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 // Strip leading newline from initial text content. This is is
280 // particularly important in non-interactive mode where leading
281 // newlines are very visible.
282 if len(currentAssistant.Parts) == 0 && strings.HasPrefix(text, "\n") {
283 text = strings.TrimPrefix(text, "\n")
284 }
285
286 currentAssistant.AppendContent(text)
287 return a.messages.Update(genCtx, *currentAssistant)
288 },
289 OnToolInputStart: func(id string, toolName string) error {
290 toolCall := message.ToolCall{
291 ID: id,
292 Name: toolName,
293 ProviderExecuted: false,
294 Finished: false,
295 }
296 currentAssistant.AddToolCall(toolCall)
297 return a.messages.Update(genCtx, *currentAssistant)
298 },
299 OnRetry: func(err *fantasy.APICallError, delay time.Duration) {
300 // TODO: implement
301 },
302 OnToolCall: func(tc fantasy.ToolCallContent) error {
303 toolCall := message.ToolCall{
304 ID: tc.ToolCallID,
305 Name: tc.ToolName,
306 Input: tc.Input,
307 ProviderExecuted: false,
308 Finished: true,
309 }
310 currentAssistant.AddToolCall(toolCall)
311 return a.messages.Update(genCtx, *currentAssistant)
312 },
313 OnToolResult: func(result fantasy.ToolResultContent) error {
314 var resultContent string
315 isError := false
316 switch result.Result.GetType() {
317 case fantasy.ToolResultContentTypeText:
318 r, ok := fantasy.AsToolResultOutputType[fantasy.ToolResultOutputContentText](result.Result)
319 if ok {
320 resultContent = r.Text
321 }
322 case fantasy.ToolResultContentTypeError:
323 r, ok := fantasy.AsToolResultOutputType[fantasy.ToolResultOutputContentError](result.Result)
324 if ok {
325 isError = true
326 resultContent = r.Error.Error()
327 }
328 case fantasy.ToolResultContentTypeMedia:
329 // TODO: handle this message type
330 }
331 toolResult := message.ToolResult{
332 ToolCallID: result.ToolCallID,
333 Name: result.ToolName,
334 Content: resultContent,
335 IsError: isError,
336 Metadata: result.ClientMetadata,
337 }
338 _, createMsgErr := a.messages.Create(genCtx, currentAssistant.SessionID, message.CreateMessageParams{
339 Role: message.Tool,
340 Parts: []message.ContentPart{
341 toolResult,
342 },
343 })
344 if createMsgErr != nil {
345 return createMsgErr
346 }
347 return nil
348 },
349 OnStepFinish: func(stepResult fantasy.StepResult) error {
350 finishReason := message.FinishReasonUnknown
351 switch stepResult.FinishReason {
352 case fantasy.FinishReasonLength:
353 finishReason = message.FinishReasonMaxTokens
354 case fantasy.FinishReasonStop:
355 finishReason = message.FinishReasonEndTurn
356 case fantasy.FinishReasonToolCalls:
357 finishReason = message.FinishReasonToolUse
358 }
359 currentAssistant.AddFinish(finishReason, "", "")
360 a.updateSessionUsage(a.largeModel, ¤tSession, stepResult.Usage, a.openrouterCost(stepResult.ProviderMetadata))
361 sessionLock.Lock()
362 _, sessionErr := a.sessions.Save(genCtx, currentSession)
363 sessionLock.Unlock()
364 if sessionErr != nil {
365 return sessionErr
366 }
367 return a.messages.Update(genCtx, *currentAssistant)
368 },
369 StopWhen: []fantasy.StopCondition{
370 func(_ []fantasy.StepResult) bool {
371 cw := int64(a.largeModel.CatwalkCfg.ContextWindow)
372 tokens := currentSession.CompletionTokens + currentSession.PromptTokens
373 remaining := cw - tokens
374 var threshold int64
375 if cw > 200_000 {
376 threshold = 20_000
377 } else {
378 threshold = int64(float64(cw) * 0.2)
379 }
380 if (remaining <= threshold) && !a.disableAutoSummarize {
381 shouldSummarize = true
382 return true
383 }
384 return false
385 },
386 },
387 })
388
389 a.eventPromptResponded(call.SessionID, time.Since(startTime).Truncate(time.Second))
390
391 if err != nil {
392 isCancelErr := errors.Is(err, context.Canceled)
393 isPermissionErr := errors.Is(err, permission.ErrorPermissionDenied)
394 if currentAssistant == nil {
395 return result, err
396 }
