1package agent
2
3import (
4 "context"
5 _ "embed"
6 "errors"
7 "fmt"
8 "log/slog"
9 "os"
10 "strconv"
11 "strings"
12 "sync"
13 "time"
14
15 "charm.land/fantasy"
16 "charm.land/fantasy/providers/anthropic"
17 "charm.land/fantasy/providers/bedrock"
18 "charm.land/fantasy/providers/google"
19 "charm.land/fantasy/providers/openai"
20 "charm.land/fantasy/providers/openrouter"
21 "github.com/charmbracelet/catwalk/pkg/catwalk"
22 "github.com/charmbracelet/crush/internal/agent/tools"
23 "github.com/charmbracelet/crush/internal/config"
24 "github.com/charmbracelet/crush/internal/csync"
25 "github.com/charmbracelet/crush/internal/message"
26 "github.com/charmbracelet/crush/internal/permission"
27 "github.com/charmbracelet/crush/internal/session"
28)
29
30//go:embed templates/title.md
31var titlePrompt []byte
32
33//go:embed templates/summary.md
34var summaryPrompt []byte
35
36type SessionAgentCall struct {
37 SessionID string
38 Prompt string
39 ProviderOptions fantasy.ProviderOptions
40 Attachments []message.Attachment
41 MaxOutputTokens int64
42 Temperature *float64
43 TopP *float64
44 TopK *int64
45 FrequencyPenalty *float64
46 PresencePenalty *float64
47}
48
49type SessionAgent interface {
50 Run(context.Context, SessionAgentCall) (*fantasy.AgentResult, error)
51 SetModels(large Model, small Model)
52 SetTools(tools []fantasy.AgentTool)
53 Cancel(sessionID string)
54 CancelAll()
55 IsSessionBusy(sessionID string) bool
56 IsBusy() bool
57 QueuedPrompts(sessionID string) int
58 ClearQueue(sessionID string)
59 Summarize(context.Context, string, fantasy.ProviderOptions) error
60 Model() Model
61}
62
63type Model struct {
64 Model fantasy.LanguageModel
65 CatwalkCfg catwalk.Model
66 ModelCfg config.SelectedModel
67}
68
69type sessionAgent struct {
70 largeModel Model
71 smallModel Model
72 systemPromptPrefix string
73 systemPrompt string
74 tools []fantasy.AgentTool
75 sessions session.Service
76 messages message.Service
77 disableAutoSummarize bool
78 isYolo bool
79
80 messageQueue *csync.Map[string, []SessionAgentCall]
81 activeRequests *csync.Map[string, context.CancelFunc]
82}
83
84type SessionAgentOptions struct {
85 LargeModel Model
86 SmallModel Model
87 SystemPromptPrefix string
88 SystemPrompt string
89 DisableAutoSummarize bool
90 IsYolo bool
91 Sessions session.Service
92 Messages message.Service
93 Tools []fantasy.AgentTool
94}
95
96func NewSessionAgent(
97 opts SessionAgentOptions,
98) SessionAgent {
99 return &sessionAgent{
100 largeModel: opts.LargeModel,
101 smallModel: opts.SmallModel,
102 systemPromptPrefix: opts.SystemPromptPrefix,
103 systemPrompt: opts.SystemPrompt,
104 sessions: opts.Sessions,
105 messages: opts.Messages,
106 disableAutoSummarize: opts.DisableAutoSummarize,
107 tools: opts.Tools,
108 isYolo: opts.IsYolo,
109 messageQueue: csync.NewMap[string, []SessionAgentCall](),
110 activeRequests: csync.NewMap[string, context.CancelFunc](),
111 }
112}
113
114func (a *sessionAgent) Run(ctx context.Context, call SessionAgentCall) (*fantasy.AgentResult, error) {
115 if call.Prompt == "" {
116 return nil, ErrEmptyPrompt
117 }
118 if call.SessionID == "" {
119 return nil, ErrSessionMissing
120 }
121
122 // Queue the message if busy
123 if a.IsSessionBusy(call.SessionID) {
124 existing, ok := a.messageQueue.Get(call.SessionID)
125 if !ok {
126 existing = []SessionAgentCall{}
127 }
128 existing = append(existing, call)
129 a.messageQueue.Set(call.SessionID, existing)
