templates

type Message struct {
	Role    string `yaml:"role"`    // "user", "assistant", or "system"
	Content string `yaml:"content"` // Message text
}

type Template struct {
	Name            string    `yaml:"name"`                       // Template name
	Description     string    `yaml:"description"`                // Human-readable description
	SystemPrompt    string    `yaml:"system_prompt,omitempty"`    // System prompt to use
	InitialMessages []Message `yaml:"initial_messages,omitempty"` // Pre-populated messages
	ToolsEnabled    []string  `yaml:"tools_enabled,omitempty"`    // Tools to enable (empty = all)
	Model           string    `yaml:"model,omitempty"`            // Preferred model
	MaxTokens       int       `yaml:"max_tokens,omitempty"`       // Max tokens for responses
	CreatedAt       time.Time `yaml:"-"`                          // When template was created (not in YAML)
}

type ValidationError struct {
	Field   string
	Message string
}