Optimize prompts

README.md

@@ -52,6 +52,21 @@ A scalable, multi-bot solution for Telegram using Go, GORM, and the Anthropic AP
    go build -o telegram-bot
    ```
 
+## Trying Out New Behavior Safely
+
+Want to experiment with a different personality, tone, or set of instructions without disturbing the bot your users already talk to? Run a second, separate bot just for testing.
+
+Each bot profile is its own config file with its own Telegram token, and bots are fully independent — separate identity, separate chat history, separate settings. So a "test twin" is quick to set up:
+
+1. Create a new bot with [@BotFather](https://t.me/BotFather) and copy its token.
+2. Copy your existing config to a new file, e.g. `cp config/mybot.json config/mybot-test.json`.
+3. In the new file, paste the new token, give it a different `id`, and edit `system_prompts` to try your changes.
+4. Start it alongside your main bot. Chat with the test bot, tweak its prompt, and restart the test bot to try again — your real users never see the experiments.
+5. Happy with the result? Copy the same change into your main bot's config and restart it.
+
+> [!NOTE]
+> A test bot always needs its **own** token. Telegram only lets one running bot listen on a given token, so you can't point a second copy at your live bot — give the twin its own @BotFather bot instead.
+
 ## Systemd Unit Setup
 
 To enable the bot to start automatically on system boot and run in the background, set up a systemd unit.

album_buffer.go

@@ -27,7 +27,6 @@ type pendingAlbum struct {
 	username, firstName, lastName, languageCode string
 	isPremium                                   bool
 	messageTime                                 int
-	isNewChat, isOwner                          bool
 	businessConnectionID                        string
 	// timer flushes the album after albumFlushWindow with no further arrivals.
 	// Each new arrival stops the previous timer (best-effort) and installs a
@@ -47,7 +46,6 @@ func (b *Bot) bufferAlbumItem(
 	isPremium bool,
 	languageCode string,
 	messageTime int,
-	isNewChat, isOwner bool,
 	businessConnectionID string,
 ) {
 	b.albumBuffersMu.Lock()
@@ -64,8 +62,6 @@ func (b *Bot) bufferAlbumItem(
 			isPremium:            isPremium,
 			languageCode:         languageCode,
 			messageTime:          messageTime,
-			isNewChat:            isNewChat,
-			isOwner:              isOwner,
 			businessConnectionID: businessConnectionID,
 		}
 		b.albumBuffers[msg.MediaGroupID] = album
@@ -116,7 +112,6 @@ func (b *Bot) flushAlbum(ctx context.Context, mediaGroupID string) {
 		captured.chatID, captured.userID,
 		captured.username, captured.firstName, captured.lastName,
 		captured.isPremium, captured.languageCode, captured.messageTime,
-		captured.isNewChat, captured.isOwner,
 		captured.businessConnectionID,
 	)
 }

