feat: allow temperature 0 and distinguish unset

pkg/agent/instance.go

@@ -83,9 +83,9 @@ func NewAgentInstance(
 		maxTokens = 8192
 	}
 
-	temperature := defaults.Temperature
+	temperature := 0.7
-	if temperature == 0 {
+	if defaults.Temperature != nil {
-		temperature = 0.7
+		temperature = *defaults.Temperature
 	}
 
 	// Resolve fallback candidates

pkg/agent/instance_test.go

@@ -20,12 +20,14 @@ func TestNewAgentInstance_UsesDefaultsTemperatureAndMaxTokens(t *testing.T) {
 				Workspace:         tmpDir,
 				Model:             "test-model",
 				MaxTokens:         1234,
-				Temperature:       1.0,
 				MaxToolIterations: 5,
 			},
 		},
 	}
 
+	configuredTemp := 1.0
+	cfg.Agents.Defaults.Temperature = &configuredTemp
+
 	provider := &mockProvider{}
 	agent := NewAgentInstance(nil, &cfg.Agents.Defaults, cfg, provider)
 
@@ -50,7 +52,35 @@ func TestNewAgentInstance_DefaultsTemperatureWhenZero(t *testing.T) {
 				Workspace:         tmpDir,
 				Model:             "test-model",
 				MaxTokens:         1234,
-				Temperature:       0,
+				MaxToolIterations: 5,
+			},
+		},
+	}
+
+	configuredTemp := 0.0
+	cfg.Agents.Defaults.Temperature = &configuredTemp
+
+	provider := &mockProvider{}
+	agent := NewAgentInstance(nil, &cfg.Agents.Defaults, cfg, provider)
+
+	if agent.Temperature != 0.0 {
+		t.Fatalf("Temperature = %f, want %f", agent.Temperature, 0.0)
+	}
+}
+
+func TestNewAgentInstance_DefaultsTemperatureWhenUnset(t *testing.T) {
+	tmpDir, err := os.MkdirTemp("", "agent-instance-test-*")
+	if err != nil {
+		t.Fatalf("Failed to create temp dir: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	cfg := &config.Config{
+		Agents: config.AgentsConfig{
+			Defaults: config.AgentDefaults{
+				Workspace:         tmpDir,
+				Model:             "test-model",
+				MaxTokens:         1234,
 				MaxToolIterations: 5,
 			},
 		},

pkg/config/config.go

@@ -147,7 +147,7 @@ type AgentDefaults struct {
 	ImageModel          string   `json:"image_model,omitempty" env:"PICOCLAW_AGENTS_DEFAULTS_IMAGE_MODEL"`
 	ImageModelFallbacks []string `json:"image_model_fallbacks,omitempty"`
 	MaxTokens           int      `json:"max_tokens" env:"PICOCLAW_AGENTS_DEFAULTS_MAX_TOKENS"`
-	Temperature         float64  `json:"temperature" env:"PICOCLAW_AGENTS_DEFAULTS_TEMPERATURE"`
+	Temperature         *float64 `json:"temperature,omitempty" env:"PICOCLAW_AGENTS_DEFAULTS_TEMPERATURE"`
 	MaxToolIterations   int      `json:"max_tool_iterations" env:"PICOCLAW_AGENTS_DEFAULTS_MAX_TOOL_ITERATIONS"`
 }
 
@@ -330,7 +330,6 @@ func DefaultConfig() *Config {
 				Provider:            "",
 				Model:               "glm-4.7",
 				MaxTokens:           8192,
-				Temperature:         0.7,
 				MaxToolIterations:   20,
 			},
 		},

pkg/config/config_test.go

@@ -237,8 +237,8 @@ func TestDefaultConfig_MaxToolIterations(t *testing.T) {
 func TestDefaultConfig_Temperature(t *testing.T) {
 	cfg := DefaultConfig()
 
-	if cfg.Agents.Defaults.Temperature == 0 {
+	if cfg.Agents.Defaults.Temperature != nil {
-		t.Error("Temperature should not be zero")
+		t.Error("Temperature should be nil when not provided")
 	}
 }
 
@@ -334,8 +334,8 @@ func TestConfig_Complete(t *testing.T) {
 	if cfg.Agents.Defaults.Model == "" {
 		t.Error("Model should not be empty")
 	}
-	if cfg.Agents.Defaults.Temperature == 0 {
+	if cfg.Agents.Defaults.Temperature != nil {
-		t.Error("Temperature should have default value")
+		t.Error("Temperature should be nil when not provided")
 	}
 	if cfg.Agents.Defaults.MaxTokens == 0 {
 		t.Error("MaxTokens should not be zero")

pkg/migrate/config.go

@@ -76,7 +76,7 @@ func ConvertConfig(data map[string]interface{}) (*config.Config, []string, error
 				cfg.Agents.Defaults.MaxTokens = int(v)
 			}
 			if v, ok := getFloat(defaults, "temperature"); ok {
-				cfg.Agents.Defaults.Temperature = v
+				cfg.Agents.Defaults.Temperature = &v
 			}
 			if v, ok := getFloat(defaults, "max_tool_iterations"); ok {
 				cfg.Agents.Defaults.MaxToolIterations = int(v)

pkg/migrate/migrate_test.go

@@ -275,8 +275,11 @@ func TestConvertConfig(t *testing.T) {
 		if cfg.Agents.Defaults.MaxTokens != 4096 {
 			t.Errorf("MaxTokens = %d, want %d", cfg.Agents.Defaults.MaxTokens, 4096)
 		}
-		if cfg.Agents.Defaults.Temperature != 0.5 {
+		if cfg.Agents.Defaults.Temperature == nil {
-			t.Errorf("Temperature = %f, want %f", cfg.Agents.Defaults.Temperature, 0.5)
+			t.Fatalf("Temperature is nil, want %f", 0.5)
+		}
+		if *cfg.Agents.Defaults.Temperature != 0.5 {
+			t.Errorf("Temperature = %f, want %f", *cfg.Agents.Defaults.Temperature, 0.5)
 		}
 		if cfg.Agents.Defaults.Workspace != "~/.picoclaw/workspace" {
 			t.Errorf("Workspace = %q, want %q", cfg.Agents.Defaults.Workspace, "~/.picoclaw/workspace")