume a session.
415// It is deliberately assembled before the caller changes any live state:
416// opening the transcript, reading usage, and rebuilding a provider/model
417// must all succeed before the candidate can replace the current session.
418type sessionResumeCandidate struct {
419 session *core.Session
420 agent *core.Agent
421 messages []provider.Message
422 fullMessageCount int
423 cumulative provider.Usage
424 lastTurn provider.Usage
425 provider string
426 model string
427 rebuilt bool
428}
429
430// prepareSessionResume opens and validates a selected session without
431// touching the current agent. Missing provider/model metadata is treated as
432// legacy metadata: the current agent is reused, preserving compatibility
433// with sessions written before those fields were persisted.
434//
435// The returned candidate owns session until its caller commits it. On any
436// error this function closes the candidate session and leaves the current
437// agent untouched.
438func prepareSessionResume(path string, current *core.Agent, currentProvider, currentModel string, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (sessionResumeCandidate, error) {
439 return prepareSessionResumeWithOptions(path, current, currentProvider, currentModel, false, false, false, buildAgentFor)
440}
441
442// prepareSessionResumeForWorkspace always rebuilds the agent. A selected
443// transcript from another cwd must not retain tools, instructions, or sandbox
444// state assembled for the previous workspace even when provider/model match.
445func prepareSessionResumeForWorkspace(path string, current *core.Agent, currentProvider, currentModel string, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (sessionResumeCandidate, error) {
446 return prepareSessionResumeWithOptions(path, current, currentProvider, currentModel, false, false, true, buildAgentFor)
447}
448
449// prepareSessionResumeWithOptions is the provider/model-aware implementation.
450// An explicit CLI provider or model keeps that field authoritative; an empty
451// field falls back to the selected session's metadata when it is complete.
452func 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) {
453 if current == nil {
454 return candidate, fmt.Errorf("no agent running; log in first")
455 }
456
457 sess, msgs, err := core.OpenSession(path)
458 if err != nil {
459 return candidate, err
460 }
461 keepSession := false
462 defer func() {
463 if !keepSession {
464 err = joinSessionCloseError(err, sess)
465 }
466 }()
467
468 cumulative, lastTurn, err := core.SessionUsageDetail(path)
469 if err != nil {
470 return candidate, fmt.Errorf("read session usage: %w", err)
471 }
472
473 fullMessageCount := len(msgs)
474 resumedMessages := trimMessagesForResume(msgs, 100)
475 storedProvider := strings.TrimSpace(sess.Meta.Provider)
476 storedModel := strings.TrimSpace(sess.Meta.Model)
477 currentProvider = strings.TrimSpace(currentProvider)
478 currentModel = strings.TrimSpace(currentModel)
479
480 candidate = sessionResumeCandidate{
481 session: sess,
482 agent: current,
483 messages: resumedMessages,
484 fullMessageCount: fullMessageCount,
485 cumulative: cumulative,
486 lastTurn: lastTurn,
487 provider: currentProvider,
488 model: currentModel,
489 }
490
491 // Old sessions may have either field absent. Only a complete stored
492 // selection is actionable; otherwise resume exactly as older zut did.
493 if storedProvider == "" || storedModel == "" {
494 keepSession = true
495 return candidate, nil
496 }
497
498 resumeProvider := storedProvider
499 if explicitProvider {
500 resumeProvider = currentProvider
501 }
502 resumeModel := storedModel
503 if explicitModel {
504 resumeModel = currentModel
505 }
506 if !forceRebuild && resumeProvider == currentProvider && resumeModel == currentModel {
507 keepSession = true
508 return candidate, nil
509 }
510 if buildAgentFor == nil {
511 return sessionResumeCandidate{}, fmt.Errorf("cannot resume session with provider %q and model %q: no agent builder configured", resumeProvider, resumeModel)
512 }
513
514 rebuilt, resolvedProvider, resolvedModel, err := buildAgentFor(resumeProvider, resumeModel)
515 if err != nil {
516 return sessionResumeCandidate{}, fmt.Errorf("rebuild agent for session provider %q/model %q: %w", resumeProvider, resumeModel, err)
517 }
518 if rebuilt == nil {
519 return sessionResumeCandidate{}, fmt.Errorf("rebuild agent for session provider %q/model %q returned no agent", resumeProvider, resumeModel)
520 }
521 resolvedProvider = strings.TrimSpace(resolvedProvider)
522 resolvedModel = strings.TrimSpace(resolvedModel)
523 if resolvedProvider == "" {
524 resolvedProvider = storedProvider
525 }
526 if resolvedModel == "" {
527 resolvedModel = storedModel
528 }
529
530 // Hydrate and seed the replacement while it is still private. The live
531 // agent is not modified until the caller commits the complete candidate.
532 rebuilt.SetMessages(resumedMessages)
533 rebuilt.SeedCost(cumulative)
534 rebuilt.SeedLastTurnUsage(lastTurn)
535 candidate.agent = rebuilt
536 candidate.provider = resolvedProvider
537 candidate.model = resolvedModel
538 candidate.rebuilt = true
539 keepSession = true
540 return candidate, nil
541}
542
543func 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) {
544 next := args
545 next.Provider = providerName
546 next.Model = model
547 resolved, err := Resolve(next, true)
548 if err != nil {
549 return nil, "", "", err
550 }
551 resolved.UseSandbox(base.Sandbox)
552 if extMgr != nil {
553 resolved.MergeExtensionTools(&extToolAdapter{mgr: extMgr})
554 }
555 if prepareRegistry != nil {
556 prepareRegistry(resolved.ToolRegistry)
557 }
558 ag := resolved.NewAgent()
559 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
560 return ag, resolved.Provider, resolved.Model, nil
561}
562
563// applySessionResume shares the startup gate, candidate hydration, and
564// commit order used by interactive and non-interactive session opening. The
565// old append handle is closed only after the candidate has been prepared and
566// seeded successfully.
567func applySessionResume(sess *core.Session, ag *core.Agent, currentProvider, currentModel string, explicitProvider, explicitModel bool, buildAgentFor func(string, string) (*core.Agent, string, string, error)) (sessionResumeCandidate, error) {
568 candidate := sessionResumeCandidate{
569 session: sess,
570 agent: ag,
571 fullMessageCount: 0,
572 provider: currentProvider,
573 model: currentModel,
574 }
575 if ag != nil {
576 candidate.fullMessageCount = len(ag.Messages())
577 }
578 if sess == nil || ag == nil {
579 return candidate, nil
580 }
581 ag.SetSessionTimeContext(sess.Meta.Started, sess.Meta.Timezone, sess.Meta.TimezoneOffset)
582 // A newly created meta-only session is already on the active pair. Avoid
583 // reopening and closing it through the resume path: Close intentionally
584 // removes fresh empty sessions, and a second append handle would otherwise
585 // keep an unlinked file alive.
586 if len(ag.Messages()) == 0 &&
587 strings.TrimSpace(sess.Meta.Provider) == strings.TrimSpace(currentProvider) &&
588 strings.TrimSpace(sess.Meta.Model) == strings.TrimSpace(currentModel) {
589 return candidate, nil
590 }
591 candidate, err := prepareSessionResumeWithOptions(sess.Path, ag, currentProvider, currentModel, explicitProvider, explicitModel, false, buildAgentFor)
592 if err != nil {
593 return sessionResumeCandidate{}, joinSessionCloseError(err, sess)
594 }
595 // A replacement agent is still private at this point. Bind the durable
596 // identity before it can be published or run any startup work.
597 if err := candidate.agent.BindSessionID(candidate.session.Meta.ID); err != nil {
598 return sessionResumeCandidate{}, joinSessionCloseError(err, candidate.session)
599 }
600 if !candidate.rebuilt {
601 candidate.agent.SetMessages(candidate.messages)
602 candidate.agent.SeedCost(candidate.cumulative)
603 candidate.agent.SeedLastTurnUsage(candidate.lastTurn)
604 }
605 if closeErr := sess.Close(); closeErr != nil {
606 return sessionResumeCandidate{}, errors.Join(fmt.Errorf("close session: %w", closeErr), joinSessionCloseError(nil, candidate.session))
607 }
608 candidate.agent.SetSessionTimeContext(candidate.session.Meta.Started, candidate.session.Meta.Timezone, candidate.session.Meta.TimezoneOffset)
609 return candidate, nil
610}
611
612// applyInitialSessionResume applies the same provider/model-aware candidate
613// contract used by interactive session switching to non-interactive startup
614// modes. The returned session owns the replacement append handle.
615func applyInitialSessionResume(ctx context.Context, args Args, base Resolved, extMgr *extensions.Manager, sess *core.Session, ag *core.Agent) (*core.Session, *core.Agent, string, string, error) {
616 return applyInitialSessionResumeWithRegistry(ctx, args, base, extMgr, sess, ag, nil)
617}
618
619func 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) {
620 candidate, err := applySessionResume(sess, ag, base.Provider, base.Model,
621 strings.TrimSpace(args.Provider) != "", strings.TrimSpace(args.Model) != "", func(providerName, model string) (*core.Agent, string, string, error) {
622 return buildNonInteractiveSessionAgentWithRegistry(ctx, args, base, extMgr, providerName, model, prepareRegistry)
623 })
624 if err != nil {
625 return nil, ag, "", "", err
626 }
627 return candidate.session, candidate.agent, candidate.provider, candidate.model, nil
628}
629
630func 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) {
631 candidate, err := applySessionResume(sess, ag, base.Provider, base.Model,
632 strings.TrimSpace(args.Provider) != "", strings.TrimSpace(args.Model) != "", func(providerName, model string) (*core.Agent, string, string, error) {
633 next := args
634 next.Provider = providerName
635 next.Model = model
636 resolved, resolveErr := Resolve(next, true)
637 if resolveErr != nil {
638 return nil, "", "", resolveErr
639 }
640 resolved.UseSandbox(base.Sandbox)
641 if extMgr != nil {
642 resolved.MergeExtensionTools(&extToolAdapter{mgr: extMgr})
643 }
644 if runtime != nil {
645 runtime.SetProvider(resolved.Provider)
646 runtime.SetModel(resolved.Model)
647 runtime.SetContextWindow(resolved.ContextWindow)
648 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
649 runtime.SetFastMode(resolved.FastMode)
650 runtime.PrepareResolvedRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
651 }
652 rebuilt := resolved.NewAgent()
653 wireNonInteractiveAgentExtHooks(ctx, rebuilt, extMgr)
654 return rebuilt, resolved.Provider, resolved.Model, nil
655 })
656 if err != nil {
657 return nil, ag, "", "", err
658 }
659 return candidate.session, candidate.agent, candidate.provider, candidate.model, nil
660}
661
662// fanoutAgentEvent translates a core.AgentEvent into the wire-format
663// EventFromHost and pushes it through the extension manager. Only
664// the events that have a clear extension-facing meaning are
665// forwarded; internal-only ones (text_delta, tool_progress) are
666// dropped to keep the per-extension stream sane.
667func sessionContext(sess *core.Session) *extproto.SessionContext {
668 if sess == nil {
669 return nil
670 }
671 return &extproto.SessionContext{
672 ID: sess.Meta.ID,
673 ParentID: sess.Meta.Parent,
674 Path: sess.Path,
675 CWD: sess.Meta.CWD,
676 ForkPoint: sess.Meta.ForkPoint,
677 }
678}
679
680func announceSession(mgr *extensions.Manager, sess *core.Session) {
681 if mgr == nil {
682 return
683 }
684 var states map[string]json.RawMessage
685 if sess != nil {
686 states = copyExtensionStates(sess.ExtensionState)
687 }
688 mgr.EmitSessionEvent("session_start", sessionContext(sess), states)
689 if sess != nil {
690 mgr.EmitSessionEvent("session_opened", sessionContext(sess), states)
691 }
692}
693
694func copyExtensionStates(states map[string]json.RawMessage) map[string]json.RawMessage {
695 if len(states) == 0 {
696 return nil
697 }
698 out := make(map[string]json.RawMessage, len(states))
699 for name, state := range states {
700 out[name] = append(json.RawMessage(nil), state...)
701 }
702 return out
703}
704
705var (
706 errGoalActiveReplacement = errors.New("active goal replacement")
707 errGoalMissionMismatch = errors.New("goal mission mismatch")
708 errGoalStaleUpdate = errors.New("stale goal update")
709 errGoalStorageUnavailable = errors.New("goal storage unavailable")
710 errGoalStateWrite = errors.New("goal state write")
711)
712
713func persistToolResultState(mgr *extensions.Manager, sess *core.Session, result core.ToolResult, goalMaxTokenBudget ...*uint64) error {
714 if sess == nil {
715 if _, ok := tools.GoalUpdateFromResult(result); ok {
716 return goalCommitError(errGoalStorageUnavailable)
717 }
718 return nil
719 }
720 if details, ok := result.Details.(extensions.ToolResultDetails); ok && details.Extension != "" && len(details.State) > 0 {
721 if err := sess.AppendExtensionState(details.Extension, details.State); err != nil {
722 return fmt.Errorf("extension state: %w", err)
723 }
724 if mgr != nil {
725 mgr.UpdateSessionState(details.Extension, details.State)
726 }
727 }
728 if err := persistGoalToolResult(sess, result, goalMaxTokenBudget...); err != nil {
729 return goalCommitError(err)
730 }
731 return nil
732}
733
734func goalCommitError(err error) error {
735 return &core.ToolResultCommitError{Message: safeGoalCommitMessage(err), Err: fmt.Errorf("goal state: %w", err)}
736}
737
738func safeGoalCommitMessage(err error) string {
739 switch {
740 case errors.Is(err, errGoalActiveReplacement):
741 return "goal transition rejected: the current goal is still active"
742 case errors.Is(err, errGoalMissionMismatch):
743 return "goal transition rejected: it does not belong to the active mission"
744 case errors.Is(err, errGoalStaleUpdate):
745 return "goal transition rejected: the active goal changed"
746 case errors.Is(err, errGoalStorageUnavailable):
747 return "goal state unavailable: session persistence is disabled"
748 case errors.Is(err, errGoalStateWrite):
749 return "goal state could not be saved"
750 default:
751 return "goal update could not be persisted"
752 }
753}
754
755func persistGoalToolResult(sess *core.Session, result core.ToolResult, goalMaxTokenBudget ...*uint64) error {
756 if sess == nil {
757 return nil
758 }
759 update, ok := tools.GoalUpdateFromResult(result)
760 if !ok {
761 return nil
762 }
763 if update.Status == core.GoalSuperseded {
764 if sess.Meta.Goal == nil || sess.Meta.Goal.Status != core.GoalActive {
765 return nil
766 }
767 if update.GoalID != sess.Meta.Goal.ID {
768 return errGoalStaleUpdate
769 }
770 if sess.Meta.Mission != nil && update.MissionID != "" && update.MissionID != sess.Meta.Mission.ID {
771 return errGoalMissionMismatch
772 }
773 replacement := &core.SessionGoal{Objective: update.Objective, Status: core.GoalActive, Owner: core.GoalOwnerManager}
774 if len(goalMaxTokenBudget) > 0 && goalMaxTokenBudget[0] != nil && *goalMaxTokenBudget[0] > 0 {
775 budget := *goalMaxTokenBudget[0]
776 replacement.TokenBudget = &budget
777 }
778 if err := sess.SupersedeGoal(replacement); err != nil {
779 return fmt.Errorf("%w: %w", errGoalStateWrite, err)
780 }
781 return nil
782 }
783 if update.Status == core.GoalActive {
784 if sess.Meta.Goal != nil && sess.Meta.Goal.Status == core.GoalActive {
785 return errGoalActiveReplacement
786 }
787 if sess.Meta.Mission != nil && update.MissionID != "" && update.MissionID != sess.Meta.Mission.ID {
788 return errGoalMissionMismatch
789 }
790 goal := &core.SessionGoal{Objective: update.Objective, Status: core.GoalActive, Owner: core.GoalOwnerManager}
791 if len(goalMaxTokenBudget) > 0 && goalMaxTokenBudget[0] != nil && *goalMaxTokenBudget[0] > 0 {
792 budget := *goalMaxTokenBudget[0]
793 goal.TokenBudget = &budget
794 }
795 if err := sess.UpdateGoal(goal); err != nil {
796 return fmt.Errorf("%w: %w", errGoalStateWrite, err)
797 }
798 return nil
799 }
800 if sess.Meta.Goal == nil || sess.Meta.Goal.Status != core.GoalActive {
801 return nil
802 }
803 goal := *sess.Meta.Goal
804 goal.Status = update.Status
805 goal.Reason = update.Reason
806 if err := sess.UpdateGoal(&goal); err != nil {
807 return fmt.Errorf("%w: %w", errGoalStateWrite, err)
808 }
809 return nil
810}
811
812func fanoutAgentEvent(mgr *extensions.Manager, ev core.AgentEvent) {
813 if mgr == nil {
814 return
815 }
816 switch e := ev.(type) {
817 case core.EvTurnStart:
818 mgr.EmitEvent(extproto.EventFromHost{Event: "turn_start", Step: e.Step})
819 case core.EvToolCall:
820 mgr.EmitEvent(extproto.EventFromHost{
821 Event: "tool_call", ToolID: e.ID, ToolName: e.Name, ToolArgs: e.Args,
822 })
823 case core.EvAssistantMessage:
824 // Concat the visible text portions of the message; binary
825 // blocks (tool_use, etc.) are skipped because subscribers
826 // usually want a string they can grep / display.