anthropic.go

@@ -34,75 +34,20 @@ const maxFileNotFoundRetries = 3
 // "File not found:" for a referenced file_id, the dead file_id is stripped
 // from this chat's in-memory ChatMemory and the corresponding DB rows are
 // stamped FilesCleanedAt so a reconciliation job can finish the cleanup.
-func (b *Bot) getAnthropicResponse(ctx context.Context, chatID int64, messages []anthropic.BetaMessageParam, isNewChat, isOwner, isEmojiOnly bool, username string, firstName string, lastName string, isPremium bool, languageCode string, messageTime int, onSegment func(string) error) (string, error) {
-	// Use prompts from config
-	var systemMessage string
-	if isNewChat {
-		systemMessage = b.config.SystemPrompts["new_chat"]
-	} else {
-		systemMessage = b.config.SystemPrompts["continue_conversation"]
-	}
-
-	// Combine default prompt with custom instructions
-	systemMessage = b.config.SystemPrompts["default"] + " " + b.config.SystemPrompts["custom_instructions"] + " " + systemMessage
-
-	// Handle username placeholder
-	usernameValue := username
-	if username == "" {
-		usernameValue = "unknown" // Use "unknown" when username is not available
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{username}", usernameValue)
-
-	// Handle firstname placeholder
-	firstnameValue := firstName
-	if firstName == "" {
-		firstnameValue = "unknown" // Use "unknown" when first name is not available
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{firstname}", firstnameValue)
-
-	// Handle lastname placeholder
-	lastnameValue := lastName
-	if lastName == "" {
-		lastnameValue = "" // Empty string when last name is not available
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{lastname}", lastnameValue)
-
-	// Handle language code placeholder
-	langValue := languageCode
-	if languageCode == "" {
-		langValue = "en" // Default to English when language code is not available
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{language}", langValue)
-
-	// Handle premium status
-	premiumStatus := "regular user"
-	if isPremium {
-		premiumStatus = "premium user"
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{premium_status}", premiumStatus)
-
-	// Handle time awareness
-	timeObj := time.Unix(int64(messageTime), 0)
-	hour := timeObj.Hour()
-	var timeContext string
-	if hour >= 5 && hour < 12 {
-		timeContext = "morning"
-	} else if hour >= 12 && hour < 18 {
-		timeContext = "afternoon"
-	} else if hour >= 18 && hour < 22 {
-		timeContext = "evening"
-	} else {
-		timeContext = "night"
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{time_context}", timeContext)
-
-	if !isOwner {
-		systemMessage += " " + b.config.SystemPrompts["avoid_sensitive"]
-	}
-
-	if isEmojiOnly {
-		systemMessage += " " + b.config.SystemPrompts["respond_with_emojis"]
-	}
+func (b *Bot) getAnthropicResponse(ctx context.Context, chatID int64, messages []anthropic.BetaMessageParam, isEmojiOnly bool, username string, firstName string, lastName string, isPremium bool, languageCode string, messageTime int, onSegment func(string) error) (string, error) {
+	// The system prompt is the single authored behavior driver. It is assembled
+	// as a cached static block (custom_instructions) followed by a per-turn
+	// dynamic tail. Prompt caching keys on a byte-identical prefix, so the static
+	// block must not contain anything that changes between requests — all
+	// per-turn data (who we're talking to, the time of day, the emoji-only rule)
+	// lives in the trailing block, AFTER the cache breakpoint.
+	//
+	// An empty custom_instructions means no system prompt at all: the System
+	// field is omitted entirely (not sent as a blank block), giving the model's
+	// unmodified "vanilla" behavior. This matters because the Anthropic API
+	// rejects a system array containing an empty/whitespace-only text block, so
+	// omission is the only correct way to express "no system prompt".
+	staticPrompt := strings.TrimSpace(b.config.SystemPrompts["custom_instructions"])
 
 	// Debug logging
 	InfoLogger.Printf("Sending %d messages to Anthropic", len(messages))
@@ -111,12 +56,32 @@ func (b *Bot) getAnthropicResponse(ctx context.Context, chatID int64, messages [
 		Model:     b.config.Model,
 		MaxTokens: 1000,
 		Messages:  messages,
-		System:    []anthropic.BetaTextBlockParam{{Text: systemMessage}},
 		// Files API beta is always on: replayed conversation history may carry
 		// image content blocks that reference file_ids uploaded on prior turns.
 		Betas: []anthropic.AnthropicBeta{anthropic.AnthropicBetaFilesAPI2025_04_14},
 	}
 
+	if staticPrompt != "" {
+		// Block 1 — static persona/instructions, marked for caching. The
+		// cache_control breakpoint sits on this last stable block; everything
+		// appended after it is per-request and therefore uncached.
+		blocks := []anthropic.BetaTextBlockParam{
+			{Text: staticPrompt, CacheControl: anthropic.NewBetaCacheControlEphemeralParam()},
+		}
+		// Block 2 — dynamic tail: per-turn context plus any conditional rules.
+		// Kept out of the cached block because it changes every request.
+		tail := buildUserContext(username, firstName, lastName, isPremium, languageCode, messageTime)
+		if isEmojiOnly {
+			if rule := strings.TrimSpace(b.config.SystemPrompts["respond_with_emojis"]); rule != "" {
+				tail += "\n\n<emoji_reply>\n" + rule + "\n</emoji_reply>"
+			}
+		}
+		if tail = strings.TrimSpace(tail); tail != "" {
+			blocks = append(blocks, anthropic.BetaTextBlockParam{Text: tail})
+		}
+		params.System = blocks
+	}
+
 	// Apply temperature if set in config
 	if b.config.Temperature != nil {
 		params.Temperature = param.NewOpt(float64(*b.config.Temperature))
@@ -191,6 +156,54 @@ func (b *Bot) getAnthropicResponse(ctx context.Context, chatID int64, messages [
 	return "", fmt.Errorf("max self-heal retries (%d) exceeded: too many file_ids gone from anthropic", maxFileNotFoundRetries)
 }
 