130 return nil, nil
131 }
132
133 if len(a.tools) > 0 {
134 // add anthropic caching to the last tool
135 a.tools[len(a.tools)-1].SetProviderOptions(a.getCacheControlOptions())
136 }
137
138 agent := fantasy.NewAgent(
139 a.largeModel.Model,
140 fantasy.WithSystemPrompt(a.systemPrompt),
141 fantasy.WithTools(a.tools...),
142 )
143
144 sessionLock := sync.Mutex{}
145 currentSession, err := a.sessions.Get(ctx, call.SessionID)
146 if err != nil {
147 return nil, fmt.Errorf("failed to get session: %w", err)
148 }
149
150 msgs, err := a.getSessionMessages(ctx, currentSession)
151 if err != nil {
152 return nil, fmt.Errorf("failed to get session messages: %w", err)
153 }
154
155 var wg sync.WaitGroup
156 // Generate title if first message
157 if len(msgs) == 0 {
158 wg.Go(func() {
159 sessionLock.Lock()
160 a.generateTitle(ctx, ¤tSession, call.Prompt)
161 sessionLock.Unlock()
162 })
163 }
164
165 // Add the user message to the session
166 _, err = a.createUserMessage(ctx, call)
167 if err != nil {
168 return nil, err
169 }
170
171 // add the session to the context
172 ctx = context.WithValue(ctx, tools.SessionIDContextKey, call.SessionID)
173
174 genCtx, cancel := context.WithCancel(ctx)
175 a.activeRequests.Set(call.SessionID, cancel)
176
177 defer cancel()
178 defer a.activeRequests.Del(call.SessionID)
179
180 history, files := a.preparePrompt(msgs, call.Attachments...)
181
182 startTime := time.Now()
183 a.eventPromptSent(call.SessionID)
184
185 var currentAssistant *message.Message
186 var shouldSummarize bool
187 result, err := agent.Stream(genCtx, fantasy.AgentStreamCall{
188 Prompt: call.Prompt,
189 Files: files,
190 Messages: history,
191 ProviderOptions: call.ProviderOptions,
192 MaxOutputTokens: &call.MaxOutputTokens,
193 TopP: call.TopP,
194 Temperature: call.Temperature,
195 PresencePenalty: call.PresencePenalty,
196 TopK: call.TopK,
197 FrequencyPenalty: call.FrequencyPenalty,
198 // Before each step create the new assistant message
199 PrepareStep: func(callContext context.Context, options fantasy.PrepareStepFunctionOptions) (_ context.Context, prepared fantasy.PrepareStepResult, err error) {
200 prepared.Messages = options.Messages
201 // reset all cached items
202 for i := range prepared.Messages {
203 prepared.Messages[i].ProviderOptions = nil
204 }
205
206 queuedCalls, _ := a.messageQueue.Get(call.SessionID)
207 a.messageQueue.Del(call.SessionID)
208 for _, queued := range queuedCalls {
209 userMessage, createErr := a.createUserMessage(callContext, queued)
210 if createErr != nil {
211 return callContext, prepared, createErr
212 }
213 prepared.Messages = append(prepared.Messages, userMessage.ToAIMessage()...)
214 }
215
216 lastSystemRoleInx := 0
217 systemMessageUpdated := false
218 for i, msg := range prepared.Messages {
219 // only add cache control to the last message
220 if msg.Role == fantasy.MessageRoleSystem {
221 lastSystemRoleInx = i
222 } else if !systemMessageUpdated {
223 prepared.Messages[lastSystemRoleInx].ProviderOptions = a.getCacheControlOptions()
224 systemMessageUpdated = true
225 }
226 // than add cache control to the last 2 messages
227 if i > len(prepared.Messages)-3 {
228 prepared.Messages[i].ProviderOptions = a.getCacheControlOptions()
229 }
230 }
231
232 if a.systemPromptPrefix != "" {
233 prepared.Messages = append([]fantasy.Message{fantasy.NewSystemMessage(a.systemPromptPrefix)}, prepared.Messages...)
