12 // newTurnLoop returns the loop of agent with its memory, its subagents, and the
13 // WhatsApp link and the schedules of its tools. Its calls go through client,
14 // and notify gets each event. The clock gives the date of a turn.
15 func newTurnLoop(agent *Agent, memory *Memory, subagents *Subagents, whatsapp *WhatsApp, schedules *Schedules, client ChainClient, clock func() time.Time, notify func(Event)) (*TurnLoop, error) {
16 layout, err := loadViewLayout(filepath.Join(agent.dir, viewLayoutFileName))
28 wake: make(chan struct{}, 1),
31 l.runs = &SubagentRuns{
42 running: make(map[string]*SubagentRun),
52 workdir: agent.config.Workdir,
58 // Event tells the clients what the agent does as it happens. Kind is the kind
59 // of a logged message (user, reply, tool, echo, note, work), or one of ready,
60 // busy, idle, error, and subagent, which tells that the subagent Text starts a
61 // run. ID is the ID of a logged message. Source names the client that sent a
62 // user message, such as terminal or telegram, so that each client can show the
63 // messages of the others, or the subagent of a report. Status tells how the run
64 // of a report ended: finished, stopped, or failed.
66 Kind string `json:"kind"`
67 ID int `json:"id,omitempty"`
68 Text string `json:"text,omitempty"`
69 Source string `json:"source,omitempty"`
70 Status string `json:"status,omitempty"`
73 // TurnLoop runs the turns of one agent. A user message goes to the log when it
74 // comes, and it wakes the loop. A turn waits until every message before it is
75 // summarized. Then the turn runs a Chain whose first request holds the prompt,
76 // the tools, and the input of turnInput.
78 // The view goes out as the messages of a ViewLayout, so the first request of a
79 // turn reads the view of the turn before from the prompt cache. User messages
80 // that come during a turn join the next request of its chain after the tool
81 // results, and so do the reports of the subagents. The subagents run until the
83 type TurnLoop struct {
90 clock func() time.Time
96 cancel context.CancelFunc
100 // Submit logs a user message from the client source and wakes the loop. The
101 // message joins the next request: the first one of a new turn, or the next one
102 // of a running turn.
103 func (l *TurnLoop) Submit(source, text string) (Message, error) {
104 message, err := l.record("user", source, text)
106 return Message{}, err
110 l.pending = append(l.pending, message)
114 case l.wake <- struct{}{}:
121 // Report logs the report text of the subagent name as a work message and tells
122 // the clients, with the status of the run. Unless the subagent was stopped, the
123 // report joins the waiting messages and wakes the loop, as a user message of
124 // Submit does. A failed write stops the loop, because the log refuses all
126 func (l *TurnLoop) Report(name, text, status string) {
127 message, err := l.Work(name, text, status)
130 l.fail(fmt.Errorf("%w: %w", errChainLogWrite, err))
131 case status != subagentStopped:
136 // Work logs text as a work message of source, such as the name of a subagent,
137 // and tells the clients, with status. The message starts no turn until it goes
139 func (l *TurnLoop) Work(source, text, status string) (Message, error) {
140 message, err := l.memory.Append("work", text)
142 return Message{}, err
156 // Wake adds the logged messages to the waiting messages and wakes the loop
157 // once, as a user message of Submit does. They join the first request of a new
158 // turn together, or the next request of a running turn after the tool results.
159 func (l *TurnLoop) Wake(messages ...Message) {
160 if len(messages) == 0 {
165 l.pending = append(l.pending, messages...)
169 case l.wake <- struct{}{}:
174 // StopSubagent ends the run of the subagent name and tells if it ran. Its
175 // report is logged, but it starts no turn.
176 func (l *TurnLoop) StopSubagent(name string) (bool, error) {
177 return l.runs.Stop(name)
180 // Interrupt ends the running turn. A running tool is killed, and the turn sends
181 // no further request.
182 func (l *TurnLoop) Interrupt() bool {
184 defer l.mutex.Unlock()
195 // Busy tells if a turn runs.