397 // Ensure we finish thinking on error to close the reasoning state
398 currentAssistant.FinishThinking()
399 toolCalls := currentAssistant.ToolCalls()
400 // INFO: we use the parent context here because the genCtx has been cancelled
401 msgs, createErr := a.messages.List(ctx, currentAssistant.SessionID)
402 if createErr != nil {
403 return nil, createErr
404 }
405 for _, tc := range toolCalls {
406 if !tc.Finished {
407 tc.Finished = true
408 tc.Input = "{}"
409 currentAssistant.AddToolCall(tc)
410 updateErr := a.messages.Update(ctx, *currentAssistant)
411 if updateErr != nil {
412 return nil, updateErr
413 }
414 }
415
416 found := false
417 for _, msg := range msgs {
418 if msg.Role == message.Tool {
419 for _, tr := range msg.ToolResults() {
420 if tr.ToolCallID == tc.ID {
421 found = true
422 break
423 }
424 }
425 }
426 if found {
427 break
428 }
429 }
430 if found {
431 continue
432 }
433 content := "There was an error while executing the tool"
434 if isCancelErr {
435 content = "Tool execution canceled by user"
436 } else if isPermissionErr {
437 content = "Permission denied"
438 }
439 toolResult := message.ToolResult{
440 ToolCallID: tc.ID,
441 Name: tc.Name,
442 Content: content,
443 IsError: true,
444 }
445 _, createErr = a.messages.Create(context.Background(), currentAssistant.SessionID, message.CreateMessageParams{
446 Role: message.Tool,
447 Parts: []message.ContentPart{
448 toolResult,
449 },
450 })
451 if createErr != nil {
452 return nil, createErr
453 }
454 }
455 if isCancelErr {
456 currentAssistant.AddFinish(message.FinishReasonCanceled, "Request cancelled", "")
457 } else if isPermissionErr {
458 currentAssistant.AddFinish(message.FinishReasonPermissionDenied, "Permission denied", "")
459 } else {
460 currentAssistant.AddFinish(message.FinishReasonError, "API Error", err.Error())
461 }
462 // INFO: we use the parent context here because the genCtx has been cancelled
463 updateErr := a.messages.Update(ctx, *currentAssistant)
464 if updateErr != nil {
465 return nil, updateErr
466 }
467 return nil, err
468 }
469 wg.Wait()
470
471 if shouldSummarize {
472 a.activeRequests.Del(call.SessionID)
473 if summarizeErr := a.Summarize(genCtx, call.SessionID, call.ProviderOptions); summarizeErr != nil {
474 return nil, summarizeErr
475 }
476 // if the agent was not done...
477 if len(currentAssistant.ToolCalls()) > 0 {
478 existing, ok := a.messageQueue.Get(call.SessionID)
479 if !ok {
480 existing = []SessionAgentCall{}
481 }
482 call.Prompt = fmt.Sprintf("The previous session was interrupted because it got too long, the initial user request was: `%s`", call.Prompt)
483 existing = append(existing, call)
484 a.messageQueue.Set(call.SessionID, existing)
485 }
486 }
487
488 // release active request before processing queued messages
489 a.activeRequests.Del(call.SessionID)
490 cancel()
491
492 queuedMessages, ok := a.messageQueue.Get(call.SessionID)
493 if !ok || len(queuedMessages) == 0 {
494 return result, err
495 }
496 // there are queued messages restart the loop
497 firstQueuedMessage := queuedMessages[0]
498 a.messageQueue.Set(call.SessionID, queuedMessages[1:])
499 return a.Run(ctx, firstQueuedMessage)
500}
501
502func (a *sessionAgent) Summarize(ctx context.Context, sessionID string, opts fantasy.ProviderOptions) error {
503 if a.IsSessionBusy(sessionID) {
504 return ErrSessionBusy
505 }
506
507 currentSession, err := a.sessions.Get(ctx, sessionID)
508 if err != nil {
509 return fmt.Errorf("failed to get session: %w", err)
510 }
511 msgs, err := a.getSessionMessages(ctx, currentSession)
512 if err != nil {
513 return err
514 }
515 if len(msgs) == 0 {
516 // nothing to summarize
517 return nil
518 }
519
520 aiMsgs, _ := a.preparePrompt(msgs)
521
522 genCtx, cancel := context.WithCancel(ctx)
523 a.activeRequests.Set(sessionID, cancel)
524 defer a.activeRequests.Del(sessionID)
525 defer cancel()
526