234 }
235
236 var assistantMsg message.Message
237 assistantMsg, err = a.messages.Create(callContext, call.SessionID, message.CreateMessageParams{
238 Role: message.Assistant,
239 Parts: []message.ContentPart{},
240 Model: a.largeModel.ModelCfg.Model,
241 Provider: a.largeModel.ModelCfg.Provider,
242 })
243 if err != nil {
244 return callContext, prepared, err
245 }
246 callContext = context.WithValue(callContext, tools.MessageIDContextKey, assistantMsg.ID)
247 currentAssistant = &assistantMsg
248 return callContext, prepared, err
249 },
250 OnReasoningStart: func(id string, reasoning fantasy.ReasoningContent) error {
251 currentAssistant.AppendReasoningContent(reasoning.Text)
252 return a.messages.Update(genCtx, *currentAssistant)
253 },
254 OnReasoningDelta: func(id string, text string) error {
255 currentAssistant.AppendReasoningContent(text)
256 return a.messages.Update(genCtx, *currentAssistant)
257 },
258 OnReasoningEnd: func(id string, reasoning fantasy.ReasoningContent) error {
259 // handle anthropic signature
260 if anthropicData, ok := reasoning.ProviderMetadata[anthropic.Name]; ok {
261 if reasoning, ok := anthropicData.(*anthropic.ReasoningOptionMetadata); ok {
262 currentAssistant.AppendReasoningSignature(reasoning.Signature)
263 }
264 }
265 if googleData, ok := reasoning.ProviderMetadata[google.Name]; ok {
266 if reasoning, ok := googleData.(*google.ReasoningMetadata); ok {
267 currentAssistant.AppendReasoningSignature(reasoning.Signature)
268 }
269 }
270 if openaiData, ok := reasoning.ProviderMetadata[openai.Name]; ok {
271 if reasoning, ok := openaiData.(*openai.ResponsesReasoningMetadata); ok {
272 currentAssistant.SetReasoningResponsesData(reasoning)
273 }
274 }
275 currentAssistant.FinishThinking()
276 return a.messages.Update(genCtx, *currentAssistant)
277 },
278 OnTextDelta: func(id string, text string) error {
279 currentAssistant.AppendContent(text)
280 return a.messages.Update(genCtx, *currentAssistant)
281 },
282 OnToolInputStart: func(id string, toolName string) error {
283 toolCall := message.ToolCall{
284 ID: id,
285 Name: toolName,
286 ProviderExecuted: false,
287 Finished: false,
288 }
289 currentAssistant.AddToolCall(toolCall)
290 return a.messages.Update(genCtx, *currentAssistant)
291 },
292 OnRetry: func(err *fantasy.APICallError, delay time.Duration) {
293 // TODO: implement
294 },
295 OnToolCall: func(tc fantasy.ToolCallContent) error {
296 toolCall := message.ToolCall{
297 ID: tc.ToolCallID,
298 Name: tc.ToolName,
299 Input: tc.Input,
300 ProviderExecuted: false,
301 Finished: true,
302 }
303 currentAssistant.AddToolCall(toolCall)
304 return a.messages.Update(genCtx, *currentAssistant)
305 },
306 OnToolResult: func(result fantasy.ToolResultContent) error {
307 var resultContent string
308 isError := false
309 switch result.Result.GetType() {
310 case fantasy.ToolResultContentTypeText:
311 r, ok := fantasy.AsToolResultOutputType[fantasy.ToolResultOutputContentText](result.Result)
312 if ok {
313 resultContent = r.Text
314 }
315 case fantasy.ToolResultContentTypeError:
316 r, ok := fantasy.AsToolResultOutputType[fantasy.ToolResultOutputContentError](result.Result)
317 if ok {
318 isError = true
319 resultContent = r.Error.Error()
320 }
321 case fantasy.ToolResultContentTypeMedia:
322 // TODO: handle this message type
323 }
324 toolResult := message.ToolResult{
325 ToolCallID: result.ToolCallID,
326 Name: result.ToolName,
327 Content: resultContent,
328 IsError: isError,
329 Metadata: result.ClientMetadata,
330 }
331 _, createMsgErr := a.messages.Create(genCtx, currentAssistant.SessionID, message.CreateMessageParams{
332 Role: message.Tool,
333 Parts: []message.ContentPart{
334 toolResult,
335 },
336 })
337 if createMsgErr != nil {
338 return createMsgErr
339 }
340 return nil
341 },
342 OnStepFinish: func(stepResult fantasy.StepResult) error {
