MCP tunnels and self-hosted sandboxes launched for Claude Managed Agents

MCP tunnels is now available as a Research Preview, allowing you to connect to MCP servers in your private network. Self-hosted sandboxes are now available for Claude Managed Agents as an alternative to running tool execution in Anthropic's infrastructure. Claude Managed Agents now support updating an agent's MCP server and tool configurations associated with an active session. Large outputs from agent_toolset and MCP tools exceeding 100K tokens are now automatically spilled to a file in the sandbox, with the model receiving a truncated preview.