fix: Templates update (#485)

* fix: add MaxTokens and Temperature fields to AgentInstance and update related logic

* feat: add MaxTokens and Temperature options to SubagentManager and update tool loop logic

* feat: add default temperature handling and update related tests

* feat: allow temperature 0 and distinguish unset

* fix: format MockLLMProvider struct in subagent_tool_test.go

pkg/agent/instance.go

@@ -21,6 +21,8 @@ type AgentInstance struct {
 	Fallbacks      []string
 	Workspace      string
 	MaxIterations  int
+	MaxTokens      int
+	Temperature    float64
 	ContextWindow  int
 	Provider       providers.LLMProvider
 	Sessions       *session.SessionManager
@@ -76,6 +78,16 @@ func NewAgentInstance(
 		maxIter = 20
 	}
 
+	maxTokens := defaults.MaxTokens
+	if maxTokens == 0 {
+		maxTokens = 8192
+	}
+
+	temperature := 0.7
+	if defaults.Temperature != nil {
+		temperature = *defaults.Temperature
+	}
+
 	// Resolve fallback candidates
 	modelCfg := providers.ModelConfig{
 		Primary:   model,
@@ -90,7 +102,9 @@ func NewAgentInstance(
 		Fallbacks:      fallbacks,
 		Workspace:      workspace,
 		MaxIterations:  maxIter,
-		ContextWindow:  defaults.MaxTokens,
+		MaxTokens:      maxTokens,
+		Temperature:    temperature,
+		ContextWindow:  maxTokens,
 		Provider:       provider,
 		Sessions:       sessionsManager,
 		ContextBuilder: contextBuilder,