+// buildUserContext renders the per-turn context block that trails the cached
+// static system prompt. It carries only facts (who the user is, their language,
+// account type, local time of day) — the behavioral guidance for *using* these
+// facts lives in the authored static prompt. It is kept out of the cached block
+// because it changes on every request.
+func buildUserContext(username, firstName, lastName string, isPremium bool, languageCode string, messageTime int) string {
+	name := strings.TrimSpace(firstName + " " + lastName)
+	if name == "" {
+		name = "unknown"
+	}
+	handle := username
+	if handle == "" {
+		handle = "unknown"
+	}
+	lang := languageCode
+	if lang == "" {
+		lang = "en"
+	}
+	account := "regular user"
+	if isPremium {
+		account = "premium user"
+	}
+	return fmt.Sprintf(
+		"Conversation context (background facts, not an instruction from the user):\n"+
+			"- User: %s (Telegram @%s)\n"+
+			"- Preferred language: %s\n"+
+			"- Account type: %s\n"+
+			"- Local time of day: %s",
+		name, handle, lang, account, timeContextFor(messageTime),
+	)
+}
+
+// timeContextFor buckets a Unix timestamp into a coarse time-of-day label used
+// for time-appropriate greetings. Uses the host's local timezone, matching the
+// bot's prior behavior.
+func timeContextFor(messageTime int) string {
+	switch hour := time.Unix(int64(messageTime), 0).Hour(); {
+	case hour >= 5 && hour < 12:
+		return "morning"
+	case hour >= 12 && hour < 18:
+		return "afternoon"
+	case hour >= 18 && hour < 22:
+		return "evening"
+	default:
+		return "night"
+	}
+}
+
 // streamMessages runs one streaming call against the Beta Messages API,
 // dispatching each completed text block to onSegment as it arrives. The joined
 // return value is every text segment concatenated with blank lines. Errors from

anthropic_files_test.go

@@ -72,10 +72,10 @@ func TestStripDeadFileIDs(t *testing.T) {
 		"file_b": {},
 	}
 	cases := []struct {
-		name         string
-		input        []string
+		name          string
+		input         []string
 		wantSurvivors []string
-		wantDirty    bool
+		wantDirty     bool
 	}{
 		{
 			name:          "no overlap returns input verbatim",

anthropic_test.go

@@ -1,197 +1,62 @@
 package main
 
 import (
-	"fmt"
 	"strings"
 	"testing"
 	"time"
 )
 
