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