827 var text string
828 for _, c := range e.Message.Content {
829 if tb, ok := c.(provider.TextBlock); ok {
830 text += tb.Text
831 }
832 }
833 mgr.EmitEvent(extproto.EventFromHost{Event: "assistant_message", Text: text})
834 case core.EvTurnEnd:
835 ev := extproto.EventFromHost{Event: "turn_end", Stop: string(e.Stop)}
836 if e.Err != nil {
837 ev.Error = e.Err.Error()
838 }
839 mgr.EmitEvent(ev)
840 }
841}
842
843// Run is the top-level entrypoint for the zut binary.
844func Run(rawArgs []string, version string) error {
845 // Apply network configuration before any subcommand can make an HTTP
846 // request. Standard proxy environment variables retain precedence.
847 applyConfiguredHTTPProxy()
848
849 // Extension installs can invoke external build and clone processes.
850 // Give those processes a cancellation context without changing signal
851 // handling for the interactive modes below.
852 extCtx := context.Background()
853 stopExtContext := func() {}
854 if len(rawArgs) > 0 && rawArgs[0] == "ext" {
855 extCtx, stopExtContext = signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
856 }
857 defer stopExtContext()
858
859 // Subcommand router: `zut bot ...` is handled separately so the
860 // generic flag parser doesn't reject "bot" as a positional arg.
861 if handled, err := runBotCommand(rawArgs, version); handled {
862 return err
863 }
864 if handled, err := runExtCommand(extCtx, rawArgs, version); handled {
865 return err
866 }
867 if handled, err := runUpdateCommand(rawArgs, version); handled {
868 return err
869 }
870 if handled, err := runZutfileCommand(rawArgs, version); handled {
871 return err
872 }
873 return runWithArgsRaw(rawArgs, version)
874}
875
876func runWithArgsRaw(rawArgs []string, version string) error {
877 // `zut rpc` is shorthand for `zut --rpc` so third-party apps can
878 // spawn the binary with a clean argv. Strip the leading 'rpc'
879 // token and let the rest flow through the normal arg parser.
880 if len(rawArgs) > 0 && rawArgs[0] == "rpc" {
881 rawArgs = append([]string{"--rpc"}, rawArgs[1:]...)
882 }
883
884 if fi, err := os.Stdin.Stat(); err == nil {
885 rawArgs = argsForStdin(rawArgs, fi.Mode())
886 }
887 args, err := ParseArgs(rawArgs)
888 if err != nil {
889 PrintHelp(version)
890 return err
891 }
892 if args.Help {
893 PrintHelp(version)
894 return nil
895 }
896 if args.Version {
897 fmt.Println("zut", version)
898 return nil
899 }
900 // Reject invalid orchestration combinations before catalog repair or model
901 // refresh can mutate local state or launch background work.
902 if err := validateOrchestrationArgs(args); err != nil {
903 return err
904 }
905 // Model catalog: load any cached discovery data before we inspect
906 // the model list (list-models, print/json, interactive).
907 userModels := LoadUserModels()
908 PrepareRuntimeCatalog(context.Background(), args.ListModels, args.Provider, args.APIKey, args.BaseURL, userModels, args.Model)
909
910 if args.ListModels {
911 printModels()
912 return nil
913 }
914
915 return runWithArgs(args, version)
916}
917
918func runWithArgs(args Args, version string) error {
919 if err := validateOrchestrationArgs(args); err != nil {
920 return err
921 }
922 ctx := context.Background()
923 switch args.Mode {
924 case ModePrint:
925 return runPrintMode(ctx, args, version)
926 case ModeStream:
927 return runStreamMode(ctx, args, version)
928 case ModeJSON:
929 return runJSONMode(ctx, args, version)
930 case ModeRPC:
931 return runRPCMode(ctx, args, version)
932 default:
933 return runInteractive(ctx, args, version)
934 }
935}
936
937// ---- print / json modes: require credentials, run single-shot ----
938
939// nonInteractiveExtHooks is the HostHooks impl used by print / json
940// modes. They have no TUI, so notify / display go to stderr and
941// submit / insert are no-ops (the extension can't steer a
942// single-shot run once it's in flight anyway).
943type nonInteractiveExtHooks struct{}
944
945func (nonInteractiveExtHooks) Notify(ext, level, message string) {
946 fmt.Fprintf(os.Stderr, "[%s] %s: %s\n", ext, level, message)
947}
948func (nonInteractiveExtHooks) Alert(string, extproto.AlertRequest) {}
949func (nonInteractiveExtHooks) Submit(string) {}
950func (nonInteractiveExtHooks) SubmitSlash(string) {}
951func (nonInteractiveExtHooks) Insert(string) {}
952func (nonInteractiveExtHooks) Display(string, string) {}
953func (nonInteractiveExtHooks) ClearNotes(string) {}
954func (nonInteractiveExtHooks) OpenPanel(string, extproto.PanelSpec) {}
955func (nonInteractiveExtHooks) UpdatePanel(string, string, string, []string, string) {}
956func (nonInteractiveExtHooks) ClosePanel(string, string) {}
957func (nonInteractiveExtHooks) SetStatus(string, string, string, string) {}
958func (nonInteractiveExtHooks) SetWidget(string, string, string, string, []string) {}
959func (nonInteractiveExtHooks) ClearWidget(string, string) {}
960
961// setupNonInteractiveExtensions loads --ext paths and (unless
962// --no-ext) runs discovery. Returns the manager so the caller can
963// wire tools into the resolved registry, and a cleanup closure to
964// defer. Mirrors the interactive-mode setup minus the TUI hooks.
965func setupNonInteractiveExtensions(ctx context.Context, args Args, r *Resolved, version string) (*extensions.Manager, func()) {
966 extMgr := extensions.New(ZutHome(), r.CWD, version, r.Provider, r.Model, nonInteractiveExtHooks{})
967 for _, e := range extMgr.LoadExplicit(ctx, args.Exts) {
968 fmt.Fprintln(os.Stderr, "extension load:", e)
969 }
970 if !args.NoExt {
971 for _, e := range extMgr.Discover(ctx) {
972 fmt.Fprintln(os.Stderr, "extension load:", e)
973 }
974 }
975 extMgr.WaitForReady(3 * time.Second)
976 r.MergeExtensionTools(&extToolAdapter{mgr: extMgr})
977 return extMgr, func() { extMgr.Stop(2 * time.Second) }
978}
979
980// wireNonInteractiveAgentExtHooks installs the same BeforeToolExecute
981// / BeforeTurn / BeforeAssistantMessage / OnEvent hooks the
982// interactive path wires up, so extensions get their normal
983// event-intercept surface in print / json / rpc flows too.
984func wireNonInteractiveAgentExtHooks(ctx context.Context, ag *core.Agent, extMgr *extensions.Manager) {
985 if ag == nil || extMgr == nil {
986 return
987 }
988 ag.BeforeToolExecute = func(call provider.ToolCallBlock) (bool, string, json.RawMessage) {
989 res := extMgr.InterceptToolCall(ctx, call.ID, call.Name, call.Arguments)
990 if res.Block {
991 return false, res.Reason, nil
992 }
993 return true, "", res.ModifiedArgs
994 }
995 ag.BeforeTurnContext = func(turnCtx context.Context, step int) (bool, string, string) {
996 res := extMgr.InterceptTurnStart(turnCtx, step)
997 return !res.Block, res.Reason, res.Context
998 }
999 ag.BeforeAssistantMessage = func(text string) (bool, string, string) {
1000 res := extMgr.InterceptAssistantMessage(ctx, text)
1001 if res.Block {
1002 return false, res.Reason, ""
1003 }
1004 return true, "", res.ReplaceText
1005 }
1006 ag.OnEvent = func(ev core.AgentEvent) { fanoutAgentEvent(extMgr, ev) }
1007}
1008
1009type printStats struct {
1010 Provider string `json:"provider"`
1011 Model string `json:"model"`
1012 PromptTokens int `json:"prompt_tokens"`
1013 ReasoningTokens *int `json:"reasoning_tokens"`
1014 GeneratedOutputTokens int `json:"generated_output_tokens"`
1015 ElapsedMS int64 `json:"elapsed_ms"`
1016}
1017
1018func writePrintStats(path, providerID, model string, usage provider.Usage, elapsed time.Duration) error {
1019 var reasoning *int
1020 generated := usage.OutputTokens
1021 if usage.ReasoningTokensKnown {
1022 count := usage.ReasoningTokens
1023 reasoning = &count
1024 generated -= count
1025 if generated < 0 {
1026 generated = 0
1027 }
1028 }
1029 stats := printStats{
1030 Provider: providerID,
1031 Model: model,
1032 PromptTokens: usage.InputTokens + usage.CacheReadTokens + usage.CacheWriteTokens,
1033 ReasoningTokens: reasoning,
1034 GeneratedOutputTokens: generated,
1035 ElapsedMS: elapsed.Milliseconds(),
1036 }
1037 data, err := json.MarshalIndent(stats, "", " ")
1038 if err != nil {
1039 return fmt.Errorf("encode stats: %w", err)
1040 }
1041 data = append(data, '\n')
1042 if err := os.WriteFile(path, data, 0o644); err != nil {
1043 return fmt.Errorf("write stats %q: %w", path, err)
1044 }
1045 return nil
1046}
1047
1048func runPrintMode(ctx context.Context, args Args, version string) (runErr error) {
1049 if args.Orchestrate {
1050 return runOrchestratedPrintMode(ctx, args, version)
1051 }
1052 if args.NoYolo {
1053 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in print mode (no interactive prompt available); tools will run without confirmation")
1054 }
1055 r, err := Resolve(args, true)
1056 if err != nil {
1057 return err
1058 }
1059 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
1060 defer stopExt()
1061
1062 ag := r.NewAgent()
1063 initialAg := ag
1064 defer func() {
1065 closeAgentLSP(ag)
1066 if ag != initialAg {
1067 closeAgentLSP(initialAg)
1068 }
1069 }()
1070 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
1071 sess, err := openOrCreateSession(ctx, args, r, ag, version)
1072 if err != nil {
1073 return err
1074 }
1075 if sess != nil {
1076 var providerName, model string
1077 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
1078 if err != nil {
1079 return err
1080 }
1081 r.Provider, r.Model = providerName, model
1082 ag.CommitToolResult = func(_ string, result core.ToolResult) error { return persistToolResultState(extMgr, sess, result) }
1083 defer func() { runErr = joinSessionCloseError(runErr, sess) }()
1084 }
1085 announceSession(extMgr, sess)
1086 wireRetryLifecyclePersistence(ag, sess)
1087 if sess != nil {
1088 defer func() { runErr = errors.Join(runErr, sess.FlushRetryLifecycle(ag.LastTurnUsage(), ag.Cost())) }()
1089 }
1090
1091 piped, _ := readAllStdin()
1092 prompt := combinePromptInput(piped, args.Prompt)
1093 if prompt == "" {
1094 return fmt.Errorf("print mode requires a prompt (arg or stdin)")
1095 }
1096
1097 start := len(ag.Messages())
1098 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, nil, os.Stderr); err != nil {
1099 return err
1100 }
1101 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
1102 return err
1103 }
1104 var persistCompaction func([]provider.Message) error
1105 if sess != nil {
1106 persistCompaction = sess.AppendCompaction
1107 }
1108 started := time.Now()
1109 usage, recovery, err := modes.RunPrintWithContextRecovery(ctx, ag, prompt, nil, os.Stdout, persistCompaction)
1110 elapsed := time.Since(started)
1111 transcriptStart := start
1112 if recovery.Compacted {
1113 transcriptStart = recovery.OutputStart
1114 }
1115 if persistErr := WriteNewTranscript(ag, sess, transcriptStart); persistErr != nil {
1116 if err != nil {
1117 return errors.Join(err, persistErr)
1118 }
1119 return persistErr
1120 }
1121 if err != nil {
1122 return err
1123 }
1124 if args.StatsPath != "" {
1125 return writePrintStats(args.StatsPath, r.Provider, r.Model, usage, elapsed)
1126 }
1127 return nil
1128}
1129
1130func runStreamMode(ctx context.Context, args Args, version string) (runErr error) {
1131 if args.Orchestrate {
1132 return runOrchestratedStreamMode(ctx, args, version)
1133 }
1134 if args.NoYolo {
1135 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in stream mode (no interactive prompt available); tools will run without confirmation")
1136 }
1137 r, err := Resolve(args, true)
1138 if err != nil {
1139 return err
1140 }
1141 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
1142 defer stopExt()
1143
1144 ag := r.NewAgent()
1145 initialAg := ag
1146 defer func() {
1147 closeAgentLSP(ag)
1148 if ag != initialAg {
1149 closeAgentLSP(initialAg)
1150 }
1151 }()
1152 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
1153 sess, err := openOrCreateSession(ctx, args, r, ag, version)
1154 if err != nil {
1155 return err
1156 }
1157 if sess != nil {
1158 var providerName, model string
1159 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
1160 if err != nil {
1161 return err
1162 }
1163 r.Provider, r.Model = providerName, model
1164 ag.CommitToolResult = func(_ string, result core.ToolResult) error { return persistToolResultState(extMgr, sess, result) }
1165 defer func() { runErr = joinSessionCloseError(runErr, sess) }()
1166 }
1167 announceSession(extMgr, sess)
1168 wireRetryLifecyclePersistence(ag, sess)
1169 if sess != nil {
1170 defer func() { runErr = errors.Join(runErr, sess.FlushRetryLifecycle(ag.LastTurnUsage(), ag.Cost())) }()
