fix: strip think tags from heartbeat messages and log web search provider

- Strip <think> blocks from force response path (max iterations) in
  runLLMIteration, which was missing StripThinkBlocks
- Add StripThinkBlocks safety net in heartbeat sendResponse to prevent
  LLM reasoning artifacts from leaking to users
- Add ProviderName() to WebSearchTool and log selected search provider
  (brave/perplexity/tavily/duckduckgo) at startup for diagnostics
- Show web search provider in gateway startup console output

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cmd/picoclaw/internal/gateway/helpers.go

@@ -80,6 +80,11 @@ func gatewayCmd(debug bool, orchestration bool, enableStats bool) error {
 	toolsInfo := startupInfo["tools"].(map[string]any)
 	skillsInfo := startupInfo["skills"].(map[string]any)
 	fmt.Printf("  • Tools: %d loaded\n", toolsInfo["count"])
+	if wsProvider, ok := toolsInfo["web_search_provider"].(string); ok {
+		fmt.Printf("  • Web search: %s\n", wsProvider)
+	} else {
+		fmt.Println("  • Web search: disabled")
+	}
 	fmt.Printf("  • Skills: %d/%d available\n",
 		skillsInfo["available"],
 		skillsInfo["total"])

pkg/agent/loop.go

@@ -240,6 +240,14 @@ func registerSharedTools(
 			Proxy:                cfg.Tools.Web.Proxy,
 		}); searchTool != nil {
 			agent.Tools.Register(searchTool)
+			logger.InfoCF("agent", "Web search provider registered", map[string]any{
+				"agent_id": agentID,
+				"provider": searchTool.ProviderName(),
+			})
+		} else {
+			logger.WarnCF("agent", "No web search provider configured", map[string]any{
+				"agent_id": agentID,
+			})
 		}
 		agent.Tools.Register(tools.NewWebFetchToolWithProxy(50000, cfg.Tools.Web.Proxy))
 
@@ -2775,7 +2783,7 @@ func (al *AgentLoop) runLLMIteration(
 			"prompt_cache_key": agent.ID,
 		})
 		if forceErr == nil && forceResp.Content != "" {
-			finalContent = forceResp.Content
+			finalContent = utils.StripThinkBlocks(forceResp.Content)
 			if forceResp.Usage != nil && al.stats != nil {
 				al.stats.RecordUsage(
 					forceResp.Usage.PromptTokens,
@@ -2896,10 +2904,17 @@ func (al *AgentLoop) GetStartupInfo() map[string]any {
 
 	// Tools info
 	toolsList := agent.Tools.List()
-	info["tools"] = map[string]any{
+	toolsMap := map[string]any{
 		"count": len(toolsList),
 		"names": toolsList,
 	}
+	// Report web search provider if registered
+	if t, ok := agent.Tools.Get("web_search"); ok {
+		if wst, ok := t.(*tools.WebSearchTool); ok {
+			toolsMap["web_search_provider"] = wst.ProviderName()
+		}
+	}
+	info["tools"] = toolsMap
 
 	// Skills info
 	info["skills"] = agent.ContextBuilder.GetSkillsInfo()

pkg/heartbeat/service.go

@@ -21,6 +21,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/logger"
 	"github.com/sipeed/picoclaw/pkg/state"
 	"github.com/sipeed/picoclaw/pkg/tools"
+	"github.com/sipeed/picoclaw/pkg/utils"
 )
 
 const (
@@ -308,8 +309,11 @@ Add your heartbeat tasks below this line:
 	}
 }
 
-// sendResponse sends the heartbeat response to the last channel
+// sendResponse sends the heartbeat response to the last channel.
+// Think blocks are stripped as a safety net to prevent LLM reasoning
+// artifacts from leaking into user-facing messages.
 func (hs *HeartbeatService) sendResponse(response string) {
+	response = utils.StripThinkBlocks(response)
 	hs.mu.RLock()
 	msgBus := hs.bus
 	hs.mu.RUnlock()

pkg/tools/web.go

@@ -387,8 +387,14 @@ func (p *PerplexitySearchProvider) Search(ctx context.Context, query string, cou
 }
 
 type WebSearchTool struct {
-	provider   SearchProvider
+	provider     SearchProvider
-	maxResults int
+	providerName string
+	maxResults   int
+}
+
+// ProviderName returns the name of the active search provider (e.g. "brave", "perplexity").
+func (t *WebSearchTool) ProviderName() string {
+	return t.providerName
 }
 
 type WebSearchToolOptions struct {
@@ -409,16 +415,19 @@ type WebSearchToolOptions struct {
 
 func NewWebSearchTool(opts WebSearchToolOptions) *WebSearchTool {
 	var provider SearchProvider
+	var providerName string
 	maxResults := 5
 
 	// Priority: Perplexity > Brave > Tavily > DuckDuckGo
 	if opts.PerplexityEnabled && opts.PerplexityAPIKey != "" {
 		provider = &PerplexitySearchProvider{apiKey: opts.PerplexityAPIKey, proxy: opts.Proxy}
+		providerName = "perplexity"
 		if opts.PerplexityMaxResults > 0 {
 			maxResults = opts.PerplexityMaxResults
 		}
 	} else if opts.BraveEnabled && opts.BraveAPIKey != "" {
 		provider = &BraveSearchProvider{apiKey: opts.BraveAPIKey, proxy: opts.Proxy}
+		providerName = "brave"
 		if opts.BraveMaxResults > 0 {
 			maxResults = opts.BraveMaxResults
 		}
@@ -428,11 +437,13 @@ func NewWebSearchTool(opts WebSearchToolOptions) *WebSearchTool {
 			baseURL: opts.TavilyBaseURL,
 			proxy:   opts.Proxy,
 		}
+		providerName = "tavily"
 		if opts.TavilyMaxResults > 0 {
 			maxResults = opts.TavilyMaxResults
 		}
 	} else if opts.DuckDuckGoEnabled {
 		provider = &DuckDuckGoSearchProvider{proxy: opts.Proxy}
+		providerName = "duckduckgo"
 		if opts.DuckDuckGoMaxResults > 0 {
 			maxResults = opts.DuckDuckGoMaxResults
 		}
@@ -441,8 +452,9 @@ func NewWebSearchTool(opts WebSearchToolOptions) *WebSearchTool {
 	}
 
 	return &WebSearchTool{
-		provider:   provider,
+		provider:     provider,
-		maxResults: maxResults,
+		providerName: providerName,
+		maxResults:   maxResults,
 	}
 }