527 agent := fantasy.NewAgent(a.largeModel.Model,
528 fantasy.WithSystemPrompt(string(summaryPrompt)),
529 )
530 summaryMessage, err := a.messages.Create(ctx, sessionID, message.CreateMessageParams{
531 Role: message.Assistant,
532 Model: a.largeModel.Model.Model(),
533 Provider: a.largeModel.Model.Provider(),
534 IsSummaryMessage: true,
535 })
536 if err != nil {
537 return err
538 }
539
540 resp, err := agent.Stream(genCtx, fantasy.AgentStreamCall{
541 Prompt: "Provide a detailed summary of our conversation above.",
542 Messages: aiMsgs,
543 ProviderOptions: opts,
544 PrepareStep: func(callContext context.Context, options fantasy.PrepareStepFunctionOptions) (_ context.Context, prepared fantasy.PrepareStepResult, err error) {
545 prepared.Messages = options.Messages
546 if a.systemPromptPrefix != "" {
547 prepared.Messages = append([]fantasy.Message{fantasy.NewSystemMessage(a.systemPromptPrefix)}, prepared.Messages...)
548 }
549 return callContext, prepared, nil
550 },
551 OnReasoningDelta: func(id string, text string) error {
552 summaryMessage.AppendReasoningContent(text)
553 return a.messages.Update(genCtx, summaryMessage)
554 },
555 OnReasoningEnd: func(id string, reasoning fantasy.ReasoningContent) error {
556 // handle anthropic signature
557 if anthropicData, ok := reasoning.ProviderMetadata["anthropic"]; ok {
558 if signature, ok := anthropicData.(*anthropic.ReasoningOptionMetadata); ok && signature.Signature != "" {
559 summaryMessage.AppendReasoningSignature(signature.Signature)
560 }
561 }
562 summaryMessage.FinishThinking()
563 return a.messages.Update(genCtx, summaryMessage)
564 },
565 OnTextDelta: func(id, text string) error {
566 summaryMessage.AppendContent(text)
567 return a.messages.Update(genCtx, summaryMessage)
568 },
569 })
570 if err != nil {
571 isCancelErr := errors.Is(err, context.Canceled)
572 if isCancelErr {
573 // User cancelled summarize we need to remove the summary message
574 deleteErr := a.messages.Delete(ctx, summaryMessage.ID)
575 return deleteErr
576 }
577 return err
578 }
579
580 summaryMessage.AddFinish(message.FinishReasonEndTurn, "", "")
581 err = a.messages.Update(genCtx, summaryMessage)
582 if err != nil {
583 return err
584 }
585
586 var openrouterCost *float64
587 for _, step := range resp.Steps {
588 stepCost := a.openrouterCost(step.ProviderMetadata)
589 if stepCost != nil {
590 newCost := *stepCost
591 if openrouterCost != nil {
592 newCost += *openrouterCost
593 }
594 openrouterCost = &newCost
595 }
596 }
597
598 a.updateSessionUsage(a.largeModel, ¤tSession, resp.TotalUsage, openrouterCost)
599
600 // just in case get just the last usage
601 usage := resp.Response.Usage
602 currentSession.SummaryMessageID = summaryMessage.ID
603 currentSession.CompletionTokens = usage.OutputTokens
604 currentSession.PromptTokens = 0
605 _, err = a.sessions.Save(genCtx, currentSession)
606 return err
607}
608
609func (a *sessionAgent) getCacheControlOptions() fantasy.ProviderOptions {
610 if t, _ := strconv.ParseBool(os.Getenv("CRUSH_DISABLE_ANTHROPIC_CACHE")); t {
611 return fantasy.ProviderOptions{}
612 }
613 return fantasy.ProviderOptions{
614 anthropic.Name: &anthropic.ProviderCacheControlOptions{
615 CacheControl: anthropic.CacheControl{Type: "ephemeral"},
616 },
617 bedrock.Name: &anthropic.ProviderCacheControlOptions{
618 CacheControl: anthropic.CacheControl{Type: "ephemeral"},
619 },
620 }
621}
622
623func (a *sessionAgent) createUserMessage(ctx context.Context, call SessionAgentCall) (message.Message, error) {
624 var attachmentParts []message.ContentPart
625 for _, attachment := range call.Attachments {
626 attachmentParts = append(attachmentParts, message.BinaryContent{Path: attachment.FilePath, MIMEType: attachment.MimeType, Data: attachment.Content})
627 }
628 parts := []message.ContentPart{message.TextContent{Text: call.Prompt}}
629 parts = append(parts, attachmentParts...)
