Function Calling

Modern LLMs can invoke external functions by outputting structured data instead of free text. What format does the LLM output to trigger a function call? Note: the concept is universal but the API differs. OpenAI uses 'functions' or 'tools' params, Anthropic uses 'tools', Google uses 'function_declarations'. Always check your provider's API reference. Flag format: CONGRESS{[output_format]} Example: CONGRESS{plain_text}