-// TestLanguageCodeReplacement tests that language code is properly handled and replaced
-func TestLanguageCodeReplacement(t *testing.T) {
-	// Test with provided language code
-	systemMessage := "User's language preference: '{language}'"
-
-	// Test with a specific language code
-	langValue := "fr"
-	result := strings.ReplaceAll(systemMessage, "{language}", langValue)
-
-	if !strings.Contains(result, "User's language preference: 'fr'") {
-		t.Errorf("Expected language code 'fr' to be replaced, got: %s", result)
-	}
-
-	// Test with empty language code (should default to "en")
-	langValue = ""
-	if langValue == "" {
-		langValue = "en" // Default to English when language code is not available
-	}
-	result = strings.ReplaceAll(systemMessage, "{language}", langValue)
-
-	if !strings.Contains(result, "User's language preference: 'en'") {
-		t.Errorf("Expected default language code 'en' to be used, got: %s", result)
-	}
-}
-
-// TestPremiumStatusReplacement tests that premium status is properly handled and replaced
-func TestPremiumStatusReplacement(t *testing.T) {
-	systemMessage := "User is a {premium_status}"
-
-	// Test with premium user
-	isPremium := true
-	premiumStatus := "regular user"
-	if isPremium {
-		premiumStatus = "premium user"
-	}
-	result := strings.ReplaceAll(systemMessage, "{premium_status}", premiumStatus)
-
-	if !strings.Contains(result, "User is a premium user") {
-		t.Errorf("Expected premium status to be replaced with 'premium user', got: %s", result)
-	}
-
-	// Test with regular user
-	isPremium = false
-	premiumStatus = "regular user"
-	if isPremium {
-		premiumStatus = "premium user"
-	}
-	result = strings.ReplaceAll(systemMessage, "{premium_status}", premiumStatus)
-
-	if !strings.Contains(result, "User is a regular user") {
-		t.Errorf("Expected premium status to be replaced with 'regular user', got: %s", result)
-	}
-}
-
-// TestTimeContextCalculation tests that time context is correctly calculated for different hours
-func TestTimeContextCalculation(t *testing.T) {
-	// Test cases for different hours
-	testCases := []struct {
+// TestTimeContextFor verifies the time-of-day bucketing used for greetings.
+func TestTimeContextFor(t *testing.T) {
+	cases := []struct {
 		hour     int
 		expected string
 	}{
-		{3, "night"},      // Night: hours < 5 or hours >= 22
-		{5, "morning"},    // Morning: 5 <= hours < 12
-		{12, "afternoon"}, // Afternoon: 12 <= hours < 18
-		{17, "afternoon"}, // Afternoon: 12 <= hours < 18
-		{18, "evening"},   // Evening: 18 <= hours < 22
-		{21, "evening"},   // Evening: 18 <= hours < 22
-		{22, "night"},     // Night: hours < 5 or hours >= 22
-		{23, "night"},     // Night: hours < 5 or hours >= 22
+		{3, "night"},      // hours < 5
+		{5, "morning"},    // 5 <= h < 12
+		{11, "morning"},   //
+		{12, "afternoon"}, // 12 <= h < 18
+		{17, "afternoon"}, //
+		{18, "evening"},   // 18 <= h < 22
+		{21, "evening"},   //
+		{22, "night"},     // h >= 22
+		{23, "night"},     //
 	}
-
-	for _, tc := range testCases {
-		t.Run(fmt.Sprintf("Hour_%d", tc.hour), func(t *testing.T) {
-			// Create a timestamp for the specified hour
-			testTime := time.Date(2025, 5, 15, tc.hour, 0, 0, 0, time.UTC)
-
-			// Get the hour directly from the test time to ensure it's what we expect
-			actualHour := testTime.Hour()
-			if actualHour != tc.hour {
-				t.Fatalf("Test setup error: expected hour %d, got %d", tc.hour, actualHour)
-			}
-
-			// Calculate time context using the same logic as in anthropic.go
-			var timeContext string
-			if actualHour >= 5 && actualHour < 12 {
-				timeContext = "morning"
-			} else if actualHour >= 12 && actualHour < 18 {
-				timeContext = "afternoon"
-			} else if actualHour >= 18 && actualHour < 22 {
-				timeContext = "evening"
-			} else {
-				timeContext = "night"
-			}
-
-			// Check if the calculated time context matches the expected value
-			if timeContext != tc.expected {
-				t.Errorf("For hour %d: expected time context '%s', got '%s'",
-					actualHour, tc.expected, timeContext)
-			}
-		})
+	for _, tc := range cases {
+		// Build the timestamp in the host's local zone so timeContextFor (which
+		// reads local time) observes exactly tc.hour regardless of the test
+		// machine's timezone.
+		ts := int(time.Date(2025, 5, 15, tc.hour, 0, 0, 0, time.Local).Unix())
+		if got := timeContextFor(ts); got != tc.expected {
+			t.Errorf("timeContextFor(hour=%d) = %q, want %q", tc.hour, got, tc.expected)
+		}
 	}
 }
 
-// TestSystemMessagePlaceholderReplacement tests that all placeholders are correctly replaced
-func TestSystemMessagePlaceholderReplacement(t *testing.T) {
-	systemMessage := "The user you're talking to has username '{username}' and display name '{firstname} {lastname}'.\n" +
-		"User's language preference: '{language}'\n" +
-		"User is a {premium_status}\n" +
-		"It's currently {time_context} in your timezone"
+// TestBuildUserContext verifies the per-turn context block reflects the user's
+// details and applies the documented fallbacks.
+func TestBuildUserContext(t *testing.T) {
+	noon := int(time.Date(2025, 5, 15, 12, 0, 0, 0, time.Local).Unix())
 