1171 }
1172
1173 piped, _ := readAllStdin()
1174 prompt := combinePromptInput(piped, args.Prompt)
1175 if prompt == "" {
1176 return fmt.Errorf("stream mode requires a prompt (arg or stdin)")
1177 }
1178
1179 start := len(ag.Messages())
1180 preSink, finishPre := newStreamTextSink(os.Stdout)
1181 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, preSink, os.Stderr); err != nil {
1182 finishPre()
1183 return err
1184 }
1185 finishPre()
1186 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
1187 return err
1188 }
1189 var persistCompaction func([]provider.Message) error
1190 if sess != nil {
1191 persistCompaction = sess.AppendCompaction
1192 }
1193 recovery, err := modes.RunStreamWithContextRecovery(ctx, ag, prompt, nil, os.Stdout, os.Stderr, persistCompaction)
1194 transcriptStart := start
1195 if recovery.Compacted {
1196 transcriptStart = recovery.OutputStart
1197 }
1198 if persistErr := WriteNewTranscript(ag, sess, transcriptStart); persistErr != nil {
1199 if err != nil {
1200 return errors.Join(err, persistErr)
1201 }
1202 return persistErr
1203 }
1204 return err
1205}
1206
1207func newStreamTextSink(out io.Writer) (func(core.AgentEvent), func()) {
1208 var streamed, wroteText, lastWasNL bool
1209 writeText := func(text string) {
1210 if text == "" {
1211 return
1212 }
1213 _, _ = fmt.Fprint(out, text)
1214 if syncer, ok := out.(interface{ Sync() error }); ok {
1215 _ = syncer.Sync()
1216 }
1217 wroteText = true
1218 lastWasNL = strings.HasSuffix(text, "\n")
1219 }
1220 sink := func(ev core.AgentEvent) {
1221 switch e := ev.(type) {
1222 case core.EvAssistantStart:
1223 streamed = false
1224 case core.EvTextDelta:
1225 streamed = true
1226 writeText(e.Delta)
1227 case core.EvAssistantMessage:
1228 if streamed {
1229 return
1230 }
1231 var text strings.Builder
1232 for _, content := range e.Message.Content {
1233 if block, ok := content.(provider.TextBlock); ok {
1234 if text.Len() > 0 {
1235 text.WriteString("\n")
1236 }
1237 text.WriteString(block.Text)
1238 }
1239 }
1240 writeText(text.String())
1241 }
1242 }
1243 finish := func() {
1244 if wroteText && !lastWasNL {
1245 writeText("\n")
1246 }
1247 }
1248 return sink, finish
1249}
1250
1251func runJSONMode(ctx context.Context, args Args, version string) (runErr error) {
1252 if args.Orchestrate {
1253 return runOrchestratedJSONMode(ctx, args, version)
1254 }
1255 if args.NoYolo {
1256 fmt.Fprintln(os.Stderr, "warning: --no-yolo has no effect in json mode (no interactive prompt available); tools will run without confirmation")
1257 }
1258 r, err := Resolve(args, true)
1259 if err != nil {
1260 return err
1261 }
1262 extMgr, stopExt := setupNonInteractiveExtensions(ctx, args, &r, version)
1263 defer stopExt()
1264
1265 ag := r.NewAgent()
1266 initialAg := ag
1267 defer func() {
1268 closeAgentLSP(ag)
1269 if ag != initialAg {
1270 closeAgentLSP(initialAg)
1271 }
1272 }()
1273 wireNonInteractiveAgentExtHooks(ctx, ag, extMgr)
1274 sess, err := openOrCreateSession(ctx, args, r, ag, version)
1275 if err != nil {
1276 return err
1277 }
1278 if sess != nil {
1279 var providerName, model string
1280 sess, ag, providerName, model, err = applyInitialSessionResume(ctx, args, r, extMgr, sess, ag)
1281 if err != nil {
1282 return err
1283 }
1284 r.Provider, r.Model = providerName, model
1285 ag.CommitToolResult = func(_ string, result core.ToolResult) error { return persistToolResultState(extMgr, sess, result) }
1286 defer func() { runErr = joinSessionCloseError(runErr, sess) }()
1287 }
1288 announceSession(extMgr, sess)
1289 wireRetryLifecyclePersistence(ag, sess)
1290 if sess != nil {
1291 defer func() { runErr = errors.Join(runErr, sess.FlushRetryLifecycle(ag.LastTurnUsage(), ag.Cost())) }()
1292 }
1293
1294 piped, _ := readAllStdin()
1295 prompt := combinePromptInput(piped, args.Prompt)
1296 if prompt == "" {
1297 return fmt.Errorf("json mode requires a prompt (arg or stdin)")
1298 }
1299
1300 start := len(ag.Messages())
1301 enc := json.NewEncoder(os.Stdout)
1302 preSink := func(ev core.AgentEvent) {
1303 _ = enc.Encode(modes.EventToJSON(ev))
1304 }
1305 if err := runZutfileStartupPre(ctx, args.StartupPre, r.CWD, r.Sandbox, ag, preSink, os.Stderr); err != nil {
1306 _ = enc.Encode(map[string]any{"type": "error", "message": err.Error()})
1307 return err
1308 }
1309 if err := reloadResourcesAfterStartupPre(ctx, args, extMgr, r.Sandbox, ag); err != nil {
1310 _ = enc.Encode(map[string]any{"type": "error", "message": err.Error()})
1311 return err
1312 }
1313 var persistCompaction func([]provider.Message) error
1314 if sess != nil {
1315 persistCompaction = sess.AppendCompaction
1316 }
1317 recovery, err := modes.RunJSONWithContextRecovery(ctx, ag, prompt, nil, os.Stdout, persistCompaction)
1318 transcriptStart := start
1319 if recovery.Compacted {
1320 transcriptStart = recovery.OutputStart
1321 }
1322 if persistErr := WriteNewTranscript(ag, sess, transcriptStart); persistErr != nil {
1323 finalErr := persistErr
1324 if err != nil {
1325 finalErr = errors.Join(err, persistErr)
1326 }
1327 _ = enc.Encode(map[string]any{"type": "error", "message": finalErr.Error()})
1328 return finalErr
1329 }
1330 return err
1331}
1332
1333// runZutfileStartupPre runs entry.pre before the main non-interactive prompt.
1334// "!command" values execute via BashTool; other values are sent as an agent turn.
1335// shellOut receives live shell chunks (typically os.Stderr); sink receives
1336// agent events for plain-text pre (stream mode wires a live text sink).
1337func runZutfileStartupPre(ctx context.Context, pre, cwd string, sandbox *tools.Sandbox, ag *core.Agent, sink func(core.AgentEvent), shellOut io.Writer) error {
1338 pre = strings.TrimSpace(pre)
1339 if pre == "" {
1340 return nil
1341 }
1342 if cmd, ok := modes.ShellEscapeCommand(pre); ok {
1343 raw, err := json.Marshal(map[string]any{
1344 "command": cmd,
1345 "timeout": modes.ShellEscapeTimeoutSeconds,
1346 })
1347 if err != nil {
1348 return err
1349 }
1350 if shellOut != nil {
1351 fmt.Fprintf(shellOut, "$ %s\n", cmd)
1352 if f, ok := shellOut.(interface{ Sync() error }); ok {
1353 _ = f.Sync()
1354 }
1355 }
1356 progress := func(chunk string) {
1357 if shellOut == nil || chunk == "" {
1358 return
1359 }
1360 fmt.Fprint(shellOut, chunk)
1361 if f, ok := shellOut.(interface{ Sync() error }); ok {
1362 _ = f.Sync()
1363 }
1364 }
1365 bash := &tools.BashTool{CWD: cwd, Sandbox: sandbox}
1366 res, err := bash.Execute(ctx, raw, progress)
1367 if err != nil {
1368 return fmt.Errorf("zutfile entry.pre: %w", err)
1369 }
1370 if res.IsError {
1371 var sb strings.Builder
1372 for _, c := range res.Content {
1373 if tb, ok := c.(provider.TextBlock); ok {
1374 sb.WriteString(tb.Text)
1375 }
1376 }
1377 msg := strings.TrimSpace(sb.String())
1378 if msg == "" {
1379 msg = "command failed"
1380 }
1381 return fmt.Errorf("zutfile entry.pre: %s", msg)
1382 }
1383 return nil
1384 }
1385 if ag == nil {
1386 return fmt.Errorf("zutfile entry.pre requires an agent for non-shell prompts")
1387 }
1388 if sink == nil {
1389 sink = func(core.AgentEvent) {}
1390 }
1391 return ag.Prompt(ctx, pre, nil, sink)
1392}
1393
1394var errInteractiveAgentChanged = errors.New("interactive agent or web-search policy changed during prompt refresh")
1395
1396// refreshAgentToolsAndPrompt re-resolves tools (including rediscovered
1397// skills and currently loaded extension tools) and updates the live
1398// agent's registry and system prompt. Used after /reload-ext and after
1399// zutfile entry.pre installs new skills or extensions.
1400// mutateRegistry, if non-nil, can inject session-specific tools (e.g. subagent_spawn).
1401// interactive, when non-nil, serializes the final commit with agent replacement.
1402func refreshAgentToolsAndPrompt(args Args, sharedSandbox *tools.Sandbox, extToolAdapter ExtensionToolSource, ag *core.Agent, mutateRegistry func(core.Registry) core.Registry, interactive *modes.Interactive) (subagents.WebSearchPolicy, error) {
1403 if ag == nil {
1404 return subagents.WebSearchDeny, nil
1405 }
1406 var webSearchPolicyGeneration uint64
1407 if interactive != nil {
1408 // Capture before Resolve: the final commit must fail if settings,
1409 // Telegram attachment, or a newer registry commit changes policy while
1410 // filesystem/config/extension discovery is in flight.
1411 webSearchPolicyGeneration = interactive.WebSearchPolicyGeneration()
1412 }
1413 resolved, err := Resolve(args, true)
1414 if err != nil {
1415 return subagents.WebSearchDeny, fmt.Errorf("refresh agent prompt and tools: %w", err)
1416 }
1417 if sharedSandbox != nil {
1418 resolved.UseSandbox(sharedSandbox)
1419 }
1420 if extToolAdapter != nil {
1421 resolved.MergeExtensionTools(extToolAdapter)
1422 }
1423 reg := resolved.ToolRegistry
1424 if resolved.WebSearchPolicy != subagents.WebSearchAllow {
1425 tools.RemoveWebCapabilities(reg)
1426 }
1427 if mutateRegistry != nil {
1428 reg = mutateRegistry(reg)
1429 }
1430 if interactive != nil {
1431 oldTools, applied := interactive.ApplyAgentPromptConfigAtWebSearchGeneration(ag, resolved.SystemPrompt, reg, webSearchPolicyGeneration)
1432 if !applied {
1433 _ = tools.CloseLSPManagers(reg)
1434 return subagents.WebSearchDeny, errInteractiveAgentChanged
1435 }
1436 interactive.DeferUntilIdle(func() {
1437 _ = tools.CloseLSPManagers(oldTools)
1438 })
1439 return webSearchPolicyForRegistry(resolved.WebSearchPolicy, ag.ToolsSnapshot()), nil
1440 }
1441 oldTools := ag.SetPromptConfig(resolved.SystemPrompt, reg)
1442 _ = tools.CloseLSPManagers(oldTools)
1443 return webSearchPolicyForRegistry(resolved.WebSearchPolicy, reg), nil
1444}
1445
1446func webSearchPolicyForRegistry(policy subagents.WebSearchPolicy, reg core.Registry) subagents.WebSearchPolicy {
1447 if policy != subagents.WebSearchAllow {
1448 return subagents.WebSearchDeny
1449 }
1450 for _, name := range tools.WebCapabilityNames {
1451 if _, ok := reg[name]; !ok {
1452 return subagents.WebSearchDeny
1453 }
1454 }
1455 return subagents.WebSearchAllow
1456}
1457
1458func webSearchToolAllowedForSession(args Args) bool {
1459 if args.NoTools || args.PermissionSet != nil {
1460 return false
1461 }
1462 if args.ToolsSet || len(args.Tools) > 0 {
1463 return toolListContains(args.Tools, "web_search")
1464 }
1465 return true
1466}
1467
1468func webSearchExplicitlyEnabledForSession(args Args) bool {
1469 return !args.NoTools && args.PermissionSet == nil && (args.ToolsSet || len(args.Tools) > 0) && toolListContains(args.Tools, "web_search")
1470}
1471
1472// reloadResourcesAfterStartupPre reloads extensions (if any) and
1473// refreshes the agent tool registry + system prompt so skills/extensions
1474// installed by entry.pre are visible to the following turn.
1475func reloadResourcesAfterStartupPre(ctx context.Context, args Args, extMgr *extensions.Manager, sharedSandbox *tools.Sandbox, ag *core.Agent) error {
1476 _, err := reloadResourcesAfterStartupPreWithRegistry(ctx, args, extMgr, sharedSandbox, ag, nil)
1477 return err
1478}
1479
1480func reloadResourcesAfterStartupPreWithRegistry(ctx context.Context, args Args, extMgr *extensions.Manager, sharedSandbox *tools.Sandbox, ag *core.Agent, mutateRegistry func(core.Registry) core.Registry) (subagents.WebSearchPolicy, error) {
1481 if strings.TrimSpace(args.StartupPre) == "" || ag == nil {
1482 return subagents.WebSearchDeny, nil
1483 }
1484 adapter := &extToolAdapter{mgr: extMgr}
1485 if extMgr != nil {
1486 _ = extMgr.Reload(ctx, 2*time.Second)
1487 }
1488 return refreshAgentToolsAndPrompt(args, sharedSandbox, adapter, ag, mutateRegistry, nil)
1489}
1490
1491// ---- interactive mode: opens the TUI even without credentials ----
1492
1493func interactiveQuickModelShortcuts(shortcuts []QuickModelShortcut) []modes.QuickModelShortcut {
1494 result := make([]modes.QuickModelShortcut, len(shortcuts))
1495 for idx, s := range shortcuts {
1496 p := normalizedModelProfile(s)
1497 result[idx] = modes.QuickModelShortcut{Provider: p.Provider, Model: p.Model, Reasoning: p.Reasoning, FastMode: p.FastMode}
1498 }
1499 return result
1500}
1501
1502func runInteractive(ctx context.Context, args Args, version string) (runErr error) {
1503 initialCfg, _ := LoadConfig()
1504 if initialCfg.Goals.MaxTokenBudget != nil && *initialCfg.Goals.MaxTokenBudget == 0 {
1505 return errors.New("goals.max_token_budget must be greater than zero")
1506 }
1507 // Resolve WITHOUT requiring credentials.