196 func (l *TurnLoop) Busy() bool {
198 defer l.mutex.Unlock()
200 return l.cancel != nil
203 // Append logs a message and tells the clients. The toolbox logs its calls and
204 // results through it.
205 func (l *TurnLoop) Append(kind, text string) (Message, error) {
206 return l.record(kind, "", text)
209 // Flush makes the log durable.
210 func (l *TurnLoop) Flush(ctx context.Context) error {
211 return l.memory.Flush(ctx)
214 // Run runs a turn each time user messages or reports wait, until ctx ends. It
215 // returns the error of a failed log write, which stops the agent. At its start
216 // it resumes the subagents that a stop of the daemon cut, and at its end it
217 // ends the runs of the subagents and waits for them.
218 func (l *TurnLoop) Run(ctx context.Context) error {
221 err := l.runs.Resume(ctx)
223 return fmt.Errorf("resume subagents: %w", err)
247 // note logs a note and tells the clients. A note starts no turn.
248 func (l *TurnLoop) note(text string) error {
249 _, err := l.record("note", "", text)
254 // record logs a message and tells the clients, with the client source of a user
256 func (l *TurnLoop) record(kind, source, text string) (Message, error) {
257 message, err := l.memory.Append(kind, text)
259 return Message{}, err
272 // waiting tells if user messages or reports wait for a request.
273 func (l *TurnLoop) waiting() bool {
275 defer l.mutex.Unlock()
277 return len(l.pending) > 0
280 // fail stops the loop with err.
281 func (l *TurnLoop) fail(err error) {
283 l.failure = errors.Join(l.failure, err)
287 case l.wake <- struct{}{}:
292 // failed returns the error of a failed write of a report.
293 func (l *TurnLoop) failed() error {
295 defer l.mutex.Unlock()
300 // turn runs one turn. A failed or interrupted model call ends the turn and
301 // tells the clients. The messages of the turn stay in the log and the view, and
302 // the next turn starts only with a new message, so a lasting failure such as a
303 // needed login does not repeat. Only a failed log write is an error of turn.
304 func (l *TurnLoop) turn(ctx context.Context) error {
305 ctx, cancel := context.WithCancel(ctx)
323 if err != nil && !errors.Is(err, errChainLogWrite) {
326 Text: turnError(ctx, err),
339 // chain runs the request chain of a turn until the final answer.
340 func (l *TurnLoop) chain(ctx context.Context) error {
342 if len(messages) == 0 {
346 err := l.memory.Wait(ctx)
351 instructions, err := l.agent.Prompt()
356 skip := make(map[int]bool, len(messages))
357 for _, message := range messages {
358 skip[message.ID] = true
361 view, err := l.layout.Split(l.memory.ViewLines(skip))
369 request: ModelRequest{
370 Model: l.agent.config.Model,
371 Effort: l.agent.config.Effort,
372 Instructions: instructions,
373 Tools: promptTools(),
378 _, err = chain.Run(ctx, turnInput(view, l.state(), messages))
383 // take returns the user messages that wait for a request, and removes them.
384 func (l *TurnLoop) take() []Message {
386 defer l.mutex.Unlock()
388 messages := l.pending
394 // state returns the per-turn state: the end of the view, and the date and time
396 func (l *TurnLoop) state() string {
397 return "</chat>\n\nNow: " + l.clock().Format("Monday 2006-01-02 15:04 -07:00")
400 // turnError returns the text of the error that ended a turn.
401 func turnError(ctx context.Context, err error) string {
402 if ctx.Err() != nil {
409 // turnInput returns the input of the first request of a turn, stable parts
410 // first: a user message for each view message, one with the per-turn state,
411 // and one for each new message, whole. The view leaves out the leaf lines of
413 func turnInput(view []string, state string, messages []Message) []any {
414 input := make([]any, 0, len(view)+1+len(messages))
415 for _, text := range view {
416 input = append(input, modelUserMessage(text))
419 input = append(input, modelUserMessage(state))
420 for _, message := range messages {
421 input = append(input, modelUserMessage(message.Text))