-	// Set up test data
-	username := "testuser"
-	firstName := "Test"
-	lastName := "User"
-	isPremium := true
-	languageCode := "de"
+	// Fully-populated premium user.
+	got := buildUserContext("alice", "Alice", "Smith", true, "de", noon)
+	for _, want := range []string{"Alice Smith", "@alice", "Preferred language: de", "premium user", "afternoon"} {
+		if !strings.Contains(got, want) {
+			t.Errorf("buildUserContext premium: missing %q in:\n%s", want, got)
+		}
+	}
 
-	// Create a timestamp for a specific hour (e.g., 14:00 = afternoon)
-	testTime := time.Date(2025, 5, 15, 14, 0, 0, 0, time.UTC)
-	messageTime := int(testTime.Unix())
+	// Missing name/username/language fall back; non-premium reads "regular user".
+	got = buildUserContext("", "", "", false, "", noon)
+	for _, want := range []string{"User: unknown (Telegram @unknown)", "Preferred language: en", "regular user"} {
+		if !strings.Contains(got, want) {
+			t.Errorf("buildUserContext fallback: missing %q in:\n%s", want, got)
+		}
+	}
 
-	// Handle username placeholder
-	usernameValue := username
-	if username == "" {
-		usernameValue = "unknown"
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{username}", usernameValue)
-
-	// Handle firstname placeholder
-	firstnameValue := firstName
-	if firstName == "" {
-		firstnameValue = "unknown"
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{firstname}", firstnameValue)
-
-	// Handle lastname placeholder
-	lastnameValue := lastName
-	if lastName == "" {
-		lastnameValue = ""
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{lastname}", lastnameValue)
-
-	// Handle language code placeholder
-	langValue := languageCode
-	if languageCode == "" {
-		langValue = "en"
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{language}", langValue)
-
-	// Handle premium status
-	premiumStatus := "regular user"
-	if isPremium {
-		premiumStatus = "premium user"
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{premium_status}", premiumStatus)
-
-	// Handle time awareness
-	timeObj := time.Unix(int64(messageTime), 0)
-	hour := timeObj.Hour()
-	var timeContext string
-	if hour >= 5 && hour < 12 {
-		timeContext = "morning"
-	} else if hour >= 12 && hour < 18 {
-		timeContext = "afternoon"
-	} else if hour >= 18 && hour < 22 {
-		timeContext = "evening"
-	} else {
-		timeContext = "night"
-	}
-	systemMessage = strings.ReplaceAll(systemMessage, "{time_context}", timeContext)
-
-	// Check that all placeholders were replaced correctly
-	if !strings.Contains(systemMessage, "username 'testuser'") {
-		t.Errorf("Username not replaced correctly, got: %s", systemMessage)
-	}
-	if !strings.Contains(systemMessage, "display name 'Test User'") {
-		t.Errorf("Display name not replaced correctly, got: %s", systemMessage)
-	}
-	if !strings.Contains(systemMessage, "language preference: 'de'") {
-		t.Errorf("Language preference not replaced correctly, got: %s", systemMessage)
-	}
-	if !strings.Contains(systemMessage, "User is a premium user") {
-		t.Errorf("Premium status not replaced correctly, got: %s", systemMessage)
-	}
-	if !strings.Contains(systemMessage, "It's currently afternoon in your timezone") {
-		t.Errorf("Time context not replaced correctly, got: %s", systemMessage)
+	// First name only (no last name) must not leave a trailing space in the name.
+	got = buildUserContext("bob", "Bob", "", false, "en", noon)
+	if !strings.Contains(got, "User: Bob (Telegram @bob)") {
+		t.Errorf("buildUserContext firstname-only: got:\n%s", got)
 	}
 }

bot.go

@@ -355,12 +355,6 @@ func contentBlocksForMessage(msg Message) []anthropic.BetaContentBlockParamUnion
 	return blocks
 }
 