1508 r, err := Resolve(args, false)
1509 if err != nil {
1510 return err
1511 }
1512 // Resolve may have repaired a stale favorite. Use the saved repair for
1513 // the UI's active-profile comparison instead of the pre-resolution copy.
1514 if resolvedCfg, err := LoadConfig(); err == nil {
1515 initialCfg.QuickModelShortcuts = resolvedCfg.QuickModelShortcuts
1516 initialCfg.ActiveModelProfile = resolvedCfg.ActiveModelProfile
1517 }
1518
1519 authStore := AuthStoreFor()
1520 mgr := auth.NewManager(authStore)
1521 defer mgr.Close()
1522
1523 // Keep the sandbox pointer stable across agent rebuilds (login / model
1524 // switch). The Interactive UI toggles the lock via this pointer, and
1525 // rebuilt tool instances must share the same one so the lock sticks.
1526 sharedSandbox := r.Sandbox
1527
1528 // persistMu guards the active session and selection across the agent
1529 // loop, TUI callbacks, and session swaps. Declare it before tool
1530 // construction because subagent defaults must read the live selection too.
1531 var persistMu sync.Mutex
1532 // Serialize session transitions with persistence callbacks so a candidate
1533 // is read only after the old agent is flushed and cannot be overwritten by
1534 // an in-flight append before commit.
1535 var sessionTransitionMu sync.RWMutex
1536 activeProvider := r.Provider
1537 activeModel := r.Model
1538 var sess *core.Session
1539 scheduleEngine := scheduler.NewEngine(nil)
1540 var scheduledSessionMu sync.Mutex
1541 scheduledSessionLocks := make(map[string]*sync.Mutex)
1542 lockScheduledSession := func(sessionID string) func() {
1543 scheduledSessionMu.Lock()
1544 lock := scheduledSessionLocks[sessionID]
1545 if lock == nil {
1546 lock = new(sync.Mutex)
1547 scheduledSessionLocks[sessionID] = lock
1548 }
1549 scheduledSessionMu.Unlock()
1550 lock.Lock()
1551 return lock.Unlock
1552 }
1553
1554 // Build the extension manager BEFORE the agent so we can fold
1555 // extension-defined tools into the registry. Attach the interactive
1556 // host after constructing it below so startup alerts can be buffered.
1557 var iv *modes.Interactive
1558 extHooks := &interactiveExtHooks{}
1559 extMgr := extensions.New(ZutHome(), r.CWD, version, r.Provider, r.Model, extHooks)
1560 var startupExtensionErrors []string
1561 // --ext paths first so they win against installed extensions of
1562 // the same name (loadOne's first-write-wins semantics).
1563 for _, e := range extMgr.LoadExplicit(ctx, args.Exts) {
1564 startupExtensionErrors = append(startupExtensionErrors, e.Error())
1565 }
1566 // --no-ext skips the global + project-local discovery scan;
1567 // explicit --ext paths above are still honoured so you can run
1568 // "only this extension" with --no-ext --ext ./x.
1569 if !args.NoExt {
1570 for _, e := range extMgr.Discover(ctx) {
1571 startupExtensionErrors = append(startupExtensionErrors, e.Error())
1572 }
1573 }
1574 // Wait briefly for extensions to flush their initial register_tool
1575 // frames before we build the agent's tool registry. Half a second
1576 // is plenty for any extension that's actually well-behaved; ones
1577 // that don't send a ready frame eat the full grace and proceed.
1578 // 3s is the per-extension grace period for the ready frame.
1579 // Native binaries are instant; runtimes like `npx tsx` take ~1.5s
1580 // from cold cache. The wait is tight only for extensions that
1581 // haven't sent ready by then; ones that signalled earlier release
1582 // the wait immediately.
1583 extMgr.WaitForReady(3 * time.Second)
1584 defer extMgr.Stop(2 * time.Second)
1585
1586 extToolAdapter := &extToolAdapter{mgr: extMgr}
1587 r.MergeExtensionTools(extToolAdapter)
1588 webSearchGuard := &webSearchSessionGuard{}
1589
1590 // Keep the shared subagent runtime in the outer scope: session reloads,
1591 // dashboard updates, agent rebuilds, and shutdown all use the same owner.
1592 var runtime *subagentRuntime
1593 onResidentAccepted := func(spec subagents.ResidentChildSpec, turnID, _ string) {
1594 if iv != nil {
1595 iv.TrackResidentSubagent(spec.ID, turnID)
1596 }
1597 }
1598 onResidentCompletion := func(completion subagents.ResidentCompletion) {
1599 if iv != nil {
1600 iv.ReportResidentSubagent(completion)
1601 }
1602 }
1603 activeProviderForSubagents := func() string {
1604 persistMu.Lock()
1605 defer persistMu.Unlock()
1606 return activeProvider
1607 }
1608 activeModelForSubagents := func() string {
1609 persistMu.Lock()
1610 defer persistMu.Unlock()
1611 return activeModel
1612 }
1613
1614 runtime = newSubagentRuntime(subagentRuntimeConfig{
1615 Args: args,
1616 Root: filepath.Join(ZutHome(), "subagents"),
1617 RepoRoot: r.CWD,
1618 Provider: r.Provider,
1619 Model: r.Model,
1620 Reasoning: r.Reasoning,
1621 BaseURL: r.BaseURL,
1622 InsecureTLS: r.InsecureTLS,
1623 FastMode: r.FastMode,
1624 ContextWindow: r.ContextWindow,
1625 Policy: subagentPolicyFromConfig(initialCfg.Subagents),
1626 WebSearchPolicy: webSearchPolicyForRegistry(r.WebSearchPolicy, r.ToolRegistry),
1627 WebSearchGuard: webSearchGuard,
1628 ActiveProvider: activeProviderForSubagents,
1629 ActiveModel: activeModelForSubagents,
1630 OnResidentSpawned: onResidentAccepted,
1631 ResidentCompletion: onResidentCompletion,
1632 })
1633 reloadDone := make(chan struct{})
1634 var reloadErrs []error
1635 if resident := runtime.ResidentManager(); resident != nil {
1636 // Resident reconciliation reads only the new journal format. It marks
1637 // active durable work interrupted and exposes it for an explicit new
1638 // prompt; it never constructs a child or replays an accepted task.
1639 go func() {
1640 reloadErrs = resident.Reconcile()
1641 close(reloadDone)
1642 }()
1643 } else {
1644 close(reloadDone)
1645 }
1646 defer func() {
1647 <-reloadDone
1648 _ = closeSubagentRuntimeFresh(runtime)
1649 }()
1650
1651 prepareInteractiveRegistry := runtime.PrepareRegistry
1652 prepareResolvedInteractiveRegistry := runtime.PrepareResolvedRegistry
1653 prepareResolvedInteractiveRegistry(r.ToolRegistry, r.WebSearchPolicy)
1654 initialWebSearchPolicy := webSearchPolicyForRegistry(r.WebSearchPolicy, r.ToolRegistry)
1655 webSearchGuard.setAvailable(initialWebSearchPolicy == subagents.WebSearchAllow)
1656 runtime.SetWebSearchPolicy(initialWebSearchPolicy)
1657 resolveSubagent := runtime.resolveSubagent
1658
1659 // Confirmation gate: when --no-yolo is on, the agent must ask
1660 // the user before every tool call. In interactive mode the TUI
1661 // provides the Confirmer; in print/json/rpc modes there's no
1662 // way to prompt, so the gate is constructed with a nil inner
1663 // which auto-refuses every call with a helpful reason.
1664 var confirmGate *core.ConfirmGate
1665 if args.NoYolo {
1666 confirmGate = core.NewConfirmGate(nil) // set below for interactive
1667 }
1668
1669 // Capture current args in a closure so BuildAgent can re-resolve
1670 // after a successful login (picks up the newly stored credential).
1671 wireAgentExt := func(a *core.Agent) *core.Agent {
1672 if a == nil {
1673 return a
1674 }
1675 a.BeforeToolExecute = func(call provider.ToolCallBlock) (bool, string, json.RawMessage) {
1676 // Guards run before confirmation because they may rewrite the
1677 // arguments. The user must approve the effective call that will
1678 // actually execute, not the model's original arguments.
1679 r := extMgr.InterceptToolCall(ctx, call.ID, call.Name, call.Arguments)
1680 if r.Block {
1681 return false, r.Reason, nil
1682 }
1683 effectiveArgs := call.Arguments
1684 if len(r.ModifiedArgs) > 0 && json.Valid(r.ModifiedArgs) {
1685 effectiveArgs = r.ModifiedArgs
1686 }
1687 if confirmGate != nil {
1688 var content strings.Builder
1689 _, currentTools := a.PromptConfig()
1690 if tool, err := currentTools.Get(call.Name); err == nil {
1691 if previewer, ok := tool.(core.ToolPreviewer); ok {
1692 preview, err := previewer.Preview(ctx, effectiveArgs)
1693 if err != nil {
1694 return false, err.Error(), nil
1695 }
1696 for _, block := range preview.Content {
1697 if text, ok := block.(provider.TextBlock); ok {
1698 if content.Len() > 0 {
1699 content.WriteString("\n")
1700 }
1701 content.WriteString(text.Text)
1702 }
1703 }
1704 }
1705 }
1706 ok, reason, _ := confirmGate.CheckToolCall(core.ToolCallConfirmation{
1707 ID: call.ID,
1708 Name: call.Name,
1709 Summary: core.BuildPreview(effectiveArgs, 120),
1710 Content: content.String(),
1711 Origin: call.Origin,
1712 })
1713 if !ok {
1714 return false, reason, nil
1715 }
1716 }
1717 return true, "", r.ModifiedArgs
1718 }
1719 a.BeforeTurnContext = func(turnCtx context.Context, step int) (bool, string, string) {
1720 r := extMgr.InterceptTurnStart(turnCtx, step)
1721 return !r.Block, r.Reason, r.Context
1722 }
1723 a.BeforeAssistantMessage = func(text string) (bool, string, string) {
1724 r := extMgr.InterceptAssistantMessage(ctx, text)
1725 if r.Block {
1726 return false, r.Reason, ""
1727 }
1728 return true, "", r.ReplaceText
1729 }
1730 a.OnEvent = func(ev core.AgentEvent) { fanoutAgentEvent(extMgr, ev) }
1731 runtime.WireRequiredWorkerGate(a)
1732 return a
1733 }
1734
1735 scheduleTool := &tools.ScheduleTool{
1736 Engine: scheduleEngine,
1737 SessionID: func() string {
1738 persistMu.Lock()
1739 defer persistMu.Unlock()
1740 if sess == nil {
1741 return ""
1742 }
1743 return sess.ID
1744 },
1745 Location: func() *time.Location { return time.Local },
1746 }
1747 schedulerAllowed := !args.NoTools && (!args.ToolsSet && len(args.Tools) == 0 || toolListContains(args.Tools, tools.ScheduleToolName))
1748 installSchedulerTool := func(registry core.Registry) core.Registry {
1749 if schedulerAllowed {
1750 registry[tools.ScheduleToolName] = scheduleTool
1751 }
1752 return registry
1753 }
1754 installSchedulerTool(r.ToolRegistry)
1755 prepareInteractiveRegistryWithScheduler := func(registry core.Registry) core.Registry {
1756 return prepareInteractiveRegistry(installSchedulerTool(registry))
1757 }
1758
1759 var ag *core.Agent
1760 buildAgent := func() (*core.Agent, string, string, error) {
1761 resolved, err := Resolve(args, true)
1762 if err != nil {
1763 return nil, "", "", err
1764 }
1765 resolved.UseSandbox(sharedSandbox)
1766 runtime.SetProvider(resolved.Provider)
1767 runtime.SetModel(resolved.Model)
1768 runtime.SetContextWindow(resolved.ContextWindow)
1769 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1770 runtime.SetFastMode(resolved.FastMode)
1771 resolved.MergeExtensionTools(extToolAdapter)
1772 installSchedulerTool(resolved.ToolRegistry)
1773 prepareResolvedInteractiveRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
1774 return wireAgentExt(resolved.newInteractiveAgent()), resolved.Provider, resolved.Model, nil
1775 }
1776
1777 // Rebuild agent with an explicit provider/model override.
1778 buildAgentFor := func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1779 next := args
1780 if providerOverride != "" {
1781 next.Provider = providerOverride
1782 }
1783 if modelOverride != "" {
1784 next.Model = modelOverride
1785 }
1786 resolved, err := Resolve(next, true)
1787 if err != nil {
1788 return nil, "", "", err
1789 }
1790 resolved.UseSandbox(sharedSandbox)
1791 runtime.SetProvider(resolved.Provider)
1792 runtime.SetModel(resolved.Model)
1793 runtime.SetContextWindow(resolved.ContextWindow)
1794 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1795 runtime.SetFastMode(resolved.FastMode)
1796 resolved.MergeExtensionTools(extToolAdapter)
1797 installSchedulerTool(resolved.ToolRegistry)
1798 prepareResolvedInteractiveRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
1799 return wireAgentExt(resolved.newInteractiveAgent()), resolved.Provider, resolved.Model, nil
1800 }
1801
1802 // Rebuild agent for the rescue picker after a recoverable failure.
1803 // Unlike buildAgentFor, this drops launch-time --api-key and
1804 // --base-url overrides because those are typically the cause of the
1805 // rescue (a bad key, a typo'd base URL, or a corporate gateway that
1806 // only the originally-picked provider needed). Re-resolving without
1807 // them lets the rescue retry use env vars / auth.json / provider
1808 // defaults the way zut would have without the overrides.
1809 buildAgentForRescue := func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
1810 next := args
1811 next.APIKey = ""
1812 next.BaseURL = ""
1813 if providerOverride != "" {
1814 next.Provider = providerOverride
1815 }
1816 if modelOverride != "" {
1817 next.Model = modelOverride
1818 }
1819 resolved, err := Resolve(next, true)
1820 if err != nil {
1821 return nil, "", "", err
1822 }
1823 resolved.UseSandbox(sharedSandbox)
1824 runtime.SetProvider(resolved.Provider)
1825 runtime.SetModel(resolved.Model)
1826 runtime.SetContextWindow(resolved.ContextWindow)
1827 runtime.SetProviderSettings(resolved.BaseURL, resolved.InsecureTLS)
1828 runtime.SetFastMode(resolved.FastMode)
1829 resolved.MergeExtensionTools(extToolAdapter)
1830 installSchedulerTool(resolved.ToolRegistry)
1831 prepareResolvedInteractiveRegistry(resolved.ToolRegistry, resolved.WebSearchPolicy)
1832 return wireAgentExt(resolved.newInteractiveAgent()), resolved.Provider, resolved.Model, nil
1833 }
1834
1835 if r.HasCredential() {
1836 ag = wireAgentExt(r.newInteractiveAgent())
1837 }
1838
1839 // /reload-ext callback: after the manager has respawned every
1840 // extension, re-resolve the tool registry (built-ins + freshly-
1841 // registered extension tools) and swap it onto the current
1842 // agent in-place. The current agent may have been replaced by a
1843 // /model swap since spawn, so re-read the live `ag` on each
1844 // invocation.