630 msg, err := a.messages.Create(ctx, call.SessionID, message.CreateMessageParams{
631 Role: message.User,
632 Parts: parts,
633 })
634 if err != nil {
635 return message.Message{}, fmt.Errorf("failed to create user message: %w", err)
636 }
637 return msg, nil
638}
639
640func (a *sessionAgent) preparePrompt(msgs []message.Message, attachments ...message.Attachment) ([]fantasy.Message, []fantasy.FilePart) {
641 var history []fantasy.Message
642 for _, m := range msgs {
643 if len(m.Parts) == 0 {
644 continue
645 }
646 // Assistant message without content or tool calls (cancelled before it returned anything)
647 if m.Role == message.Assistant && len(m.ToolCalls()) == 0 && m.Content().Text == "" && m.ReasoningContent().String() == "" {
648 continue
649 }
650 history = append(history, m.ToAIMessage()...)
651 }
652
653 var files []fantasy.FilePart
654 for _, attachment := range attachments {
655 files = append(files, fantasy.FilePart{
656 Filename: attachment.FileName,
657 Data: attachment.Content,
658 MediaType: attachment.MimeType,
659 })
660 }
661
662 return history, files
663}
664
665func (a *sessionAgent) getSessionMessages(ctx context.Context, session session.Session) ([]message.Message, error) {
666 msgs, err := a.messages.List(ctx, session.ID)
667 if err != nil {
668 return nil, fmt.Errorf("failed to list messages: %w", err)
669 }
670
671 if session.SummaryMessageID != "" {
672 summaryMsgInex := -1
673 for i, msg := range msgs {
674 if msg.ID == session.SummaryMessageID {
675 summaryMsgInex = i
676 break
677 }
678 }
679 if summaryMsgInex != -1 {
680 msgs = msgs[summaryMsgInex:]
681 msgs[0].Role = message.User
682 }
683 }
684 return msgs, nil
685}
686
687func (a *sessionAgent) generateTitle(ctx context.Context, session *session.Session, prompt string) {
688 if prompt == "" {
689 return
690 }
691
692 var maxOutput int64 = 40
693 if a.smallModel.CatwalkCfg.CanReason {
694 maxOutput = a.smallModel.CatwalkCfg.DefaultMaxTokens
695 }
696
697 agent := fantasy.NewAgent(a.smallModel.Model,
698 fantasy.WithSystemPrompt(string(titlePrompt)+"\n /no_think"),
699 fantasy.WithMaxOutputTokens(maxOutput),
700 )
701
702 resp, err := agent.Stream(ctx, fantasy.AgentStreamCall{
703 Prompt: fmt.Sprintf("Generate a concise title for the following content:\n\n%s\n <think>\n\n</think>", prompt),
704 PrepareStep: func(callContext context.Context, options fantasy.PrepareStepFunctionOptions) (_ context.Context, prepared fantasy.PrepareStepResult, err error) {
705 prepared.Messages = options.Messages
706 if a.systemPromptPrefix != "" {
707 prepared.Messages = append([]fantasy.Message{fantasy.NewSystemMessage(a.systemPromptPrefix)}, prepared.Messages...)