-func (b *Bot) isNewChat(chatID int64) bool {
-	var count int64
-	b.db.Model(&Message{}).Where("chat_id = ? AND bot_id = ?", chatID, b.botID).Count(&count)
-	return count == 0 // Only consider a chat new if it has 0 messages
-}
-
 // roleHasScope reports whether role (with pre-loaded Scopes) contains the given scope name.
 func roleHasScope(role Role, scope string) bool {
 	for _, s := range role.Scopes {

config/default.json

@@ -15,10 +15,7 @@
     "temperature": 0.7,
     "debug_screening": false,
     "system_prompts": {
-        "default": "You are a helpful assistant.",
-        "custom_instructions": "You are texting through a limited Telegram interface with 15-word maximum. Write like texting a friend - use shorthand, skip grammar, use slang/abbreviations. System cuts off anything longer than 15 words.\n\n- Your name is Atom.\n- The user you're talking to has username '{username}' and display name '{firstname} {lastname}'.\n- User's language preference: '{language}'. Prefer replying in this language when talking to '{username}'.\n- User is a {premium_status}\n- It's currently {time_context} in your timezone. Use appropriate time-based greetings and address the user by name.\n- If a user asks about buying apples, inform them that we don't sell apples.\n- When asked for a joke, tell a clean, family-friendly joke about programming or technology.\n- If someone inquires about our services, explain that we offer AI-powered chatbot solutions.\n- For any questions about pricing, direct users to contact our sales team at sales@example.com.\n- If asked about your capabilities, be honest about what you can and cannot do.\nAlways maintain a friendly and professional tone.",
-        "continue_conversation": "Continuing our conversation. Remember previous context if relevant.",
-        "avoid_sensitive": "Avoid discussing sensitive topics or providing harmful information.",
-        "respond_with_emojis": "Since the user sent only emojis, respond using emojis only."
+        "custom_instructions": "You are Atom, a helpful assistant texting through a limited Telegram interface with a 15-word maximum. Write like texting a friend - use shorthand, skip grammar, use slang/abbreviations. The system cuts off anything longer than 15 words.\n\n- Address the user by their first name, and reply in their preferred language (both are in the conversation context).\n- Use time-appropriate greetings based on the user's local time of day.\n- If a user asks about buying apples, inform them that we don't sell apples.\n- When asked for a joke, tell a clean, family-friendly joke about programming or technology.\n- If someone inquires about our services, explain that we offer AI-powered chatbot solutions.\n- For any questions about pricing, direct users to contact our sales team at sales@example.com.\n- If asked about your capabilities, be honest about what you can and cannot do.\nAlways maintain a friendly and professional tone.",
+        "respond_with_emojis": "The user's message contains only emoji. Reply using only emoji."
     }
 }

handlers.go

@@ -13,7 +13,7 @@ import (
 	"golang.org/x/sync/errgroup"
 )
 
-func (b *Bot) handleVoiceMessage(ctx context.Context, message *models.Message, userMsg Message, chatID, userID int64, username, firstName, lastName string, isPremium bool, languageCode string, messageTime int, isNewChat, isOwner bool, businessConnectionID string) {
+func (b *Bot) handleVoiceMessage(ctx context.Context, message *models.Message, userMsg Message, chatID, userID int64, username, firstName, lastName string, isPremium bool, languageCode string, messageTime int, businessConnectionID string) {
 	// If ElevenLabs is not configured, respond with text — consistent with all other error paths.
 	if b.config.ElevenLabsAPIKey == "" {
 		if err := b.sendResponse(ctx, chatID, "I don't understand voice messages.", businessConnectionID); err != nil {
@@ -59,7 +59,7 @@ func (b *Bot) handleVoiceMessage(ctx context.Context, message *models.Message, u
 	// Voice path passes nil for onSegment: tool-call narration across multiple
 	// TTS clips would be jarring, so we accumulate everything and synthesize one
 	// audio clip from the joined text.
-	response, err := b.getAnthropicResponse(ctx, chatID, contextMessages, isNewChat, isOwner, false, username, firstName, lastName, isPremium, languageCode, messageTime, nil)
+	response, err := b.getAnthropicResponse(ctx, chatID, contextMessages, false, username, firstName, lastName, isPremium, languageCode, messageTime, nil)
 	if err != nil {
 		ErrorLogger.Printf("Error getting Anthropic response for voice: %v", err)
 		if err := b.sendResponse(ctx, chatID, b.anthropicErrorResponse(err, userID), businessConnectionID); err != nil {
@@ -125,7 +125,6 @@ func (b *Bot) handlePhotoMessage(
 	isPremium bool,
 	languageCode string,
 	messageTime int,
-	isNewChat, isOwner bool,
 	businessConnectionID string,
 ) {
 	if len(items) == 0 {
@@ -203,7 +202,7 @@ func (b *Bot) handlePhotoMessage(
 	// Phase 3: stream Anthropic's reply, same shape as the text path.
 	contextMessages := b.prepareContextMessages(chatMemory)
 	joined, err := b.getAnthropicResponse(
-		ctx, chatID, contextMessages, isNewChat, isOwner, false,
+		ctx, chatID, contextMessages, false,
 		username, firstName, lastName, isPremium, languageCode, messageTime,
 		func(seg string) error {
 			return b.sendOneSegment(ctx, chatID, seg, businessConnectionID)
@@ -292,9 +291,6 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 	messageTime := message.Date
 	text := message.Text
 