1845 extMgr.SetOnReload(func() {
1846 current := liveInteractiveAgent(iv, ag)
1847 if current == nil {
1848 return
1849 }
1850 if _, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistryWithScheduler, iv); err != nil && iv != nil {
1851 iv.ReportError(err)
1852 }
1853 })
1854
1855 var sessBaselineMsgs int // messages already on disk when current session opened
1856 var sessionTitlePending bool
1857 if !args.NoSess && ag != nil {
1858 var sessErr error
1859 sess, sessErr = openOrCreateSession(ctx, args, r, ag, version)
1860 if sessErr != nil {
1861 return sessErr
1862 }
1863 sessBaselineMsgs = len(ag.Messages())
1864 if sess != nil {
1865 // Startup resume uses the same provider/model-aware preparation as
1866 // the interactive session picker. This matters for --continue,
1867 // --resume, and explicit --session paths whose latest meta row was
1868 // written by another provider/model.
1869 candidate, resumeErr := applySessionResume(sess, ag, r.Provider, r.Model,
1870 strings.TrimSpace(args.Provider) != "", strings.TrimSpace(args.Model) != "", buildAgentFor)
1871 if resumeErr != nil {
1872 return resumeErr
1873 }
1874 sess = candidate.session
1875 ag = candidate.agent
1876 sessBaselineMsgs = candidate.fullMessageCount
1877 activeProvider = candidate.provider
1878 activeModel = candidate.model
1879 r.Provider = candidate.provider
1880 r.Model = candidate.model
1881 }
1882 if sess != nil && ag != nil {
1883 sessionTitlePending = sess.Meta.Parent != "" && sess.Title == "" && len(ag.Messages()) <= sess.Meta.ForkPoint
1884 }
1885 }
1886 announceSession(extMgr, sess)
1887 // Print the hint after the session close defer below and all terminal/TUI
1888 // cleanup defers. Close removes a fresh empty session, so only a session
1889 // that remains discoverable through the hinted command gets a hint.
1890 defer func() {
1891 if !iv.ExitedViaCtrlC() {
1892 return
1893 }
1894 persistMu.Lock()
1895 current := sess
1896 persistMu.Unlock()
1897 hasMessages := false
1898 if finalAg := iv.Agent(); finalAg != nil {
1899 hasMessages = finalAg.MessageCount() > 0
1900 }
1901 if resumeID := resumableSessionID(ZutHome(), current, hasMessages); resumeID != "" {
1902 fmt.Print(resumeSessionHint(resumeID))
1903 }
1904 }()
1905 defer func() {
1906 persistMu.Lock()
1907 defer persistMu.Unlock()
1908 runErr = joinSessionCloseError(runErr, sess)
1909 }()
1910
1911 // persistMessage is the per-message hook bound to the agent. It
1912 // appends each new transcript message to the live session as soon
1913 // as it lands, so a kill / closed terminal / OS crash costs at
1914 // most the in-flight turn instead of the whole session. The
1915 // baseline counter advances in lock-step so the exit-time flush
1916 // doesn't double-write rows already on disk.
1917 persistMessage := func(m provider.Message) {
1918 sessionTransitionMu.RLock()
1919 defer sessionTransitionMu.RUnlock()
1920 persistMu.Lock()
1921 defer persistMu.Unlock()
1922 if sess == nil {
1923 return
1924 }
1925 if err := sess.AppendMessage(m); err == nil {
1926 sessBaselineMsgs++
1927 }
1928 }
1929 persistUsage := func(cum provider.Usage) {
1930 sessionTransitionMu.RLock()
1931 defer sessionTransitionMu.RUnlock()
1932 persistMu.Lock()
1933 defer persistMu.Unlock()
1934 if sess == nil {
1935 return
1936 }
1937 _ = sess.AppendUsage(cum, cum)
1938 }
1939 persistRetryLifecycle := func(record core.RetryLifecycleRecord) {
1940 sessionTransitionMu.RLock()
1941 defer sessionTransitionMu.RUnlock()
1942 persistMu.Lock()
1943 defer persistMu.Unlock()
1944 if sess != nil {
1945 sess.RecordRetryLifecycle(record)
1946 }
1947 }
1948 persistCompaction := func(messages []provider.Message) {
1949 sessionTransitionMu.RLock()
1950 var session *extproto.SessionContext
1951 var states map[string]json.RawMessage
1952 persistMu.Lock()
1953 if sess != nil {
1954 if err := sess.AppendCompaction(messages); err == nil {
1955 sessBaselineMsgs = len(messages)
1956 session = sessionContext(sess)
1957 states = copyExtensionStates(sess.ExtensionState)
1958 }
1959 }
1960 persistMu.Unlock()
1961 sessionTransitionMu.RUnlock()
1962 if session != nil {
1963 extMgr.EmitSessionEvent("session_compacted", session, states)
1964 }
1965 }
1966 persistCompactHandoff := func(state json.RawMessage) error {
1967 sessionTransitionMu.RLock()
1968 defer sessionTransitionMu.RUnlock()
1969 persistMu.Lock()
1970 defer persistMu.Unlock()
1971 if sess == nil {
1972 return nil
1973 }
1974 return sess.UpdateCompactHandoff(state)
1975 }
1976 currentCompactHandoff := func() json.RawMessage {
1977 persistMu.Lock()
1978 defer persistMu.Unlock()
1979 if sess == nil {
1980 return nil
1981 }
1982 return append(json.RawMessage(nil), sess.Meta.CompactHandoff...)
1983 }
1984 persistGoal := func(goal *core.SessionGoal) error {
1985 sessionTransitionMu.RLock()
1986 defer sessionTransitionMu.RUnlock()
1987 persistMu.Lock()
1988 defer persistMu.Unlock()
1989 if sess == nil {
1990 return errors.New("session persistence is disabled")
1991 }
1992 return sess.UpdateGoal(goal)
1993 }
1994 persistGoalRuntime := func(goal *core.SessionGoal) error {
1995 sessionTransitionMu.RLock()
1996 defer sessionTransitionMu.RUnlock()
1997 persistMu.Lock()
1998 defer persistMu.Unlock()
1999 if sess == nil {
2000 return errors.New("session persistence is disabled")
2001 }
2002 return sess.UpdateGoalRuntime(goal)
2003 }
2004 ensureMission := func(objective string) error {
2005 sessionTransitionMu.RLock()
2006 defer sessionTransitionMu.RUnlock()
2007 persistMu.Lock()
2008 defer persistMu.Unlock()
2009 if sess == nil {
2010 return errors.New("session persistence is disabled")
2011 }
2012 return sess.EnsureMission(objective, core.MissionSourceUser)
2013 }
2014 currentGoal := func() *core.SessionGoal {
2015 persistMu.Lock()
2016 defer persistMu.Unlock()
2017 if sess == nil || sess.Meta.Goal == nil {
2018 return nil
2019 }
2020 goal := *sess.Meta.Goal
2021 return &goal
2022 }
2023 currentGoalHistory := func() []core.SessionGoal {
2024 persistMu.Lock()
2025 defer persistMu.Unlock()
2026 if sess == nil {
2027 return nil
2028 }
2029 return append([]core.SessionGoal(nil), sess.Meta.GoalHistory...)
2030 }
2031 bindAgentToolResultSession := func(a *core.Agent, boundSession *core.Session) {
2032 if a == nil {
2033 return
2034 }
2035 a.CommitToolResult = func(_ string, result core.ToolResult) error {
2036 persistMu.Lock()
2037 defer persistMu.Unlock()
2038 return persistToolResultState(extMgr, boundSession, result, initialCfg.Goals.MaxTokenBudget)
2039 }
2040 }
2041 wireAgentPersist := func(a *core.Agent) *core.Agent {
2042 if a == nil {
2043 return a
2044 }
2045 persistMu.Lock()
2046 currentSession := sess
2047 persistMu.Unlock()
2048 if currentSession != nil {
2049 a.SetSessionTimeContext(currentSession.Meta.Started, currentSession.Meta.Timezone, currentSession.Meta.TimezoneOffset)
2050 }
2051 a.OnMessageAppended = persistMessage
2052 a.OnUsage = persistUsage
2053 a.OnRetryLifecycle = persistRetryLifecycle
2054 a.OnTranscriptCompacted = persistCompaction
2055 bindAgentToolResultSession(a, currentSession)
2056 return a
2057 }
2058 wireAgentPersist(ag)
2059 defer func() {
2060 closeAgentLSP(liveInteractiveAgent(iv, ag))
2061 closeResolvedLSP(r)
2062 }()
2063
2064 // Re-wrap the build closures so any agent constructed by the TUI
2065 // (login, /model swap to a different provider) also gets the
2066 // persistence hooks. Without this, switching provider would
2067 // silently revert to the old in-memory-only behaviour. Selection state
2068 // is published by the successful transition itself, not by preparation.
2069 baseBuildAgent := buildAgent
2070 buildAgent = func() (*core.Agent, string, string, error) {
2071 a, p, m, err := baseBuildAgent()
2072 return wireAgentPersist(a), p, m, err
2073 }
2074 baseBuildAgentFor := buildAgentFor
2075 buildAgentFor = func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
2076 a, p, m, err := baseBuildAgentFor(providerOverride, modelOverride)
2077 return wireAgentPersist(a), p, m, err
2078 }
2079 baseBuildAgentForRescue := buildAgentForRescue
2080 buildAgentForRescue = func(providerOverride, modelOverride string) (*core.Agent, string, string, error) {
2081 a, p, m, err := baseBuildAgentForRescue(providerOverride, modelOverride)
2082 return wireAgentPersist(a), p, m, err
2083 }
2084
2085 // loadSession replaces the current session with the one at path and
2086 // hands its messages to the agent. Used by the /sessions picker.
2087 loadSessionContext := func(loadCtx context.Context, path string) (loadErr error) {
2088 if err := loadCtx.Err(); err != nil {
2089 return err
2090 }
2091 selectedMeta, err := core.ManagedSessionMeta(loadCtx, agentSessionsRoot(ZutHome(), args), path)
2092 if err != nil {
2093 return fmt.Errorf("validate selected session: %w", err)
2094 }
2095 if info, statErr := os.Stat(selectedMeta.CWD); statErr != nil || !info.IsDir() {
2096 if statErr != nil {
2097 return fmt.Errorf("selected session cwd: %w", statErr)
2098 }
2099 return fmt.Errorf("selected session cwd is not a directory: %s", selectedMeta.CWD)
2100 }
2101 // Hold the transition lock from the pre-flush through the commit.
2102 // Persistence callbacks take the read side, so an active session
2103 // cannot be snapshotted before its lazy writes land or overwritten by
2104 // a callback while the candidate is being installed.
2105 if err := loadCtx.Err(); err != nil {
2106 return err
2107 }
2108 sessionTransitionMu.Lock()
2109 defer sessionTransitionMu.Unlock()
2110 if err := loadCtx.Err(); err != nil {
2111 return err
2112 }
2113 workspaceChanged := filepath.Clean(selectedMeta.CWD) != filepath.Clean(args.CWD)
2114
2115 currentAg := liveInteractiveAgent(iv, ag)
2116 if currentAg == nil {
2117 return fmt.Errorf("no agent running; log in first")
2118 }
2119
2120 persistMu.Lock()
2121 currentProvider := activeProvider
2122 currentModel := activeModel
2123 oldSess := sess
2124 // Flush before reading the candidate. Use the locked form rather
2125 // than the public callback, which would acquire the read lock held
2126 // by this transition.
2127 if oldSess != nil {
2128 next, flushErr := writeNewTranscriptLocked(currentAg, oldSess, sessBaselineMsgs)
2129 sessBaselineMsgs = next
2130 if flushErr != nil {
2131 persistMu.Unlock()
2132 return fmt.Errorf("flush current session: %w", flushErr)
2133 }
2134 }
2135 currentMessageCount := len(currentAg.Messages())
2136 currentCost := currentAg.Cost()
2137 persistMu.Unlock()
2138
2139 // A candidate build must not publish its provider/model as the live
2140 // selection before the candidate commits. The builder also stages
2141 // provider settings on the shared runtime, so restore those settings on
2142 // every failed path, including errors returned during preparation.
2143 runtimeConfig := runtime.snapshotConfiguration()
2144 oldCWD := args.CWD
2145 oldResolvedCWD := r.CWD
2146 oldPermissionSet := args.PermissionSet
2147 oldSandboxRoot := ""
2148 oldSandboxLocked := false
2149 if sharedSandbox != nil {
2150 oldSandboxRoot = sharedSandbox.Root
2151 oldSandboxLocked = sharedSandbox.Locked()
2152 }
2153 rollbackWorkspace := func() {
2154 if !workspaceChanged {
2155 return
2156 }
2157 args.CWD = oldCWD
2158 r.CWD = oldResolvedCWD
2159 args.PermissionSet = oldPermissionSet
2160 runtime.SetRepoRoot(oldResolvedCWD)
2161 if sharedSandbox != nil {
2162 sharedSandbox.Root = oldSandboxRoot
2163 if oldSandboxLocked {
2164 sharedSandbox.Lock()
2165 } else {
2166 sharedSandbox.Unlock()
2167 }
2168 }
2169 }
2170 if workspaceChanged {
2171 args.CWD = selectedMeta.CWD
2172 r.CWD = selectedMeta.CWD
2173 runtime.SetRepoRoot(selectedMeta.CWD)
2174 if args.PermissionSet != nil {
2175 expanded := args.PermissionSet.Expand(selectedMeta.CWD, args.AgentDataDir)
2176 args.PermissionSet = &expanded
2177 }
2178 if sharedSandbox != nil {
2179 sharedSandbox.Root = selectedMeta.CWD
2180 if oldSandboxLocked {
2181 sharedSandbox.Lock()
2182 } else {
2183 sharedSandbox.Unlock()
2184 }
2185 }
2186 }
2187 committed := false
2188 var candidate sessionResumeCandidate
2189 defer func() {
2190 if !committed {
2191 rollbackWorkspace()
2192 runtime.restoreConfiguration(runtimeConfig)
2193 loadErr = joinSessionCloseError(loadErr, candidate.session)
2194 }
2195 }()
2196 if workspaceChanged {
2197 candidate, err = prepareSessionResumeForWorkspace(path, currentAg, currentProvider, currentModel, baseBuildAgentFor)
2198 } else {
2199 candidate, err = prepareSessionResume(path, currentAg, currentProvider, currentModel, baseBuildAgentFor)
2200 }
2201 if err != nil {
2202 // prepareSessionResume closes its append handle on failure;
2203 // no live agent or session has been changed.
