lastmile-ai/mcp-agent: An MCP-Native Runtime Implementing Anthropic's 'Building Effective Agents' Patterns

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lastmile-ai/mcp-agent is an MCP-native agent framework that implements every pattern from Anthropic's 'Building Effective Agents' in a composable way and manages the full lifecycle of MCP server connections. For builders standardizing on MCP, it is a batteries-included runtime rather than a from-scratch build.