343 finishReason := message.FinishReasonUnknown
344 switch stepResult.FinishReason {
345 case fantasy.FinishReasonLength:
346 finishReason = message.FinishReasonMaxTokens
347 case fantasy.FinishReasonStop:
348 finishReason = message.FinishReasonEndTurn
349 case fantasy.FinishReasonToolCalls:
350 finishReason = message.FinishReasonToolUse
351 }
352 currentAssistant.AddFinish(finishReason, "", "")
353 a.updateSessionUsage(a.largeModel, ¤tSession, stepResult.Usage, a.openrouterCost(stepResult.ProviderMetadata))
354 sessionLock.Lock()
355 _, sessionErr := a.sessions.Save(genCtx, currentSession)
356 sessionLock.Unlock()
357 if sessionErr != nil {
358 return sessionErr
359 }
360 return a.messages.Update(genCtx, *currentAssistant)
361 },
362 StopWhen: []fantasy.StopCondition{
363 func(_ []fantasy.StepResult) bool {
364 contextWindow := a.largeModel.CatwalkCfg.ContextWindow
365 tokens := currentSession.CompletionTokens + currentSession.PromptTokens
366 percentage := (float64(tokens) / float64(contextWindow)) * 100
367 if (percentage > 80) && !a.disableAutoSummarize {
368 shouldSummarize = true
369 return true
370 }
371 return false
372 },
373 },
374 })
375
376 a.eventPromptResponded(call.SessionID, time.Since(startTime).Truncate(time.Second))
377
378 if err != nil {
379 isCancelErr := errors.Is(err, context.Canceled)
380 isPermissionErr := errors.Is(err, permission.ErrorPermissionDenied)
381 if currentAssistant == nil {
382 return result, err
383 }
384 // Ensure we finish thinking on error to close the reasoning state
385 currentAssistant.FinishThinking()
386 toolCalls := currentAssistant.ToolCalls()
387 // INFO: we use the parent context here because the genCtx has been cancelled
388 msgs, createErr := a.messages.List(ctx, currentAssistant.SessionID)
389 if createErr != nil {
390 return nil, createErr
391 }
392 for _, tc := range toolCalls {
393 if !tc.Finished {
394 tc.Finished = true
395 tc.Input = "{}"
396 currentAssistant.AddToolCall(tc)
397 updateErr := a.messages.Update(ctx, *currentAssistant)
398 if updateErr != nil {
399 return nil, updateErr
400 }
401 }
402
403 found := false
404 for _, msg := range msgs {
405 if msg.Role == message.Tool {
406 for _, tr := range msg.ToolResults() {
407 if tr.ToolCallID == tc.ID {
408 found = true
409 break
410 }
411 }
412 }
413 if found {
414 break
415 }
416 }
417 if found {
418 continue
419 }
420 content := "There was an error while executing the tool"
421 if isCancelErr {
422 content = "Tool execution canceled by user"
423 } else if isPermissionErr {
424 content = "Permission denied"
425 }
426 toolResult := message.ToolResult{
427 ToolCallID: tc.ID,
428 Name: tc.Name,
429 Content: content,
430 IsError: true,
431 }
432 _, createErr = a.messages.Create(context.Background(), currentAssistant.SessionID, message.CreateMessageParams{
433 Role: message.Tool,
434 Parts: []message.ContentPart{
435 toolResult,
436 },
437 })
438 if createErr != nil {
439 return nil, createErr
440 }
441 }
442 if isCancelErr {
443 currentAssistant.AddFinish(message.FinishReasonCanceled, "Request cancelled", "")
444 } else if isPermissionErr {
445 currentAssistant.AddFinish(message.FinishReasonPermissionDenied, "Permission denied", "")
446 } else {
447 currentAssistant.AddFinish(message.FinishReasonError, "API Error", err.Error())
448 }
449 // INFO: we use the parent context here because the genCtx has been cancelled
450 updateErr := a.messages.Update(ctx, *currentAssistant)
451 if updateErr != nil {
452 return nil, updateErr
453 }
454 return nil, err
455 }
456 wg.Wait()
457
458 if shouldSummarize {
459 a.activeRequests.Del(call.SessionID)
460 if summarizeErr := a.Summarize(genCtx, call.SessionID, call.ProviderOptions); summarizeErr != nil {
461 return nil, summarizeErr
462 }
463 // if the agent was not done...