-	// Check if it's a new chat (before storing the message so the flag is accurate).
-	isNewChatFlag := b.isNewChat(chatID)
-
 	// Determine if the user is the owner — needed up-front so the album buffer
 	// can capture it alongside other per-turn metadata.
 	var isOwner bool
@@ -323,7 +319,7 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 	// the flush dispatches to handlePhotoMessage.
 	if message.MediaGroupID != "" && len(message.Photo) > 0 {
 		b.bufferAlbumItem(ctx, message, chatID, userID, username, firstName, lastName,
-			isPremium, languageCode, messageTime, isNewChatFlag, isOwner, businessConnectionID)
+			isPremium, languageCode, messageTime, businessConnectionID)
 		return
 	}
 	if len(message.Photo) > 0 {
@@ -334,7 +330,7 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 		b.handlePhotoMessage(ctx, []*models.Message{message},
 			chatID, userID, username, firstName, lastName,
 			isPremium, languageCode, messageTime,
-			isNewChatFlag, isOwner, businessConnectionID)
+			businessConnectionID)
 		return
 	}
 
@@ -490,7 +486,7 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 	// Check if the message contains a voice note (context is built inside the handler
 	// after the transcript replaces the placeholder, so it must not be built here).
 	if message.Voice != nil {
-		b.handleVoiceMessage(ctx, message, userMsg, chatID, userID, username, firstName, lastName, isPremium, languageCode, messageTime, isNewChatFlag, isOwner, businessConnectionID)
+		b.handleVoiceMessage(ctx, message, userMsg, chatID, userID, username, firstName, lastName, isPremium, languageCode, messageTime, businessConnectionID)
 		return
 	}
 
@@ -518,7 +514,7 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 	// calls (text → pause for tool → text → pause → text), rather than a long
 	// upfront wait followed by all bubbles at once.
 	joined, err := b.getAnthropicResponse(
-		ctx, chatID, contextMessages, isNewChatFlag, isOwner, isEmojiOnly,
+		ctx, chatID, contextMessages, isEmojiOnly,
 		username, firstName, lastName, isPremium, languageCode, messageTime,
 		func(seg string) error {
 			return b.sendOneSegment(ctx, chatID, seg, businessConnectionID)
@@ -578,7 +574,7 @@ func (b *Bot) generateStickerResponse(ctx context.Context, message Message, cont
 		messageTime := int(message.Timestamp.Unix())
 		// Sticker reactions are casual chit-chat; tool use is unusual here, so
 		// pass nil for onSegment and return the joined text for a single bubble.
-		response, err := b.getAnthropicResponse(ctx, message.ChatID, contextMessages, false, false, true, message.Username, "", "", false, "", messageTime, nil)
+		response, err := b.getAnthropicResponse(ctx, message.ChatID, contextMessages, true, message.Username, "", "", false, "", messageTime, nil)
 		if err != nil {
 			return "", err
 		}