2204 return err
2205 }
2206
2207 // Wire the private candidate before it can become visible. This is
2208 // also required for legacy same-provider resumes, where the current
2209 // agent is reused and only its transcript/usage are refreshed.
2210 wireAgentPersist(candidate.agent)
2211
2212 if err := loadCtx.Err(); err != nil {
2213 return err
2214 }
2215 persistMu.Lock()
2216 // A provider rebuild ran outside persistMu. Refuse to install it if
2217 // the live agent, session, selection, transcript, or cost changed in
2218 // the meantime; otherwise a slow resume could discard a newer turn or
2219 // model swap.
2220 live := liveInteractiveAgent(iv, ag)
2221 changed := sess != oldSess || activeProvider != currentProvider || activeModel != currentModel || live != currentAg
2222 if !changed && live != nil {
2223 changed = len(live.Messages()) != currentMessageCount || live.Cost() != currentCost
2224 }
2225 if changed {
2226 persistMu.Unlock()
2227 return fmt.Errorf("session changed while loading; please try again")
2228 }
2229 newStates := copyExtensionStates(candidate.session.ExtensionState)
2230 var oldCloseErr error
2231 if oldSess != nil {
2232 oldCloseErr = oldSess.Close()
2233 }
2234 sess = candidate.session
2235 bindAgentToolResultSession(candidate.agent, candidate.session)
2236 candidate.agent.SetSessionTimeContext(candidate.session.Meta.Started, candidate.session.Meta.Timezone, candidate.session.Meta.TimezoneOffset)
2237 sessionTitlePending = candidate.session != nil && candidate.session.Meta.Parent != "" && candidate.session.Title == "" && candidate.fullMessageCount <= candidate.session.Meta.ForkPoint
2238 // The live agent only receives a compact resume window, but the
2239 // session file remains intact. Keep the persistence baseline at
2240 // the original on-disk message count so future turns append after
2241 // the full session instead of duplicating the hydrated tail.
2242 sessBaselineMsgs = candidate.fullMessageCount
2243
2244 if candidate.rebuilt {
2245 // Commit the TUI agent while persistMu still protects the session
2246 // writer, so no new message can land on the old file between the
2247 // two state changes.
2248 if iv != nil {
2249 if workspaceChanged {
2250 iv.ApplySessionAgentWithCWD(candidate.agent, candidate.provider, candidate.model, selectedMeta.CWD, candidate.session.Meta.CompactHandoff)
2251 } else {
2252 iv.ApplySessionAgentWithCompactHandoff(candidate.agent, candidate.provider, candidate.model, candidate.session.Meta.CompactHandoff)
2253 }
2254 }
2255 ag = candidate.agent
2256 } else {
2257 currentAg.SetMessages(candidate.messages)
2258 currentAg.SeedCost(candidate.cumulative)
2259 currentAg.SeedLastTurnUsage(candidate.lastTurn)
2260 ag = currentAg
2261 }
2262 activeProvider = candidate.provider
2263 activeModel = candidate.model
2264 if candidate.session != nil {
2265 // Keep the resident parent's session association in the same commit
2266 // as the session, agent, usage, and persistence baseline.
2267 runtime.SetActiveSession(candidate.session.ID)
2268 if iv != nil {
2269 iv.SetSubagentSessionScope(candidate.session.ID)
2270 }
2271 }
2272 committed = true
2273 persistMu.Unlock()
2274 if iv != nil {
2275 iv.RefreshGoal()
2276 }
2277 if candidate.session.Meta.Parent != "" {
2278 extMgr.EmitSessionEvent("session_forked", sessionContext(candidate.session), newStates)
2279 }
2280 extMgr.EmitSessionEvent("session_switched", sessionContext(candidate.session), newStates)
2281 if oldCloseErr != nil {
2282 return fmt.Errorf("close current session: %w", oldCloseErr)
2283 }
2284 return nil
2285 }
2286 loadSession := func(path string) error {
2287 return loadSessionContext(context.Background(), path)
2288 }
2289
2290 // changeCWD switches the running session to a new working directory.
2291 // Wired into InteractiveConfig.ChangeCWD and invoked by the hidden
2292 // /cd slash command (which itself is only fired by the workspaces
2293 // extension's panel-key Enter handler today; the user can type /cd
2294 // directly but it's not in autocomplete / help / the README).
2295 //
2296 // Steps, in order:
2297 // 1. resolve + validate the new path (~ expansion, abs/rel)
2298 // 2. stage the candidate cwd, sandbox, and subagent state
2299 // 3. rebuild the agent and allocate its new session
2300 // 4. commit all new state together, closing the old session last
2301 // 5. push the committed state into the running Interactive
2302 //
2303 // The /jail state is preserved verbatim: if the sandbox was locked
2304 // to the old cwd, it stays locked, just re-pointed at the new one.
2305 changeCWD := func(path string) error {
2306 sessionTransitionMu.Lock()
2307 defer sessionTransitionMu.Unlock()
2308 if path == "" {
2309 return fmt.Errorf("empty path")
2310 }
2311 // ~ expansion.
2312 if path == "~" || strings.HasPrefix(path, "~/") {
2313 home, herr := os.UserHomeDir()
2314 if herr != nil || home == "" {
2315 return fmt.Errorf("cannot expand ~: %v", herr)
2316 }
2317 if path == "~" {
2318 path = home
2319 } else {
2320 path = filepath.Join(home, path[2:])
2321 }
2322 }
2323 if !filepath.IsAbs(path) {
2324 path = filepath.Join(args.CWD, path)
2325 }
2326 absPath, err := filepath.Abs(path)
2327 if err != nil {
2328 return err
2329 }
2330 info, err := os.Stat(absPath)
2331 if err != nil {
2332 return err
2333 }
2334 if !info.IsDir() {
2335 return fmt.Errorf("not a directory: %s", absPath)
2336 }
2337
2338 currentAg := liveInteractiveAgent(iv, ag)
2339 if currentAg == nil {
2340 return fmt.Errorf("no agent running; log in first")
2341 }
2342
2343 // Stage the candidate state while retaining a complete rollback
2344 // snapshot. A failed rebuild or session allocation must leave the
2345 // current agent, session, sandbox, and subagent root usable.
2346 oldCWD := args.CWD
2347 oldResolvedCWD := r.CWD
2348 oldPermissionSet := args.PermissionSet
2349 persistMu.Lock()
2350 oldActiveProvider := activeProvider
2351 oldActiveModel := activeModel
2352 persistMu.Unlock()
2353 runtimeConfig := runtime.snapshotConfiguration()
2354 oldSandboxRoot := ""
2355 oldSandboxLocked := false
2356 if sharedSandbox != nil {
2357 oldSandboxRoot = sharedSandbox.Root
2358 oldSandboxLocked = sharedSandbox.Locked()
2359 }
2360 rollback := func() {
2361 args.CWD = oldCWD
2362 r.CWD = oldResolvedCWD
2363 args.PermissionSet = oldPermissionSet
2364 persistMu.Lock()
2365 activeProvider = oldActiveProvider
2366 activeModel = oldActiveModel
2367 persistMu.Unlock()
2368 runtime.restoreConfiguration(runtimeConfig)
2369 if sharedSandbox != nil {
2370 sharedSandbox.Root = oldSandboxRoot
2371 if oldSandboxLocked {
2372 sharedSandbox.Lock()
2373 } else {
2374 sharedSandbox.Unlock()
2375 }
2376 }
2377 }
2378
2379 args.CWD = absPath
2380 r.CWD = absPath
2381 runtime.SetRepoRoot(absPath)
2382 if args.PermissionSet != nil {
2383 expanded := args.PermissionSet.Expand(absPath, args.AgentDataDir)
2384 args.PermissionSet = &expanded
2385 }
2386 if sharedSandbox != nil {
2387 sharedSandbox.Root = absPath
2388 if oldSandboxLocked {
2389 sharedSandbox.Lock()
2390 } else {
2391 sharedSandbox.Unlock()
2392 }
2393 }
2394
2395 // Rebuild the agent so tools / AGENTS.md / system prompt
2396 // re-bind to the new cwd. buildAgent() reads from args + r.
2397 newAg, newProvider, newModel, berr := buildAgent()
2398 if berr != nil {
2399 rollback()
2400 return fmt.Errorf("rebuild agent: %w", berr)
2401 }
2402
2403 // Fresh session in the new cwd's bucket. We bypass
2404 // openOrCreateSession's --continue / --resume branches
2405 // because /cd's semantics are "start fresh here", matching
2406 // what relaunching `zut --cwd <path>` would do today.
2407 var newSess *core.Session
2408 if !args.NoSess {
2409 newRoot := agentSessionsRoot(ZutHome(), args)
2410 core.PruneEmptySessions(newRoot, absPath)
2411 var serr error
2412 newSess, serr = core.NewSession(newRoot, absPath, newProvider, newModel, version)
2413 if serr != nil {
2414 rollback()
2415 return fmt.Errorf("open session in %s: %w", absPath, serr)
2416 }
2417 }
2418
2419 // Invalidate any title request before swapping the host-owned session
2420 // pointer. The interactive state reset below happens after the swap,
2421 // so this guard closes the window where a late result could otherwise
2422 // be written to the new session.
2423 if iv != nil {
2424 iv.CancelPendingSessionTitle()
2425 }
2426
2427 // Commit only after every fallible operation has succeeded. Close
2428 // the old session last so rollback never has to resurrect it.
2429 var newStates map[string]json.RawMessage
2430 var oldCloseErr error
2431 persistMu.Lock()
2432 if sess != nil {
2433 next, flushErr := writeNewTranscriptLocked(currentAg, sess, sessBaselineMsgs)
2434 sessBaselineMsgs = next
2435 if flushErr != nil {
2436 persistMu.Unlock()
2437 rollbackErr := joinSessionCloseError(fmt.Errorf("flush current session: %w", flushErr), newSess)
2438 rollback()
2439 return rollbackErr
2440 }
2441 oldCloseErr = sess.Close()
2442 }
2443 sess = newSess
2444 bindAgentToolResultSession(newAg, newSess)
2445 if newSess != nil {
2446 newAg.SetSessionTimeContext(newSess.Meta.Started, newSess.Meta.Timezone, newSess.Meta.TimezoneOffset)
2447 newStates = copyExtensionStates(newSess.ExtensionState)
2448 }
2449 sessBaselineMsgs = 0
2450 sessionTitlePending = false
2451 activeProvider = newProvider
2452 activeModel = newModel
2453 persistMu.Unlock()
2454 ag = newAg
2455 closeAgentLSP(currentAg)
2456
2457 // Push the new state into the running Interactive.
2458 if iv != nil {
2459 startupPaths := instructionContextPaths(loadAgentsContext(absPath, ZutHome()))
2460 iv.ApplyChangedCWDWithStartupContext(newAg, newProvider, newModel, absPath, startupPaths)
2461 iv.RefreshGoal()
2462 }
2463
2464 // Re-scope the subagent dashboard to the new session.
2465 if newSess != nil {
2466 runtime.SetActiveSession(newSess.ID)
2467 if iv != nil {
2468 iv.SetSubagentSessionScope(newSess.ID)
2469 }
2470 }
2471 if newSess != nil {
2472 extMgr.EmitSessionEvent("session_opened", sessionContext(newSess), newStates)
2473 }
2474 if oldCloseErr != nil {
2475 return fmt.Errorf("close current session: %w", oldCloseErr)
2476 }
2477 return nil
2478 }
2479
2480 devBuild := isDevVersion(version)
2481 if devBuild {
2482 fmt.Fprintln(os.Stderr, "zut:", devVersionNotice)
2483 }
2484 term := tui.NewProcTerm()
2485
2486 var updateCh chan modes.UpdateInfo
2487 var changelogCh chan modes.ChangelogPayload
2488 if !devBuild {
2489 // Kick off the async update check so the banner can appear when the
2490 // http response eventually arrives (usually <1s on cached DNS). Map
2491 // agent.UpdateInfo -> modes.UpdateInfo here to avoid a cyclic import.
2492 updateCh = make(chan modes.UpdateInfo, 1)
2493 go func() {
2494 defer close(updateCh)
2495 src := <-CheckForUpdateAsync(ZutHome(), version)
2496 updateCh <- modes.UpdateInfo{
2497 Current: src.Current,
2498 Latest: src.Latest,
2499 Available: src.Available,
2500 URL: src.URL,
2501 }
2502 }()
2503
2504 // Changelog: when the running version differs from the last
2505 // version whose release notes the user dismissed, fetch the
2506 // release body from GitHub and have the TUI show it once. On
2507 // first-ever launch (no prior LastChangelogShown), seed the
2508 // stored version silently — don't dump release notes at someone
2509 // who just installed.
2510 changelogCh = make(chan modes.ChangelogPayload, 1)
2511 go func() {
2512 defer close(changelogCh)
2513 cfg, _ := LoadConfig()
2514 if cfg.LastChangelogShown == "" {
2515 SeedChangelogVersion(version)
2516 return
2517 }
2518 if !ShouldShowChangelog(version, cfg) {
2519 return
2520 }
2521 info := <-FetchChangelogAsync(version)
2522 if info.Body == "" {
2523 return
2524 }
2525 changelogCh <- modes.ChangelogPayload{
2526 Version: info.Version,
2527 Body: info.Body,
2528 URL: info.URL,
2529 }
2530 }()
2531 }
2532
2533 fastMode := r.FastMode
2534 quickModelShortcuts := interactiveQuickModelShortcuts(initialCfg.QuickModelShortcuts)
2535 themeEnv := strings.ToLower(strings.TrimSpace(os.Getenv("ZUT_THEME")))
2536 if themeEnv != "" && themeEnv != "auto" && themeEnv != "dark" && themeEnv != "light" {
2537 fmt.Fprintf(os.Stderr, "theme override: unsupported ZUT_THEME=%q; ignoring it\n", themeEnv)
2538 themeEnv = ""
2539 }
2540 themePreference := tui.ResolveThemePreference(initialCfg.Theme, themeEnv)
2541 theme, _, themeErr := tui.DetectThemeWithCustom(ZutHome(), themePreference.Effective, 80*time.Millisecond)
2542 if themeErr != nil {
2543 fmt.Fprintln(os.Stderr, "theme load:", themeErr)
2544 if !themePreference.Forced {
2545 themePreference = tui.ResolveThemePreference("", themeEnv)
2546 if initialCfg.Theme != "" {
2547 initialCfg.Theme = ""
2548 if err := SaveConfig(initialCfg); err != nil {
2549 fmt.Fprintln(os.Stderr, "theme reset:", err)
2550 }
2551 }
2552 }
2553 }
2554
2555 // Scope the dashboard to the active host session. The runtime owns
2556 // shutdown separately and closes the resident runtime exactly once.
