The Anthropic API has introduced four new capabilities that enable developers to build more powerful AI agents: a code execution tool, an MCP connector, a Files API, and extended prompt caching. The code execution tool allows Claude Opus 4 to run Python code in a sandboxed environment for data analysis, while the MCP connector connects Claude to external systems without requiring custom infrastructure. The Files API simplifies file uploads and access, and extended prompt caching enables agents to maintain context over extended periods with reduced costs. These new capabilities join existing features like web search and citations as part of a comprehensive toolkit for building AI agents.