464 if len(currentAssistant.ToolCalls()) > 0 {
465 existing, ok := a.messageQueue.Get(call.SessionID)
466 if !ok {
467 existing = []SessionAgentCall{}
468 }
469 call.Prompt = fmt.Sprintf("The previous session was interrupted because it got too long, the initial user request was: `%s`", call.Prompt)
470 existing = append(existing, call)
471 a.messageQueue.Set(call.SessionID, existing)
472 }
473 }
474
475 // release active request before processing queued messages
476 a.activeRequests.Del(call.SessionID)
477 cancel()
478
479 queuedMessages, ok := a.messageQueue.Get(call.SessionID)
480 if !ok || len(queuedMessages) == 0 {
481 return result, err
482 }
483 // there are queued messages restart the loop
484 firstQueuedMessage := queuedMessages[0]
485 a.messageQueue.Set(call.SessionID, queuedMessages[1:])
486 return a.Run(ctx, firstQueuedMessage)
487}
488
489func (a *sessionAgent) Summarize(ctx context.Context, sessionID string, opts fantasy.ProviderOptions) error {
490 if a.IsSessionBusy(sessionID) {
491 return ErrSessionBusy
492 }
493
494 currentSession, err := a.sessions.Get(ctx, sessionID)
495 if err != nil {
496 return fmt.Errorf("failed to get session: %w", err)
497 }
498 msgs, err := a.getSessionMessages(ctx, currentSession)
499 if err != nil {
500 return err
501 }
502 if len(msgs) == 0 {
503 // nothing to summarize
504 return nil
505 }
506
507 aiMsgs, _ := a.preparePrompt(msgs)
508
509 genCtx, cancel := context.WithCancel(ctx)
510 a.activeRequests.Set(sessionID, cancel)
511 defer a.activeRequests.Del(sessionID)
512 defer cancel()
513
514 agent := fantasy.NewAgent(a.largeModel.Model,
515 fantasy.WithSystemPrompt(string(summaryPrompt)),
516 )
517 summaryMessage, err := a.messages.Create(ctx, sessionID, message.CreateMessageParams{
518 Role: message.Assistant,
519 Model: a.largeModel.Model.Model(),
520 Provider: a.largeModel.Model.Provider(),
521 IsSummaryMessage: true,
522 })
523 if err != nil {
524 return err
525 }
526
527 resp, err := agent.Stream(genCtx, fantasy.AgentStreamCall{
528 Prompt: "Provide a detailed summary of our conversation above.",
529 Messages: aiMsgs,
530 ProviderOptions: opts,
531 OnReasoningDelta: func(id string, text string) error {
532 summaryMessage.AppendReasoningContent(text)
533 return a.messages.Update(genCtx, summaryMessage)
534 },
535 OnReasoningEnd: func(id string, reasoning fantasy.ReasoningContent) error {
536 // handle anthropic signature
537 if anthropicData, ok := reasoning.ProviderMetadata["anthropic"]; ok {
538 if signature, ok := anthropicData.(*anthropic.ReasoningOptionMetadata); ok && signature.Signature != "" {
539 summaryMessage.AppendReasoningSignature(signature.Signature)
540 }
541 }
542 summaryMessage.FinishThinking()
543 return a.messages.Update(genCtx, summaryMessage)
544 },
545 OnTextDelta: func(id, text string) error {
546 summaryMessage.AppendContent(text)
547 return a.messages.Update(genCtx, summaryMessage)
548 },
549 })
550 if err != nil {
551 isCancelErr := errors.Is(err, context.Canceled)
552 if isCancelErr {
553 // User cancelled summarize we need to remove the summary message
554 deleteErr := a.messages.Delete(ctx, summaryMessage.ID)
555 return deleteErr
556 }
557 return err
558 }
559
560 summaryMessage.AddFinish(message.FinishReasonEndTurn, "", "")
561 err = a.messages.Update(genCtx, summaryMessage)
562 if err != nil {
563 return err
564 }
565
566 var openrouterCost *float64
567 for _, step := range resp.Steps {
568 stepCost := a.openrouterCost(step.ProviderMetadata)
569 if stepCost != nil {
570 newCost := *stepCost
571 if openrouterCost != nil {
572 newCost += *openrouterCost
573 }
574 openrouterCost = &newCost
575 }
576 }
577
578 a.updateSessionUsage(a.largeModel, ¤tSession, resp.TotalUsage, openrouterCost)
579
580 // just in case get just the last usage
581 usage := resp.Response.Usage
582 currentSession.SummaryMessageID = summaryMessage.ID
583 currentSession.CompletionTokens = usage.OutputTokens
584 currentSession.PromptTokens = 0
585 _, err = a.sessions.Save(genCtx, currentSession)
586 return err
587}
588
589func (a *sessionAgent) getCacheControlOptions() fantasy.ProviderOptions {
590 if t, _ := strconv.ParseBool(os.Getenv("CRUSH_DISABLE_ANTHROPIC_CACHE")); t {
591 return fantasy.ProviderOptions{}
592 }
593 return fantasy.ProviderOptions{
594 anthropic.Name: &anthropic.ProviderCacheControlOptions{
595 CacheControl: anthropic.CacheControl{Type: "ephemeral"},
596 },
597 bedrock.Name: &anthropic.ProviderCacheControlOptions{
598 CacheControl: anthropic.CacheControl{Type: "ephemeral"},
599 },
600 }
601}
602
603func (a *sessionAgent) createUserMessage(ctx context.Context, call SessionAgentCall) (message.Message, error) {
604 var attachmentParts []message.ContentPart
605 for _, attachment := range call.Attachments {
606 attachmentParts = append(attachmentParts, message.BinaryContent{Path: attachment.FilePath, MIMEType: attachment.MimeType, Data: attachment.Content})
607 }
608 parts := []message.ContentPart{message.TextContent{Text: call.Prompt}}
609 parts = append(parts, attachmentParts...)