2557 if sess != nil {
2558 runtime.SetActiveSession(sess.ID)
2559 }
2560
2561 var startupSkills []*skills.Skill
2562 if r.SkillTool != nil {
2563 startupSkills = r.SkillTool.Skills()
2564 }
2565 homeDir, _ := os.UserHomeDir()
2566 discoveredSubagents, _ := subagents.Discover(r.CWD, homeDir)
2567 subagentsAddendum := subagents.SystemPromptAddendum(discoveredSubagents)
2568 autoSubagentsToolAllowedForSession := autoSubagentsToolAllowed(args)
2569 autoSubagentsStatusToolAllowedForSession := autoSubagentsStatusToolAllowed(args)
2570 autoSubagentsStopToolAllowedForSession := autoSubagentsStopToolAllowed(args)
2571 autoSubagentsResumeToolAllowedForSession := autoSubagentsResumeToolAllowed(args)
2572 webSearchToolAllowedForInvocation := webSearchToolAllowedForSession(args)
2573 webSearchInvocationOverride := webSearchExplicitlyEnabledForSession(args)
2574 setWebSearchAvailable := func(available bool) {
2575 webSearchGuard.setAvailable(available)
2576 policy := subagents.WebSearchDeny
2577 if available {
2578 policy = subagents.WebSearchAllow
2579 }
2580 runtime.SetWebSearchPolicy(policy)
2581 }
2582
2583 iv = modes.NewInteractive(modes.InteractiveConfig{
2584 Terminal: term,
2585 Theme: theme,
2586 InlineImagesEnabled: initialCfg.InlineImagesEnabled,
2587 TerminalAlertsEnabled: initialCfg.TerminalAlertsEnabled,
2588 TerminalTitleEnabled: initialCfg.TerminalTitleEnabled,
2589 AutoSubagentsEnabled: initialCfg.AutoSubagentsEnabled,
2590 PonytailEnabled: initialCfg.PonytailEnabled,
2591 WebSearchEnabled: initialCfg.WebSearchEnabled,
2592 WebSearchToolAllowed: &webSearchToolAllowedForInvocation,
2593 WebSearchInvocationOverride: webSearchInvocationOverride,
2594 AutoSubagentsToolAllowed: &autoSubagentsToolAllowedForSession,
2595 AutoSubagentsStatusToolAllowed: &autoSubagentsStatusToolAllowedForSession,
2596 AutoSubagentsStopToolAllowed: &autoSubagentsStopToolAllowedForSession,
2597 AutoSubagentsResumeToolAllowed: &autoSubagentsResumeToolAllowedForSession,
2598 FastMode: &fastMode,
2599 LSPEnabled: initialCfg.LSPEnabled,
2600 SubagentLSPEnabled: initialCfg.SubagentLSPEnabled,
2601 AutoCompactThreshold: initialCfg.AutoCompactThreshold,
2602 GoalMaxTokenBudget: initialCfg.Goals.MaxTokenBudget,
2603 JailByDefault: initialCfg.JailByDefault,
2604 QuickModelShortcuts: quickModelShortcuts,
2605 ActiveModelProfile: initialCfg.ActiveModelProfile,
2606 RecursiveFileSuggest: initialCfg.RecursiveFileSuggest,
2607 RespectGitignore: initialCfg.RespectGitignore,
2608 CompactMode: initialCfg.CompactMode,
2609 TUIInputStyle: initialCfg.TUIInputStyle,
2610 TUIStatusPosition: initialCfg.TUIStatusPosition,
2611 TUIWorkingPosition: initialCfg.TUIWorkingPosition,
2612 ThemeName: initialCfg.Theme,
2613 EffectiveThemeName: themePreference.Effective,
2614 ThemeForced: themePreference.Forced,
2615 TerminalProfile: theme.Terminal,
2616 FlatTools: initialCfg.FlatToolRender(),
2617 CompactUser: initialCfg.CompactUserInput(),
2618 ExtensionThemes: extMgr.ThemeOptions,
2619 AutoSubagentsSystemAddendum: ProactiveSubagentsSystemAddendumFor(
2620 autoSubagentsToolAllowedForSession,
2621 autoSubagentsStopToolAllowedForSession,
2622 autoSubagentsResumeToolAllowedForSession,
2623 ),
2624 OnDemandSubagentsSystemAddendum: OnDemandSubagentsSystemAddendum,
2625 SubagentsSystemAddendum: subagentsAddendum,
2626 SettingsStore: configSettingsStore{},
2627 Model: r.Model,
2628 Provider: r.Provider,
2629 AuthMethod: r.AuthMethod,
2630 BaseURL: r.BaseURL,
2631 Reasoning: r.Reasoning,
2632 OnReasoningChanged: runtime.SetReasoning,
2633 OnFastModeChanged: runtime.SetFastMode,
2634 SystemPrompt: r.SystemPrompt,
2635 WritingGuidance: WritingGuidance(),
2636 Tools: r.ToolRegistry,
2637 MaxSteps: r.MaxSteps,
2638 CWD: r.CWD,
2639 StartupAgentName: args.AgentName,
2640 StartupContextPaths: instructionContextPaths(r.ContextFiles),
2641 StartupExtensionNames: startupExtensionNames(extMgr.All()),
2642 StartupExtensionErrors: startupExtensionErrors,
2643 StartupSkillNames: startupSkillNames(startupSkills),
2644 ShowInstructionsAtStartup: initialCfg.ShowInstructionsAtStartup,
2645 ZutHome: ZutHome(),
2646 SessionsRoot: agentSessionsRoot(ZutHome(), args),
2647 SessionsDisabled: args.NoSess,
2648 Version: version,
2649 UpdateInfoChan: updateCh,
2650 Sandbox: sharedSandbox,
2651 Agent: ag,
2652 InitialCompactHandoff: currentCompactHandoff(),
2653 InitialSessionTitle: func() string {
2654 if sess == nil || sessionTitlePending {
2655 return ""
2656 }
2657 return sess.Title
2658 }(),
2659 InitialSessionTitlePending: sessionTitlePending,
2660 InitialInput: args.Prompt,
2661 StartupPre: args.StartupPre,
2662 OnStartupPreDone: func() {
2663 // entry.pre often installs skills/extensions; rediscover them
2664 // before the user starts a model turn.
2665 current := liveInteractiveAgent(iv, ag)
2666 if extMgr != nil {
2667 _ = extMgr.Reload(context.Background(), 2*time.Second)
2668 }
2669 if current != nil {
2670 if _, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistryWithScheduler, iv); err != nil {
2671 iv.ReportError(err)
2672 }
2673 }
2674 },
2675 RefreshTools: func() error {
2676 current := liveInteractiveAgent(iv, ag)
2677 webSearchPolicy, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistryWithScheduler, iv)
2678 if err != nil {
2679 if !errors.Is(err, errInteractiveAgentChanged) {
2680 setWebSearchAvailable(false)
2681 }
2682 return err
2683 }
2684 setWebSearchAvailable(webSearchPolicy == subagents.WebSearchAllow)
2685 return nil
2686 },
2687 SetWebSearchAvailable: setWebSearchAvailable,
2688 RefreshPrompt: func() error {
2689 current := liveInteractiveAgent(iv, ag)
2690 webSearchPolicy, err := refreshAgentToolsAndPrompt(args, sharedSandbox, extToolAdapter, current, prepareInteractiveRegistryWithScheduler, iv)
2691 if err != nil {
2692 return err
2693 }
2694 setWebSearchAvailable(webSearchPolicy == subagents.WebSearchAllow)
2695 return nil
2696 },
2697 AuthManager: mgr,
2698 LlamaCPPConfig: ResolveLlamaCPPConfig,
2699 RefreshLlamaCPPModels: RefreshLlamaCPPModels,
2700 BuildAgent: buildAgent,
2701 SetKimiCLIFallbackDisabled: SetKimiCLIFallbackDisabled,
2702 BuildAgentFor: buildAgentFor,
2703 BuildAgentForRescue: buildAgentForRescue,
2704 LoggedInProviders: func() []string {
2705 var out []string
2706 seen := map[string]bool{}
2707 for _, p := range knownProviders {
2708 if CredentialAvailable(p) && !seen[p] {
2709 out = append(out, p)
2710 seen[p] = true
2711 }
2712 }
2713 // Include custom providers that have credentials stored.
2714 for p := range provider.CustomProviders() {
2715 if CredentialAvailable(p) && !seen[p] {
2716 out = append(out, p)
2717 seen[p] = true
2718 }
2719 }
2720 // Ollama models are always available (no auth needed).
2721 if !seen["ollama"] {
2722 out = append(out, "ollama")
2723 }
2724 return out
2725 },
2726 LoadSession: loadSession,
2727 LoadSessionContext: loadSessionContext,
2728 ChangeCWD: changeCWD,
2729 PersistCompactHandoff: persistCompactHandoff,
2730 CurrentCompactHandoff: currentCompactHandoff,
2731 PersistGoal: persistGoal,
2732 PersistGoalRuntime: persistGoalRuntime,
2733 CurrentGoal: currentGoal,
2734 CurrentGoalHistory: currentGoalHistory,
2735 EnsureMission: ensureMission,
2736 CurrentSessionPath: func() string {
2737 persistMu.Lock()
2738 defer persistMu.Unlock()
2739 if sess == nil {
2740 return ""
2741 }
2742 return sess.Path
2743 },
2744 FlushSession: func() {
2745 sessionTransitionMu.RLock()
2746 defer sessionTransitionMu.RUnlock()
2747 // Append any not-yet-persisted agent messages to the
2748 // current session file, then advance the baseline so
2749 // the final WriteNewTranscript at exit doesn't write
2750 // duplicates. Per-message persistence keeps the on-
2751 // disk file current already, so this is mostly a
2752 // defensive flush — still needed for /session export
2753 // to guarantee the exported bytes include the very
2754 // last in-flight turn.
2755 currentAg := iv.Agent()
2756 if currentAg == nil {
2757 return
2758 }
2759 persistMu.Lock()
2760 defer persistMu.Unlock()
2761 if sess == nil {
2762 return
2763 }
2764 next, flushErr := writeNewTranscriptLocked(currentAg, sess, sessBaselineMsgs)
2765 sessBaselineMsgs = next
2766 if flushErr != nil {
2767 iv.ReportError(fmt.Errorf("flush session: %w", flushErr))
2768 return
2769 }
2770 },
2771 SessionTransition: newSessionTransition(&sessionTransitionMu),
2772 Extensions: extMgr,
2773 ResidentManager: runtime.ResidentManager(),
2774 SpawnResident: func(ctx context.Context, request tools.ResidentSpawnRequest) (string, error) {
2775 manager := runtime.ResidentManager()
2776 if manager == nil {
2777 return "", errors.New("resident runtime is unavailable")
2778 }
2779 catalogue := r.ToolRegistry
2780 if iv != nil && iv.Agent() != nil {
2781 catalogue = iv.Agent().ToolsSnapshot()
2782 }
2783 spec, err := runtime.buildResidentChildSpec(ctx, request, catalogue)
2784 if err != nil {
2785 return "", err
2786 }
2787 if _, err := manager.Spawn(ctx, spec, request.Task); err != nil {
2788 return "", err
2789 }
2790 return spec.ID, nil
2791 },
2792 BuildResidentSpec: func(ctx context.Context, request tools.ResidentSpawnRequest) (subagents.ResidentChildSpec, error) {
2793 catalogue := r.ToolRegistry
2794 if iv != nil && iv.Agent() != nil {
2795 catalogue = iv.Agent().ToolsSnapshot()
2796 }
2797 return runtime.buildResidentChildSpec(ctx, request, catalogue)
2798 },
2799 ResolveSubagent: resolveSubagent,
2800 ChangelogChan: changelogCh,
2801 OnChangelogDismiss: func() {
2802 // For development builds, store the actual release version
2803 // so the same changelog doesn't show again next launch.
2804 // For real builds, store the binary version.
2805 v := version
2806 if devBuild {
2807 if iv != nil && iv.ChangelogVersion() != "" {
2808 v = iv.ChangelogVersion()
2809 }
2810 }
2811 _ = MarkChangelogShown(v)
2812 },
2813 SkillSnapshot: func() []*skills.Skill {
2814 if args.NoSkill {
2815 // --no-skill: nothing for the picker to show.
2816 return nil
2817 }
2818 // Re-discover so the picker reflects edits made during
2819 // the session. Cheap; SKILL.md files are small. Filter
2820 // out built-in skills — they're hidden from user-facing
2821 // surfaces because they're implementation detail; the
2822 // model still sees them through the system-prompt
2823 // manifest and the skill tool.
2824 userHome, _ := os.UserHomeDir()
2825 list, _ := skills.Discover(ZutHome(), r.CWD, userHome, args.WithSkills)
2826 list = mergeExtensionSkills(skills.NewTool(list), extMgr.Skills())
2827 return skills.VisibleSkills(list)
2828 },
2829 NoYolo: args.NoYolo,
2830 ConfirmGate: confirmGate,
2831 PersistModel: newPersistModelCallback(&persistMu, &sess, &activeProvider, &activeModel, func(message string) {
2832 if iv != nil {
2833 iv.Notify("session", "error", message)
2834 }
2835 }),
2836 CurrentSessionTitle: func() string {
2837 sessionTransitionMu.RLock()
2838 defer sessionTransitionMu.RUnlock()
2839 persistMu.Lock()
2840 defer persistMu.Unlock()
2841 if sess == nil || sessionTitlePending {
2842 return ""
2843 }
2844 return sess.Title
2845 },
2846 CurrentSessionTitlePending: func() bool {
2847 sessionTransitionMu.RLock()
2848 defer sessionTransitionMu.RUnlock()
2849 persistMu.Lock()
2850 defer persistMu.Unlock()
2851 return sessionTitlePending
2852 },
2853 PersistTitle: func(title string) error {
2854 persistMu.Lock()
2855 defer persistMu.Unlock()
2856 if sess == nil {
2857 return nil
2858 }
2859 if err := sess.UpdateTitle(title); err != nil {
2860 return err
2861 }
2862 sessionTitlePending = false
2863 return nil
2864 },
2865 OnSessionTitleChanged: func(title string) {
2866 sessionTransitionMu.RLock()
2867 defer sessionTransitionMu.RUnlock()
2868 persistMu.Lock()
2869 defer persistMu.Unlock()
2870 if sess != nil {
2871 sess.Title = title
2872 sessionTitlePending = false
2873 }
2874 },
2875 })
2876 extHooks.attachInteractive(iv)
2877 schedulerCtx, cancelScheduler := context.WithCancel(ctx)
2878 defer cancelScheduler()
2879 go func() {
2880 if err := scheduleEngine.Run(schedulerCtx, func(taskCtx context.Context, task scheduler.Task) error {
2881 unlockSession := lockScheduledSession(task.SessionID)
2882 defer unlockSession()
2883 // Keep a background session run mutually exclusive with /session
2884 // transitions. The active target uses Interactive's distinct-turn
2885 // ingress instead, so it never injects into an in-flight model loop.
2886 sessionTransitionMu.RLock()
2887 defer sessionTransitionMu.RUnlock()
2888 persistMu.Lock()
2889 activeTarget := sess != nil && sess.ID == task.SessionID
2890 persistMu.Unlock()
2891 if activeTarget {
2892 return iv.SubmitFollowUp(taskCtx, task.Message)
2893 }
2894 // A resumed background agent must schedule any follow-up work against
2895 // the transcript it resumed, not whichever session is visible in the
2896 // interactive TUI while it runs.