708 }
709 return callContext, prepared, nil
710 },
711 })
712 if err != nil {
713 slog.Error("error generating title", "err", err)
714 return
715 }
716
717 title := resp.Response.Content.Text()
718
719 title = strings.ReplaceAll(title, "\n", " ")
720
721 // remove thinking tags if present
722 if idx := strings.Index(title, "</think>"); idx > 0 {
723 title = title[idx+len("</think>"):]
724 }
725
726 title = strings.TrimSpace(title)
727 if title == "" {
728 slog.Warn("failed to generate title", "warn", "empty title")
729 return
730 }
731
732 session.Title = title
733
734 var openrouterCost *float64
735 for _, step := range resp.Steps {
736 stepCost := a.openrouterCost(step.ProviderMetadata)
737 if stepCost != nil {
738 newCost := *stepCost
739 if openrouterCost != nil {
740 newCost += *openrouterCost
741 }
742 openrouterCost = &newCost
743 }
744 }
745
746 a.updateSessionUsage(a.smallModel, session, resp.TotalUsage, openrouterCost)
747 _, saveErr := a.sessions.Save(ctx, *session)
748 if saveErr != nil {
749 slog.Error("failed to save session title & usage", "error", saveErr)
750 return
751 }
752}
753
754func (a *sessionAgent) openrouterCost(metadata fantasy.ProviderMetadata) *float64 {
755 openrouterMetadata, ok := metadata[openrouter.Name]
756 if !ok {
757 return nil
758 }
759
760 opts, ok := openrouterMetadata.(*openrouter.ProviderMetadata)
761 if !ok {
762 return nil
763 }
764 return &opts.Usage.Cost
765}
766
767func (a *sessionAgent) updateSessionUsage(model Model, session *session.Session, usage fantasy.Usage, overrideCost *float64) {
768 modelConfig := model.CatwalkCfg
769 cost := modelConfig.CostPer1MInCached/1e6*float64(usage.CacheCreationTokens) +
770 modelConfig.CostPer1MOutCached/1e6*float64(usage.CacheReadTokens) +
771 modelConfig.CostPer1MIn/1e6*float64(usage.InputTokens) +
772 modelConfig.CostPer1MOut/1e6*float64(usage.OutputTokens)
773
774 a.eventTokensUsed(session.ID, model, usage, cost)
775
776 if overrideCost != nil {
777 session.Cost += *overrideCost
778 } else {
779 session.Cost += cost
780 }
781
782 session.CompletionTokens = usage.OutputTokens + usage.CacheReadTokens
783 session.PromptTokens = usage.InputTokens + usage.CacheCreationTokens
784}
785
786func (a *sessionAgent) Cancel(sessionID string) {
787 // Cancel regular requests
788 if cancel, ok := a.activeRequests.Take(sessionID); ok && cancel != nil {
789 slog.Info("Request cancellation initiated", "session_id", sessionID)
790 cancel()
791 }
792
793 // Also check for summarize requests
794 if cancel, ok := a.activeRequests.Take(sessionID + "-summarize"); ok && cancel != nil {
795 slog.Info("Summarize cancellation initiated", "session_id", sessionID)
796 cancel()
797 }
798
799 if a.QueuedPrompts(sessionID) > 0 {
800 slog.Info("Clearing queued prompts", "session_id", sessionID)
801 a.messageQueue.Del(sessionID)
802 }
803}
804
805func (a *sessionAgent) ClearQueue(sessionID string) {
806 if a.QueuedPrompts(sessionID) > 0 {
807 slog.Info("Clearing queued prompts", "session_id", sessionID)
808 a.messageQueue.Del(sessionID)
809 }
810}
811
812func (a *sessionAgent) CancelAll() {
813 if !a.IsBusy() {
814 return
815 }
816 for key := range a.activeRequests.Seq2() {
817 a.Cancel(key) // key is sessionID
818 }
819
820 timeout := time.After(5 * time.Second)
821 for a.IsBusy() {
822 select {
823 case <-timeout:
824 return
825 default:
826 time.Sleep(200 * time.Millisecond)
827 }
828 }
829}
830
831func (a *sessionAgent) IsBusy() bool {
832 var busy bool
833 for cancelFunc := range a.activeRequests.Seq() {
834 if cancelFunc != nil {
835 busy = true
836 break
837 }
838 }
839 return busy
840}
841
842func (a *sessionAgent) IsSessionBusy(sessionID string) bool {
843 _, busy := a.activeRequests.Get(sessionID)
844 return busy
845}
846
847func (a *sessionAgent) QueuedPrompts(sessionID string) int {
848 l, ok := a.messageQueue.Get(sessionID)
849 if !ok {
850 return 0
851 }
852 return len(l)
853}
854
855func (a *sessionAgent) SetModels(large Model, small Model) {
856 a.largeModel = large
857 a.smallModel = small
858}
859
860func (a *sessionAgent) SetTools(tools []fantasy.AgentTool) {
861 a.tools = tools
862}
863
864func (a *sessionAgent) Model() Model {
865 return a.largeModel
866}