610 msg, err := a.messages.Create(ctx, call.SessionID, message.CreateMessageParams{
611 Role: message.User,
612 Parts: parts,
613 })
614 if err != nil {
615 return message.Message{}, fmt.Errorf("failed to create user message: %w", err)
616 }
617 return msg, nil
618}
619
620func (a *sessionAgent) preparePrompt(msgs []message.Message, attachments ...message.Attachment) ([]fantasy.Message, []fantasy.FilePart) {
621 var history []fantasy.Message
622 for _, m := range msgs {
623 if len(m.Parts) == 0 {
624 continue
625 }
626 // Assistant message without content or tool calls (cancelled before it returned anything)
627 if m.Role == message.Assistant && len(m.ToolCalls()) == 0 && m.Content().Text == "" && m.ReasoningContent().String() == "" {
628 continue
629 }
630 history = append(history, m.ToAIMessage()...)
631 }
632
633 var files []fantasy.FilePart
634 for _, attachment := range attachments {
635 files = append(files, fantasy.FilePart{
636 Filename: attachment.FileName,
637 Data: attachment.Content,
638 MediaType: attachment.MimeType,
639 })
640 }
641
642 return history, files
643}
644
645func (a *sessionAgent) getSessionMessages(ctx context.Context, session session.Session) ([]message.Message, error) {
646 msgs, err := a.messages.List(ctx, session.ID)
647 if err != nil {
648 return nil, fmt.Errorf("failed to list messages: %w", err)
649 }
650
651 if session.SummaryMessageID != "" {
652 summaryMsgInex := -1
653 for i, msg := range msgs {
654 if msg.ID == session.SummaryMessageID {
655 summaryMsgInex = i
656 break
657 }
658 }
659 if summaryMsgInex != -1 {
660 msgs = msgs[summaryMsgInex:]
661 msgs[0].Role = message.User
662 }
663 }
664 return msgs, nil
665}
666
667func (a *sessionAgent) generateTitle(ctx context.Context, session *session.Session, prompt string) {
668 if prompt == "" {
669 return
670 }
671
672 var maxOutput int64 = 40
673 if a.smallModel.CatwalkCfg.CanReason {
674 maxOutput = a.smallModel.CatwalkCfg.DefaultMaxTokens
675 }
676
677 agent := fantasy.NewAgent(a.smallModel.Model,
678 fantasy.WithSystemPrompt(string(titlePrompt)+"\n /no_think"),
679 fantasy.WithMaxOutputTokens(maxOutput),
680 )
681
682 resp, err := agent.Stream(ctx, fantasy.AgentStreamCall{
683 Prompt: fmt.Sprintf("Generate a concise title for the following content:\n\n%s\n <think>\n\n</think>", prompt),
684 })
685 if err != nil {
686 slog.Error("error generating title", "err", err)
687 return
688 }
689
690 title := resp.Response.Content.Text()
691
692 title = strings.ReplaceAll(title, "\n", " ")
693
694 // remove thinking tags if present
695 if idx := strings.Index(title, "</think>"); idx > 0 {
696 title = title[idx+len("</think>"):]
697 }
698
699 title = strings.TrimSpace(title)
700 if title == "" {
701 slog.Warn("failed to generate title", "warn", "empty title")
702 return
703 }
704
705 session.Title = title
706
707 var openrouterCost *float64
708 for _, step := range resp.Steps {
709 stepCost := a.openrouterCost(step.ProviderMetadata)
710 if stepCost != nil {
711 newCost := *stepCost
712 if openrouterCost != nil {
713 newCost += *openrouterCost
714 }
715 openrouterCost = &newCost
716 }
717 }
718
719 a.updateSessionUsage(a.smallModel, session, resp.TotalUsage, openrouterCost)
720 _, saveErr := a.sessions.Save(ctx, *session)