2897 backgroundRegistry := func(registry core.Registry) core.Registry {
2898 if schedulerAllowed {
2899 registry[tools.ScheduleToolName] = &tools.ScheduleTool{
2900 Engine: scheduleEngine,
2901 SessionID: func() string { return task.SessionID },
2902 Location: func() *time.Location { return time.Local },
2903 }
2904 }
2905 return registry
2906 }
2907 err := runScheduledSession(taskCtx, task, args, r, extMgr, backgroundRegistry)
2908 if err != nil {
2909 iv.Notify("scheduler", "error", fmt.Sprintf("scheduled task %s failed: %v", task.ID, err))
2910 } else {
2911 iv.Notify("scheduler", "success", fmt.Sprintf("scheduled task %s completed in session %s", task.ID, task.SessionID))
2912 }
2913 return err
2914 }); err != nil && schedulerCtx.Err() == nil {
2915 iv.ReportError(fmt.Errorf("scheduler stopped: %w", err))
2916 }
2917 }()
2918 go func() {
2919 <-reloadDone
2920 for _, reloadErr := range reloadErrs {
2921 if reloadErr != nil {
2922 iv.ReportError(fmt.Errorf("reload subagents: %w", reloadErr))
2923 }
2924 }
2925 }()
2926
2927 // Bind the interactive TUI as the Confirmer. We deferred this
2928 // until now because the gate is constructed before the TUI
2929 // (the BeforeToolExecute closure captures it). SetConfirmer
2930 // is mutex-guarded on the gate so this is safe.
2931 if confirmGate != nil {
2932 confirmGate.SetConfirmer(&confirmationEventConfirmer{
2933 inner: iv,
2934 emit: extMgr.EmitEvent,
2935 })
2936 }
2937
2938 // Signal-driven flush: a SIGTERM / SIGHUP to the zut process
2939 // (closed terminal window, system shutdown, kill) used to lose
2940 // the entire in-memory transcript because the deferred post-Run
2941 // flush below never ran. Per-message persistence above covers
2942 // most of it; this handler writes any in-flight remainder and
2943 // then exits the process so we don't double-paint over a
2944 // broken terminal that the TUI's restore deferreds can no
2945 // longer fix from a signal context.
2946 //
2947 // SIGINT is intentionally NOT handled here — the TUI consumes
2948 // Ctrl+C as a regular key event for cancel/clear semantics, and
2949 // installing a SIGINT notifier here would swallow it.
2950 sigCh := make(chan os.Signal, 1)
2951 signal.Notify(sigCh, syscall.SIGTERM, syscall.SIGHUP)
2952 defer signal.Stop(sigCh)
2953 go func() {
2954 _, ok := <-sigCh
2955 if !ok {
2956 return
2957 }
2958 finalAg := iv.Agent()
2959 if finalAg != nil {
2960 persistMu.Lock()
2961 if sess != nil {
2962 next, flushErr := writeNewTranscriptLocked(finalAg, sess, sessBaselineMsgs)
2963 sessBaselineMsgs = next
2964 if flushErr != nil {
2965 fmt.Fprintf(os.Stderr, "flush session: %v\n", flushErr)
2966 }
2967 if closeErr := sess.Close(); closeErr != nil {
2968 fmt.Fprintf(os.Stderr, "close session: %v\n", closeErr)
2969 }
2970 sess = nil
2971 }
2972 persistMu.Unlock()
2973 }
2974 closeAgentLSP(finalAg)
2975 closeResolvedLSP(r)
2976 // Stop supervised workers before exiting. os.Exit skips deferred
2977 // cleanup, so wait for reload and close the shared runtime explicitly.
2978 <-reloadDone
2979 _ = closeSubagentRuntimeFresh(runtime)
2980 // Exit cleanly. Re-raising the signal would skip os.Exit's
2981 // at-exit hooks; explicit exit is fine because we've already
2982 // flushed the only at-risk state (the session file) and stopped
2983 // supervised workers.
2984 os.Exit(0)
2985 }()
2986
2987 runErr = iv.Run(ctx)
2988
2989 // Flush final transcript to session (only if we had / ended up with an agent).
2990 if finalAg := iv.Agent(); finalAg != nil {
2991 persistMu.Lock()
2992 if sess != nil {
2993 next, flushErr := writeNewTranscriptLocked(finalAg, sess, sessBaselineMsgs)
2994 sessBaselineMsgs = next
2995 if flushErr != nil {
2996 runErr = errors.Join(runErr, fmt.Errorf("flush session: %w", flushErr))
2997 }
2998 }
2999 persistMu.Unlock()
3000 }
3001 return runErr
3002}
3003
3004func resumableSessionID(root string, sess *core.Session, hasMessages bool) string {
3005 if !hasMessages || sess == nil || sess.ID == "" || sess.Path == "" {
3006 return ""
3007 }
3008 managedRoot, err := filepath.Abs(filepath.Join(root, "sessions"))
3009 if err != nil {
3010 return ""
3011 }
3012 path, err := filepath.Abs(sess.Path)
3013 if err != nil {
3014 return ""
3015 }
3016 rel, err := filepath.Rel(managedRoot, path)
3017 if err != nil || rel == "." || rel == ".." || strings.HasPrefix(rel, ".."+string(filepath.Separator)) {
3018 return ""
3019 }
3020 if _, err := os.Stat(path); err != nil {
3021 return ""
3022 }
3023 return sess.ID
3024}
3025
3026func resumeSessionHint(id string) string {
3027 return fmt.Sprintf("Session ID: %s\nResume with: zut --resume %s\n\n", id, id)
3028}
3029
3030func agentSessionsRoot(root string, args Args) string {
3031 if args.AgentName == "" {
3032 return root
3033 }
3034 return filepath.Join(root, "sessions", "agents", safeAgentName(args.AgentName))
3035}
3036
3037// openOrCreateSession returns a session for the run. sess may be nil
3038// with a nil error if session persistence is disabled.
3039func openOrCreateSession(ctx context.Context, args Args, r Resolved, ag *core.Agent, version string) (*core.Session, error) {
3040 if args.NoSess {
3041 // Allocate the one logical identity for this non-persisted run during
3042 // runtime assembly instead of allowing a provider adapter to invent it.
3043 ag.SessionID()
3044 return nil, nil
3045 }
3046 // Sweep meta-only files left over from older zut versions (and from
3047 // any session that crashed before its first AppendMessage) for the
3048 // cwd-scoped picker paths. Explicit UUID lookup identifies candidates
3049 // from their headers so unrelated transcript corruption does not block
3050 // a valid resume.
3051 sessionsRoot := agentSessionsRoot(ZutHome(), args)
3052 if args.ResumeSessionID == "" {
3053 core.PruneEmptySessions(sessionsRoot, args.CWD)
3054 }
3055 var (
3056 s *core.Session
3057 msgs []provider.Message
3058 err error
3059 )
3060 switch {
3061 case args.Session != "":
3062 s, msgs, err = core.OpenSession(args.Session)
3063 // An explicit session path may be created on first use; session pickers
3064 // and resume paths still select existing files only.
3065 if err != nil && errors.Is(err, os.ErrNotExist) {
3066 s, err = core.NewSessionAtPath(args.Session, args.CWD, r.Provider, r.Model, version)
3067 msgs = nil
3068 }
3069 case args.Continue:
3070 latest := core.LatestSession(sessionsRoot, args.CWD)
3071 if latest != "" {
3072 s, msgs, err = core.OpenSession(latest)
3073 }
3074 case args.Resume:
3075 if args.ResumeSessionID != "" {
3076 picked, lookupErr := core.FindManagedSessionByID(ctx, ZutHome(), args.ResumeSessionID)
3077 if lookupErr != nil {
3078 return nil, lookupErr
3079 }
3080 if picked == "" {
3081 return nil, fmt.Errorf("session %q not found", args.ResumeSessionID)
3082 }
3083 s, msgs, err = core.OpenSession(picked)
3084 if err == nil && s.ID != args.ResumeSessionID {
3085 closeErr := s.Close()
3086 return nil, errors.Join(
3087 fmt.Errorf("session %q changed during resume", args.ResumeSessionID),
3088 closeErr,
3089 )
3090 }
3091 break
3092 }
3093 picked, perr := pickSession(sessionsRoot, args.CWD)
3094 if perr != nil {
3095 return nil, perr
3096 }
3097 if picked != "" {
3098 s, msgs, err = core.OpenSession(picked)
3099 }
3100 }
3101 if err != nil {
3102 return nil, err
3103 }
3104 if s != nil {
3105 if err := ag.BindSessionID(s.Meta.ID); err != nil {
3106 return nil, err
3107 }
3108 ag.SetSessionTimeContext(s.Meta.Started, s.Meta.Timezone, s.Meta.TimezoneOffset)
3109 ag.SetMessages(msgs)
3110 if cum, last, uerr := core.SessionUsageDetail(s.Path); uerr == nil {
3111 ag.SeedCost(cum)
3112 ag.SeedLastTurnUsage(last)
3113 }
3114 return s, nil
3115 }
3116 s, err = core.NewSession(sessionsRoot, args.CWD, r.Provider, r.Model, version)
3117 if err == nil {
3118 if bindErr := ag.BindSessionID(s.Meta.ID); bindErr != nil {
3119 return nil, bindErr
3120 }
3121 ag.SetSessionTimeContext(s.Meta.Started, s.Meta.Timezone, s.Meta.TimezoneOffset)
3122 }
3123 return s, err
3124}
3125
3126func pickSession(root, cwd string) (string, error) {
3127 files := core.ListSessions(root, cwd)
3128 if len(files) == 0 {
3129 fmt.Fprintln(os.Stderr, "no sessions for", cwd)
3130 return "", nil
3131 }
3132 for i, f := range files {
3133 fmt.Fprintf(os.Stderr, " %2d) %s\n", i+1, f)
3134 }
3135 fmt.Fprint(os.Stderr, "pick #: ")
3136 rd := bufio.NewReader(os.Stdin)
3137 line, _ := rd.ReadString('\n')
3138 line = strings.TrimSpace(line)
3139 var n int
3140 if _, err := fmt.Sscanf(line, "%d", &n); err != nil || n < 1 || n > len(files) {
3141 return "", fmt.Errorf("invalid selection")
3142 }
3143 return files[n-1], nil
3144}
3145
3146// WriteNewTranscript appends only messages after index `from` from the
3147// agent's transcript to the session. Used by callers that don't hold
3148// the persistMu (non-interactive print/json modes which run a single
3149// turn under their own goroutine).
3150func WriteNewTranscript(ag *core.Agent, sess *core.Session, from int) error {
3151 _, err := writeNewTranscriptLocked(ag, sess, from)
3152 return err
3153}
3154
3155func wireRetryLifecyclePersistence(ag *core.Agent, sess *core.Session) {
3156 if ag == nil {
3157 return
3158 }
3159 if sess == nil {
3160 ag.OnRetryLifecycle = nil
3161 return
3162 }
3163 ag.OnRetryLifecycle = sess.RecordRetryLifecycle
3164}
3165
3166// writeNewTranscriptLocked is the same as WriteNewTranscript. The
3167// suffix marks that interactive callers must hold persistMu when
3168// invoking it so concurrent appends from the agent loop don't race
3169// with this catch-up flush.
3170func writeNewTranscriptLocked(ag *core.Agent, sess *core.Session, from int) (next int, err error) {
3171 next = from
3172 if sess == nil || ag == nil {
3173 return next, nil
3174 }
3175 msgs, total := ag.MessagesFrom(from)
3176 for offset, msg := range msgs {
3177 index := from + offset
3178 if err := sess.AppendMessage(msg); err != nil {
3179 return next, fmt.Errorf("append transcript message %d: %w", index, err)
3180 }
3181 next = index + 1
3182 }
3183 if len(msgs) == 0 {
3184 next = total
3185 }
3186 cum := ag.Cost()
3187 if err := sess.AppendUsage(cum, cum); err != nil {
3188 return next, fmt.Errorf("append transcript usage: %w", err)
3189 }
3190 if err := sess.Flush(); err != nil {
3191 return next, fmt.Errorf("flush transcript: %w", err)
3192 }
3193 return next, nil
3194}
3195
3196func argsForStdin(rawArgs []string, mode os.FileMode) []string {
3197 if mode&os.ModeCharDevice != 0 {
3198 return rawArgs
3199 }
3200 return append([]string{"--print"}, rawArgs...)
3201}
3202
3203func combinePromptInput(stdin, positional string) string {
3204 parts := make([]string, 0, 2)
3205 if stdin = strings.TrimSpace(stdin); stdin != "" {
3206 parts = append(parts, stdin)
3207 }
3208 if positional = strings.TrimSpace(positional); positional != "" {
3209 parts = append(parts, positional)
3210 }
3211 return strings.Join(parts, "\n")
3212}
3213
3214func readAllStdin() (string, error) {
3215 fi, err := os.Stdin.Stat()
3216 if err != nil {
3217 return "", err
3218 }
3219 if (fi.Mode() & os.ModeCharDevice) != 0 {
3220 return "", nil
3221 }
3222 return readAllStdinFrom(os.Stdin)
3223}
3224
3225func readAllStdinFrom(r io.Reader) (string, error) {
3226 b, err := io.ReadAll(r)
3227 return string(b), err
3228}
3229
3230func printModels() {
3231 models := provider.Active()
3232
3233 // Compute column widths from actual data so wide providers (e.g.
3234 // xiaomi-token-plan-sgp) and long bedrock model ids don't force the
3235 // `name` column off-screen. Floors mirror the historical layout so
3236 // short catalogs look the same as before.
3237 provW, idW, srcW := len("provider"), len("model id"), len("source")
3238 for _, m := range models {
3239 if w := len(m.Provider); w > provW {
3240 provW = w
3241 }
3242 if w := len(m.ID); w > idW {
3243 idW = w
3244 }
3245 source := m.Source
3246 if source == "" {
3247 source = "catalog"
3248 }
3249 if m.Speculative {
3250 source = "speculative"
3251 }
3252 if w := len(source); w > srcW {
3253 srcW = w
3254 }
3255 }
3256
3257 header := fmt.Sprintf("%-*s %-*s %8s %8s %s %-*s %s",
3258 provW, "provider",
3259 idW, "model id",
3260 "context", "max-out", "reasoning",
3261 srcW, "source",
3262 "name")
3263 fmt.Println(header)
3264
3265 for _, m := range models {
3266 reason := " "
3267 if m.Reasoning {
3268 reason = "✓"
3269 }
3270 source := m.Source
3271 if source == "" {
3272 source = "catalog"
3273 }
3274 if m.Speculative {
3275 source = "speculative"
3276 }
3277 fmt.Printf("%-*s %-*s %8d %8d %s %-*s %s\n",
3278 provW, m.Provider,
3279 idW, m.ID,
3280 m.ContextWindow, m.MaxOutput,
3281 reason,
3282 srcW, source,
3283 m.DisplayName)
3284 }
3285}