721 if saveErr != nil {
722 slog.Error("failed to save session title & usage", "error", saveErr)
723 return
724 }
725}
726
727func (a *sessionAgent) openrouterCost(metadata fantasy.ProviderMetadata) *float64 {
728 openrouterMetadata, ok := metadata[openrouter.Name]
729 if !ok {
730 return nil
731 }
732
733 opts, ok := openrouterMetadata.(*openrouter.ProviderMetadata)
734 if !ok {
735 return nil
736 }
737 return &opts.Usage.Cost
738}
739
740func (a *sessionAgent) updateSessionUsage(model Model, session *session.Session, usage fantasy.Usage, overrideCost *float64) {
741 modelConfig := model.CatwalkCfg
742 cost := modelConfig.CostPer1MInCached/1e6*float64(usage.CacheCreationTokens) +
743 modelConfig.CostPer1MOutCached/1e6*float64(usage.CacheReadTokens) +
744 modelConfig.CostPer1MIn/1e6*float64(usage.InputTokens) +
745 modelConfig.CostPer1MOut/1e6*float64(usage.OutputTokens)
746
747 a.eventTokensUsed(session.ID, model, usage, cost)
748
749 if overrideCost != nil {
750 session.Cost += *overrideCost
751 } else {
752 session.Cost += cost
753 }
754
755 session.CompletionTokens = usage.OutputTokens + usage.CacheReadTokens
756 session.PromptTokens = usage.InputTokens + usage.CacheCreationTokens
757}
758
759func (a *sessionAgent) Cancel(sessionID string) {
760 // Cancel regular requests
761 if cancel, ok := a.activeRequests.Take(sessionID); ok && cancel != nil {
762 slog.Info("Request cancellation initiated", "session_id", sessionID)
763 cancel()
764 }
765
766 // Also check for summarize requests
767 if cancel, ok := a.activeRequests.Take(sessionID + "-summarize"); ok && cancel != nil {
768 slog.Info("Summarize cancellation initiated", "session_id", sessionID)
769 cancel()
770 }
771
772 if a.QueuedPrompts(sessionID) > 0 {
773 slog.Info("Clearing queued prompts", "session_id", sessionID)
774 a.messageQueue.Del(sessionID)
775 }
776}
777
778func (a *sessionAgent) ClearQueue(sessionID string) {
779 if a.QueuedPrompts(sessionID) > 0 {
780 slog.Info("Clearing queued prompts", "session_id", sessionID)
781 a.messageQueue.Del(sessionID)
782 }
783}
784
785func (a *sessionAgent) CancelAll() {
786 if !a.IsBusy() {
787 return
788 }
789 for key := range a.activeRequests.Seq2() {
790 a.Cancel(key) // key is sessionID
791 }
792
793 timeout := time.After(5 * time.Second)
794 for a.IsBusy() {
795 select {
796 case <-timeout:
797 return
798 default:
799 time.Sleep(200 * time.Millisecond)
800 }
801 }
802}
803
804func (a *sessionAgent) IsBusy() bool {
805 var busy bool
806 for cancelFunc := range a.activeRequests.Seq() {
807 if cancelFunc != nil {
808 busy = true
809 break
810 }
811 }
812 return busy
813}
814
815func (a *sessionAgent) IsSessionBusy(sessionID string) bool {
816 _, busy := a.activeRequests.Get(sessionID)
817 return busy
818}
819
820func (a *sessionAgent) QueuedPrompts(sessionID string) int {
821 l, ok := a.messageQueue.Get(sessionID)
822 if !ok {
823 return 0
824 }
825 return len(l)
826}
827
828func (a *sessionAgent) SetModels(large Model, small Model) {
829 a.largeModel = large
830 a.smallModel = small
831}
832
833func (a *sessionAgent) SetTools(tools []fantasy.AgentTool) {
834 a.tools = tools
835}
836
837func (a *sessionAgent) Model() Model {
838 return a.largeModel
839}